MAX1585ETJ+ ,5-Channel Slim DSC Power SuppliesFeaturesThe MAX1584/MAX1585 provide a complete power-♦ Step-Up DC-DC Converter, 95% Efficient suppl ..
MAX1586 ,High-Efficiency / Low-IQ PMICs with Dynamic Core for PDAs and Smart PhonesFeaturesThe MAX1586/MAX1587 power-management ICs are ♦ Six Regulators in One Package:optimized for ..
MAX1586AETM ,High-Efficiency / Low-IQ PMICs with Dynamic Core for PDAs and Smart Phonesfeatures an additional linear regulatorMAX1587BACKUP(V6) for VCC_USIM and low-battery and dead- bat ..
MAX1586AETM ,High-Efficiency / Low-IQ PMICs with Dynamic Core for PDAs and Smart PhonesELECTRICAL CHARACTERISTICS(V = 3.6V, V = 3.0V, V = 1.1V, V = 1.35V, circuit of Figure 5, T = 0°C to ..
MAX1586AETM+ ,High-Efficiency, Low-IQ PMICs with Dynamic Core for PDAs and SmartphonesMAX1586A/MAX1586B/MAX1586C/MAX1587A/MAX1587C19-3089; Rev 4; 4/09High-Efficiency, Low-I PMICs withQD ..
MAX1586AETM+T ,High-Efficiency, Low-IQ PMICs with Dynamic Core for PDAs and SmartphonesMAX1586A/MAX1586B/MAX1586C/MAX1587A/MAX1587C19-3089; Rev 4; 4/09High-Efficiency, Low-I PMICs withQD ..
MAX4246AKA-T ,Ultra-Small / Rail-to-Rail I/O with Disable / Single-/Dual-Supply / Low-Power Op AmpsELECTRICAL CHARACTERISTICS(V = +2.7V, V = 0, V = 0, V = V /2, R connected from OUT to V /2, SHDN_ = ..
MAX4246AUA ,Ultra-Small / Rail-to-Rail I/O with Disable / Single-/Dual-Supply / Low-Power Op AmpsFeaturesThe MAX4245/MAX4246/MAX4247 family of low-cost Rail-to-Rail Input and Output Voltage Swing ..
MAX4249ESD ,SOT23 / Single-Supply / Low-Noise / Low-Distortion / Rail-to-Rail Op Ampsfeatures make the' Input Common-Mode Voltage Range Includesdevices an ideal choice for portable/bat ..
MAX4250EUK ,SOT23 / Single-Supply / Low-Noise / Low-Distortion / Rail-to-Rail Op Ampsapplications that require low distortion and/or low noise. ' Outputs Swing within 8mV of Rails with ..
MAX4250EUK ,SOT23 / Single-Supply / Low-Noise / Low-Distortion / Rail-to-Rail Op AmpsMAX4249–MAX425719-1295; Rev 2; 4/98SOT23, Single-Supply, Low-Noise,Low-Distortion, Rail-to-Rail Op ..
MAX4250EUK+T ,UCSP, Single-Supply, Low-Noise, Low-Distortion, Rail-to-Rail Op AmpsELECTRICAL CHARACTERISTICS(V = 5V, V = 0V, V = 0V, V = V /2, R connected to V /2, SHDN = V , T = T ..
MAX1585ETJ+
5-Channel Slim DSC Power Supplies
General DescriptionThe MAX1584/MAX1585 provide a complete power-
supply solution for slim digital cameras. They improve
performance, component count, and size compared to
conventional multichannel controllers in 2-cell AA, 1-cell
Li+, and dual-battery designs. On-chip MOSFETs pro-
vide up to 95% efficiency for critical power supplies,
while additional channels operate with external FETs for
optimum design flexibility. This optimizes overall effi-
ciency and cost, while also reducing board space.
The MAX1584/MAX1585 include 5 high-efficiency DC-
DC conversion channels:Step-up DC-DC converter with on-chip FETsStep-down DC-DC converter with on-chip FETs Three PWM DC-DC controllers for CCD, LCD, LED,
or other functions
The step-down DC-DC converter can operate directly
from the battery or from the step-up output, providing
boost-buck capability with a compound efficiency of up
to 90%. Both devices include three PWM DC-DC con-
trollers: the MAX1584 includes two step-up controllers
and one step-down controller, while the MAX1585
includes one step-up controller, one inverting controller,
and one step-down controller. All DC-DC channels
operate at one fixed frequency—settable from 100kHz
to 1MHz—to optimize size, cost, and efficiency. Other
features include soft-start, power-OK outputs, and over-
load protection. The MAX1584/MAX1585 are available
in space-saving, 32-pin thin QFN packages. An evalua-
tion kit is available to expedite designs.
