TPS70845, TPS70848, TPS70851, TPS70858, TPS70802

DUAL-OUTPUT LOW-DROPOUT VOLTAGE REGULATORS

WITH INTEGRATED SVS FOR SPLIT VOLTAGE SYSTEMS

SLVS301B – JUNE 2000 – REVISED OCTOBER 2002

2

POST OFFICE BOX 655303

description (continued)

The TPS708xx family of voltage regulators offers very low dropout voltage and dual outputs. These devices

have extremely low noise output performance without using any added filter bypass capacitors and are

designed to have a fast transient response and be stable with 10

µF low ESR capacitors.

These devices have fixed 3.3-V/2.5-V, 3.3-V/1.8-V, 3.3-V/1.5-V, 3.3-V/1.2-V, and adjustable voltage options.

Regulator 1 can support up to 250 mA, and regulator 2 can support up to 125 mA. Separate voltage inputs allow

the designer to configure the source power.

Because the PMOS device behaves as a low-value resistor, the dropout voltage is very low (typically 170 mV

on regulator 1) and is directly proportional to the output current. Additionally, since the PMOS pass element is

a voltage-driven device, the quiescent current is very low and independent of output loading (maximum of

230

µA over the full range of output current and full range of temperature). This LDO family also features a sleep

mode; applying a high signal to EN1 or EN2 (enable) shuts down regulator 1 or regulator 2, respectively. When

a high signal is applied to both EN1 and EN2, both regulators are in sleep mode, thereby reducing the input

current to 2

For each regulator, there is an internal discharge transistor to discharge the output capacitor when the regulator

is turned off (disabled).

POR, or power on reset) for the circuitry supplied by regulator 1. The PG2 pin reports the voltage conditions

regulator 2.

The TPS708xx features a RESET (SVS, POR, or power on reset). RESET output initiates a reset in the event

of an undervoltage condition. RESET also indicates the status of the manual reset pin (MR). When MR is in the

The device has an undervoltage lockout UVLO circuit which prevents the internal regulators from turning on until

AVAILABLE OPTIONS

TJ

REGULATOR 1

VO (V)

REGULATOR 2

VO (V)

TSSOP

(PWP)

3.3 V

1.2 V

TPS70845PWP

3.3 V

1.5 V

TPS70848PWP

– 40

°Cto125°C

3.3 V

1.8 V

TPS70851PWP

– 40

°C to 125°C

3.3 V

2.5 V

TPS70858PWP

Adjustable

(1.22 V to 5.5 V)

Adjustable

(1.22 V to 5.5 V)

TPS70802PWP

NOTE: The TPS70802 is programmable using external resistor dividers (see

application information) The PWP package is available taped and reeled. Add

an R suffix to the device type (e.g., TPS70802PWPR).