LT3023 Просмотр технического описания (PDF) - Linear Technology

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LT3023

Dual 100mA,Low Dropout, Low Noise, Micropower Regulator

Linear Technology 

APPLICATIONS INFORMATION

In circuits where a backup battery is required, several

different input/output conditions can occur. The output

voltage may be held up while the input is either pulled

to ground, pulled to some intermediate voltage or is left

open circuit. Current flow back into the output will follow

the curve shown in Figure 6.

When the IN pin of the LT3023 is forced below the OUT1

or OUT2 pins or the OUT1/OUT2 pins are pulled above the

IN pin, input current will typically drop to less than 2μA.

This can happen if the input of the device is connected

to a discharged (low voltage) battery and the output is

held up by either a backup battery or a second regulator

circuit. The state of the SHDN1/SHDN2 pins will have no

effect on the reverse output current when the output is

pulled above the input.

LT3023

100

TA = 25°C

90 VIN = 0V

80

VOUT = VADJ

CURRENT FLOWS

760 INTO OUTPUT PIN

60

50

40

30

20

10

0

01234567 8

OUTPUT VOLTAGE (V)

9 10

3023 F06

Figure 6. Reverse Output Current

TYPICAL APPLICATIONS

Noise Bypassing Slows Startup, Allows Outputs to Track

VIN

3.7V TO 20V

1μF

OFF ON

IN

OUT1

BYP1

ADJ1

LT3023

SHDN1 OUT2

SHDN2 BYP2

ADJ2

GND

0.01μF

10μF

422k

249k

0.01μF

10μF

261k

249k

3.3V

AT 100mA

2.5V

AT 100mA

3023 TA02a

VSHDN1/SHDN2

1V/DIV

VOUT1

1V/DIV

VOUT2

1V/DIV

100

10

1

2ms/DIV

3023 TA02b

Startup Time

0.1

10

100

1000

CBYP (pF)

10000

3023 TA02c

3023fa

13

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