ApplicationsDigital Cameras
PDAs
FeaturesStep-Up DC-DC Converter, 95% Efficient Step-Down DC-DC Converter
Operate from Battery for 95% Efficient
Step-Down
90% Efficient Boost-Buck with Step-UpThree Auxiliary PWM DC-DC ControllersNo Transformers (MAX1585)Up to 1MHz Operating Frequency1mA Shutdown ModeInternal Soft-Start ControlOverload ProtectionCompact 32-Pin Thin QFN Package (5mm x 5mm)
MAX1584/MAX1585
5-Channel Slim DSC Power Supplies
Ordering InformationMAX1585
INPUT
0.7V TO 5.5V
ONSU
ONSD
ON1
ON2
ON3
STEP-UPSYSTEM +5V
STEP-DOWNCORE +1.8V
AUX1LCD, CCD, LED +15V
AUX2CCD -7.5V
AUX3LOGIC +3.3V
ypical Operating Circuit19-2883; Rev 0; 7/03
PART TEMP RANGE PIN-
PACKAGE AUX
FUNCTIONSMAX1584ETJ -40°C to +85°C 32 Thin QFN
5mm x 5mm 2 step-up
1 step-down
MAX1585ETJ -40°C to +85°C 32 Thin QFN
5mm x 5mm1 step-up
1 step-down
1 invertingCC1FB1PGSDLXSDPVSDONSDCCSDFBSD
ON1
ON2
ON3
ONSU
REF
FBSU
CCSU
AUX1OK
FB3
CC3
GND
DL1
DL3
DL2
INDL2CC2FB2PVSULXSUPGSUOSCSCFSDOK
MAX1584
MAX1585
THIN QFN
5mm x 5mm
Pin Configuration
MAX1584/MAX1585
5-Channel Slim DSC Power Supplies
ABSOLUTE MAXIMUM RATINGSStresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
PV, PVSU, PVSD, SDOK, AUX1OK, SCF, ON_, FB_ to
GND..........................................................................-0.3V to +6V
PGND to GND....................................................…-0.3V to +0.3V
INDL2, DL1, DL3 to GND.........................-0.3V to (PVSU + 0.3V)
DL2 to GND............................................-0.3V to (INDL2 + 0.3V)
PV to PVSU...........................................................-0.3V to + 0.3V
LXSU Current (Note 1)..........................................................3.6A
LXSD Current (Note 1)........................................................2.25A
REF, OSC, CC_ to GND...........................-0.3V to (PVSU + 0.3V)
Continuous Power Dissipation (TA= +70°C)
32-Pin Thin QFN (derate 22mW/°C above +70°C)....1700mW
Operating Temperature Range...........................-40°C to +85°C
Junction Temperature......................................................+150°C
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering, 10s).................................+300°C
ELECTRICAL CHARACTERISTICS(VPVSU= VPV= VPVSD= VINDL2= 3.6V, TA
= 0°C to +85°C, unless otherwise noted.)PARAMETER CONDITIONS MIN TYP MAX UNITSGENERALInput Voltage Range (Note 2) 0.7 5.5 VStep-Up Minimum Startup
VoltageILOAD < 1mA, TA = +25°C, startup voltage tempco is
-2300ppm/°C (typ) (Note 3) 0.9 1.1 VShutdown Supply Current into PV PV = 3.6V 0.1 5 µASupply Current into PV with
Step-Up EnabledONSU = 3.6V, FBSU = 1.5V
(does not include switching losses) 300 450 µASupply Current into PV with
Step-Up and Step-Down EnabledONSU = ONSD = 3.6V, FBSU = 1.5V, FBSD = 1.5V
(does not include switching losses) 450 700 µATotal Supply Current from PV and
PVSU with Step-Up and One AUX
EnabledONSU = ON1 = 3.6V, FBSU = 1.5V, FB2 = 1.5V
(does not include switching losses) 400 650 µA
REFERENCEReference Output Voltage IREF = 20µA 1.23 1.25 1.27 VReference Load Regulation 10µA < IREF < 200µA 4.5 10 mVReference Line Regulation 2.7 < PVSU < 5.5V 1.3 5 mV
OSCILLATOROSC Discharge Trip Level Rising edge 1.225 1.25 1.275 VOSC Discharge Resistance OSC = 1.5V, IOSC = 3mA 52 80 ΩOSC Discharge Pulse Width 150 nsOSC Frequency ROSC = 47kΩ, COSC =100pF 500 kHz
STEP-UP DC-DC CONVERTERStep-Up Startup-to-Normal
Operating Threshold Rising edge or falling edge (Note 4) 2.30 2.5 2.65 VStep-Up Startup-to-Normal
Operating Threshold Hysteresis 80 mV
Note 1:LXSU has internal clamp diodes to PVSU and PGND, and LXSD has internal clamp diodes to PVSD and PGND. Applications
that forward bias these diodes should take care not to exceed the device’s power dissipation limits.
MAX1584/MAX1585
5-Channel Slim DSC Power Supplies
ELECTRICAL CHARACTERISTICS (continued)(VPVSU= VPV= VPVSD= VINDL2= 3.6V, TA
= 0°C to +85°C, unless otherwise noted.)PARAMETER CONDITIONS MIN TYP MAX UNITSStep-Up Voltage Adjust Range 3.0 5.5 VStart Delay of ONSD, ON1, ON2,
ON3 after SU in Regulation 1024 OSC
cyclesFBSU Regulation Voltage 1.231 1.25 1.269 VFBSU to CCSU
Transconductance FBSU = CCSU 80 135 185 µSFBSU Input Leakage Current FBSU = 1.25V -100 +1 +100 nAIdle ModeTM Trip Level (Note 6) 150 mACurrent-Sense Amplifier
Transresistance 0.275 V/AStep-Up Maximum Duty Cycle FBSU = 1V 80 85 90 %PVSU Leakage Current VLX = 0V, PVSU = 5.5V 0.1 5 µALXSU Leakage Current VLXSU = VOUT = 5.5V 0.1 5 µAN channel 95 150 Switch On-Resistance P channel 150 250 mΩN-Channel Current Limit 2.4 2.8 3.2 AP-Channel Turn-Off Current 20 mAStartup Current Limit PVSU = 1.8V (Note 5) 450 mAStartup tOFF PVSU = 1.8V 700 nsStartup Frequency PVSU = 1.8V 200 kHz
STEP-DOWN DC-DC CONVERTERStep-Down Output Voltage
Adjust Range PVSD must be greater than output (Note 7) 1.25 5.00 VFBSD Regulation Voltage 1.231 1.25 1.269 VFBSD to CCSD
Transconductance FBSD = CCSD 80 135 185 µSFBSD Input Leakage Current FBSD = 1.25V -100 +0.1 +100 nAIdle Mode Trip Level (Note 6) 100 mACurrent-Sense Amplifier
Transresistance 0.5 V/ALXSD Leakage Current VLXSD = 0 to 3.6V, PVSU = 3.6V 0.1 5 µAN channel 95 150 Switch On-Resistance P channel 150 250 mΩP-Channel Current Limit 0.65 0.8 0.95 AN-Channel Turn-Off Current 20 mASoft-Start Interval 2048 OSC
cyclesSDOK Output Low Voltage 0.1mA into SDOK 0.01 0.1 VSDOK Leakage Current ONSU = GND 0.01 1 µA
Idle Mode is a trademark of Maxim Integrated Products, Inc.
