SiC401A, SiC401BCD
Vishay Siliconix
15 A microBUCK® SiC401A/B
Integrated Buck Regulator with Programmable LDO
DESCRIPTION
FEATURES
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High efficiency > 93 %
15 A continuous output current capability
Integrated bootstrap switch
The Vishay Siliconix SiC401A/B an advanced stand-alone
synchronous buck regulator featuring integrated power
MOSFETs, bootstrap switch, and a programmable LDO in a
space-saving PowerPAK MLP55-32L pin packages.
Programmable 200 mA LDO with bypass logic
Temperature compensated current limit
All ceramic solution enabled
Pseudo fixed-frequency adaptive on-time control
Programmable input UVLO threshold
Independent enable pin for switcher and LDO
Selectable ultra-sonic power-save mode (SiC401A)
Selectable power-save mode (SiC401B)
Programmable soft-start and soft-shutdown
1 % internal reference voltage
The SiC401A/B 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 SiC401A/B also provides
an enable input and a power good output.
Power good output
Over-voltage and under-voltage protections
Material categorization: For definitions of compliance
please see www.vishay.com/doc?99912
PRODUCT SUMMARY
APPLICATIONS
Input Voltage Range
Output Voltage Range
Operating Frequency
Continuous Output Current
Peak Efficiency
3 V to 17 V
0.6 V to 5.5 V
200 kHz to 1 MHz
15 A
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Notebook, desktop and server computers
Digital HDTV and digital consumer applications
Networking and telecommunication equipment
Printers, DSL, and STB applications
Embedded applications
93 %
Package
PowerPAK MLP55-32L
Point of load power supplies
TYPICAL APPLICATION CIRCUIT AND PACKAGE OPTIONS
EN/PSV (Tri-State)
P
GOOD
LDO_EN
V
OUT
31 30 29 28 27 26 25
32
V
OUT
LX
LX
FB
24
23
22
21
20
19
18
17
1
V
OUT
PAD 1
2
3
4
5
6
7
8
V
P
DD
GND
GND
A
GND
A
P
GND
PAD 3
LX
P
P
P
FBL
GND
GND
V
IN
PAD 2
V
IN
SS
V
IN
GND
GND
BST
P
Typical Application Circuit for SiC401A/B (PowerPAK MLP5x5-32L)
Document Number: 63835
S12-2109-Rev. C, 03-Sep-12
For technical questions, contact: powerictechsupport@vishay.com
This document is subject to change without notice.
www.vishay.com
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THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000