LP2951-4.8 View Datasheet(PDF) - Micrel

Part Name

Description

View to exact match

LP2951-4.8

100mA Low-Dropout Voltage Regulator

Micrel 

LP2950/2951

OUTPUT

VOLTAGE

4.75V

*

ERROR NOT

VALID

*

NOT

VALID

INPUT

VOLTAGE

5V

1.3V

* SEE APPLICATIONS INFORMATION

Figure 1. ERROR Output Timing

Typical Applications

Micrel

100kΩ

+VIN

8

VIN

*SEE APPLICATIONS

INFORMATION

VOUT = V REF

x (1 +

R1

R2

)

VOUT

ERROR

OUTPUT

5 ERROR

VOUT 1

LLPP22995511

1.2 30V

SHUTDOWN

INPUT

3

SD

OFF

GND

ON

4

FB

7

1.23V

3.3µF

R1 100

pF

NOTE: PINS 2 AND 6 ARE LEFT OPEN

VREF

R2

Figure 2. Adjustable Regulator

+VIN

8

ERROR

OUTPUT

+VIN

5 ERROR VOUT 1 *VOUT ≈VIN

LP2951

SHUTDOWN 3

SO

INPUT

GND FB

4

7

*MINIMUM INPUT-OUTPUT VOLTAGE RANGES FROM 40mV TO 400mV,

DEPENDING ON LOAD CURRENT. CURRENT LIMIT IS TYPICALLY 160mA.

*SLEEP

INPUT

+V IN

C-MOS

GATE

870 23

47kΩ

8

+V IN

ERROR

OUTPUT

5 ERROR

VOUT 1

MLPIC2299551

SHUTDOWN 3

INPUT

SD

OFF

GND

FB

ON

4

7

470 kΩ

+V OUT

2N3906

100pF

200kΩ

1% +

100kΩ

3.3µF

1%

100kΩ

*HIGH INPUT LOWERS VOUT TO 2.5V

Wide Input Voltage Range Current Limiter

5 V Regulator with 2.5 V Sleep Function

3-44

February 1999

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