Highly Integrated 35A Single‐input Voltage,
iP1837
Synchronous Buck Regulator
FEATURES
DESCRIPTION
The iP1837 iPOWIRTM is 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.
Wide input application 1.5V―16V
Single 3.3V or single 5V application
Output Voltage Range: 0.6V to 0.75*Vin
0.5% accurate Reference Voltage
Programmable Switching Frequency up to 1.5MHz
Programmable Soft‐Start
iP1837 is a versatile regulator which offers programmability
of switching frequency and current limit while operating in
wide input and output voltage range.
Enable input with Voltage Monitoring Capability
Remote Sense Amplifier with True Converter
Voltage Sensing
The switching frequency is programmable from 250kHz to
1.5MHz for an optimum solution.
Thermally compensated Hiccup Mode
Over Current Protection
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.
Over‐voltage protection
Pre‐Bias Start up
Body Braking to improve transient
Integrated MOSFET drivers and Bootstrap diode
Operating temp: ‐40oC<Tj<125oC
Thermal Shut Down
APPLICATIONS
Server Application
Netcom Applications
Power Good Output with Window Comparator
Small Size 7.7mmx7.7mm LGA
Halogen Free, Pb‐Free and RoHS Compliant
Embedded Telecom Systems
Distributed Point of Load Power Architectures
BASIC APPLICATION
97
96
95
94
93
92
91
90
89
88
87
Vin=12V
Vcc=3.3V
Room Temperature
200 LFM airflow
Includes biasing loss as well as inductor
losses and stray PCB losses
iP1837
3.5
7
10.5
14
17.5
Iout (A)
Vo=3.3V Vo=1.8V
21
24.5
28
31.5
35
Figure 2: iP1837 Efficiency
Figure 1 : iP1837 Basic Application Circuit
1
March 5, 2012 | V1.26
97600