MAX1584/MAX1585
5-Channel Slim DSC Power Supplies
ELECTRICAL CHARACTERISTICS (continued)(VPVSU= VPV= VPVSD= VINDL2= 3.6V, TA
= 0°C to +85°C, unless otherwise noted.)PARAMETER CONDITIONS MIN TYP MAX UNITSAUX1, 2, 3 DC-DC CONTROLLERSMaximum Duty Cycle FB_ = 1V 80 85 90 %FB1 and FB3 Regulation Voltage FB_ = CC_ 1.231 1.25 1.269 VFB2 (MAX1584) Regulation
Voltage FB_ = CC_ 1.231 1.25 1.269 VFB2 (MAX1585) (Inverter)
Regulation Voltage FB_ = CC_ -0.01 0 +0.01 VFB_ to CC_ Transconductance FB_ = CC_ 80 135 185 µSFB_ Input Leakage Current FB_ = 1.25V -100 +1 +100 nADL_ Driver Resistance Output high or low 2.5 10 ΩDL_ Drive Current Sourcing or sinking 0.5 ASoft-Start Interval 4096 OSC
cyclesAUX1OK Output Low Voltage 0.1mA into AUX1OK 0.01 0.1 VAUX1OK Leakage Current ONSU = GND 0.01 1 µA
OVERLOAD AND THERMAL PROTECTIONOverload-Protection Fault Delay 100,000 OSC
cyclesSCF Leakage Current ONSU = PVSU, FBSU = 1.5V 0.1 1 µASCF Output Low Voltage 0.1mA into SCF 0.01 0.1 VThermal Shutdown +160 °CThermal Hysteresis 20 °C
LOGIC INPUTS1.1V < PVSU < 1.8V (ONSU only) 0.2 ON_ Input Low Level 1.8V < PVSU< 5.5V 0.4 V1.1V < PVSU < 1.8V (ONSU only) VPVSU -
0.2 ON_ Input High Level1.8V < PVSU < 5.5V 1.6 VON_ Impedance to GND ON_ = 3.35V 330 kΩ
MAX1584/MAX1585
5-Channel Slim DSC Power SuppliesPARAMETER CONDITIONS MIN MAX UNITSGENERAL Input Voltage Range (Note 2) 0.7 5.5 VShutdown Supply Current
into PVSU PVSU = 3.6V 5 µASupply Current into PV with
Step-Up EnabledONSU = 3.6V, FBSU = 1.5V
(does not include switching losses) 450 µASupply Current into PV with
Step-Up and Step-Down EnabledONSU = ONSD = 3.6V, FBSU = 1.5V, FBSD = 1.5V
(does not include switching losses) 700 µATotal Supply Current from PV and
PVSU with Step-Up and One AUX
EnabledONSU = ON1 = 3.6V, FBSU = 1.5V, FB2 = 1.5V
(does not include switching losses) 650 µA
REFERENCE Reference Output Voltage IREF = 20µA 1.225 1.275 VReference Load Regulation 10µA < IREF < 200µA 10 mVReference Line Regulation 2.7V < PVSU < 5.5V 5 mV
OSCILLATOR OSC Discharge Trip Level Rising edge 1.225 1.275 VOSC Discharge Resistance OSC = 1.5V, IOSC = 3mA 80 Ω
STEP-UP DC-DC CONVERTER Step-Up Startup-to-Normal
Operating Threshold Rising edge or falling edge (Note 4) 2.30 2.65 VStep-Up Voltage Adjust Range 3.0 5.5 VFBSU Regulation Voltage 1.225 1.275 VFBSU to CCSU
Transconductance FBSU = CCSU 80 185 µSFBSU Input Leakage Current FBSU = 1.25V -100 +100 nAStep-Up Maximum Duty Cycle FBSU = 1V 80 90 %PVSU Leakage Current VLX = 0V, PVSU = 5.5V 5 µALXSU Leakage Current VLXSU = VOUT = 5.5V 5 µAN channel 150 Switch On-Resistance P channel 250 mΩN-Channel Current Limit 2.4 3.2 A
STEP-DOWN DC-DC CONVERTER Step-Down Output Voltage Adjust
Range PVSD must be greater than output (Note 7) 1.25 5.00 V
ELECTRICAL CHARACTERISTICS(VPVSU= VPV= VPVSD= VINDL2= 3.6V, TA
= -40°C to +85°C, unless otherwise noted.) (Note 8)
MAX1584/MAX1585
5-Channel Slim DSC Power SuppliesPARAMETER CONDITIONS MIN MAX UNITSFBSD Regulation Voltage 1.225 1.275 VFBSD to CCSD
