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Vishay Intertechnology Electronic Components Datasheet

SIC417 Datasheet

28-V Integrated Buck Regulator

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SiC417
Vishay Siliconix
microBUCKTM SiC417
10-A, 28-V Integrated Buck Regulator with Programmable LDO
DESCRIPTION
The Vishay Siliconix SiC417 is an advanced stand-alone
synchronous buck regulator featuring integrated power
MOSFETs, bootstrap diode, and a programmable LDO in a
space-saving MLPQ 5 x 5 - 32 pin package.
The SiC417 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 programmable 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 SiC417 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
0.5 V to 5.5 V
200 kHz to 1 MHz
10 A
95 % at 300 kHz
MLPQ 5 mm x 5 mm
FEATURES
• High efficiency > 92 %
• Internal power MOSFETs:
High-side RDS(ON) = 27 mΩ
Low-side RDS(ON) = 9 mΩ
• Integrated bootstrap diode
• Integrated configurable 150 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
• Internal soft-start and soft-shutdown
• 1 % internal reference voltage
• Power good output and over voltage protection
• Halogen-free according to IEC 61249-2-21 definition
Compliant to RoHS directive 2002/95/EC
APPLICATIONS
• Notebook, desktop and server computers
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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
EN-PSAVE
PGOOD
EN-LDO
V5V
3
VLDO
7
12
DH
VIN
6
BST
8
2 FBL
LX
29 EN/PSV
26 PGOOD
32 ENL
PWM
Controller
13
27
ILIM
15
31 tON
AGND
30
PGND
5
FB DL VOUT
1 14
Document Number: 69062
S10-1367-Rev. D, 14-Jun-10
www.vishay.com
1
Datasheet pdf - http://www.DataSheet4U.co.kr/


Vishay Intertechnology Electronic Components Datasheet

SIC417 Datasheet

28-V Integrated Buck Regulator

No Preview Available !

SiC417
Vishay Siliconix
PIN CONFIGURATION
FB
FBL
V5V
AGND
VOUT
VIN
VLDO
BST
PAD 1
AGND 34
PAD 2
VIN 35
PAD 3
LX 33
LX
LX
PGND
PGND
PGND
PGND
PGND
PGND
PIN DESCRIPTION
Pin Number
Symbol
1 FB
2 FBL
3 V5V
4, 30, PAD 1
5
6, 9 - 11, PAD 2
7
8
AGND
VOUT
VIN
VLDO
BST
12
14
13, 23 - 25, 28,
PAD 3
15-22
26
27
29
DH
DL
LX
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 the
output voltage.
Feedback input for the LDO. Connect to an external resistor divider from VLDO to program the VLDO output.
5 V power input for internal analog circuits and gate drives. Connect to external 5 V supply or configure the
LDO for 5 V and connect to VLDO .
Analog ground.
Output voltage input to the SiC417. Additionally, may be used to bypass LDO to supply VLDO directly.
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Input supply voltage.
LDO output.
Bootstrap pin. A capacitor is connected between BST to LX to develop the floating voltage for the high-side
gate drive.
High-side gate drive - do not connect this pin.
Low-side gate drive - do not connect this pin.
Switching (Phase) node.
Power ground.
Open-drain power good indicator. High impedance indicates power is good. An external pull-up resistor is
required.
Current limit sense point - to program the current limit connect a resistor from ILIM to LX.
Tri-state pin. Enable input for switching regulator. Connect EN to AGND to disable the switching regulator.
Float pin for forced continuous and pull high for power-save mode.
On-time set input. Set the on-time by a series resistor to the input supply voltage.
Enable input for the LDO. Connect ENL to AGND to disable the LDO.
ORDERING INFORMATION
Part Number
SiC417CD-T1-E3
SiC417DB
Package
MLPQ55-32
Evaluation board
www.vishay.com
2
Document Number: 69062
S10-1367-Rev. D, 14-Jun-10
Datasheet pdf - http://www.DataSheet4U.co.kr/


Part Number SIC417
Description 28-V Integrated Buck Regulator
Maker Vishay Siliconix
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SIC417 Datasheet PDF





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