SI9172DB Vishay, SI9172DB Datasheet

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SI9172DB

Manufacturer Part Number
SI9172DB
Description
Power Management Modules & Development Tools SI9172 Demo Board
Manufacturer
Vishay
Type
DC/DC Switching Converters, Regulators & Controllersr
Datasheet

Specifications of SI9172DB

Input Voltage
6.5 V
Output Voltage
1.5 V
Maximum Operating Temperature
+ 85 C
Minimum Operating Temperature
- 25 C
Product
Power Management Modules
Silicon Manufacturer
Vishay
Application Sub Type
Synchronous Buck Controller
Kit Application Type
Power Management - Voltage Regulator
Silicon Core Number
SI9172
Kit Contents
Board
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
For Use With/related Products
Si9172
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
The Si9172 is a dual-mode power adjustable output converter.
When it is set to PSM mode, the Si9172 operates as a pulse-
skipping-modulation controlled step-down (buck) converter
with a dynamically adjustable output of 1.5 V to 3.6 V. It has an
integrated MOSFET, capable of supplying a minimum 170-mA
load current with a 1.5-mH inductor. The output voltage is
adjusted by the analog dc signal at the ADJ pin. The typical
conversion efficiency is above 90%. A logic high at the
BP/PSM pin puts the Si9172 in bypass mode. The main PMOS
buck switch is forced to turn on at 100% duty cycle, overriding
the FB signal. The voltage differential between input and
Document Number: 71379
S-02890—Rev. A, 21–Dec-00
D 2.7-V to 6-V Input Voltage Range
D Dynamic Adjustable 1.5-V to 3.6-V Output.
D Power Conversion Efficiency of 95% at 170-mA Load
D Selectable Pulse Skipping Modulation (PSM) or
D Bypass for up to 800-mA Load
D Integrated MOSFET with Low External Part Count
D Low Quiescent Current–110 mA/250 mA (BP/PSM)
D Shutdown Current <1 mA
D Integrated UVLO and POR
D Integrated Soft-Start
Bypass Mode (BP) Operation
PSM Buck Converter with Dynamic Adjustable Output and
3.6 V
1.5 V
V
OUT
0.4 V
ON/OFF
BP/PSM
V
IN
2.5 V
V
ADJ
Bypass Capability
2
3
4
5
1
New Product
V
V
ENABLE
BP/PSM
ADJ
IN
IN
SI9172
MSOP-10
output is the resistive voltage drop on the internal PMOS and
the inductor. The Si9172 guarantees to deliver 800-mA load in
bypass mode with a typical 95% efficiency.
The Si9172 is available in MSOP-10 package. In order to
satisfy the stringent ambient temperature requirements, the
Si9172 is rated to handle the industrial temperature range of
–25_C to 85_C.
D Over Temperature Protection
D MSOP-10 Package
D Cellular Phones, Cordless Phones
D Computer Point of Use, Notebook
D PDAs
D Battery Powered Devices
GND
REF
L
L
F
X
X
B
10
9
8
7
6
Vishay Siliconix
V
OUT
www.vishay.com
Si9172
1

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SI9172DB Summary of contents

Page 1

... The Si9172 is available in MSOP-10 package. In order to satisfy the stringent ambient temperature requirements, the Si9172 is rated to handle the industrial temperature range of –25_C to 85_C GND SI9172 3 F ENABLE B 4 BP/PSM REF 5 ADJ MSOP-10 V ADJ Si9172 Vishay Siliconix OUT www.vishay.com 1 ...

Page 2

... Si9172 Vishay Siliconix BP/PSM, ENABLE ADJ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Peak Output Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Continuous Output Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Storage Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Operating Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability ...

Page 3

... Inductor connection node Document Number: 71379 S-02890—Rev. A, 21–Dec-00 New Product Part Number GND 8 Si9172BH- REF 6 Eval Kit Si9172DB Function 90% V OUT DELAY SS FIGURE 1. Si9172 Vishay Siliconix Temperature Range Package _ _ –25_C to 85_C Tape and Reel Temperature Range Board Type Surface Mount – ...

Page 4

... Si9172 Vishay Siliconix V IN Reference Generator REF BP/PSM ENABLE ADJ + – FB 1.1 V www.vishay.com 4 New Product UVLO POR BP PSM/BP Controller PSM Driver V ADJ Turn-On Zero Current Control Detect Turn off Control Peak Current Comparater GND – + – 0.3 A Document Number: 71379 S-02890—Rev. A, 21–Dec-00 ...

Page 5

... The Si9172 includes an over temperature protection circuit to prevent thermal runaway in the MOSFET switch. If the temperature reaches 165_C, an internal soft-start capacitor is discharged, shutting down the output stage. The converter remains in the disabled mode until the temperature in the IC decreases below 140_C. Si9172 Vishay Siliconix REF pin voltage of IN www.vishay.com 5 ...

Page 6

... Si9172 Vishay Siliconix V Current vs 220 PSM Mode 200 180 160 140 120 100 Voltage ( vs. V DS(on) 220 85_C 180 25_C 140 –25_C 100 (V) IN www.vishay.com 6 New Product _ Voltage 3.6 2.9 2.2 BP Mode 1 100 Threshold vs. ADJ Voltage 0.4 1.1 1.8 ADJ (V) PSM Mode Efficiency vs. Load ...

Page 7

... Vishay disclaims any and all liability arising out of the use or application of any product described herein or of any information provided herein to the maximum extent permitted by law. The product specifications do not expand or otherwise modify Vishay’ ...

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