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DETAILED DESCRIPTION

Pin Functions

TPS70751-EP

DUAL-OUTPUT LOW-DROPOUT VOLTAGE REGULATOR

WITH POWER-UP SEQUENCING FOR SPLIT-VOLTAGE DSP SYSTEMS

SLVS718 – DECEMBER 2006

TERMINAL FUNCTIONS

TERMINAL

I/O

DESCRIPTION

NAME

NO.

EN

6

I

Active-low enable

GND

8

Ground

MR1

4

I

Manual reset 1. Active low, pulled up internally.

MR2

5

I

Manual reset 2. Active low, pulled up internally.

NC

1, 11, 20

No connection

PG1

16

O

regulated voltage.

RESET

15

O

Reset. Open-drain output, SVS (power-on reset) signal, active low.

SEQ

7

I

up first, SEQ terminal pulled up internally.

2, 3

I

Regulator 1 input voltage

9, 10

I

Regulator 2 input voltage

18, 19

O

Regulator 1 output voltage

12, 13

O

Regulator 2 output voltage

17

I

Regulator 1 output voltage sense/feedback 1

14

I

Regulator 2 output voltage sense/feedback 2

The TPS707xx low-dropout regulator family provides dual regulated output voltages for DSP applications that

require a high-performance power-management solution. These devices provide fast transient response and

high accuracy with small output capacitors, while drawing low quiescent current. Programmable sequencing

provides a power solution for DSPs, without any external component requirements. This reduces the component

cost and board space while increasing total system reliability. The TPS707xx family has an enable feature that

puts the device in sleep mode, reducing the input currents to less than 3

µA. Other features are integrated SVS

(power-on reset, RESET) and power good (PG1) that monitor output voltages and provide logic output to the

system. These differentiated features provide a complete DSP power solution.

The TPS70751, unlike many other LDOs, features very low quiescent current that remains virtually constant

even with varying loads. Conventional LDO regulators use a PNP pass element, the base current of which is

to pass current; because the gate of the PMOS is voltage driven, operating current is low and stable over the full

load range.

Enable (EN)

The EN terminal is an input that enables or shuts down the device. If EN is at a voltage high signal, the device is

in shutdown mode. When EN goes to voltage low, the device is enabled.

Sequence (SEQ)

Figure 33 and Figure 38.

5

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