SiC403
Vishay Siliconix
microBUCK
®
SiC403
6 A, 28 V Integrated Buck Regulator with Programmable LDO
DESCRIPTION
The Vishay Siliconix SiC403 is an advanced stand-alone
synchronous buck regulator featuring integrated power
MOSFETs, bootstrap switch, and a programmable LDO in a
space-saving MLPQ 5 x 5 - 32 pin package.
The SiC403 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 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 SiC403 also provides an
enable input and a power good output.
FEATURES
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High efficiency > 95 %
6 A continuous output current capability
Integrated bootstrap switch
Programmable 200 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
Programmable soft-start
Soft-shutdown
1 % internal reference voltage
Power good output
Under and over voltage protection
Material categorization: For definitions of compliance
please see
www.vishay.com/doc?99912
PRODUCT SUMMARY
Input Voltage Range
Output Voltage Range
Operating Frequency
Continuous Output Current
Peak Efficiency
Package
3 V to 28 V
0.75 V to 5.5 V
200 kHz to 1 MHz
6A
95 % at 300 kHz
MLPQ 5 mm x 5 mm
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
3.3
V
EN/PSV (Tri-State)
LDO_EN
EN\PSV
P
GOOD
V
OUT
A
GND
ENL
T
ON
P
GOOD
I
LIM
32 31 30 29 28 27 26 25
LX
LX
FB
V
OUT
V
DD
A
GND
FBL
V
IN
V
IN
1
2
3
4
5
6
8
10
11
24
LX
LX
P
GND
P
GND
P
GND
P
GND
P
GND
P
GND
V
OUT
PAD 1
A
GND
PAD 3
PAD 2
V
IN
NC
12
LX
13
23
22
21
20
19
18
17
LX
SS
7
BST
NC
14
SiC403 (MLP 5 x 5-32L)
Document Number: 66550
S12-0628-Rev. C, 19-Mar-12
For technical support, please contact:
analogswitchtechsupport@vishay.com
P
GND
15
P
GND
V
IN
V
IN
V
IN
16
9
www.vishay.com
1
This document is subject to change without notice.
THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT
www.vishay.com/doc?91000
VISHAY [ VISHAY TELEFUNKEN ]
