TPS71H01Q, TPS71H33Q, TPS71H48Q, TPS71H50Q LOW-DROPOUT VOLTAGE REGULATORS

SLVS152A - NOVEMBER 1996 - REVISED JANUARY 1997

features

Available in 5-V, 4.85-V, and 3.3-V Fixed-Output and Adjustable Versions
Very Low-Dropout Voltage . . . Maximum of 32 mV at I_O = 100 mA (TPS71H50)
Very Low Quiescent Current - Independent of Load . . . 285 uA Typ
Extremely Low Sleep-State Current . . . 0.5 uA Max
2% Tolerance Over Specified Conditions For Fixed-Output Versions
Output Current Range of 0 mA to 500 mA
TSSOP Package Option Offers Reduced Component Height for Space-Critical Applications
Thermally Enhanced Surface-Mount Package
Power-Good (PG) Status Output

description

The TPS71Hxx integrated circuits are a family of micropower low-dropout (LDO) voltage regulators. An order of magnitude reduction in dropout voltage and quiescent current over conventional LDO performance is achieved by 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 32 mV at an output current of 100 mA for the TPS71H50) 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 285 uA 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 LDO family also features a sleep mode; applying a TTL high signal to EN\ (enable\) shuts down the regulator, reducing the quiescent current to 0.5 uA maximum at T_J = 25°C.

Power good (PG) reports low output voltage and can be used to implement a power-on reset or a low-battery indicator.

The TPS71Hxx is offered in 3.3-V, 4.85-V, and 5-V fixed-voltage versions and in an adjustable version (programmable over the range of 1.2 V to 9.75 V). Output voltage tolerance is specified as a maximum of 2% over line, load, and temperature ranges (3% for adjustable version). The TPS71Hxx family is available in a TSSOP (20-pin) thermally enhanced surface-mount power package. The package has an innovative thermal pad that, when soldered to the printed-wiring board (PWB), enables the device to dissipate several watts of power (see Thermal Information section). Maximum height of the package is 1.2 mm.

Title: LOW-DROPOUT VOLTAGE REGULATORS
Product Family: VOLTAGE REGULATORS
Device Functionality: VOLTAGE REGULATOR
Orderable Devices: TPS71H01QPWPLE, TPS71H33QPWPLE, TPS71H48QPWPLE, TPS71H50QPWPLE

View the complete PDF datasheet: slvs152a.pdf (599 K Bytes) (Requires Acrobat Reader 3.x)

View more information about generic part numbers:TPS71H01, TPS71H33, TPS71H48, TPS71H50

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