TPS70445, TPS70448, TPS70451, TPS70458, TPS70402

DUAL-OUTPUT LOW-DROPOUT VOLTAGE REGULATORS

WITH INTEGRATED SVS FOR SPLIT VOLTAGE SYSTEMS

SLVS307B – SEPTEMBER 2000 – REVISED APRIL 2003

2

POST OFFICE BOX 655303

description (continued)

The TPS704xx 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 47

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 1 A, and regulator 2 can support up to 2 A. Separate voltage inputs allow the

designer to configure the source power.

Because the PMOS pass element behaves as a low-value resistor, the dropout voltage is very low (typically 160

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

250

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

2.

The TPS704xx features a RESET (SVS, POR, or power on reset). RESET is an active low, open drain output

and requires a pullup resistor for normal operation. When pulled up, RESET goes into a high impedance state

undervoltage condition. Second, the manual reset (MR) pin must be in a high impedance state. To monitor

to MR. RESET can be used to drive power on reset or a low-battery indicator. If RESET is not used, it can be

left floating.

undervoltage lockout circuit that prevents each output from turning on until the respective input reaches 2.5 V.

AVAILABLE OPTIONS

TJ

REGULATOR 1

VO (V)

REGULATOR 2

VO (V)

TSSOP

(PWP)

3.3 V

1.2 V

TPS70445PWP

3.3 V

1.5 V

TPS70448PWP

– 40

°Cto125°C

3.3 V

1.8 V

TPS70451PWP

– 40

°C to 125°C

3.3 V

2.5 V

TPS70458PWP

Adjustable

(1.22 V to 5.5 V)

Adjustable

(1.22 V to 5.5 V)

TPS70402PWP

NOTE: The TPS70402 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., TPS70402PWPR).