1

V+

15

IQSET

2

NC

14

TFLAG

3

NC

13

IFLAG

4

NC

12

ILIM

5

NC

11

EN

Not to scale

Thermal

Pad

3

OPA521

www.ti.com

SBOS872 – MAY 2018

Product Folder Links: OPA521

Submit Documentation Feedback

Copyright © 2018, Texas Instruments Incorporated

5 Pin Configuration and Functions

RGW Package

20-Pin VQFN With Exposed Thermal Pad

Top View

NC - no internal connection

Pin Functions

PIN

I/O

DESCRIPTION

NAME

NO.

EN

11

I

Enables the amplifier (active high, high enables the OPA521)

GAIN_SET

8

I

Connect an external resistor to Gain_Set and -IN to increase the gain above -7 V/V

GND

16, 17

—

Ground

IFLAG

13

O

Current limit warning flag (open-drain, active high, high signifies current limit condition)

ILIM

12

I

Resistor programmable current limit

+IN

9

I

Non-inverting input (connect to a voltage equal to (V+)/2)

–IN

7

I

Inverting input for closed loop gain = –7 V/V

IQSET

15

I

Quiescent current select (active high, high configures the OPA521 to operate in FCC/ARIB

bands, low configures the OPA521 to operate in CENELEC Bands A, B, C, D)

NC

2, 3, 4, 5, 6,

10

—

No internal connection

TFLAG

14

O

Thermal limit warning flag (open-drain, active high, high signifies thermal limit condition)

V+

1, 20

—

Positive power supply

VOUT

18. 19

O

Output

Thermal pad

—

Must be soldered to PCB and connected to GND