LT3060 Просмотр технического описания (PDF) - Linear Technology

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LT3060

45V VIN, Micropower, Low Noise, 100mA Low Dropout, Linear Regulator

Linear Technology 

LT3060

APPLICATIONS INFORMATION

The LT3060 incurs no damage if the ADJ pin is pulled

above or below ground by less than 50V. If the input is

left open-circuit or grounded, the ADJ pin performs like

a large resistor (typically 30k) in series with a diode when

pulled below ground and like 30k in series with two diodes

when pulled above ground.

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 left open-

circuit. Current flow back into the output follows the curve

shown in Figure 7.

If the LT3060’s IN pin is forced below the OUT pin or the

OUT pin is pulled above the IN pin, input current typically

drops to less than 1μA. This occurs if the LT3060 input is

connected to a discharged (low voltage) battery and either

a backup battery or a second regulator holds up the output.

The state of the SHDN pin has no effect on the reverse

current if the output is pulled above the input.

2.0

TJ = 25°C

1.8 VIN = 0V

1.6

CURRENT FLOWS

INTO OUT PIN

1.4 VOUT = VADJ

1.2

1.0

ADJ

0.8

0.6

0.4

0.2

0

0

OUT

5 10 15 20 25 30 35 40 45

OUTPUT VOLTAGE (V)

3060 F07

Figure 7. Reverse Output Current

3060f

16

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