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

UCC284-5/-12/-ADJ

UCC384-5/-12/-ADJ

Low Dropout 0.5A Negative Linear Regulator

FEATURES

BLOCK DIAGRAM

•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

											(+)
	1 A									4	GND
								R1	R2
	DISCHARGE
		+					UCC384-ADJ	0	OPEN
			SHUTDOWN			–2.2V	UCC384-5	375K	125K
	–0.6V	–					1.25V			R2
		50k					UCC384-12	375K	43.6K
		+
	–1.6V	–	S	Q	TON
SD/CT	8
			R	Q	TOFF			VPUMP
	–2.6V	+
		–					+			R1
							GM
	40 A						–
	CHARGE									1	VOUTS
	OVERCURRENT
		700mA	–
			+
VIN	2	THERMAL
VIN	3	SHUTDOWN
VIN	6		UVLO
VIN	7									5	VOUT
(–)											(–)
										UDG-99030

DESCRIPTION

The UCC384 family of negative linear series pass regulators is tailored for low drop out applications where low quiescent power is important. Fabricated with a BCDMOS technology ideally suited for low input to output 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 normal (non-drop out) conditions is typically 200 A. An integrated 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 specifications 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 350 A, 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 responds to a sustained over current condition by turning off after a TON delay. The device then stays off for a pe-

riod, TOFF, that is 40 times the TON delay. The device then begins pulsing on and off at the TON/TOFF duty cycle of 2.5%. This drastically reduces the power dissipation

during short circuit such that heat sinking, if at all required, must only accommodate normal operation. An external capacitor sets the on time. The off time is always 40 times TON.

The UCC384 can be shutdown to 45 A (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 thermal overload protection circuitry. Thermal shutdown occurs if the junction temperature exceeds 140°C. The chip will remain off until the temperature has dropped 20°C.

ABSOLUTE MAXIMUM RATINGS

Supply Voltage, VIN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –16V Shutdown Voltage, SD/CT . . . . . . . . . . . . . . . . . . . . +6V to –5V Storage Temperature . . . . . . . . . . . . . . . . . . . −65°C to +150°C 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.

UCC284-5/-12/-ADJ

UCC384-5/-12/-ADJ

CONNECTION DIAGRAM

SOIC-8 (Top View)

DP Package

ELECTRICAL CHARACTERISTICS: Unless otherwise specified, TA = 0°C to 70°C for the UCC384 and –40°C to 85°C for the UCC284, VIN = VOUT – 1.5V, IOUT = 0mA, COUT = 4.7µF, and CT = 0.015µF. For UCC384-ADJ, VOUT is set to –3.3V. TJ = TA.

PARAMETER		TEST CONDITIONS	MIN	TYP	MAX	UNITS
UCC384-5 Fixed –5V 0.5A Regulation Section
Output Voltage		TA = 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		IOUT = 0mA to 0.5A		0.1	0.25	%
Output Noise Voltage		TA = 25°C, BW = 10Hz to 10kHz		200		µVRMS
Drop Out Voltage, VOUT – VIN		IOUT 0.5A, VOUT = –4.8V		0.20	0.50	V
		IOUT 50mA, VOUT = –4.8V		20	50	mV
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°C		1	10	A
		Over Temperature			50	A
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, TON		VOUT = 0V	300	450	650	µs
UCC384-12 Fixed 12V 0.5A Regulation Section
Output Voltage		TA = 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		IOUT = 0mA to 0.5A		0.1	0.3	%
Output Noise Voltage		TA = 25°C, BW = 10Hz to 10kHz		200		µVRMS
Drop Out Voltage, VOUT - VIN		IOUT 0.5A, VOUT = –11.6V		0.15	0.5	V
		IOUT 50mA, VOUT = –11.6V		15	50	mV

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UCC284-5/-12/-ADJ

UCC384-5/-12/-ADJ

ELECTRICAL CHARACTERISTICS: Unless otherwise specified, TA = 0°C to 70°C for the UCC384 and –40°C to 85°C for the UCC284, VIN = VOUT – 1.5V, IOUT = 0mA, COUT = 4.7 F, and CT = 0.015 F. For UCC384-ADJ, VOUT is set to –3.3V. TJ = TA.

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	A
Quiescent Current in Shutdown	VIN = –15V, SD/CT = 0V, No Load		24	45	A
Shutdown Threshold	At Shutdown Pin	–1.0	–0.6	–0.4	V
Shutdown Input Current	SD/CT = 0V	5	17	25	A
Output Leakage in Shutdown	VIN = –15V, VOUT = 0, 25°C		1	10	A
	Over Temperature			50	A
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, TON	VOUT = 0V	300	450	650	s
UCC384-ADJ Adjustable 0.5A Regulation Section
Reference Voltage	TA = 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	IOUT = 0mA to 0.5A		0.1	0.18	%
Output Noise Voltage	TA = 25°C, BW = 10Hz to 10kHz		200		VRMS
Drop Out Voltage, VOUT - VIN	IOUT 0.5A, VOUT = –3.15V		0.25	0.5	V
	IOUT 50mA, VOUT = 3.15V		25	50	mV
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	A
Quiescent Current	VIN = –15V		200	250	A
Quiescent Current in Shutdown	VIN = –15V, SD/CT = 0V, No Load		24	45	A
Shutdown Threshold	At Shutdown Pin	–1.0	–0.6	–0.4	V
Shutdown Input Current	SD/CT = 0V	5	17	25	A
Output Leakage in Shutdown	VIN = –15V, VOUT = 0, 25°C		1	10	A
	Over Temperature			50	A
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, TON	VOUT = 0V	300	450	650	s

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