Vishay Siliconix
SiC417
Document Number: 69062
S10-1367-Rev. D, 14-Jun-10
www.vishay.com
1
microBUCK
TM
SiC417
10-A, 28-V Integrated Buck Regulator with Programmable LDO
DESCRIPTION
The Vishay Siliconix SiC417 is an advanced stand-alone
synchronous buck regulator featuring integrated power
MOSFETs, bootstrap diode, and a programmable LDO in a
space-saving MLPQ 5 x 5 - 32 pin package.
The SiC417 is capable of operating with all ceramic solutions
and switching frequencies up to 1 MHz. The programmable
frequency, synchronous operation and selectable
power-save allow operation at high efficiency across the full
range of load current. The internal programmable LDO may
be used to supply 5 V for the gate drive circuits or it may be
bypassed with an external 5 V for optimum efficiency and
used to drive external N-channel MOSFETs or other loads.
Additional features include cycle-by-cycle current limit,
voltage soft-start, under-voltage protection, programmable
over-current protection, soft shutdown and selectable
power-save. The Vishay Siliconix SiC417 also provides an
enable input and a power good output.
FEATURES
" High efficiency > 92 %
" Internal power MOSFETs:
High-side R
DS(ON)
= 27 m?
Low-side R
DS(ON)
= 9 m?/DIV>
" Integrated bootstrap diode
" Integrated configurable 150 mA LDO with bypass logic
" Temperature compensated current limit
" Pseudo fixed-frequency adaptive on-time control
" All ceramic solution enabled
" Programmable input UVLO threshold
" Independent enable pin for switcher and LDO
" Selectable ultra-sonic power-save mode
" Internal soft-start and soft-shutdown
" 1 % internal reference voltage
" Power good output and over voltage protection
" Halogen-free according to IEC 61249-2-21 definition
" Compliant to RoHS directive 2002/95/EC
APPLICATIONS
" Notebook, desktop and server computers
" Digital HDTV and digital consumer applications
" Networking and telecommunication equipment
" Printers, DSL and STB applications
" Embedded applications
" Point of load power supplies
TYPICAL APPLICATION CIRCUIT
PRODUCT SUMMARY
Input Voltage Range
3 V to 28 V
Output Voltage Range
0.5 V to 5.5 V
Operating Frequency
200 kHz to 1 MHz
Continuous Output Current
10 A
Peak Efficiency
95 % at 300 kHz
Package
MLPQ 5 mm x 5 mm
15
6
13
8
P
GOOD
EN-P
SAVE
EN-LDO
32
26
29
3
2
7
31
30
5
1
14
12
27
PWM
Controller
DH
V5V
V
IN
BST
V
LDO
FBL
LX
EN/PSV
I
LIM
P
GOOD
ENL
P
GND
t
ON
V
OUT
A
GND
FB DL
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