LTC2903 データシートの表示（PDF） - Linear Technology

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LTC2903

Precision Quad Supply Monitor in 6-Lead SOT-23

Linear Technology 

LTC2903-1

TYPICAL PERFOR A CE CHARACTERISTICS

RST Pull-Up Current vs V2

–90

V1, V3, V4 ABOVE THRESHOLD

–80

–70

–60

–50

–40

–30

–20

VRT25

VRT33

–10

0

0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5

V2 (V)

28031 G18

RST Pull-Up Current vs External

Pull-Down Voltage on RST

–40

–35

–30

LTC2903B, C

–25

–20

–15 LTC2903A

–10

–5

0

0 0.5 1 1.5 2 2.5 3 3.5

VRST (V)

29031 G19

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 0.1µF (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 0.1µF (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.

WU

W

TI I G DIAGRA

VX

VRTX

tUV

RST

tRST

1.5V

2903 TD

29031f

6

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