TPS77301, TPS77318, TPS77327, TPS77328, TPS77333 WITH RESET OUTPUT

TPS77401, TPS77418, TPS77427, TPS77428, TPS77433 WITH POWER GOOD OUTPUT

250-mA LDO REGULATORS WITH INTEGRATED RESET OR PG

SLVS281A – FEBRUARY 2000 – REVISED MARCH 2000

2

POST OFFICE BOX 655303

description (continued)

Because the PMOS device behaves as a low-value resistor, the dropout voltage is very low (typically 200 mV

at an output current of 250 mA for 3.3 volt option) 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 (typically 92

µA over the full range of output current, 0 mA to 250 mA). These two key

specifications yield a significant improvement in operating life for battery-powered systems.

The device is enabled when the EN pin is connected to a low-level input voltage. This LDO family also features

a sleep mode; applying a TTL high signal to EN (enable) shuts down the regulator, reducing the quiescent

current to less than 1

The TPS773xx features an integrated power-on reset, commonly used as an supply voltage supervisor (SVS),

or reset output voltage. The RESET output of the TPS773xx initiates a reset in DSP, microcomputer or

microprocessor systems at power-up and in the event of an undervoltage condition. An internal comparator in

the TPS773xx monitors the output voltage of the regulator to detect an undervoltage condition on the regulated

output voltage. When OUT reaches 95% of its regulated voltage, RESET will go to a high-impedance state after

a 220 ms delay. RESET will go to low-impedance state when OUT is pulled below 95% (i.e. over load condition)

of its regulated voltage.

For the TPS774xx, the power good terminal (PG) is an active high output, which can be used to implement a

power-on reset or a low-battery indicator. An internal comparator in the TPS774xx monitors the output voltage

of the regulator to detect an undervoltage condition on the regulated output voltage. When OUT falls below 82%

of its regulated voltage, PG will go to a low-impedance state. PG will go to a high-impedance state when OUT

is above 82% of its regulated voltage.

AVAILABLE OPTIONS

TJ

OUTPUT

VOLTAGE

(V)

PACKAGED DEVICES

J

TYP

MSOP

(DGK)

3.3

TPS77333DGK

TPS77433DGK

2.8

TPS77328DGK

TPS77428DGK

– 40

°Cto125°C

2.7

TPS77327DGK

TPS77427DGK

–40 C to 125 C

1.8

TPS77318DGK

TPS77418DGK

Adjustable

1.5 V to 5.5 V

TPS77301DGK

TPS77401DGK

The TPS77301 and TPS77401 are programmable using an external resistor divider

(see application information). The DGK package is available taped and reeled. Add

an R suffix to the device type (e.g., TPS77301DGKR).