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IP1837TRPBF
35A IpowIR Regulator with 5V or 3.3V bias in 7.7x7.7
International
TOR Rectifier
Highly Integrated 35A Single-input Voltage,
LPOWIRW
TECHNOLOGY
Synchronous Buck Regulator
FEATURES
0 Wide input application 1.5V-16V
q Single 3.3V or single 5V application
q Output Voltage Range: 0.6V to 0.75*Vin
o 0.5% accurate Reference Voltage
q Programmable Switching Frequency up to 1.5MHz
q Programmable Soft-Start
q Enable input with Voltage Monitoring Capability
. Remote Sense Amplifier with True Converter
Voltage Sensing
o Thermally compensated Hiccup Mode
Over Current Protection
q Over-voltage protection
q Pre-Bias Start up
q Body Braking to improve transient
q Integrated MOSFET drivers and Bootstrap diode
q Operating temp: -40oc
q Thermal Shut Down
q Power Good Output with Window Comparator
0 Small Size 7.7mmx7.7mm LGA
q Halogen Free, Pb-Free and RoHS Compliant
DESCRIPTION
The iP1837 iPOWlRTMis an easy-to-use, fully integrated
and highly efficient DC/DC regulator. The onboard PWM
controller and MOSFETs make iP1837 a space-efficient
solution, providing accurate power delivery for low output
voltage and high current applications.
iP1837 is a versatile regulator which offers programmability
of switching frequency and current limit while operating in
wide input and output voltage range.
The switching frequency is programmable from 250kHz to
1.5MHz for an optimum solution.
It also features important protection functions, such as
Pre-Bias startup, hiccup current limit and thermal
shutdown to give required system level security in the
event of fault conditions.
APPLICATIONS
. Server Application
. Netcom Applications
. Embedded Telecom Systems
. Distributed Point of Load Power Architectures
BASIC APPLICATION
1.5V VCC=3.3V
iIH i—T
VCC En Vin OCSet
PVCC Vo
PGood Vosp
PGD iP1837 Vosm T
Rt Voso T
g r SS Fb
T Comp
LGnd BiasGnd PGnd
Figure 1 : iP1837 Basic Application Circuit
cocooto
Efficiency (%)
9 g ‘0
Room Temperature
200 LFM airflow
Includes biasing loss as well as inductor
losses and stray PCB losses
3.5 7 10.5 14 17.5 21 24.5 28 31.5 35
Ioul (A)
-W--3.3V -Vo--1.8V
Figure 2: iP1837 Efficiency
ll March 5,2012 l V1.26
International
4. . . Highly Integrated 35A Single-input Voltage,
TOR ReCh h er Synchronous Buck Regulator
LPOWIIRW
“(HNOLOGY
tiRileai
PIN DIAGRAM
F PIN 1
PIN 17
PIN 16 PIN 7 PIN 2
voso I I VOSP SW
PIN 15 PIN 8
E I VCC PIN a
PIN 14 PIN 10
PGD I OCSET PGND
PIN 13 PIN 11
BiasGND
Figure 3: iP1837 Package Bottom View
7.65mm x 7.65mm LGA
ORDERING INFORMATION
ej_pcb=2 . 3 OC/W
Tape and Reel Qty
(7.65mm x 7.65mm body) 2000
iP1837TRPbF
8 March 5,2012 I V1.26
