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Current

Limit

Thermal

Shutdown

V

REF

1.225 V

UVLO

30

µA

90 k

Ω

EN1

OUT1

IN

Current

Limit

OUT2

NR

EN2

250 k

Ω

Quickstart

5 pF

TPS713xx

Fixed/Fixed

FB2

RESET

0.95

× V

REF

100 ms

Delay

(V

TPS71319

TPS71334

SBVS055A – DECEMBER 2004 – REVISED JANUARY 2005

FUNCTIONAL BLOCK DIAGRAM

Table 1. TERMINAL FUNCTIONS

TERMINAL

DESCRIPTION

NAME

DRC

IN

1

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

GND

5, Pad

Ground

Output of the regulator. A small 2.2 µF 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.

NC

9

No connection.

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.

Open-drain reset output; monitors OUT2. A 10 k

Ω to 1 MΩ pull-up resistor is suitable for most

RESET

2

4