4 Pin Configuration and Functions

SHUTDOWN

3

6

VTAP

GND

4

5

ERROR

OUTPUT

1

SENSE

2

8

INPUT

7

FEEDBACK

Figure 4-1. D Package (LP2951-50-Q1), 8-Pin SOIC

(Top View)

OUTPUT

SENSE

SHUTDOWN

GND

1

8

2

Thermal

7

3

6

4

5

INPUT

FEEDBACK

V

TAP

ERROR

Figure 4-2. DRG Package, 8-Pin WSON With

Exposed Thermal Pad (Top View)

Table 4-1. Pin Functions

PIN

TYPE(1)

DESCRIPTION

NAME

NO.

ERROR

5

O

Active-low, open-drain error output. Goes low when VOUT drops by 6% of the

nominal value.

FEEDBACK

7

I

Determines the output voltage. Connect to VTAP (with OUTPUT tied to SENSE)

for fixed output option, or connect to a resistor divider for adjustable output

option.

GND

4

—

Ground

INPUT

8

I

Input supply pin. Use a capacitor with a value of 1µF or larger from this pin

to ground is recommended. See the Input and Output Capacitor Requirements

section for more information.

OUTPUT

1

O

A capacitor is required from OUTPUT to GND for stability. For best transient

response, use the nominal recommended value or larger ceramic capacitor from

OUTPUT to GND(2). Place the output capacitor as close to the device output

as possible. See the Input and Output Capacitor Requirements section for more

details.

SENSE

2

I

Senses the output voltage. Connect to OUTPUT (with FEEDBACK tied to VTAP)

for fixed output option only. If using the device as adjustable output, this pin must

be left floating.

SHUTDOWN

3

I

Active-high input. A high signal disables the device; a low signal enables the

device.

VTAP

6

O

Connect to FEEDBACK for fixed output option. If using the device as adjustable

output, this pin must be left floating.

(1)

I = Input, O = Output.

(2)

The nominal output capacitance must be greater than 1μF. Throughout this document, the nominal derating on these capacitors is

assumed to be 50%. Verify that the effective capacitance at the pin is greater than 1μF.

www.ti.com

LP2951-Q1

SLVSAW6H – JUNE 2011 – REVISED NOVEMBER 2024

Copyright © 2024 Texas Instruments Incorporated

Submit Document Feedback

3

Product Folder Links: LP2951-Q1