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.
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
TYPICAL APPLICATION CIRCUIT
VOUT
EN/PSV (Tri-State)
LDO_EN
FEATURES
• Halogen-free According to IEC 61249-2-21
Definition
• 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
• Compliant to RoHS Directive 2002/95/EC
APPLICATIONS
www.DataSheet.net/
•
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
3.3 V
PGOOD
32 31 30 29 28 27 26 25
FB
1
LX
24
VOUT
2
PAD 1
LX
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
18 PGND
BST 8
17 PGND
VOUT
SiC403 (MLP 5 x 5-32L)
Document Number: 66550
www.vishay.com
S11-1638-Rev. B, 15-Aug-11
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
Datasheet pdf - http://www.DataSheet4U.co.kr/
