SI91861 datasheet(6/7 Pages) VISHAY

Part #	SI91861

Description	400-mA Smart Regulator for Network Interface Card

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Manufacturer	VISHAY [Vishay Siliconix]

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Si91861

Vishay Siliconix

www.vishay.com

6

Document Number: 71637

S-40702—Rev. B, 19-Apr-04

TYPICAL WAVEFORMS

5 VIN Power Down (3.3 VAUX = 3.3 V)

5 VIN Power Up (3.3 VAUX = 3.3 V)

M 5.00 ms

3.3 VAUX = 3.3 V

IOUT = 400 mA

3.3 VAUX = 3.3 V

IOUT = 400 mA

3.3 VOUT (100 mV/div)

5 VIN (2 V/div)

3.3 VOUT (10 mV/div)

5 VIN (1 V/div)

3.3 VOUT (10 mV/div)

10

1 K

100 K

1 M

10 K

1

0

−20

−40

−80

100

−60

200 mV/div (offset = 3.3 V)

500 mV/div (offset = 4.2 V)

200 mV/div (offset = 3.3 V)

500 mV/div (offset = 4.3 V)

M 5.00 ms

5 VIN = 4.5 to 5.5 V

IOUT = 150 mA

TRISE = 5 µsec

5 VIN = 5.5 to 4.5 V

IOUT = 150 mA

TTALL = 5 µsec

Line Transient −1 (5 VIN)

Line Transient −2 (5 VIN )

Power Supply Ripple Rejection vs. Frequency

Frequency (Hz)

−70

−50

−30

−10

5 VIN

3.3 VAUX

5 VIN = 5.0 V)

ILOAD = 150 mA

3.3 VAUX

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