TEXAS INSTRUMENTS UC282-1, UC282-2, UC282-3, UC282-ADJ, UC382-1 Technical data

UC282-1 UC282 1, UC282 2, UC282 3, UC282 ADJ, UC382 1, UC382 2, UC382 3, UC382 ADJ FAST LDO LINEAR REGULATOR

SLUS317B − JANUARY 2000 − REVISED FEBRUARY 2004

DFast Transient Response

D10-mA to 3-A Load Current

DShort Circuit Protection

DMaximum Dropout of 450-mV at 3-A Load Current

DSeparate Bias and VIN Pins

DAvailable in Adjustable or Fixed-Output Voltages

D5-Pin Package Allows Kelvin Sensing of Load Voltage

DReverse Current Protection

description

5-PIN TO-220

T PACKAGE (TOP VIEW)

5-PIN TO-263

TD PACKAGE (TOP VIEW)

Note: Tab = Ground

The UC382 is a low-dropout-linear regulator providing a quick response to fast load changes. Combined with its precision onboard reference, the UC382 excels at driving GTL and BTL buses. Due to its fast response to load transients, the total capacitance required to decouple the regulator’s output can be significantly decreased when compared to standard LDO linear regulators.

Dropout voltage (VIN to VOUT) is only 450 mV maximum at 100°C and 350 mV typical at 3-A load.

The onboard bandgap reference is stable with temperature and scaled for a 1.2-V input to the internal-power amplifier. The UC382 is available in fixed-output voltages of 1.5 V, 2.1 V, or 2.5 V. The output voltage of the adjustable version can be set with two external resistors. If the external resistors are omitted, the output voltage defaults to 1.2 V.

block diagram

	VB
	1
				R1	R2
			UC382−ADJ	OPEN	0
			UC382−1 (1.5 V)	2 k	500 Ω
			UC382−2 (2.1 V)	2 k	1.5 k Ω
			UC382−3 (2.5 V)	2 k	2.16 k Ω
	THERMAL
	SHUTDOWN
					2	VIN
1.2 V
BANDGAP			+
REFERENCE
			SHORT
	R1	R2	CIRCUIT
			SENSE
3	5			4
GND	ADJ			VOUT		UDG-00080

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.

All trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.	Copyright 2000−2004, T exas Instruments Incorporated
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265	1

UC282 1, UC282 2, UC282 3, UC282 ADJ, UC382 1, UC382 2, UC382 3, UC382 ADJ
FAST LDO LINEAR REGULATOR
SLUS317B − JANUARY 2000 − REVISED FEBRUARY 2004
absolute maximum ratings over operating free-air temperature (unless otherwise noted)† }
VB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	. . . . . . . .	. 13 V
VIN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	. . . . . . . .	7.5 V
Output voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	. 1.2 V to 6.0 V
Storage temperature, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	−65 °C to 150°C
Junction temperature, TJ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	−55 °C to 150°C
Lead temperature (soldering, 10 seconds) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	. . . . . . .	300°C

†Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

} Currents are positive into, negative out of the specified terminal. Consult Packaging Section of Databook for thermal limitations and considerations of packages.

AVAILABLE OPTIONS(1)

				PACKAGED DEVICES
TJ		TO-220 (T)				TO−263 (TD) (2)
		OUTPUT VOLTAGE				OUTPUT VOLTAGE
	1.5 V	2.1 V	2.5 V	1.2 V or ADJ	1.5 V	2.1 V	2.5 V	1.2 V or ADJ
–40°C to 100°C	282T-1	282T-2	282T-3	282T-ADJ	282TD-1	282TD-2	282TD-3	282TD-ADJ
0°C to 100°C	382T-1	382T-2	382T-3	382T-ADJ	382TD-1	382TD-2	382TD-3	382TD-ADJ

1.For more package and ordering information, see the Package Option Addendum located at the end of this data sheet.

2.For 50 piece reel, add KTTT (e.g., UC282TDKTTT−1); for 500 piece reel, add TR (e.g., UC282TDTR−1).

electrical characteristics, TA = −40 °C to 100°C for the UC282-X series and 0°C to 100°C for the

UC382-X, VB = 5 V, VIN = 3.3 V, VOUT = 2.5 V for the UC382-ADJ, TA = TJ, (unless otherwise stated)

UC382-3 fixed 2.5 V, 3-A family

PARAMETERS		TEST CONDITIONS	MIN	TYP	MAX	UNITS
Output voltage (IVOUT = 100 mA)	UC382-3		2.475	2.500	2.525	V
	UC282-3		2.450	2.500	2.525	V
Load regulation	IVOUT = 10 mA to 3 A			0.5	4	mV
VIN PSSR			80	100		dB
VB PSSR			50	60		dB
	IVOUT = 3 A,	TJ = 25°C		350	425	mV
VIN dropout voltage = VIN−VOUT	IVOUT = 3 A,	UC382-3		350	450	mV
	IVOUT = 3 A,	UC282-3		350	500	mV
VB dropout = VB−VOUT	IVOUT = 3 A,	UC382-3		1.8	2.10	V
	IVOUT = 3 A,	UC282-3		1.8	2.20	V
Short circuit current limit			3.3		4.5	A
VB current	IVOUT = 10 mA			6	11	mA
	IVOUT = 3 A			18	60	mA
VIN current	IVOUT = 3 A		2.94	2.97		A

2	POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

UC282 1, UC282 2, UC282 3, UC282 ADJ, UC382 1, UC382 2, UC382 3, UC382 ADJ

FAST LDO LINEAR REGULATOR

SLUS317B − JANUARY 2000 − REVISED FEBRUARY 2004

electrical characteristics, TA = −40 °C to 100°C for the UC282-X series and 0°C to 100°C for the

