2951CM.pdf

150mA ADJUSTABLE

VOLTAGE REGULATOR

LP2951

March 17, 1998

TEL:805-498-2111 FAX:805-498-3804 WEB:http://www.semtech.com

DESCRIPTION

The LP2951 series of low power voltage regulators

have low quiescent current and low dropout voltage.

The quiescent current increases minimally during

dropout conditions thereby extending battery life.

FEATURES

• =

Guaranteed 150mA current

• =

Adjustable output voltage - 1.24V to 29V

• =

Accurate 5V or 3.3V output @ 100mA

• =

Low dropout voltage - 350-400mV @ 100mA

• =

Regulator or reference functions

Available in the 8 lead SOIC package, the LP2951 se-

ries includes features such as shutdown and low out-

put voltage detect (typically due to low battery condi-

tions). This function may also be used as a power on

reset function when triggered by CMOS or TTL inputs.

The circuit can be used as a fixed voltage 5 volt (3.3

volt for LP2951CM-3.3) regulator or adjusted between

1.24 volts and 29 volts using external resistor pairs.

• =

Direct replacement for LP2951C, MIC2951-03,

AS2951C

APPLICATIONS

• =

Microcontroller supplies

• =

Linear regulators

• =

Adjustable Supplies

• =

Switching power supplies - post-regulation

• =

Portable modems

• =

Battery powered systems

BLOCK DIAGRAM

• =

Cellular telephones

• =

Voltage references

ORDERING INFORMATION

DEVICE (1)(2)

OUTPUT

PACKAGE

LP2951CM-X.X

ADJ

SO-8

Notes:

(1) Where -X.X denotes voltage options. Available

voltages are: 3.3V (-3.3) and 5V (leave blank).

(2) Add suffix ‘TR’ for tape and reel.

ABSOLUTE MAXIMUM RATINGS

Parameter

Symbol Maximum Units

PIN CONFIGURATION

Supply Voltage

V IN

-0.3 to 30

Shutdown Input

Voltage

-0.3 to 30

Error Comp. Output

Voltage

-0.3 to 30

Power Dissipation

P D

Internally

Limited

Thermal Resistance

Junction to Ambient

175

°C/W

Operating Junction

Temperature Range

T J

-40 to 125

°C

Storage

Temperature Range

T STG

-65 to 150

°C

Lead Temperature

(Soldering) 5 Sec

T LEAD

260

°C

652 MITCHELL ROAD NEWBURY PARK CA 91320

150mA ADJUSTABLE

VOLTAGE REGULATOR

LP2951

March 17, 1998

ELECTRICAL CHARACTERISTICS

Unless specified, limits are over operating temperature range (T J = T A ), V IN = V OUT(NOM) + 1V, I L =100µA, C L =1µF

Parameter

Symbol

Conditions

Min

Typ

Max

Units

Output Voltage

LP2951CM

V OUT

T J = 25°C, I L = 100µA

4.950 5.000 5.050

LP2951CM-3.3

3.267 3.300 3.333

Temp Coefficient (1)

T C

0°C

T J

≤ =

70°C

120

ppm/°C

Line Regulation

REG (LINE)

(V O(NOM) + 1V)

V IN = ≤ =

30V

0.1

0.5

Load Regulation

REG (LOAD)

100µA

I L = ≤ =

100mA

0.1

0.4

Dropout Voltage

V D

I L = = =

100µA

150

I L = = =

100mA

380

600

Ground Current

I GND

I L = = =

100µA

120

160

µA

I L = = =

100mA

Dropout Ground Current

I GND(D)

V IN = (V O(NOM) - 0.5V), I L = = =

100µA

110

250

µA

Current Limit

I CL

V OUT = 0

200

250

Reference Voltage

V REF

V REF ≤

V OUT ≤

(V IN - 1V), T J =

25°C,

1.210 1.235 1.260

100µA

I L = ≤ =

100mA

Feedback Bias Current

I FB

Error Comparator

Output High Leakage

Current

V OH = 30V

µA

Output Low Voltage

V IN = (V O(NOM) - 0.5V), I OL = 400µA

150

400

Threshold Voltage

Upper

Lower

140

Hysteresis

Shutdown Input

Input Logic Voltage

V SD

Low

0.6

High

2.0

Input Current

I SD

V SHUTDOWN = 2.4V

100

µA

V SHUTDOWN = 30V

750

Regulator Shutdown

Output Current

I O(SD)

30V,

V OUT = 0, Feedback pin to Tap

2V, V IN

µA

NOTE:

(1) Temperature coefficient is defined as the worst case voltage change divided by total temperature range.

652 MITCHELL ROAD NEWBURY PARK CA 91320

V SHUTDOWN

150mA ADJUSTABLE

VOLTAGE REGULATOR

LP2951

March 17, 1998

OUTLINE DRAWING SO-8

LAND PATTERN SO-8

652 MITCHELL ROAD NEWBURY PARK CA 91320

This datasheet has been downloaded from:

www.DatasheetCatalog.com

Datasheets for electronic components.

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