Current

Limit

Thermal

Shutdown

V

REF

1.225 V

UVLO

30

µA

EN1

OUT1

IN

Current

Limit

OUT2

NR

EN2

250 k

Ω

Quickstart

5 pF

TPS712xx

Fixed/Fixed

30

µA

V

REF

1.225 V

UVLO

EN1

OUT1

IN

OUT2

FB1

FB2

NR

EN2

250 k

Ω

Quickstart

5 pF

TPS712xx

Adj/Adj

Current

Limit

Thermal

Shutdown

Current

Limit

90 k

Ω

90 k

Ω

TPS71202, TPS71219

TPS71229, TPS71247

TPS71256, TPS71257

SBVS049D – MAY 2004 – REVISED AUGUST 2010

www.ti.com

FUNCTIONAL BLOCK DIAGRAM —

FUNCTIONAL BLOCK DIAGRAM —

FIXED VERSION

ADJUSTABLE VERSION

Table 1. TERMINAL FUNCTIONS

TERMINAL

DESCRIPTION

NAME

DRC

IN

1

Unregulated input supply. A small 0.1 mF capacitor should be connected from IN to GND.

GND

5, Pad

Ground

Output of the regulator. A small 2.2 mF ceramic capacitor is required from this pin to ground to assure

OUT1

3

stability.

OUT2

4

Same as OUT1 but for LDO2.

Driving the enable pin (EN) high turns on LDO1. Driving this pin low puts LDO1 into shutdown mode,

EN1

10

reducing operating current. The enable pin should be connected to IN if not used.

EN2

8

Same as EN1 but controls LDO2.

FB1/NC

9

Feedback for CH1 adjustable version; no connection for non-adjustable CH1.

FB2/NC

7

Feedback for CH2 adjustable version; no connection for non-adjustable CH2.

NR

6

Noise reduction pin; connect an external bypass capacitor to reduce LDO output noise.

NC

2

No connection.

4

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