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2.5-V Fixed-Output Regulator

Very Low-Dropout (LDO) Voltage . . . 57 mV

Typical at IO = 100 mA

Very Low Quiescent Current, Independent

of Load . . . 292 mA Typ

Extremely Low Sleep-State Current,

0.5 mA Max

2% Tolerance Over Specified Conditions

Output Current Range . . . 0 mA to 500 mA

Available in Space Saving 8-Pin SOIC and

20-Pin TSSOP Packages

0°C to 125°C Operating Junction

Temperature Range

description

The TPS71025 low-dropout regulator offers an

order of magnitude reduction in both dropout

voltage and quiescent current over conventional

LDO performance. The improvement results from

replacing the typical pnp pass transistor with a

PMOS device.

Because the PMOS device behaves as a low-value resistor, the dropout voltage is very low (maximum of 95 mV

at an output current of 100 mA) and is directly proportional to the output current (see Figure 1). Additionally,

since the PMOS pass element is a voltage-driven device, the quiescent current is very low and remains

independent of output loading (typically 292 mA over the full range of output current, 0 mA to 500 mA). These

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

TPS71025 also features a sleep mode; applying a TTL high signal to EN (enable) shuts down the regulator,

reducing the quiescent current to 0.5 mA maximum at TJ = 25°C.