Texas Instruments UC385TD-ADJ, UC385TD-3, UC385TD-2, UC385TD-1, UC385T-ADJ Datasheet

/C 0 C 0 C 0 C 0A C 0 C 0 C 0 C 0A

FA A 0A

0 A

SLUS212B ± NOVEMBER 1999 ± REVISED APRIL 2000

Fast Transient Response

10 mA to 5 A Load Current

Short Circuit Protection

Maximum Dropout of 500 mV at 5-A Load Current

Separate Bias (VB) and VIN Pins

Available in Adjustable or Fixed Output Voltages

5-Pin Package Allows Kelvin Sensing of Load Voltage

Reverse Current Protection

5-PIN TO-220

T PACKAGE (TOP VIEW)

5-PIN TO-263

TD PACKAGE (TOP VIEW)

description

Note: Tab = Ground

The UC385 is a low dropout linear regulator providing a quick response to fast load changes. Combined with its precision on-board reference, the UC385 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 490 mV maximum and 350 mV typical at 5-A load (0°C to 100°C).

The on-board bandgap reference is stable with temperature and scaled for a 1.2 V input to the internal power amplifier. The UC385 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

THERMAL
SHUTDOWN
1.2 V			2
BANDGAP	+		VIN
REFERENCE	_
	SHORT
	CIRCUIT
R1	SENSE
	R2
		R1	R2
	UC385±ADJ	OPEN	0
	UC385±1 (1.5 V)	2 kΩ	500 Ω
	UC385±2 (2.1 V)	2 kΩ	1.5 kΩ
	UC385±3 (2.5 V)	2 kΩ	2187 kΩ
3	5		4
GND	ADJ		VOUT

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.

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Copyright 2000, Texas Instruments Incorporated

1

HEADER	LINE	1	FAMILY
HEADER	LINE	2
HEADER	LINE	3
DATE AND TRACKING INFORMATION
absolute maximum ratings over operating free-air temperature (unless otherwise noted)²
Input voltage, VI (VIN) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .			. . . . . . . . 7.5 V
Output Voltage, VI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .			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

²Stresses beyond those listed under ªabsolute maximum ratingsº may cause permanent damage to the device. These are stress ratings only, nda functional operation of the device at these or any other conditions beyond those indicated under ªrecommended operating conditionsº is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

		ORDERING INFORMATION
Temperature Range	Package	Output Voltage
		1: 1.5 V
2: ±40°C to 100°C	TD: TO±263	2: 2.1 V
3: 0°C to 100°C	T: TO-220	3: 2.5 V
		ADJ: 1.2 V or Adjustable

electrical characteristics TA = ±40°C to 100°C for the UC285-x series and 0°C to 100°C for the

UC385-x, VB = 5 V, VIN = 3.3 V, VOUT = 2.5 V, TA = TJ (unless otherwise noted)

PARAMETER		TEST CONDITION		MI0N	TYP	MAX	UNIT
UC385-3 Fixed 2.5 V, 5-A Family
Output voltage	UC385-3	IVOUT = 100 mA		2.475	2.5	2.525	V
	UC285-3	IVOUT = 100 mA		2.45	2.5	2.525	V
Load regulation		IVOUT = 10 mA to 5 A			0.5	4	mV
VIN PSRR				80	110		dB
VB PSRR				50	65		dB
VIN dropout voltage (VIN - VOUT)		IVOUT = 5 A,	TJ = 25°C		350	425	mV
	UC385-3	IVOUT = 5 A			350	490	mV
	UC285-3	IVOUT = 5 A			350	500	mV
VB dropout (VB - VOUT)	UC385-3	IVOUT = 5 A			1.8	2.1	V
	UC285-3	IVOUT = 5 A			1.8	2.2	V
Short circuit current limit				5.1		7.5	A
VB current		IVOUT = 10 mA			8	15	mA
		IVOUT = 5 A			40	100	mA
VIN current		IVOUT = 5 A		4.9	4.96		A
UC385-2 Fixed 2.1 V, 5-A Family
Output voltage	UC385-2	IVOUT = 100 mA		2.079	2.1	2.121	V
	UC285-2	IVOUT = 100 mA		2.058	2.1	2.121	V
Load regulation		IVOUT = 10 mA to 5 A			0.5	4	mV
VIN PSRR				80	110		dB
VB PSRR				50	67		dB

