RC2951(1997) データシートの表示（PDF） - Fairchild Semiconductor

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RC2951
(Rev.:1997)

Adjustable Micropower Voltage Regulator

Fairchild Semiconductor 

PRODUCT SPECIFICATION

Typical Applications (continued)

39kΩ

RESET

8

2

+VIN SENSE

5

1

ERROR VOUT

RC2951

–

*C4

3

SD

7

FB

+

GND VTAP

39kΩ

4

6

+VOUT = 5V

+

1µF

+ 6V

100

Lead-Acid 1% kΩ

–

Battery

C1

+

C1-C4

LP339

1% 1kΩ

–

C2

+

1% 1kΩ

–

C3

+

10kΩ

R3

1% 20kΩ

100kΩ

< 5.8V**

100kΩ

< 6.0V**

100kΩ

< 6.2V**

*Optional Latch off when drop out occurs. Adjust R3 for C2 Switching when Vin is 6.0V.

**Outputs go low whenVin drops below designated thresholds.

Figure 12. Regulator with State-of-Charge Indicator

For values shown, Regulator shuts down when Vin < 5.5V and turns on again at 6.0V. Current drain in disconnected mode is ≈ 150 µA.

6V

+ Sealed

Lead-Acid

Battery

Source

≈ 400kΩ*

for 5.5V

120kΩ

1.5kΩ**

+

FB LM385

–

100kΩ

1N457

8

+VIN

1

VOUT

3

SD

RC2951

2

SENSE

7

FB

GND VTAP

4

6

+

1µF

*Sets disconnect Voltage

**Sets disconnect Hysteresis

Figure 13. Low Battery Disconnect

Main V+

Memory V+

20Ω

+

Ni-cad

Backup

Battery

2950-14

RC2951

9

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