Where:

V

OUT

R + R

1

2

³ 5

A, and

m

V

OUT

V

REF

- 1

R = R

1

2

TPS7A3301

OUT

FB

GND

C

10 F

IN

m

C

1 F

NR/SS

m

R

1

1.24 M

W

R

2

105 k

W

C

10 nF

FF

C

47 F

OUT

m

IN

EN

NR/SS

V

IN

V

15 V

-

OUT

NC

FB

NC

NC

IN

NR/SS

EN

NC

NC

GND

1

2

3

4

5

15

14

13

12

11

GND OUT

NR/SS

1

2

3

4

5

6

IN

NC

EN

FB

7

TPS7A33

SBVS169B – DECEMBER 2011 – REVISED MARCH 2012

www.ti.com

PARAMETRIC MEASUREMENT INFORMATION

TYPICAL APPLICATION CIRCUIT

Maximize PSRR Performance and Minimize RMS Noise

PIN CONFIGURATIONS

KC PACKAGE

RGW PACKAGE

TO-220-7

5-mm × 5-mm QFN-20

(TOP VIEW)

(TOP VIEW)

PIN DESCRIPTIONS

NO.

NAME

KC

DESCRIPTION

EN

1

13

This pin is the input to the control-loop error amplifier. It is used to set the output voltage of the device. It is

FB

7

3

recommended to connect a 0.01-µF capacitor from FB to OUT (as close to the device as possible) to maximize ac

performance.

GND

4

7

Ground

Input supply. A capacitor greater than or equal to 10 nF must be tied from this pin to ground to assure stability. It is

recommended to connect a 10-µF capacitor from IN to GND (as close to the device as possible) to reduce circuit

IN

3

15, 16

sensitivity to printed-circuit-board (PCB) layout, especially when long input traces or high source impedances are

encountered.

2, 4-6, 8-12,

NC

5

This pin can be left open or tied to any voltage between GND and IN.

17-19

Noise reduction pin. A capacitor connected from this pin to GND controls the soft-start function and allows RMS noise to

NR/SS

2

14

be reduced to very low levels. It is recommended to connect a 1-µF capacitor from NR/SS to GND (as close to the

device as possible) to bypass the noise generated by the internal bandgap and maximize ac performance.

Regulator output. A capacitor greater than or equal to 10 µF must be tied from this pin to ground to assure stability. It is

OUT

6

1, 20

recommended to connect a 47-µF ceramic capacitor from OUT to GND (as close to the device as possible) to maximize

ac performance.

Tab

Tab

—

TAB is internally connected to GND. An external heatsink can be installed to provide additional thermal performance.

(1)

RGW is a product-preview device.

4

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