LTC2905 datasheet(10/16 Pages) LINER

Part #	LTC2905

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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10

LTC2903-1

29031f a

APPLICATIO S I FOR ATIO

Triple Adjustable Options (LTC2903-D1, LTC2903-E1)

LTC2903-D1 and LTC2903-E1 provide 3 adjustable in-

puts: V2, V3 and V4. The V1 threshold is 3.086V (3.3V,

5%) for option D1 and 4.675 (5V, 5%) for option E1. For

each supply monitored by an adjustable input, connect an

external resistor divider (R1 and R2) between the positive

voltage being sensed and ground. The tap point for each

divider is then connected to each adjustable input. All

adjustable inputs are compared to an internal 0.5V

reference.

Figure 3 shows how each adjustable input is configured.

Calculate the trip voltage from:

VV

R

TRIP =+

⎛

⎝

⎜

⎞

⎠

⎟

05

1

2

.

Figure 3. Setting the Positive Adjustable Trip Point

V1 (V)

0

0.1

0.3

0.4

0.5

0.7

0.1

0.5

0.7

29031 F02

0.2

0.6

0.4

0.9 1.0

0.2 0.3

0.6

0.8

TA = 25°C

V1 ONLY

COMPETITION

PART

V1 = V2 = V3

–

+

0.5V

29031 F03

V4

VTRIP

R1

LTC2903-A1

R2

+

–

Figure 2. RST Output Voltage with a 10k Pull-Up to V1

(Enlarged Area of Detail)

current sinking ability for single supply and triple supply-

tracking applications. Figure 2 shows a detailed view of the

reset pin voltage with a 10k pull-up resistor to V1.

The LTC2903-1 supervisors derive their internal supply

voltage (VCC) automatically from the greater voltage on the

V1 and V2 inputs (VCC = V1 for options D1 and E1). With

all supply inputs above threshold, the quiescent current

drawn from VCC is 20µA (typ).

Supply Monitoring

The LTC2903-1 accurately monitors four inputs in a small

6-lead SOT-23 package. The low voltage reset output

includes an integrated 200ms reset delay timer. The reset

line pulls high 200ms after all voltage inputs exceed their

respective thresholds. The reset output remains low dur-

ing power-up, power-down and brownout conditions on

any of the voltage inputs.

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