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

4

POST OFFICE BOX 655303

to –3.3V (unless otherwise noted)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

UCC384–12 Fixed –12 V-0.5-A Power Supply Section (continued)

Shutdown threshold

At shutdown pin (SD/CT)

–1.0

–0.7

–0.4

V

Shutdown input current

SD/CT = 0 V

5

10

25

µA

Output leakage in shutdown

VIN = –15 V,

VOUT = 0 V,

See Note 3

1

50

µA

Overtemperature shutdown

140

°C

Overtemperature hysteresis

20

°C

UCC384–12 Fixed –12-V 0.5-A Current Limit Section

Peak current limit

VOUT = 0 V

0.7

1.1

1.5

A

Overcurrent threshold

0.55

0.7

0.9

A

Current limit duty cycle

VOUT = 0 V

2.5

4

%

Overcurrent time out, tON

VOUT = 0 V

300

500

700

µs

UCC384–ADJ Adjustable 0.5-A Regulation Section

Reference voltage

TA = 25°C

–1.27

–1.25

–1.23

V

Reference voltage

Over temperature

–1.275

–1.215

V

Line regulation

VIN = –3.5 V to –15 V,

VOUT = VOUTS

0.5

3

mV

Load regulation

IOUT = 0 mA to 0.5 A

0.1

0.18

%

Output noise voltage

BW = 10 Hz to 10 kHz,

TA = 25°C

200

µVRMS

Dropout voltage VOUT

VIN

IOUT 0.5 A,

VOUT = –3.15 V

0.25

0.5

V

Dropout voltage, VOUT – VIN

IOUT 50 mA,

VOUT = –3.15 V

25

50

mV

Sense pin input current

100

250

nA

UCC384–ADJ Adjustable 0.5-A Power Supply Section

Input voltage range

–15

–3.5

V

Undervoltage lockout

–3.2

–2.95

–2.7

V

Quiescent current charge pump on

VIN = –3.15 V,

See Note 1

200

350

µA

Quiescent current

VIN = –15 V

200

250

µA

Quiescent current in shutdown

VIN = –13 V,

SD/CT = 0 V

TA = 0°C to 85°C, See Note 2

15

45

µA

Quiescent current in shutdown

VIN = –13 V,

SD/CT = 0 V

TA = –40°C to 0°C, See Note 2

100

µA

Shutdown threshold

At shutdown pin (SD/CT)

–1.0

–0.7

–0.4

V

Shutdown input current

SD/CT = 0V

5

10

25

µA

Output leakage in shutdown

VIN = –15V,

VOUT = 0 V,

See Note 3

1

50

µA

Overtemperature shutdown

140

°C

Overtemperature hysteresis

20

°C

UCC384–ADJ Adjustable 0.5-A Current Limit Section

Peak current limit

VOUT = 0 V

0.7

1.1

1.5

A

Overcurrent threshold

0.55

0.7

0.9

A

Current limit duty cycle

VOUT = 0 V

2.5

4

%

Overcurrent time out, tON

VOUT = 0 V

300

500

700

µs

NOTES:

1. The internal charge pump is enabled only for dropout condition with low VIN. Only in this condition is the charge pump required to

provide additional output FET fate drive to maintain dropout specifications. For conditions where the charge pump is not required,

it is disabled, which lowers overall device power consumption.

2. Ensured by design. Not production tested.

3. In the application during shutdown mode, output leakage current adds to quiescent current.