UCC386, UCC387, UCC388

LOW DROPOUT 200mA LINEAR REGULATOR

SLUS377B - JULY 1999 - REVISED MAY 2000

1

POST OFFICE BOX 655303

Isolation with Low Leakage

(10 A typical)

200 mA

Limiting

Load Regulation

description

The UCC386/7/8 positive linear pass regulator series is tailored for low-dropout applications where extremely

low quiescent power is required. Fabricated with BiCMOS technology ideally suited for low input to output

differential applications, the UCC386/7/8 will pass 200 mA while requiring only 200 mV of input voltage

headroom. Quiescent current is typically less than 10

µA. To prevent reverse current conduction, on-chip

circuitry limits the minimum forward voltage to 50 mV typical. Once the forward voltage limit is reached, the

input-output differential voltage is maintained as the input voltage drops until undervoltage lockout disables the

regulator.

block diagram and application circuit

UDG-98087

3

7

6

4

5

8

1

2

+

–

R1

R2

1.25 V

OVERCURRENT,

HICCUP CONTROL

& THERMAL

SHUTDOWN

SWITCH CONTROL

RS1

RS2

LOAD

UCC388 ONLY

FROM OPEN DRAIN

SHUTDOWN COMMAND

+

+

VOUT

GND

GND

VSENSE

VIN

GND

GND

OFFB

UCC386

UCC387

UCC388

R1

1.025 m

1.875 m

0

R2

625 k

625 k

OPEN

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.

1

2

3

4

8

7

6

5

VOUT

GND

GND

VSENSE

VIN

GND

GND

OFFB

SOIC

DP PACKAGES

(TOP VIEW)

1

2

3

4

8

7

6

5

VIN

N/C

N/C

VOUT

OFFB

N/C

VSENSE

GND

TSSOP

PW PACKAGES

(TOP VIEW)