NCV4949APDR2G データシートの表示（PDF） - ON Semiconductor

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NCV4949APDR2G

100 mA, 5.0 V, Low Dropout Voltage Regulator with Reset and Sense

ON Semiconductor 

NCV4949A

APPLICATION INFORMATION

Supply Voltage Transient

High supply voltage transients can cause a reset output

signal perturbation. For supply voltages greater than 8.0 V

the circuit shows a high immunity of the reset output against

supply transients of more than 100 V/ms. For supply voltages

less than 8.0 V supply transients of more than 0.4 V/ms can

cause a reset signal perturbation. To improve the transient

behavior for supply voltages less than 8.0 V a capacitor at

Pin 3 can be used. A capacitor at Pin 3 (C3 ≤ 1.0 mF) also

reduces the output noise.

C3

Vout CO

CCT

VZ

(optional)

3

8

CT 4

Vbat

VCC

Preregulator

1

6.0 V

Cs

2.0 mA

RSI1

Regulator

VCC

Si

2

RSI2

CSI

1.23 Vref

Reset

+

- 2.0 V

Sense

+

- 1.23 V

5 GND

NOTE: 1. For stability: Cs ≥ 1.0 mF, CO ≥ 4.7 mF, ESR < 10 W at 10 kHz

2. Recommended for application: Cs = 10 mF, CO = 10 mF to 74 mF @ TA = 125°C

By using higher Cs it is possible to use higher CO.

Figure 14. Application Schematic

Reset

6

RReset

10 kW

Vout

RSO 10 kW

So

7

http://onsemi.com

6

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