MAX846AEEE+ Fast Delivery |IC PHOENIX CO.,LIMITED

MAX846AEEE+ ,Cost-Saving, Multichemistry, Battery Charger SystemFeaturesThe MAX846A is a cost-saving multichemistry battery- ♦ Multichemistry Charger System (Li-Io ..
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MB8264A-10 , MOS 65536-BIT DYNAMIC RANDOM ACCESS MEMORY

MAX846AEEE+
Cost-Saving, Multichemistry, Battery Charger System
_______________General Description
The MAX846A is a cost-saving multichemistry battery-
charger system that comes in a space-saving 16-pin
QSOP. This integrated system allows different battery
chemistries (Li-Ion, NiMH or NiCd cells) to be charged
using one circuit.
In its simplest application, the MAX846A is a stand-
alone, current-limited float voltage source that charges
Li-Ion cells. It can also be paired up with a low-cost
microcontroller (μC) to build a universal charger capa-
ble of charging Li-Ion, NiMH, and NiCd cells.
An internal 0.5%-accurate reference allows safe charg-
ing of Li-Ion cells that require tight voltage accuracy.
The voltage- and current-regulation loops used to con-
trol a low-cost external PNP transistor (or P-channel
MOSFET) are independent of each other, allowing more
flexibility in the charging algorithms.
The MAX846A has a built-in 1%, 3.3V, 20mA linear regu-
lator capable of powering the μC and providing a refer-
ence for the μC’s analog-to-digital converters. An
on-board reset notifies the controller upon any unex-
pected loss of power. The μC can be inexpensive, since
its only functions are to monitor the voltage and current
and to change the charging algorithms.
________________________Applications
Li-Ion Battery Packs
Desktop Cradle Chargers
Li-Ion/NiMH/NiCd Multichemistry Battery
Chargers
Cellular Phones
Notebook Computers
Hand-Held Instruments
____________________________FeatureMultichemistry Charger System (Li-Ion, NiMH, NiCd)Independent Voltage and Current Loops±0.5% Internal Reference for Li-Ion CellsLowers Cost:
—Stands Alone or Uses Low-Cost μC
—Built-In 1% Linear Regulator Powers μC
—Linear Regulator Provides Reference to μC ADCs
—Built-In μC Reset
—Controls Low-Cost External PNP Transistor or
P-Channel MOSFETSpace-Saving 16-Pin QSOPCharging-Current-Monitor Output<1μA Battery Drain when Off
Cost-Saving Multichemistrttery-Charger Syste
__________________Pin Configuration
MAX846A
Li-ION
BATTERY
ISET
CELL2
GND
PGND
DCIN
CS+
CS-
DRV
3.5V
TO
20V
CCV
CCI
PWROK
BATT
DRV
PGND
CS-
CS+
BATT
ON
CELL2
PWROK
DCIN
VL
CCI
GND
CCV
VSET
ISET
OFFV
TOP VIEW
MAX846A
QSOP
__________Typical Operating Circuit
19-1121; Rev 0; 9/96
PART
MAX846AC/D
MAX846AEEE-40°C to +85°C
0°C to +70°C
TEMP. RANGEPIN-PACKAGE
Dice*
16 QSOP
*Dice are tested at TA= +25°C only. Contact factory for details.
______________Ordering Information
EVALUATION KIT
AVAILABLE
Cost-Saving Multichemistryttery-Charger System
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(VDCIN= 10V, ON = VL, IVL= IVSET= 0mA, VCS- = VCS+= 10V, VBATT= 4.5V, VOFFV= VCELL2= 0V, TA= 0°C to +85°C, unless
otherwise noted. Typical values are at TA= +25°C.)
Stresses 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.
