TPS773XX中文资料德州仪器数据手册PDF规格书

Open Drain Power-On Reset With 220-ms

Delay

250-mA Low-Dropout Voltage Regulator

Available in 1.8-V, 2.5-V, 3-V, Fixed Output

and Adjustable Versions

Dropout Voltage Typically 200 mV

at 250 mA (TPS77930)

Ultralow 92-μA Quiescent Current (Typ)

8-Pin MSOP (DGK) Package

Low Noise (55 μVrms) With No Bypass

Capacitor (TPS77918)

2% Tolerance Over Specified Conditions

For Fixed-Output Versions

Fast Transient Response

Thermal Shutdown Protection

See the TPS773xx and TPS774xx Family of

Devices for Active Low Enable

description

The TPS779xx is a low-dropout regulator with

integrated power-on reset. The device is capable

of supplying 250 mA of output current with a

dropout of 200 mV (TPS77930). Quiescent

current is 92 μA at full load dropping down to 1 μA

when the device is disabled. The device is

optimized to be stable with a wide range of output

capacitors including low ESR ceramic (10 μF) or

low capacitance (1 μF) tantalum capacitors. The

device has extremely low noise output performance (55 μVrms) without using any added filter capacitors.

TPS779xx is designed to have a fast transient response for larger load current changes.

The TPS779xx is offered in 1.8-V, 2.5-V, and 3-V fixed-voltage versions and in an adjustable version

(programmable over the range of 1.5 V to 5.5 V). Output voltage tolerance is 2% over line, load, and temperature

ranges. The TPS779xx family is available in 8-pin MSOP (DGK) packages.

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 high-level input voltage. This LDO family also features

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

to less than 1 μA at TJ = 25°C.