Texas Instruments LP2950 Bedienungsanleitung

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LP295x 100-mA, 30-V, adjustable voltage regulator with shutdown

1 Features

•Wide input voltage range

–V

IN

range : 2V to 30V

•Wide output voltage range V

OUT

–Fixed option: 3V (legacy Chip), 3.3V, 5.0V

–Adjustable option: 1.2V to 29V

•Output current: 100mA

•V

OUT

accuracy:

–±2% over line, load, and temperature (legacy

chip)

–±1% over line, load, and temperature (new

chip)

•Quiescent current I

Q

(new chip): 50μA (typical)

•Low dropout (new chip):: 340mV (typical)

•Output current limiting and thermal shutdown

•Stable over a wide range of ceramic output

capacitor values

–C

OUT

range: 1μF to 100μF (new chip)

–ESR range: 0 to 2Ω (new chip)

•Operating junction temperature: –40°C to 125°C

•Package option:

–LP (3-pin TO-92)

–D (8-pin SOIC)

–DRG (8-pin WSON)

2 Applications

•Grid Infrastructure

•Factory Automation

•Motor Drives

•Building Automation

3 Description

The LP2951 is a wide input low-dropout regulator

(LDO) supporting an input voltage range from 2V to

30V and can supply up to 100mA of load current. The

LP2951 is able to output either a fixed or adjustable

output from the same device. By tying the OUTPUT

and SENSE pins together, and the FEEDBACK and

V

TAP

pins together, the LP2951 gives 3.3V or 5V

fixed output voltages. Alternatively, leave the SENSE

and V

TAP

pins open and connect FEEDBACK to an

external resistor divider. This configuration allows the

output to be set to any value between 1.2V to 29V.

The LP2951-Q1 has a ERROR output that monitors

the voltage at the feedback pin to indicate the status

of the output voltage. The SHUTDOWN input and

ERROR output are used for sequencing multiple

power supplies in the system.

Package Information

PART

NUMBER

PACKAGE

(1)

PACKAGE SIZE

(2)

LP2950LP (TO-92, 3)4.83mm × 4.83mm

LP2951D (SOIC, 8)4.90mm x 6.00mm

DRG (SON, 8)3.00mm x 3.00mm

(1)For all available packages, see the orderable addendum at

the end of the data sheet.

(2)The package size (length × width) is a nominal value and

includes pins, where applicable.

-30

0

306090

120150

T

A

-

Temperature

-

°C

50

100

150

200

250

300

350

400

450

500

(V

IN

-

V

OUT

)

-

Dropout

Voltage

-mV

50mA

100mA

V

IN

= 4.9V

Figure 3-1. Dropout Voltage vs Temperature (New

Chip)

LP2951

Load

V

BAT

FB

1µF

1µF

OUTPUT

1

3

4

8

7

6

5

SENSE

SHUTDOWN

330K



INPUT

FEEDBACK

V

TAP

ERROR

2

Typical Application Circuit

LP2950, LP2951

SLVS582K – APRIL 2006 – REVISED DECEMBER 2024

An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. PRODUCTION DATA.

Produktspezifikationen