DCIN, DRV, CS+, CS-, BATT to GND........................-0.3V, +21V
PGND to GND.....................................................................±0.3V
VL to GND......................................................................-0.3V, 7V
IPWROK................................................................................10mA
PWROK, ISET, CCI, CCV, OFFV, VSET,
CELL2, ON to GND............................................-0.3V, VL + 0.3V
CS+ to CS-..........................................................................±0.3V
VL Short to GND.........................................................Continuous
IDRV...................................................................................100mA
Continuous Power Dissipation (TA= +70°C)
QSOP (derate 8.3mW/°C above +70°C)........................667mW
Operating Temperature Range
MAX846AEEE....................................................-40°C to +85°C
Junction Temperature......................................................+150°C
Storage Temperature Range.............................-65°C to +160°C
Lead Temperature (soldering, 10sec).............................+300°C
Measured at VSET, IVSET= 0mA, VON= 0V
Rising VL edge, 2% hysteresis
VL = GND
0mA < IVL< 20mA, 3.7V < VDCIN< 20V
CONDITIONS-0.5%1.650+0.5%2.52.9VL Undervoltage-Lockout Level2.93.03.1PWROK Trip Level50Short-Circuit Current Limit3.2673.3053.333Output Voltage3.720.0Operating Range
UNITSMINTYPMAXPARAMETER
Output Voltage-2%20+2%Output Resistance
TransconductanceVISET= 1.7V, VCS+- VCS-= 165mV0.9511.05mA/V
Output Offset CurrentVCS+= 4V3mA
Input Common-Mode RangeMeasured at VCS-, VCS+- VCS-= 165mV2.120.0V
Maximum Differential Input VoltageVCS-= VISET = 2.1V,
CSA transconductance >0.9mA/V225mV
CS- Lockout VoltageWhen VCS-is less than this voltage, DRV is
disabled.1.92.1V
CS+, CS- Input CurrentVCS+= 20V, VCS+-VCS-= 165mV250mA
CS+, CS- Off Input CurrentDCIN = VL = ON = GND0.0110mA
VDCIN= 20V, IDRV= IVL= 0mAmA5DCIN Supply Current
VL REGULATOR
REFERENCE
CURRENT-SENSE AMPLIFIER
MAX846A
Cost-Saving Multichemistryttery-Charger System
ELECTRICAL CHARACTERISTICS (continued)
(VDCIN= 10V, ON = VL, IVL= IVSET= 0mA, VCS- = VCS+= 10V, VBATT= 4.5V, VOFFV= VCELL2= 0V, TA= 0°C to +85°C, unless
otherwise noted. Typical values are at TA= +25°C.)
VBATT= 10V, ON = GND, CELL2 = GND or VLmA0.011BATT Off Input Current
Current-Loop Set PointIDRV= 5mA, VDRV= 10V
VBATT= 10V, CELL2 = GND or VL
1mA < IDRV< 5mA
1.6341.6501.666V
VVSET= 1.650V, VCELL2= VL, IDRV= 1mA,
VDRV= 10V
CA Voltage Gain5
CONDITIONS
V/V
CCI Output Impedance50kΩ
Overcurrent Trip LevelWhen VISET exceeds this voltage, DRV current
is disabled.1.902.1V
DRV Sink CurrentVDRV= 3V20mA
DRV Off Current VDRV= 20V, VON= 0V 0.1100mA
225mABATT Input Current0.05Voltage-Loop Load Regulation150CCV Output Impedance1.252.0VSET Common-Mode Input Range
Voltage-Loop Set Point
-0.25%8.4+0.25%
-0.25%4.2+0.25%
UNITSMINTYPMAXPARAMETER
Input High LevelCELL2, ON, OFFV2.4VLV
Input Low LevelCELL2, ON, OFFV00.8V
Input CurrentCELL2, ON, OFFV0.011mA
PWROK Output Low LevelIPWROK= 1mA, VDCIN= VVL= 2.5V0.4V
PWROK Output High LeakageVPWROK= 3.3V0.011mA
VOLTAGE LOOP
CURRENT LOOP
LOGIC INPUTS AND OUTPUTS
DRIVER
VVSET= 1.650V, VCELL2= 0V, IDRV= 1mA,
VDRV= 10V
MAX846A
Cost-Saving Multichemistryttery-Charger System
ELECTRICAL CHARACTERISTICS (Note 1)
(VDCIN= 10V, ON = VL, IVL= IVSET= 0mA, VCS- = VCS+= 10V, VBATT= 4.5V, VOFFV= VCELL2= 0V, TA= -40°C to +85°C, unless
otherwise noted.)-2%20+2%Output Resistance
TransconductanceVISET= 1.7V, VCS+- VCS-= 165mV
Measured at VSET, IVSET= 0mA, VON= 0V
0.931.07mA/V
Rising VL edge, 2% hysteresis
Output Offset CurrentVCS+= 4V
0mA < IVL< 20mA, 3.7V < VDCIN< 20V
CONDITIONSA
CS+, CS- Off Input CurrentVON = 0V, VCS+= VCS-= 10V10mA
VVSET= 1.650V, VCELL2= 0V, IDRV= 1mA,
VDRV= 10V-0.35%4.2+0.35%
BATT Off Input CurrentVBATT= 10V, ON = GND, CELL2 = GND or VL1mA-0.7%1.650+0.7%Output Voltage2.93.1PWROK Trip Level3.2593.341Output Voltage
UNITSMINTYPMAXPARAMETER
Voltage-Loop Set Point
VVSET= 1.650V, VCELL2= VL, IDRV= 1mA,
VDRV= 10V-0.35%8.4+0.35%
Current-Loop Set PointIDRV= 5mA, VDRV= 10V1.6251.675V
Overcurrent Trip LevelWhen VISET exceeds this voltage, DRV current
is disabled.1.862.14V
DRV Off Current
DRV Sink CurrentVDRV= 3V20mA
VDRV= 20V, ON = GND100mA
Note 1:Specifications to -40°C are guaranteed by design and not production tested.