Transconductance FBSD = CCSD 80 185 µSFBSD Input Leakage Current FBSD = 1.25V -100 +100 nALXSD Leakage Current VLXSD = 0 to 3.6V, PVSU = 3.6V 5 µAN channel 150 Switch On-Resistance P channel 250 mΩP-Channel Current Limit 0.65 0.95 ASDOK Output Low Voltage 0.1mA into SDOK 0.1 VSDOK Leakage Current ONSU = GND 1 µAAUX1, 2, 3 DC-DC CONTROLLERS Maximum Duty Cycle FB_ = 1V 80 90 %FB1 and FB3 Regulation Voltage FB_ = CC_ 1.225 1.275 VFB2 (MAX1584) Regulation
Voltage FB_ = CC_ 1.225 1.275 VFB2 (MAX1585) (Inverter)
Regulation Voltage FB_ = CC_ -0.01 +0.01 VFB_ to CC_ Transconductance FB_ = CC_ 80 185 µSFB_ Input Leakage Current FB_ = 1.25V -100 +100 nADL_ Driver Resistance Output high or low 10 ΩAUX1OK Output Low Voltage 0.1mA into AUX1OK 0.1 VAUX1OK Leakage Current ONSU = GND 1 µAOVERLOAD AND THERMAL PROTECTION SCF Leakage Current ONSU = PVSU, FBSU = 1.5V 1 µASCF Output Low Voltage 0.1mA into SCF 0.1 VLOGIC INPUTS 1.1V < PVSU < 1.8V (ONSU only) 0.2 ON_ Input Low Level 1.8V < PVSU < 5.5V 0.4 V1.1V < PVSU < 1.8V (ONSU only) VPVSU - 0.2 ON_ Input High Level 1.8V < PVSU < 5.5V 1.6 V
ELECTRICAL CHARACTERISTICS (continued)
(VPVSU= VPV= VPVSD= VINDL2= 3.6V, TA= -40°C to +85°C, unless otherwise noted.) (Note 8)
Note 2:The MAX1584/MAX1585 are powered from the step-up output (PVSU). An internal low-voltage startup oscillator drives the
step-up starting at about 0.9V until PVSU reaches approximately 2.5V. When PVSU reaches 2.5V, the main control circuitry
takes over. Once the step-up is up and running, it can maintain operation with very low input voltages; however, output cur-
rent is limited.
Note 3:Since the device is powered from PVSU, a Schottky rectifier, connected from the input battery to PVSU, is required for low-
voltage startup, or if PVSD is connected to VINinstead of PVSU.
Note 4:The step-up regulator is in startup mode until this voltage is reached. Do not apply full load current during startup. A power-
OK output can be used with an external PFET to gate the load until the step-up is in regulation. See the Applications
Informationsection.
MAX1584/MAX1585
5-Channel Slim DSC Power Supplies
STEP-UP EFFICIENCY
vs. LOAD CURRENT
MAX1584/85 toc01
LOAD CURRENT (mA)
EFFICIENCY (%)
VOUT = 5V
VIN = 4.5V
VIN = 4.2V
VIN = 3.8V
VIN = 3.0V
STEP-DOWN EFFICIENCY
vs. LOAD CURRENT
MAX1584/85 toc02
LOAD CURRENT (mA)
EFFICIENCY (%)
VIN = 3.0V
VIN = 3.8V
VIN = 4.2V
VIN = 4.5V
PVSD CONNECTED TO BATTERY
VOUT = 1.5V
DOES NOT INCLUDE CURRENT USED
BY THE STEP-UP TO POWER THE IC
COMBINED BOOST-BUCK
EFFICIENCY vs. LOAD CURRENT
MAX1584/85 toc03
LOAD CURRENT (mA)
EFFICIENCY (%)
VIN = 4.5V
VIN = 4.2V
VIN = 3.8V
VIN = 3.0V
VOUT3 = 3.3V
VOUTSU = 5.0V
EFFICIENCY vs. INPUT VOLTAGE
MAX1584/85 toc04
INPUT VOLTAGE (V)
EFFICIENCY (%)
SU = 5V, 300mA
SD = 1.5V, 250mA
SU + AUX3 = 3.3V, 300mA
AUX1 = 15V, 40mA
AUX2 = -7.5V, 40mA
AUX1 EFFICIENCY vs. LOAD CURRENT
MAX5184/85 toc05
LOAD CURRENT (mA)
EFFICIENCY (%)
VIN = 4.5V
VIN = 4.2V
VIN = 3.8V
VIN = 3.0V
VOUT1 = 15V
MAX1585 AUX2 EFFICIENCY
vs. LOAD CURRENT
MAX5184/85 toc06
LOAD CURRENT (mA)
EFFICIENCY (%)
VIN = 3.0V
VIN = 3.8V
VIN = 4.2V
VIN = 4.5V
VOUT2 = -7.5V
Typical Operating Characteristics
(Circuit of Figure 1, TA= +25°C, unless otherwise noted.)
Note 5:The step-up current limit in startup refers to the LXSU switch current limit, not an output current limit.