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UC285 1 UC285 2 UC285 3 UC285 ADJ UC385 1 UC385 2 UC385 3 UC385 AD

FAST TRANSIENT RESPONSE 5 A

LOW DROPOUT REGULATOR

SLUS212B ± NOVEMBER 1999 ± REVISED APRIL 2000

electrical characteristics TA = ±40°C to 100°C for the UC285-x series and 0°C to 100°C for the

UC385-x, VB = 5 V, VIN = 3.3 V, VOUT = 2.5 V, TA = TJ (unless otherwise noted) (continued)

PARAMETER		TEST CONDITION	MIN	TYP	MAX	UNIT
UC385±2 Fixed 2.1 V, 5-A Family (continued)
VIN dropout voltage (VIN - VOUT)		IVOUT = 5 A, TJ = 25°C		350	425	mV
	UC385-2	IVOUT = 5 A		350	490	mV
	UC285-2	IVOUT = 5 A		350	500	mV
VB dropout (VB - VOUT)	UC385-2	IVOUT = 5 A		1.8	2.1	V
	UC285-2	IVOUT = 5 A		1.8	2.2	V
Short circuit current limit			5.1		7.5	A
VB current		IVOUT = 10 mA		8	15	mA
		IVOUT = 5 A		40	100	mA
VIN current		IVOUT = 5 A	4.9	4.96		A
UC385±1 Fixed 1.5 V, 5-A Family
Output voltage	UC385-1	IVOUT = 100 mA	1.485	1.5	1.515	V
	UC285-1	IVOUT = 100 mA	1.470	1.5	1.515	V
Load regulation		IVOUT = 10 mA to 5 A		0.5	4	mV
VIN PSRR			80	110		dB
VB PSRR			50	65		dB
VIN dropout voltage (VIN - VOUT)		IVOUT = 5 A, TJ = 25°C		350	425	mV
	UC285-1	IVOUT 5 A		350	490	mV
	UC285-2	IVOUT = 5 A		350	500	mV
VB dropout (VB - VOUT)	UC385-1	IVOUT = 5 A		1.8	2.1	V
	UC285-1	IVOUT = 5 A		1.8	2.2	V
Short circuit current limit			5.1		7.5	A
VB current		IVOUT = 10 mA		8	15	mA
		IVOUT = 5 A		40	100	mA
VIN = current		IVOUT = 5 A	4.9	4.96		A
UC385-ADJ Adjustable, 5-A Family
ADJ voltage	UC385-ADJ	IVOUT - 100 mA	1.188	1.2	1.212	V
	UC285-ADJ	IVOUT - 100 mA	1.176	1.2	1.212	V
Load regulation		IVOUT = 10 mA to 5 A		0.5	4	mV
VIN PSRR		VOUT programmed for 2.5 V	80	110		dB
VB PSRR VOUT		Programmed for 2.5 V	50	65		dB
VIN dropout voltage (VIN - VOUT)		IVOUT = 5 A, TJ = 25°C		350	425	mV
	UC385-ADJ	IVOUT = 5 A		350	490	mV
	UC285-ADJ	IVOUT = 5 A		350	500	mV
VB dropout (VB - VOUT)	UC385-ADJ	IVOUT = 5 A		1.8	2.1	V
	UC285-ADJ	IVOUT = 5 A		1.8	2.2	V
Short circuit current limit			5.1		7.5	A
VB current		IVOUT = 10 mA		8	15	mA
		IVOUT = 5 A		40	100	mA
VIN current		IVOUT = 5 A	4.9	4.96		A

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