LTC2903A datasheet(6/16 Pages) LINER

Part #	LTC2903A

Description	Precision Quad Supply Monitor in 6-Lead SOT-23

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Manufacturer	LINER [Linear Technology]

Direct Link	http://www.linear.com

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6

LTC2903-1

29031f

PI FU CTIO S

V1 (Pin 1): Voltage Input 1 (5V, 3.3V). Internal VCC is

generated from the greater voltage on the V1, V2 inputs.

Bypass this pin to ground with a 0.1

µF (or greater)

capacitor.

GND (Pin 2): Ground.

V2 (Pin 3): Voltage Input 2 (3.3V, 2.5V). Internal VCC is

generated from the greater voltage on the V1, V2 inputs.

Bypass this pin to ground with a 0.1

µF (or greater)

capacitor.

V3 (Pin 4): Voltage Input 3 (2.5V, 1.8V). This input assists

the RST pull-down circuitry below 1V.

V4 (Pin 5): Voltage Input 4 (ADJ, 1.8V, –5.2V). See Table

1 for recommended ADJ resistor values.

RST (Pin 6): Reset Logic Output. Pulls low when any volt-

age input is below reset threshold and held low for 200ms

after all voltage inputs exceed threshold. The pin contains

a weak pull-up to V2. Use an external pull-up for faster rise

times or output voltages greater than V2.

TI I G DIAGRA

VRTX

tUV

tRST

1.5V

2903 TD

VX

RST

TYPICAL PERFOR A CE CHARACTERISTICS

RST Pull-Up Current vs V2

RST Pull-Up Current vs External

Pull-Down Voltage on RST

V2 (V)

0

–50

–70

–90

4

28031 G18

–30

–10

–40

–60

–80

–20

0

1

0.5

2

1.5

3

3.5

4.5

2.5

5

VRT25

VRT33

V1, V3, V4 ABOVE THRESHOLD

VRST (V)

0

–35

1.5

29031 G19

–20

–10

0.5

1

2

–5

0

–40

–30

–25

–15

2.5

3

3.5

LTC2903B, C

LTC2903A

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LTC2903A Datasheet(PDF) 6 Page - Linear Technology

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