Note 6:The idle mode current threshold is the transition point between fixed-frequency PWM operation and idle mode operation
(where switching rate varies with load). The specification is given in terms of inductor current. In terms of output current, the
idle mode transition varies with input-output voltage ratio and inductor value. For the step-up, the transition output current is
approximately 1/3 the inductor current when stepping from 2V to 3.3V. For the step-down, the transition current in terms of
output current is approximately 3/4 the inductor current when stepping down from 3.3V to 1.8V.
Note 7:Operation in dropout (100% duty cycle) can only be maintained for 100,000 OSC cycles before the output is considered
faulted, triggering global shutdown.
Note 8:Specifications to -40°C are guaranteed by design, not production tested.
ELECTRICAL CHARACTERISTICS (continued)
(VPVSU= VPV= VPVSD= VINDL2= 3.6V, TA
= -40°C to +85°C, unless otherwise noted.) (Note 8)
MAX1584/MAX1585
5-Channel Slim DSC Power Supplies
NO-LOAD INPUT CURRENT
vs. INPUT VOLTAGE (SWITCHING)
MAX1584/85 toc07
INPUT VOLTAGE (V)
INPUT CURRENT (mA)
BOOST-BUCK (SU + AUX3)
VSU = 5.0V, OUT3 = 3.33V
VSU = 5.0V
MINIMUM STARTUP VOLTAGE
vs. LOAD CURRENT (VSU)
MAX5184/85 toc08
LOAD CURRENT (mA)
MINIMUM STARTUP VOLTAGE (V)
SCHOTTKY DIODE CONNECTED
FROM IN TO VSU
REFERENCE VOLTAGE
vs. TEMPERATURE
MAX1584/85 toc09
TEMPERATURE (°C)
REFERENCE VOLTAGE (V)50250-25
REFERENCE VOLTAGE
vs. REFERENCE LOAD CURRENTMAX1584/85 toc10
REFERENCE LOAD CURRENT (μA)
REFERENCE VOLTAGE (V)
OSCILLATOR FREQUENCY vs. ROSC
MAX1584/85 toc11
ROSC (kΩ)
OSCILLATOR FREQUENCY (kHz)
COSC = 470pF
COSC = 330pF
COSC = 220pF
COSC = 100pF
COSC = 47pF
SWITCHING FREQUENCY
vs. TEMPERATUREMAX1584/85 toc12
TEMPERATURE (°C)
SWITCHING FREQUENCY (kHz)50250-25
ROSC= 51kΩ
COSC= 100pF
Typical Operating Characteristics (continued)(Circuit of Figure 1, TA= +25°C, unless otherwise noted.)
MAX1584/MAX1585
5-Channel Slim DSC Power Supplies
AUX1 STARTUP RESPONSEMAX1584/85 toc16
2ms/div
ON1
5V/div
OUT1
10V/div
IOUT1
100mA/div
VIN = 3.5V
STEP-UP LOAD-TRANSIENT RESPONSEMAX1584/85 toc17
400μs/div
VOUTSU
AC-COUPLED
500mV/div
IOUT_SU
200mA/div0A
VOUTSU = 5.0V
VIN = 3.5V
STEP-DOWN LOAD-
TRANSIENT RESPONSEMAX1584/85 toc18
400μs/div
VOUTSD
AC-COUPLED
100mV/div
IOUT_SD
100mA/div0A
VIN = 3.5V
VOUT_SD = 1.5V
AUX MAXIMUM DUTY CYCLE
vs. FREQUENCYMAX1584/85 toc13
FREQUENCY (kHz)
MAXIMUM DUTY CYCLE (%)
COSC = 330pF
WHEN THIS DUTY CYCLE IS EXCEEDED
FOR 100,000 CLOCK CYCLES,
THE MAX1584/MAX1585 SHUT DOWN
STEP-UP STARTUP RESPONSEMAX1584/85 toc14
200μs/div
ONSU
5V/div
OUTSU
5V/div
IOUTSU
200mA/div
IIN
1.0A/div
VIN = 3.5V
STEP-DOWN STARTUP RESPONSEMAX1584/85 toc15
4ms/div
ONSD
5V/div
OUTSD
5V/div
IOUTSD
200mA/div
VIN = 3.5V
Typical Operating Characteristics (continued)(Circuit of Figure 1, TA= +25°C, unless otherwise noted.)
MAX1584/MAX1585
5-Channel Slim DSC Power Supplies
Pin DescriptionPIN NAME FUNCTION1 CC1AUX1 Controller Compensation Node. Connect a series resistor-capacitor from CC1 to GND to
compensate the converter control loop. This pin is actively driven to GND in shutdown, overload, and
thermal limit. See the AUX Compensation section.2 FB1 AUX1 Controller Feedback Input. The feedback threshold is 1.25V. This pin is high impedance in
shutdown.3 PGSD Step-Down Power Ground. Connect all PG_ pins together and to GND with short traces as close as
possible to the IC.4 LXSD Step-Down Converter Switching Node. Connect to the inductor of the step-down converter. LXSD is high
impedance in shutdown.5 PVSDStep-Down Converter Input. PVSD can connect to PVSU, effectively making OUTSD a boost-buck output
from the battery. Bypass to GND with a 1µF ceramic capacitor if connected to PVSU. PVSD can also be
connected to the battery but should not exceed PVSU by more than a Schottky diode forward voltage.
Bypass PVSD with a 10µF ceramic capacitor when connecting to the battery input. A 10kΩ internal
resistance connects PVSU and PVSD.6 ONSD Step-Down Converter On/Off Control Input. Logic high = on; however, turn-on is locked out until the step-
up has reached regulation. This pin has an internal 330kΩ pulldown resistance to GND.7 CCSDStep-Up Converter Compensation Node. Connect a series resistor-capacitor from CCSD to GND to
compensate the converter control loop. This pin is actively driven to GND in shutdown, overload, and
thermal limit. See the Step-Down Compensation section.8 FBSD Step-Down Converter Feedback Input. Connect a resistive voltage-divider from OUTSD to FBSD to GND.
