SIC401A Datasheet, PDF (1/28 Pages) Vishay Siliconix – 15 A microBUCK SiC401A/B Integrated Buck Regulator with Programmable LDO

SiC401A, SiC401BCD
Vishay Siliconix
15 A microBUCK^® SiC401A/B
Integrated Buck Regulator with Programmable LDO
DESCRIPTION
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.
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.
PRODUCT SUMMARY
Input Voltage Range
Output Voltage Range
Operating Frequency
Continuous Output Current
Peak Efficiency
Package
3 V to 17 V
0.6 V to 5.5 V
200 kHz to 1 MHz
15 A
93 %
PowerPAK MLP55-32L
FEATURES
• High efficiency > 93 %
• 15 A continuous output current capability
• Integrated bootstrap switch
• 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
• Power good output
• Over-voltage and under-voltage protections
• Material categorization: For definitions of compliance
please see www.vishay.com/doc?99912
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 AND PACKAGE OPTIONS
VOUT
EN/PSV (Tri-State)
LDO_EN
PGOOD
32 31 30 29 28 27 26 25
FB
1
LX
24
VOUT
PAD 1
LX
2
23
VDD
3
AGND
PGND
22
AGND
4
PAD 3
PGND
21
VIN
FBL
5
VIN ₆
PAD 2
LX
20 ^PGND
19 ^PGND
SS ₇
VIN
BST ₈
18 ^PGND
17 ^PGND
VOUT
Typical Application Circuit for SiC401A/B (PowerPAK MLP5x5-32L)
Document Number: 63835
For technical questions, contact: [e-mail]
www.vishay.com
S12-2109-Rev. C, 03-Sep-12
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