UC382-X, VB = 5 V, VIN = 3.3 V, VOUT = 2.5 V for the UC382-ADJ, TA = TJ, (unless otherwise stated)

UC382-2 fixed 2.1 V, 3-A family

PARAMETERS		TEST CONDITIONS	MIN	TYP	MAX	UNITS
Output voltage (IVOUT = 100 mA)	UC382-2		2.079	2.100	2.121	V
	UC282-2		2.058	2.100	2.121	V
Load regulation	IVOUT = 10 mA to 3 A			0.5	4	mV
VIN PSSR			80	100		dB
VB PSSR			52	62		dB
	IVOUT = 3 A,	TJ = 25°C		350	425	mV
VIN dropout voltage = VIN−VOUT	IVOUT = 3 A,	UC382-2		350	450	mV
	IVOUT = 3 A,	UC282-2		350	500	mV
VB dropout = VB−VOUT	IVOUT = 3 A,	UC382-2		1.8	2.10	V
	IVOUT = 3 A,	UC282-2		1.8	2.20	V
Short circuit current limit			3.3		4.5	A
VB current	IVOUT = 10 mA			6	11	mA
	IVOUT = 3 A			18	60	mA
VIN current	IVOUT = 3 A		2.94	2.97		A

UC382-1 fixed 1.5 V, 3-A family

PARAMETERS		TEST CONDITIONS	MIN	TYP	MAX	UNITS
Output voltage (IVOUT = 100 mA)	UC382-1		1.485	1.500	1.515	V
	UC282-1		1.470	1.500	1.515	V
Load regulation	IVOUT = 10 mA to 3 A			0.5	4	mV
VIN PSSR			80	100		dB
VB PSSR			55	65		dB
	IVOUT = 3 A,	TJ = 25°C		350	425	mV
VIN dropout voltage = VIN−VOUT	IVOUT = 3 A,	UC382-1		350	450	mV
	IVOUT = 3 A,	UC282-1		350	500	mV
VB dropout = VB−VOUT	IVOUT = 3 A,	UC382-1		1.8	2.10	V
	IVOUT = 3 A,	UC282-1		1.8	2.20	V
Short circuit current limit			3.3		4.5	A
VB current	IVOUT = 10 mA			6	11	mA
	IVOUT = 3 A			18	60	mA
VIN current	IVOUT = 3 A		2.94	2.97		A

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

3

UC282 1, UC282 2, UC282 3, UC282 ADJ, UC382 1, UC382 2, UC382 3, UC382 ADJ
FAST LDO LINEAR REGULATOR

SLUS317B − JANUARY 2000 − REVISED FEBRUARY 2004

electrical characteristics, TA = −40 °C to 100°C for the UC282-X series and 0°C to 100°C for the

UC382-X, VB = 5 V, VIN = 3.3 V, VOUT = 2.5 V for the UC382-ADJ, TA = TJ, (unless otherwise stated)

UC382-ADJ adjustable, 3-A family

PARAMETERS	TEST CONDITIONS		MIN	TYP	MAX	UNITS
ADJ voltage (IVOUT = 100 mA)	UC382-ADJ		1.188	1.200	1.212	V
	UC282-ADJ		1.176	1.200	1.212	V
Load regulation	IVOUT = 10 mA to 3 A			0.5	4	mV
VIN PSSR	VOUT programmed for 2.5 V		80	100		dB
VB PSSR	VOUT programmed for 2.5 V		50	60		dB
	IVOUT = 3 A,	TJ = 25°C		350	425	mV
VIN dropout voltage = VIN−VOUT	IVOUT = 3 A,	UC382-ADJ		350	450	mV
	IVOUT = 3 A,	UC282-ADJ		350	500	mV
VB dropout = VB−VOUT	IVOUT = 3 A,	UC382-ADJ		1.8	2.10	V
	IVOUT = 3 A,	UC282-ADJ		1.8	2.20	V
Short circuit current limit			3.3		4.5	A
VB current	IVOUT = 10 mA			6	11	mA
	IVOUT = 3 A			18	60	mA
VIN current	IVOUT = 3 A		2.94	2.97		A

pin descriptions

ADJ: In the adjustable version, the user programs the output voltage with two external resistors. The resistors should be 0.1% for high accuracy. The output amplifier is configured as a non-inverting-operational amplifier. The resistors should meet the criteria of R3 || R4 < 100 Ω. Connect ADJ to VOUT for an output voltage of 1.2 V. Note that the point at which the feedback network is connected to the output is the Kelvin sense point. For -1, -2, and -3 versions, ADJ pin is tied to VOUT to obtain specified output voltage.

GND: For accurate results, the GND pin should be referenced to the load ground.

VB: Supplies power to all circuits of the regulator except the collector of the output-power transistor. The 2-V headroom from VB to VOUT allows the use of a Darlington output stage for inherently-low-output impedance and fast response. (Dropout is derated for junction temperatures below 0°C.)

VIN: Supplies the current to the collector of the output-power transistor only. The dropout (VIN−VOUT) is under 100 mV for light loads; maximum dropout is 450 mV at 3 A for TJ = 0°C to 100°C. (Dropout is derated for junction temperatures over 100°C.) At full load, the majority of the VB current is going to the load.

VOUT: This pin should be connected to the load via a low impedance path. Avoid connectors which add significant inductance and resistance. Note that even though a Kelvin sense is available through a 5-pin package, care must be taken since voltage drops along wire traces add to the dropout voltage.

4	POST OFFICE BOX 655303 • DALLAS, TEXAS 75265