The FBSD feedback threshold is 1.25V. This pin is high impedance in shutdown.9 ON1 AUX1 Controller On/Off Input. Logic high = on; however, turn-on is locked out until 1024 OSC cycles after
the step-up has reached regulation. This pin has an internal 330kΩ pulldown resistance to GND.10 ON2 AUX2 Controller On/Off Input. Logic high = on; however, turn-on is locked out until 1024 OSC cycles after
the step-up has reached regulation. This pin has an internal 330kΩ pulldown resistance to GND.11 ON3 AUX3 Controller On/Off Input. Logic high = on; however, turn-on is locked out until 1024 OSC cycles after
the step-up has reached regulation. This pin has an internal 330kΩ pulldown resistance to GND.12 ONSUStep-Up Converter On/Off Control. Logic high = on. All other ON_ pins are locked out until 1024 OSC
cycles after the step-up DC-DC converter output has reached its final value. This pin has an internal
330kΩ pulldown resistance to GND.13 REF Reference Output. Bypass REF to GND with a 0.1µF or greater capacitor. The maximum allowed load on
REF is 200µA. REF is actively pulled to GND when all converters are shut down.14 FBSU Step-Up Converter Feedback Input. Connect a resistive voltage-divider from PVSU to FBSU to GND. The
FBSU feedback threshold is 1.25V. This pin is high impedance in shutdown.15 CCSUStep-Up Converter Compensation Node. Connect a series resistor-capacitor from CCSU to GND to
compensate the converter control loop. This pin is actively driven to GND in shutdown, overload, and
thermal limit. See the Step-Up Compensation section.
MAX1584/MAX1585
5-Channel Slim DSC Power Supplies
Pin Description (continued)PIN NAME FUNCTION16AUX1OK Open-Drain Power-OK Signal for AUX1 Controller. AUX1OK is low when the AUX1 controller has
successfully completed soft-start. This pin is high impedance in shutdown, overload, and thermal limit.17 SDOK Open-Drain Power-OK Signal for Step-Down Converter. SDOK is low when the step-down has successfully
completed soft-start. This pin is high impedance in shutdown, overload, and thermal limit.18 SCFShort-Circuit Flag, Active-Low, Open-Drain Output. SCF is high impedance when overload protection
occurs and during startup. SCF can drive high-side PFET switches connected to one or more outputs to
completely disconnect the load when the channel turns off in response to a logic command or an
overload. See the Status Outputs (SDOK, AUX1OK, SCF) section.19 OSCOscillator Control. Connect a timing capacitor from OSC to GND and a timing resistor from OSC to PVSU
(or other DC voltage) to set the oscillator frequency between 100kHz and 1MHz. See the Setting the
Switching Frequency section. This pin is high impedance in shutdown.20 PGSU Step-Up Power Ground. Connect all PG_ pins together and to GND with short traces as close to the IC as
possible.21 LXSU Step-Up Converter Switching Node. Connect to the inductor of the step-up converter. LXSU is high
impedance in shutdown.22 PVSU Power Output of the Step-Up DC-DC Converter. Connect the output filter capacitor from PVSU to PGSU.
PVSU can also power other converter channels. Connect PVSU to PV at the IC.
MAX1585 (AUX2 inverter): The FB2 feedback threshold is 0V.Connect a resistive voltage-divider from the output voltage to FB2 to
REF to set the output voltage. 23 FB2AUX2 Controller Feedback Input.
This pin is high impedance in
shutdown.
MAX1584 (AUX2 step-up): The FB2 feedback threshold is 1.25V.Connect a resistive voltage-divider from the output voltage to FB2 to
GND to set the output voltage.24 CC2AUX2 Controller Compensation Node. Connect a series resistor-capacitor from CC2 to GND to
compensate the control loop. CC2 is actively driven to GND in shutdown and thermal limit. See the AUX
Compensation section.
MAX1585 (AUX2 inverter): Connect INDL2 to the external P channelMOSFET source (typically the battery) to ensure the P channel is
completely off when D2 swings high. 25 INDL2Voltage Input for the AUX2 Gate
Driver. The voltage at INDL2 sets
the high gate-drive voltage.
MAX1584 (AUX2 step-up): Connect INDL2 to PVSU for optimumN-channel gate drive.26 PV IC Power Input. Connect PVSU and PV together.
MAX1585: DL2 drives a PFET in an inverter configuration. Inshutdown, overload, and thermal limit, DL2 is driven high.27 DL2AUX2 Controller Gate-Drive
Output. DL2 drives between
INDL2 and GND.
MAX1584: DL2 drives an N-channel FET in a boost/flybackconfiguration. In shutdown, overload, and thermal limit, DL2 is driven
low.
