TPS78825, TPS78833

SLVS382A – JUNE 2001 – REVISED JULY 2001

150-mA LOW-NOISE LDO WITH IN-RUSH

CURRENT CONTROL FOR USB APPLICATION

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FEATURES

(TPS78833)

Temperature Range

DESCRIPTION

The TPS78825 and TPS78833 are very small (SOT-23)

package, low-noise LDOs that regulate the output

voltage to 2.5 V and 3.3 V with input voltage ranging

from 2.7 V to an absolute maximum of 13.5 V. These

devices output 150 mA with a peak current of 350 mA

(typ). The TPS788xx family uses the SR pin to program

the output voltage slew rate to control the in-rush

current. This is specifically used in the USB application

where large load capacitance is present at start-up. The

TPS788xx devices use only 17

µA of quiescent current

and exhibit only 56

a 10

µF output capacitor.

The usual PNP pass transistor has been replaced by a

PMOS pass element. Because the PMOS pass element

behaves as a low-value resistor, the dropout voltage is

very low, typically 150 mV at 150 mA of load current, and

is directly proportional to the load current.

The TPS788xx also features a logic-enabled sleep

mode to shut down the regulator, reducing quiescent

current to 1

0

5

10

15

20

25

–40 –25 –10 5

20 35 50 65 80 95 110 125

IO = 1 mA

VCC = 4.3 V

TA – Free-Air Temperature – °C

QUIESCENT CURRENT

vs

FREE-AIR TEMPERATURE

IO = 150 mA

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OUTPUT VOLTAGE, ENABLE VOLTAGE

vs

TIME (START-UP)

t – Time – ms

030

20

10

40 50

70

60

80

90 100

VI = 4.3 V

VO = 3.3 V

IO = 150 mA

Co = 10 µF

TJ = 25°C

1

5

0

0

2

C(SR) = 0.01 µF

C(SR) = 0.1 µF

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of Texas Instruments

standard warranty. Production processing does not necessarily include

testing of all parameters.

Copyright

 2001, Texas Instruments Incorporated

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2

4

5

DBV PACKAGE

(TOP VIEW)

1

IN

GND

EN

OUT

SR