IP1837 Datasheet, PDF (1/40 Pages) International Rectifier – Highly Integrated 35A Single‐input Voltage, Synchronous Buck Regulator

Highly Integrated 35A Single‐input Voltage,
Synchronous Buck Regulator
iP1837
FEATURES
 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
 Enable input with Voltage Monitoring Capability
 Remote Sense Amplifier with True Converter
Voltage Sensing
 Thermally compensated Hiccup Mode
Over Current Protection
 Over‐voltage protection
 Pre‐Bias Start up
 Body Braking to improve transient
 Integrated MOSFET drivers and Bootstrap diode
 Operating temp: ‐40^oC<Tj<125^oC
 Thermal Shut Down
 Power Good Output with Window Comparator
 Small Size 7.7mmx7.7mm LGA
 Halogen Free, Pb‐Free and RoHS Compliant
DESCRIPTION
The iP1837 iPOWIR^TM 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.
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
iP1837
97
96
95
94
93
92
91
90
89
88
87
3.5
Vin=12V
Vcc=3.3V
Room Temperature
200 LFM airflow
Includes biasing loss as well as inductor
losses and stray PCB losses
7
10.5
14
17.5
21
24.5
28
31.5
35
Iout (A)
Vo=3.3V Vo=1.8V
Figure 1 : iP1837 Basic Application Circuit
Figure 2: iP1837 Efficiency
1 March 5, 2012 | V1.26
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