LMK212BJ105KG 데이터 시트보기 (PDF) - AUK -> KODENSHI CORP

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LMK212BJ105KG

Low Drop Output Voltage Regulator

AUK -> KODENSHI CORP 

Electrical Characteristic Curves (Cont.)

Fig. 7.

Fig. 8

S52xxM

Shutdown (Dis/Enable) Operation

The S52xxM output can be turned off by applying 0.4V or less to the device’s Dis/Enable

pin (pin3). In shutdown mode, the S52xxM draws less than 1uA quiescent current. The

output of the S52xxM is enabled by applying 1.5V to 13V at the Dis/Enable pin. In

applications were the S52xxM output will always remain enabled, the Dis/Enable pin may

be connected to Vin(pin1). The S52xxM’s shutdown circuitry includes hysteresis, as such

the device will operate properly even if a slow moving signal is applied to the Dis/Enable

pin. The device’s shutdown pin includes a 2MΩ internal pull down resistor connected to

ground.

Short Circuit Protection

The S52xxM output can withstand momentary short circuit to ground. Moreover, the

regulator can deliver very high output peak current due to its 1A instantaneous short circuit

current capability.

Noise Bypass Capacitor

In low noise applications, the self noise of the S52xxM can be decreased further by

connecting a capacitor from the noise bypass pin (pin4) to ground (pin2). The noise bypass

pin is a high impedance node as such care should be taken in printed circuit board layout to

avoid noise pick-up from external sources. Moreover, the noise bypass capacitor should

have low leakage. Noise bypass capacitors with a value as low as 470pF may be used.

However, for optimum performance, use a 0.01uF or larger, ceramic chip capacitor. Note

that the turn on and turn off response of the S52xxM is inversely proportional to the value

of the noise bypass capacitor. For fast turn on and turn off, use a small value noise Bypass

capacitor. In applications were exceptionally low output noise is not required, consider

omitting the noise Bypass capacitor altogether.

KSI-2012-006

5

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