SI91860DB Vishay, SI91860DB Datasheet

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SI91860DB

Manufacturer Part Number
SI91860DB
Description
Low Dropout (LDO) Regulators SI91860 Demo Board
Manufacturer
Vishay
Datasheet
1.SI9177BH-T1.pdf (8 pages)

Specifications of SI91860DB

Number Of Outputs
1
Polarity
Positive
Input Voltage Max
6 V
Output Voltage
3.3 V
Output Type
Fixed
Dropout Voltage (max)
0.055 V at 150 mA
Output Current
400 mA
Line Regulation
10 mV
Load Regulation
20 mV
Maximum Power Dissipation
2 W
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
Package / Case
SOIC-8
Minimum Operating Temperature
- 40 C
Lead Free Status / Rohs Status
Not Compliant
DESCRIPTION
The Si91860 provides a constant 3.3-V output with multiple
inputs. This function is required in many power interface
applications, such as the Network Interface Card (NIC). The
Si91860 is offered in small SOIC-8 package with up to 2-W
Power handling capability. The complete application circuit
uses only four external components.
The PCI Card has a 3.3-V Chipset while the PCI bus has two
independent 5-V sources. When needed, the two 5-V sources
are available from the PCI bus or directly from the
motherboard—normally
internal regulator steps down from either of the 5-V supplies
Document Number: 71340
S-40704—Rev. B, 19-Apr-04
FEATURES
D Single Fixed 3.3-V Output
D Linear Regulator for Dual Power Inputs
D Auxilliary Input Can Be Bypassed
D Automatically Switches Between Linear Regulator
D Linear Regulator: 3.3-V "3% Output at 400-mA
D Linear Regulator: 600-mA Peak Output Current
D Low Bypass Switch Drop: <55-mV Drop at 150 mA
D Built-in Short Circuit and Thermal Shutdown
FUNCTIONAL BLOCK DIAGRAM
and Bypass Mode
Current
Protection
400-mA Smart Regulator for Network Interface Card
3.3 V
5 V
5 V
5 V
GND
AUX
SB
IN
IN
and standby 5 V
SB
. The
Si91860
Regulator
Control
and
to 3.3 V. A 200-mΩ power switch is integrated to connect the
3.3-V
> 5 V
automatically by the Si91860. The power handling capability
is as such as to carry at least 400-mA continuous load current
for any power input condition.
In order to satisfy the stringent ambient temperature
requirements in many applications, the Si91860 is rated for the
industrial temperature range of −40_C to 85_C.
The Si91860 is available in both standard and lead (Pb)-free
packages.
D Low Supply Current
D SOIC-8 Package
APPLICATIONS
D Network Interface Cards (NIC)
D PCMCIA Cards
D Cardbus
D Desktop Computers/Workstations
SB
AUX
> 3.3 V
input to the output. The power drawn priority is 5 V
AUX
, where the selection is done internally and
Vishay Siliconix
3.3 V
OUT
Si91860
www.vishay.com
IN
1

SI91860DB Summary of contents

Page 1

... In order to satisfy the stringent ambient temperature requirements in many applications, the Si91860 is rated for the industrial temperature range of −40_C to 85_C. . The The Si91860 is available in both standard and lead (Pb)-free SB packages. Si91860 Regulator and Control Si91860 Vishay Siliconix IN 3.3 V OUT www.vishay.com 1 ...

Page 2

... Si91860 Vishay Siliconix ABSOLUTE MAXIMUM RATINGS Pin Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Linear Regulator Output Current (peak Bypass Output Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Maximum Junction Temperature J(max) Storage Temperature STG ESD (Human Body Model 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 ...

Page 3

... OUT 3.3 V GND 4 5 AUX Top View Name Function 5 V Secondary power input for the Regulator Primary power input for the Regulator IN 3.3 V Output 3.3 V OUT 3.3 V Power input for the bypass function AUX GND Grounds Si91860 Vishay Siliconix www.vishay.com 3 ...

Page 4

... Si91860 Vishay Siliconix Part Number Si91860DY-T1 Si91860DY-T1—E3 Si91860DY Eval Kit Si91860DB TYPICAL CHARACTERISTICS Ground Current vs Temperature ( 600 mA OUT 0 400 mA OUT 0 200 mA OUT 0 OUT 0 0.0 −40 − Temperature ( C) ON-Resistance vs 3.3 V AUX 0.35 0.30 0.25 0.20 0.15 0.10 3.0 3.1 3.2 3 ...

Page 5

... OUT M 5. mV/div OUT I = 200 mA/div OUT M 5. 200 mV/div (offset = 5 V) 3.3 V (100 mV/div) OUT 500 mV/div (offset = 4 5.00 ms Si91860 Vishay Siliconix Load Transient Response-2 Input = 5. 150 OUT msec FALL Load Transient Response-4 Input = 5. 400 OUT msec FALL ...

Page 6

... Si91860 Vishay Siliconix TYPICAL WAVEFORMS 5 V Power Down (3 3.3 V 200 mV/div (offset = 3.3 V) AUX 3.3 V (100 mV/div) OUT 500 mV/div (offset = 4 3 3.3 V AUX I = 400 mA OUT Line Transient − V/div) IN 3.3 V (10 mV/div) OUT 4 150 mA OUT µsec RISE 0 −10 − ...

Page 7

... For continuous operation, do not and 5-V pins fall exceed the junction rating of 150_C. In bypass mode, the IN SB device is not current limited. Si91860 Vishay Siliconix 3 3.3 V OUT 2.2 µF and 5-V pins fall below 4.07 V, the IN SB through a 0 ...

Page 8

... 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’ ...