Rev. 1.1 10/09
Copyright ?2009 by Silicon Laboratories
Si3500
50 V INPUT DC TO DC CONVERTER
Features
Applications
Description
The Si3500 is a highly-integrated, high-voltage (42 to 57 V) input dc-to-dc
converter with integrated PWM control and power FET. The output can be
adjusted for various applications in the range of 1.8 to 12 VDC.
The integrated hot swap switch provides a 2-level current limit for slow
charging of the input filter capacitor followed by overcurrent protection at
400 mA.
The hot swap switch overcurrent protection fully protects the Si3500 from
short-circuit damage as long as the inductor does not saturate. For
situations where it is desirable to use a smaller inductor, it is possible to
reduce the overcurrent protection with the addition of one low-cost
transistor.
The Si3500 can be configured to provide an isolated output voltage or a
non-isolated output that is positive or negative with respect to the positive
input rail.
Input undervoltage and overvoltage lockout functions are fully-integrated.
A 65 V input clamp is also integrated. Output voltage softstart is enabled
by just one capacitor to control the output rise time at startup.
n Integrated switching regulator
controller with on-chip power FET
n Input range 42 to 57 V
n Output can be set from 1.8 to
12 V
n Output power up to 10 W
n Highly-integrated IC enables
compact solution footprints
l Minimal external components
l Integrated transient surge
suppressor
l Integrated dual current-limited
hotswap switch
l Integrated switching power FET
n Supports non-isolated and
isolated switching topologies
n Comprehensive protection
circuitry
l Transient overvoltage protection
l Undervoltage lockout
l Thermal shutdown protection
l Short circuit protection
n 50% duty cycle limiting
n Low-profile, 5x5 mm, 20-pin QFN
n RoHS-compliant
n 3.3 V power supply generation
for Power over Ethernet Power
Sourcing supply, such as Si3452
n Internet appliances
n Network devices
Ordering Information:
See Ordering Guide on page
page 14.
Pin Assignments
5 x 5 mm QFN
(Top View)
VNEG
(PAD)
EROUT
SSFT
NC
VPOSF
NC
NC
OSSFT
VDD
5
6
7
8
9
10
15
16
20 19 18 17
1
2
3
4
11
12
13
14
Si3500
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