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Vishay Intertechnology Electronic Components Datasheet

SIC403 Datasheet

microBUCK SiC403

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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
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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
• 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/


Vishay Intertechnology Electronic Components Datasheet

SIC403 Datasheet

microBUCK SiC403

No Preview Available !

SiC403
Vishay Siliconix
PIN CONFIGURATION (TOP VIEW)
FB 1
VOUT 2
VDD 3
AGND 4
FBL 5
VIN 6
SS 7
BST 8
32 31 30 29 28 27 26 25
PAD 1
AGND
PAD 2
VIN
PAD 3
LX
24 LX
23 LX
22 PGND
21 PGND
20 PGND
19 PGND
18 PGND
17 PGND
PIN DESCRIPTION
Pin Number
Symbol
1 FB
2
3
4, 30, PAD 1
5
VOUT
VDD
AGND
FBL
6, 9-11, PAD 2
7
8
12
13, 23-25, 28, PAD 3
14
15-22
26
27
29
VIN
SS
BST
NC
LX
NC
PGND
PGOOD
ILIM
EN/PSV
31 TON
32 ENL
Description
Feedback input for switching regulator. Connect to an external resistor divider from output to program
output voltage.
Output voltage input to the controller. Additionally may be used to by pass LDO to supply VDD directly.
Bias for internal logic circuitry and gate drivers. Connect to external 5V power supply or configure
the internal LDO for 5 V.
Analog ground
Feedback input for internal LDO. Connect to an external resistor divider from VDD to AGND to program
LDO output.
Power stage input (HS FET Drain)
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Connect to an external capacitor to AGND to program softstart ramp
Bootstrap pin. A capacitor is connected between BST and LX to provide HS driver voltage.
Not internally connected
Switching node (HS FET Source and LS FET Drain)
Not internally connected
Power ground (LS FET Source)
Open-drain power good indicator. Externally pull-up resistor is required.
Connect to an external resistor between ILIM and LX to program over current limit
Tri-state pin. Pull low to AGND to disable the regulator. Float to enable forced continuous current
mode. Pull high to VDD to enable power save mode.
Connect to an external resistor to AGND program on-time
Enable input for internal LDO. Pull down to AGND to disable internal LDO.
ORDERING INFORMATION
Part Number
SiC403CD-T1-GE3
SiC403DB
Package
MLPQ55-32
Evaluation board
www.vishay.com
Document Number: 66550
2 S11-1638-Rev. B, 15-Aug-11
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/


Part Number SIC403
Description microBUCK SiC403
Maker Vishay Siliconix
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SIC403 Datasheet PDF






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