VDCIN= 20V, IDRV= IVL= 0mAmA5DCIN Supply Current2.53.0VL Undervoltage-Lockout Level
VL REGULATOR
REFERENCE
CURRENT-SENSE AMPLIFIER
VOLTAGE LOOP
CURRENT LOOP
DRIVER
Cost-Saving Multichemistryttery-Charger Syste
CURRENT-SENSE AMPLIFIER
TRANSCONDUCTANCE vs. ISET VOLTAGE
AX846-01
ISET VOLTAGE (V)
(m
1.005V = 165mVV = 200mVV = 250mVV = 100mVV = VCS+ - VCS-2610
BATTERY INPUT CURRENT
vs. BATTERY VOLTAGE
AX846-02
BATT VOLTAGE (V)
IN815937
CELL2 = VL
CELL2 = GND
82kW
OFF
128kW
-12010k100k1k1001M
CURRENT-LOOP GAIN
MAX846-03
FREQUENCY (Hz)
(d
(D
CCCI = 10nF
GAIN
PHASE
--12010k100k1k1001M
VOLTAGE-LOOP GAIN
MAX846-04
FREQUENCY (Hz)
(d
(D
= - Charging at 100mA
= -Charging at 200mA
2 Li-Ion Cells
CCCV = 10nF
COUT = 4.7mF
TIP2955 PNP PASS TRANSISTOR
GAIN
PHASE
Li-ION CHARGING PROFILE
MAX846-04
TIME (MINUTES)
(V
CHARGING CURRENT
BATTERY VOLTAGE
__________________________________________Typical Operating Characteristic
(TA = +25°C, unless otherwise noted.)
Cost-Saving Multichemistryttery-Charger System
______________________________________________________________Pin Description
PINFUNCTIONFloat-Voltage Reference-Adjust Input. Leave VSET open for a 4.2V default. See the Applications
Informationsection for adjustment information.
NAMEGroundCurrent-Regulation-Loop Compensation Pin. Connect a compensation capacitor (typically 10nF) from
CCI to VL.3.3V, 20mA, 1% Linear-Regulator Output. VL powers the system μC and other components. Bypass to
GND with a 4.7μF tantalum or ceramic capacitor.Supply Input from External DC Source. 3.7V ≤VDCIN≤20V.Voltage-Regulation-Loop Compensation Pin. Connect a compensation capacitor (typically 10nF) from
CCV to VL.
VSET
CCV
GND
CCI
DCINISET
Current-Set Input/Current-Monitor Output. ISET sets the current-regulation point. Connect a resistor
from ISET to GND to monitor the charging current. ISET voltage is regulated at 1.65V by the current-
regulation loop. To adjust the current-regulation point, either modify the resistance from ISET to ground
or connect a fixed resistor and adjust the voltage on the other side of the resistor (Figure 5). The
transconductance of the current-sense amplifier is 1mA/V.OFFVLogic Input that disables the voltage-regulation loop. Set OFFV high for NiCd or NiMH batteries.PWROKOpen-Drain, Power-Good Output to μC. PWROK is low when VL is less than 3V. The reset timeout peri-
od can be set externally using an RC circuit (Figure 3).CELL2Digital Input. CELL2 programs the number of Li-Ion cells to be charged. A high level equals two cells; a
low level equals one cell.ONCharger ON/OFF Input. When low, the driver section is turned off and IBATT<1μA. The VL regulator is
always active.BATTBattery Input. Connect BATT to positive battery terminal.CS+Current-Sense Amplifier High-Side Input. Connect CS+ to the sense resistor’s power-source side. The
sense resistor may be placed on either side of the pass transistor.CS-Current-Sense Amplifier Low-Side Input. Connect CS- to the sense resistor’s battery side.PGNDPower GroundDRVExternal Pass Transistor (P-channel MOSFET or PNP) Base/Gate Drive Output. DRV sinks current only.
_______________Detailed Description
The MAX846A battery-charging controller combines
three functional blocks: a 3.3V precision, low-dropout
linear regulator (LDO), a precision voltage reference,
and a voltage/current regulator (Figure 1).
Linear Regulator
The LDO regulator output voltage (VL) is two times the
internal reference voltage; therefore, the reference and
LDO track. VL delivers up to 20mA to an external load
and is short-circuit protected. The power-good output
(PWROK) provides microcontroller (μC) reset and
charge-current inhibition.
Voltage Reference
The precision internal reference provides a voltage to
accurately set the float voltage for lithium-ion (Li-Ion)
battery charging. The reference output connects in
series with an internal, 2%-accurate, 20kΩresistor. This
allows the float voltage to be adjusted using one exter-
nal 1% resistor (RVSET) to form a voltage divider
(Figure 4). The float-voltage accuracy is important for
battery life and to ensure full capacity in Li-Ion batter-
ies. Table 1 shows the accuracies attainable using the
MAX846A.

Partno	Mfg	Dc	Qty	Available	Descript
MAX846AEEE+ \|MAX846AEEE	MAX	N/a	190	avai	Cost-Saving, Multichemistry, Battery Charger System