UCC284–5, UCC284–12, UCC284–ADJ, UCC384–5, UCC384–12, UCC384–ADJ

LOW-DROPOUT 0.5-A NEGATIVE LINEAR REGULATOR

SLUS234D – JANUARY 2000 – REVISED FEBRUARY 2002

1

POST OFFICE BOX 655303

Regulation

description

The UCC384-x family of negative linear-series pass regulators is tailored for low-dropout applications where

low-quiescent power is important. Fabricated with a BCDMOS technology ideally suited for low input-to-output

differential applications, the UCC384-x passes 0.5 A while requiring only 0.2 V of input-voltage headroom.

Dropout voltage decreases linearly with output current, so that dropout at 50 mA is less than 20 mV.

Quiescent current consumption for the device under normal (non-dropout) conditions is typically 200

µA. An

integrated charge pump is internally enabled only when the device is operating near dropout with low VIN. This

ensured that the device meets the dropout specifications even for maximum load current and a VIN of –3.2 V

with only a modest increase in quiescent current. Quiescent current is always less than 350

µA, with the charge

pump enabled. The quiescent current of the UCC384 does not increase with load current.

Short-circuit current is internally limited. The device responds to a sustained overcurrent condition by turning

short circuit such that heat sinking, if at all required, must only accommodate normal operation. An external

The UCCx84-x can be shutdown to 45

µA (maximum) by pulling the SD/CT pin more positive than –0.7 V. To

allow for simpler interfacing, the SD/CT pin may be pulled up to 6 V above the ground pin without turning on

clamping diodes.

Internal power dissipation is further controlled with thermal-overload protection circuitry. Thermal shutdown

occurs if the junction temperature exceeds 140

°C. The chip remains off until the temperature has dropped 20°C

AVAILABLE OPTIONS

TA

OUTPUT VOLTAGE (V)

PACKAGE DEVICES

TA

TYP

(SOIC) DP

–5

UCC284DP–5

–40

°C to 85°C

–12

UCC284DP–12

40 C to 85 C

ADJ

UCC284DP–ADJ

–5

UCC384DP–5

0

°C to 70°C

–12

UCC384DP–12

ADJ

UCC384DP–ADJ

† All package types are available taped and reeled. Add TR suffix to device type

(e.g. UCC284DP–5TR) to order quantities of 3000 devices per reel.

Copyright

 2000, Texas Instruments Incorporated

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.

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.

DP PACKAGE

(FRONT VIEW)

VIN

VIN

SD/CT

VOUT

VIN

VOUTS

VIN

GND

1

2

3

4

8

7

6

5