Texas Instruments UCC384DPTR-ADJ, UCC384DPTR-5, UCC384DP-ADJ, UCC384DP-5, UCC384DP-12 Datasheet

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Low Dropout 0.5A Negative Linear Regulator

UCC284-5/-12/-ADJ UCC384-5/-12/-ADJ

FEATURES

Precision Negative Series

•

Pass Voltage Regulation

0.2V Drop Out at 0.5A

•

Wide Input voltage Range

•

–3.2V to –15V

Low Quiescent Current

•

Irrespective of Load

Simple Logic Shutdown

•

Interfacing

–5V, –12V and Adjustable

•

Output

2.5% Duty Cycle Short Circuit

•

Protection

• Remote Load Sensing for

Accurate Load Regulation

• 8-Pin DP Package

BLOCK DIAGRAM

1µA DISCHARGE

–

–0.6V

–

–1.6V

SD/CT

–2.6V

–

40µA

CHARGE

OVERCURRENT

700mA

VIN

7 5

(–) (–)

50k

–

THERMAL

SHUTDOWN

UVLO

SHUTDOWN

TON

TOFF

–2.2V

1.25V

UCC384-5

UCC384-12

–

R1 R2

375K

VPUMP

0 OPENUCC384-ADJ

125K

43.6K

(+)

4 GND

VOUTS

VOUT

UDG-99030

DESCRIPTION

The UCC384 family of negative linear series pass regula tors is tailored for low drop out applications where low quiescent power is important. Fabricated with a BCDMOS technology ideally suited for low input to out put differential applications, the UCC384 will pass 0.5A while requiring only 0.2V of input voltage headroom. Drop out voltage decreases linearly with output current, so that drop out at 50mA is less than 20mV.

Quiescent current consumption for the device under nor mal (non-drop out) conditions is typically 200µA. An inte grated charge pump is internally enabled only when the device is operating near drop out with low VIN. This guarantees that the device will meet the drop out specifi cations even for maximum load current and a VIN of –3.2V with only a modest increase in quiescent current. Quiescent current is always less than 350µA, with the charge pump enabled. Quiescent current of the UCC384 does not increase with load current.

SLUS234A - JANUARY 2000

Short circuit current is internally limited. The device re sponds to a sustained over current condition by turning off after a T

riod, T

OFF

then begins pulsing on and off at the T

delay. The device then stays off for a pe

, that is 40 times the TONdelay. The device

ON/TOFF

duty cycle of 2.5%. This drastically reduces the power dissipation during short circuit such that heat sinking, if at all re quired, must only accommodate normal operation. An external capacitor sets the on time. The off time is al

ways 40 times T

The UCC384 can be shutdown to 45µA (maximum) by pulling the SD/CT pin more positive than –0.6V. To allow

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

Internal power dissipation is further controlled with ther mal overload protection circuitry. Thermal shutdown oc curs if the junction temperature exceeds 140°C. The chip will remain off until the temperature has dropped 20°C.

UCC284-5/-12/-ADJ UCC384-5/-12/-ADJ

ABSOLUTE MAXIMUM RATINGS

CONNECTION DIAGRAM

Supply Voltage, VIN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –16V

Shutdown Voltage, SD/CT . . . . . . . . . . . . . . . . . . . . +6V to –5V

Storage Temperature . . . . . . . . . . . . . . . . . . . −65°C to +150°C

SOIC-8 (Top View) DP Package

Junction Temperature. . . . . . . . . . . . . . . . . . . –55°C to +150°C

Lead Temperature (Soldering, 10 sec.) . . . . . . . . . . . . . +300°C

All voltages are with respect to ground. Currents are positive into, negative out of the specified terminal. All voltages are with respect to ground. Consult Packaging Section of Databook for thermal limitations and considerations of packages.

ELECTRICAL CHARACTERISTICS:

for the UCC284, VIN = VOUT – 1.5V, I T

= TA.

OUT

Unless otherwise specified, TA= 0°C to 70°C for the UCC384 and –40°C to 85°C

= 0mA, C

= 4.7µF, and CT = 0.015µF. For UCC384-ADJ, VOUT is set to –3.3V.

OUT

PARAMETER TEST CONDITIONS MIN TYP MAX UNITS

UCC384-5 Fixed –5V 0.5A Regulation Section

Output Voltage T

= 25°C –5.075 –5 –4.925 V

Over all conditions –5.100 –4.850 V

Line Regulation VIN = –5.3V to –15V 1.5 10 mV

Load Regulation I

Output Noise Voltage T

Drop Out Voltage, VOUT – VIN I

= 0mA to 0.5A 0.1 0.25 %

OUT

= 25°C, BW = 10Hz to 10kHz 200 µVRMS

0.5A, VOUT = –4.8V 0.20 0.50 V

OUT

50mA, VOUT = –4.8V 20 50 mV

OUT

UCC384-5 Fixed –5V 0.5A Power Supply Section

Input Voltage Range –15 –5.2 V Quiescent Current Charge Pump On VIN = –4.85V (Note 1) 280 350 µA Quiescent Current VIN = –15V 200 250 µA Quiescent Current in Shutdown VIN = –15V, SD/CT = 0V, No Load 24 45 µA

