LP2951CS-X 查看數據表（PDF） - Advanced Monolithic Systems Inc

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LP2951CS-X

100mA LOW DROPOUT VOLTAGE REGULATOR

Advanced Monolithic Systems Inc 

APPLICATION HINTS (Continued)

OUTPUT

VOLTAGE

4.75V

ERROR*

INPUT

VOLTAGE

5V

1.3V

FIGURE 1. ERROR Output Timing

*When VIN 1.3V the error flag pin becomes a high impedance,

and the error flag voltage rises to its pull-up voltage. Using Vout

as the pull-up voltage (see Figure 2), rather than an external 5V

source, will keep the error flag voltage under 1.2V (typ.) in this

condition. The user may wish to drive down the error flag

voltage using equal value resistors (10 k suggested), to ensure

a low-level logic signal during any fault condition, while still

allowing a valid high logic level during normal operation.

LP2950/LP2951

+VIN

ERROR

OUPUT

100k

8

+VIN

5 ERROR*

VOUT 1

**SHUTDOWN

INPUT

3

SD

LP2951

GND

FB

4

7 1.23V

VOUT

1.2 30V

R1

*+

.01

3.3µF

µF

VREF

R2

FIGURE 2. Adjustable Regulator

*See Application Hints.

Vout = VREF × (1 + R1/ R2)

**Drive with TTL- high to shut down. Ground or leave if shutdown

feature is not used.

Note: Pins 2 and 6 are left open.

TYPICAL APPLICATIONS

300 mA Regulator with 0.75 Dropout

UNREGULATED

INPUT

8

IN

1

OUT

330 Ω

LP2951

27kΩ

6 VTAP

FB

7

SENSE 2

GND

4

4.7µ F

2N5432 (2)

5V OUTPUT

LOAD

50mA TO

300mA

Wide Input Voltage Range Current Limiter

+VIN

8

ERROR

OUPUT

+VIN

5 ERROR

VOUT 1

LP2951

SHUTDOWN

INPUT

3

SD

GND

FB

4

7

*VOUT ≈ VΙΝ

*Minimum Input-Output voltage ranges from 40mV to 400mV, depending on load

current. Current limit is typically 160 mA

Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140

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