MAX1584/MAX1585
5-Channel Slim DSC Power Supplies
Detailed DescriptionThe MAX1584/MAX1585 are complete power-conver-
sion ICs for slim digital still cameras. They can accept
input from a variety of sources, including single-cell Li+
batteries and 2-cell alkaline or NiMH batteries, as well
as systems designed to accept both battery types. The
MAX1584/MAX1585 include five DC-DC converter
channels to generate all required voltages (Figure 2
shows a functional diagram):Synchronous-rectified step-up DC-DC converter with
on-chip MOSFETs—Typically supplies 3.3V for main
system power or 5V to power other DC-DC convert-
ers for boost-buck designs.Synchronous-rectified step-down DC-DC converter
with on-chip MOSFETs—Typically supplies 1.8V for
the DSP core. Powering the step-down from the
step-up output provides efficient (up to 90%) boost-
buck functionality that supplies a regulated output
when the battery voltage is above or below the out-
put voltage. The step-down can also be powered
from the battery if there is sufficient headroom.AUX1 step-up controller—Typically used for 15V to
bias one or more of the LCD, CCD, and LED back-
lights.AUX2 step-up controller (MAX1584)—Typically sup-
plies remaining bias voltages with either a multi-out-
put flyback transformer or a boost converter with
charge-pump inverter. Alternately, can power white
LEDs for LCD backlighting.AUX2 inverter controller (MAX1585)—Typically sup-
plies negative CCD bias when high current is need-
ed for large pixel-count CCDs.AUX3 step-down controller—Typically steps 5V gen-
erated at PVSU down to 3.3V for system logic in
boost-buck designs.
Step-Up DC-DC ConverterThe step-up DC-DC switching converter is typically used
to generate a 5V output voltage from a 1.5V to 4.5V bat-
tery input, but any voltage from VINto 5V can be set. An
internal NFET switch and a PFET synchronous rectifier
allow conversion efficiencies as high as 95%. Under
moderate to heavy loading, the converter operates in a
low-noise PWM mode with constant frequency and modu-
lated pulse width. Switching harmonics generated by
fixed-frequency operation are consistent and easily fil-
tered. Efficiency is enhanced under light (<75mA typ)
loading, by an idle mode that switches the step-up only
as needed to service the load. In this mode, the maxi-
mum inductor current is 250mA for each pulse.
PIN NAME FUNCTION28 DL3 AUX3 Step-Down Controller Gate-Drive Output. Connect to the gate of a P-channel MOSFET. DL3 swings
from GND to PVSU and supplies up to 500mA. DL3 is driven to PVSU in shutdown and thermal limit.29 DL1 AUX1 Step-Up Controller Gate-Drive Output. Connect to the gate of an N-channel MOSFET. DL1 swings
from GND to PVSU and supplies up to 500mA. DL1 is driven to GND in shutdown and thermal limit.30 GND Analog Ground. Connect to all PG_ pins as close to the IC as possible.31 CC3AUX3 Step-Down Controller Compensation Node. Connect a series resistor-capacitor from CC3 to FB3 to
compensate the converter control loop. This pin is actively driven to GND in shutdown, overload, and
thermal limit. See the AUX Compensation section.32 FB3PWM Step-Up Controller 3 Feedback Input. Connect a resistive voltage-divider from the output voltage to
FB3 to GND to set the output voltage. The FB3 feedback threshold is 1.25V. This pin is high impedance in
shutdown.PAD EPExposed Underside Metal Pad. This pad must be soldered to the PC board to achieve package thermal
and mechanical ratings. There is no internal metal or bond wire physically connecting the exposed pad to
the GND pin(s). Connecting the exposed pad to ground does not remove the requirement for a good
ground connection to the appropriate IC pins.
Pin Description (continued)
MAX1584/MAX1585
5-Channel Slim DSC Power SuppliesMAX1585
OSC
CCSU
CCSD
CC1
CC2
CC3
ONSU
ONSD
ON1
ON2
ON3
330pF
47kΩR2
25kΩR3
20kΩR5
10kΩ
61.9kΩ
GND
TO PVSU
FBSD
LXSD
PVSD
PVSU
LXSU
DL1
FB1
DL3
FB3
CURRENT-
MODE
STEP-
DOWN
CURRENT-
MODE
STEP-UP
FBSU
-7.5V
-CDD
BIAS
DL2
FB2
REF
1.25V
REF
PGSU
AUX3 V-MODE
STEP-DOWN
PWM
AUX2
V-MODE
INV
PWM
AUX1
V-MODE
STEP-UP
PWM
TO VIN
PGSD
C11
47μF
30μF
4.7μF
0.1μF
0.01μF
20kΩ
+15V, 80mA
+CCD
LCD
LED
+1.5V
250mA
CORE
C24
10μF
3.6μH
VIN
1.5V TO 4.2V
5V 1A
MAIN SYSTEM
C19
10μF
5μH
TO VIN OR PVSU
INDL2
TO PVSU
OR VIN
3.3V
250mA
LOGIC
SCF
R12
274kΩ
R13
90.9kΩ
526kΩ
93.1kΩ
10μH
C25
47μFR14
30.1kΩ
R15
18.2kΩD1
2μH
4.7μFR6
1MΩ
90.9kΩ
22μH
R10
18.2kΩ
R11
90.9kΩ
4700pF
1500pF
1500pF
TO FB3
R22
1.2kΩ
C20
560pF
470pF
AUX1OK
SDOK
C23
10μF
Figure 1. MAX1584/MAX1585 Typical Application for 2-Cell AA or 1-Cell Li+ Battery
MAX1584/MAX1585
5-Channel Slim DSC Power SuppliesPVSU
2.35V
ONSU
ONSU
OSC
VREF
INTERNAL
POWER-OK
REFOK
100,000
CLOCK CYCLE
FAULT TIMER
FAULT
CLK
REF
150ns
ONE-SHOT
CCSU
FBSU
CCSD
FBSD
ONSD
STEP-UP
SOFT-START
DONE (SUSSD)
SOFT-START
RAMP
GENERATORTO
VREF
VREF
SOFT-START
RAMP GENERATOR
SUSSD
FLTALL
TO AUX_
CHANNELS
(SEE FIGURE 3)
FAULT
CURRENT-MODE
DC-DC
STEP-DOWN
SDOK
SCF
PGSD
LXSD
PVSD
ONSU
PGSU
LXSU
PVSU
GND
REF
FLTALL
FAULT
CURRENT-MODE
DC-DC
STEP-UP
1.25V
REFERENCE
TO INTERNAL
POWER
STARTUP
OSCILLATOR
NORMAL
MODE
OVER
TEMP
FLTALL
MAX1584/
MAX1585
Figure 2. MAX1584/MAX1585 Functional Diagram
MAX1584/MAX1585
5-Channel Slim DSC Power Supplies
Step-Down DC-DC ConverterThe step-down DC-DC converter is optimized for gen-
erating low output voltages (down to 1.25V) at high effi-
ciency. Output voltages lower than 1V can be set by
adding an additional resistor (see the Applications
Informationsection). The step-down runs from the volt-
age at PVSD. This pin can be connected directly to the
battery if sufficient headroom exists to avoid dropout;
otherwise, PVSD can be powered from the output of
another converter. The step-down can also operate
with the step-up for boost-buck operation.
