SW

8

BOOT

7

VDD

6

SGND

5

PGND

EN

FREQ

FB

1

2

3

4

LM2621

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SNVS033D – MAY 2004 – REVISED NOVEMBER 2015

5 Pin Configuration and Functions

DGK Package

8-Pin VSSOP

Top View

Pin Functions

PIN

TYPE(1)

DESCRIPTION

NAME

NO.

PGND

1

GND

Power Ground

EN

2

I

Active-Low Shutdown Input

FREQ

3

A

Frequency Adjust. An external resistor connected between this pin and Pin 6 (VDD) sets the switching

frequency of the LM2621.

FB

4

A

Output Voltage Feedback

SGND

5

GND

Signal Ground

VDD

6

PWR

Power Supply for Internal Circuitry

BOOT

7

PWR

Bootstrap Supply for the Gate Drive of Internal MOSFET Power Switch

SW

8

PWR

Drain of the Internal MOSFET Power Switch

(1)

I = Input, O = Output, PWR = Power, GND = Ground, A = Analog

6 Specifications

6.1 Absolute Maximum Ratings

See

(1) (2)

MIN

MAX

UNIT

SW Pin Voltage

–0.5

14.5

V

BOOT, VDD, EN and FB Pins

–0.5

10

V

FREQ Pin

100

µA

Power Dissipation (TA=25°C)

(3)

500

mW

TJmax

(3)

150

°C

Lead Temp. (Soldering, 5 sec)

260

°C

Storage temperature, Tstg

–65

150

°C

(1)

Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings

only, which do not imply functional operation of the device at these or any other conditions beyond those indicated under Recommended

Operating Conditions. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

(2)

If Military/Aerospace specified devices are required, please contact the Texas Instruments Sales Office/ Distributors for availability and

specifications.

(3)

The maximum power dissipation must be derated at elevated temperatures and is dictated by Tjmax (maximum junction temperature),

θJA (junction to ambient thermal resistance), and TA (ambient temperature). The maximum allowable power dissipation at any

temperature is Pdmax = (Tjmax - TA)/ θJA or the number given in the Absolute Maximum Ratings, whichever is lower.

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