DEVICE INFORMATION

FUNCTIONAL BLOCK DIAGRAMS

Thermal

Shutdown

UVLO

Current

Limit

3.3MW

Overshoot

Detect

500kW

1.208V

Bandgap

IN

EN

FB

OUT

GND

400W

Thermal

Shutdown

UVLO

Current

Limit

2 A

m

Overshoot

Detect

500kW

Quickstart

1.208V

Bandgap

(1)

IN

EN

NR

OUT

GND

400W

NOTE(1): Fixedvoltageversionsbetween1.0Vto1.2Vhavea1.0Vbandgapcircuit

insteadofa1.208Vbandgapcircuit.

PIN CONFIGURATIONS

TPS734xxDDC

TSOT23-5

(TOPVIEW)

OUT

NR

IN

GND

EN

1

2

3

5

4

TPS73401DDC

TSOT23-5

(TOPVIEW)

OUT

FB

IN

GND

EN

1

2

3

5

4

TPS734xxDRV

2mmx2mmSON-6

(TOPVIEW)

IN

N/C

EN

6

5

4

OUT

NR

GND

1

2

3

GND

TPS73401DRV

2mmx2mmSON-6

(TOPVIEW)

IN

N/C

EN

6

5

4

OUT

FB

GND

1

2

3

GND

TPS734xx

SBVS089F – DECEMBER 2007 – REVISED FEBRUARY 2009 ........................................................................................................................................ www.ti.com

Figure 1. Fixed Voltage Versions

Figure 2. Adjustable Voltage Versions

PIN DESCRIPTIONS

TPS734xx

NAME

DDC

DRV

DRB

DESCRIPTION

IN

1

6

8

Input supply.

GND

2

3, Pad

4

Ground. The pad must be tied to GND.

Driving the enable pin (EN) high turns on the regulator. Driving this pin low puts the

EN

3

4

5

regulator into shutdown mode. EN can be connected to IN if not used.

Fixed voltage versions only; connecting an external capacitor to this pin bypasses noise

NR

4

2

3

generated by the internal bandgap. This allows output noise to be reduced to very low

levels.

Adjustable version only; this is the input to the control loop error amplifier, and is used to set

FB

4

2

3

the output voltage of the device.

Output of the regulator. A small capacitor (total typical capacitance

≥ 2.0

µF ceramic) is

OUT

5

1

1

needed from this pin to ground to assure stability.

N/C

—

5

2, 6, 7

Not internally connected. This pin must either be left open, or tied to GND.

4

Submit Documentation Feedback

Copyright © 2007–2009, Texas Instruments Incorporated