Under moderate to heavy loading, the converter oper-
ates in a low-noise PWM mode with constant frequency
and modulated pulse width. Efficiency is enhanced
under light (<75mA typ) loading by assuming an idle
mode during which the step-down switches only as
needed to service the load. In this mode, the maximum
inductor current is 100mA for each pulse. The step-
down DC-DC is inactive until the step-up DC-DC is in
regulation.
The step-down also features an open-drain SDOKout-
put that goes low when the step-down output is in regu-
lation. SDOKcan be used to drive an external MOSFET
switch that gates 3.3V power to the processor after the
core voltage is in regulation. This connection is shown
in Figure 13.
Boost-Buck OperationThe step-down input can be powered from the output
of the step-up. By cascading these two channels, the
step-down output can maintain regulation even as the
battery voltage falls below the step-down output volt-
age. This is especially useful when trying to generate
3.3V from 1-cell Li+ inputs, or 2.5V from 2-cell alkaline
or NiMH inputs, or when designing a power supply that
must operate from both Li+ and alkaline/NiMH inputs.
Compound efficiencies of up to 90% can be achieved
when the step-up and step-down are operated in
series.
Note that the step-up output supplies both the step-up
load and the step-down input current when the step-
down is powered from the step-up. The step-down
input current reduces the available step-up output cur-
rent for other loads.
Direct Battery Step-Down OperationThe step-down converter can also be operated directly
from the battery as long as the voltage at PVSD does
not exceed PVSU by more than a Schottky diode for-
ward voltage. When using this connection, connect an
external Schottky diode from the battery input to PVSU.
On the MAX1584/MAX1585, there is an internal 10kΩ
resistance from PVSU to PVSD. This adds a small addi-
tional current drain (of approximately (VPVSU- VPVSD) /
10kΩ) from PVSU when PVSD is not connected directly
to PVSU.
Step-down direct battery operation improves efficiency
for the step-down output (up to 95%), but restricts the
upper limit of the output voltage to 200mV less than the
minimum battery voltage. In 1-cell Li+ designs (with a
2.7V min), the output can be set up to 2.5V. In 2-cell
alkaline or NiMH designs, the output can be limited to
1.5V or 1.8V, depending on the minimum-allowed cell
voltage.
The step-down can only be briefly operated in dropout
since the MAX1584/MAX1585 fault protection detects
the out-of-regulation condition and activates after
100,000 OSC cycles (200ms at fOSC= 500kHz). At that
point, all MAX1584/MAX1585 channels shut down.
AUX1, AUX2, and AUX3 DC-DC ControllersThe three auxiliary controllers operate as fixed-frequen-
cy voltage-mode PWM controllers. They do not have
internal MOSFETs, so output power is determined by
external components. The controllers regulate output
voltage by modulating the pulse width of the DL_ drive
signal to an external MOSFET switch. The MAX1584
contains two step-up/flyback controllers (AUX1 and
AUX2) and one step-down controller (AUX3). The
MAX1585 contains one step-up controller (AUX1), one
inverting controller (AUX2), and one step-down con-
troller (AUX3).
Figure 3 shows a functional diagram of the AUX con-
trollers. The inverting and step-down controllers differ
from the step-up controllers only in the gate-drive logic
and FB polarity and threshold. The sawtooth oscillator
signal at OSC governs timing. At the start of each
cycle, DL_ turns on the external MOSFET switch. For
step-up controllers, DL_ goes high, while for inverting
and step-down controllers, DL_ goes low (to turn on
PFETs). The external MOSFET then turns off when the
internally level-shifted sawtooth rises above CC_ or
when the maximum duty cycle is exceeded. The switch
remains off until the start of the next cycle. A transcon-
ductance error amplifier forms an integrator at CC_ so
that high DC loop gain and accuracy can be main-
tained. In step-up and step-down controllers, the FB_
threshold is 1.25V, and higher FB_ voltages reduce the
MOSFET duty cycle. In inverting controllers, the FB_
threshold is 0V, and lower (more negative) FB_ volt-
ages reduce the MOSFET duty cycle.
Auxiliary controllers do not start until the step-up DC-DC
output is in regulation. If the step-up, step-down, or any
of the auxiliary controllers remains faulted for 100,000
