NJM2881 查看數據表（PDF） - Japan Radio Corporation

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NJM2881

LOW DROPOUT VOLTAGE REGULATOR

Japan Radio Corporation  

NJM2881/82

TYPICAL APPLICATION

1 In the case where ON/OFF Control is not required:

VIN

VIN

VOUT

0.1µF

R

(0∼300kΩ)

NJM2881/82

CONTROL

NOISE

BYPASS

GND

VOUT

1.0µF *5

Cp=0.01µF

*5 1.9V ≤ Vo ≤ 2.6V version: Co=2.2µF

Vo ≤ 1.8V version: Co=4.7µF

Connect control terminal to VIN terminal

The quiescent current can be reduced by using a resistance “R”. Instead, it increases the minimum operating

voltage. For further information, please refer to Figure “Output Voltage vs. Control Voltage”.

2 In use of ON/OFF CONTROL:

VIN

VIN

VOUT

VOUT

0.1µF

R

NJM2881/82

CONTROL

NOISE

BYPASS

GND

1.0µF *5

Cp=0.01µF

*5 1.9V ≤ Vo ≤ 2.6V version: Co=2.2µF

Vo ≤ 1.8V version: Co=4.7µF

State of control terminal:

•“H”→ output is enabled.

•“L” or “open” → output is disabled.

Noise bypass Capacitance Cp

Noise bypass capacitance Cp reduces noise generated by band-gap reference circuit.

Noise level and ripple rejection will be improved when larger Cp is used.

Use of smaller Cp value may cause oscillation.

Use the Cp value of 0.01uF greater to avoid the problem.

-4-

Ver.2004-12-22

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