Shutdown Threshold At Shutdown Pin –1.0 –0.6 –0.4 V Shutdown Input Current SD/CT = 0V 5 17 25 µA Output Leakage in Shutdown VIN = –15V, VOUT = 0, 25°C110

Over Temperature 50

Over Temperature Shutdown 140 °C

Over Temperature Hysteresis 20 °C

UCC384-5 Fixed –5V 0.5A Current Limit Section

Peak Current Limit VOUT = 0V 0.7 1.1 1.5 A

Over Current Threshold 0.55 0.7 0.9 A

Current Limit Duty Cycle VOUT = 0V 2.5 4 %

Overcurrent Time Out, T

VOUT = 0V 300 450 650 µs

UCC384-12 Fixed 12V 0.5A Regulation Section

Output Voltage T

= 25°C –12.18 –12 –11.82 V

Over all conditions –12.24 –11.64 V

Line Regulation VIN = –12.5V to –15V 5 15 mV

Load Regulation I

Output Noise Voltage T

Drop Out Voltage, VOUT - VIN I

= 0mA to 0.5A 0.1 0.3 %

OUT

= 25°C, BW = 10Hz to 10kHz 200 µVRMS

0.5A, VOUT = –11.6V 0.15 0.5 V

OUT

50mA, VOUT = –11.6V 15 50 mV

OUT

UCC284-5/-12/-ADJ UCC384-5/-12/-ADJ

ELECTRICAL CHARACTERISTICS:

for the UCC284, VIN = VOUT – 1.5V, I T

= TA.

OUT

Unless otherwise specified, TA= 0°C to 70°C for the UCC384 and –40°C to 85°C

= 0mA, C

= 4.7µF, and CT = 0.015µF. For UCC384-ADJ, VOUT is set to –3.3V.

OUT

PARAMETER TEST CONDITIONS MIN TYP MAX UNITS

UCC384-12 Fixed –12V 0.5A Power Supply Section

Input Voltage Range –15 –12.2 V Quiescent Current VIN = –15V 220 350 µA Quiescent Current in Shutdown VIN = –15V, SD/CT = 0V, No Load 24 45 µA

Shutdown Threshold At Shutdown Pin –1.0 –0.6 –0.4 V Shutdown Input Current SD/CT = 0V 5 17 25 µA Output Leakage in Shutdown VIN = –15V, VOUT = 0, 25°C110µA

Over Temperature 50 µA

Over Temperature Shutdown 140 °C

Over Temperature Hysteresis 20 °C

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

Peak Current Limit VOUT = 0V 0.7 1.2 1.5 A

Over Current Threshold 0.55 0.7 0.9 A

Current Limit Duty Cycle VOUT = 0V 2.5 4 %

Over Current Time Out, T

VOUT = 0V 300 450 650 µs

UCC384-ADJ Adjustable 0.5A Regulation Section

Reference Voltage T

= 25°C –1.27 –1.25 –1.23 V

Over Temperature –1.275 –1.215 V

Line Regulation VIN = –3.5V to –15V, VOUT = VOUTS 0.5 3 mV

Load Regulation I

Output Noise Voltage T

Drop Out Voltage, VOUT - VIN I

= 0mA to 0.5A 0.1 0.18 %

OUT

= 25°C, BW = 10Hz to 10kHz 200 µVRMS

0.5A, VOUT = –3.15V 0.25 0.5 V

OUT

50mA, VOUT = 3.15V 25 50 mV

OUT

Sense Pin Input Current 100 250 nA

UCC384-ADJ Adjustable 0.5A Power Supply Section

Input Voltage Range –15 –3.5 V

Undervoltage Lockout –3.2 –2.7 V Quiescent Current Charge Pump On VIN = –3.15V (Note 1) 200 350 µA Quiescent Current VIN = –15V 200 250 µA Quiescent Current in Shutdown VIN = –15V, SD/CT = 0V, No Load 24 45 µA

Shutdown Threshold At Shutdown Pin –1.0 –0.6 –0.4 V Shutdown Input Current SD/CT = 0V 5 17 25 µA Output Leakage in Shutdown VIN = –15V, VOUT = 0, 25°C110µA

Over Temperature 50 µA

Over Temperature Shutdown 140 °C

Over Temperature Hysteresis 20 °C

UCC384-ADJ Adjustable 0.5A Current Limit Section

Peak Current Limit VOUT = 0V 0.7 1.1 1.5 A

Over Current Threshold 0.55 0.7 0.9 A

Current Limit Duty Cycle VOUT = 0V 2.5 4 %

Over Current Time Out, T

Note 1: Internal Charge Pump is enabled only for drop-out condition with low VIN. Only in this condition is the Charge Pump re

VOUT = 0V 300 450 650 µs

quired to provide additional output FET gate drive to maintain drop-out specifications. For conditions where the Charge Pump is not required, it is disabled, which lowers overall device power consumption.

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