MOTOROLA LT1585ACT, LT1585ACM-1.5, LT1585ACM, LT1585ACT-1.5 Datasheet

Order this document by LT1585A/D

	5A Low Dropout Fast Response LT1585A
	Positive	Adjustable and Fixed
	Voltage	Regulators
								5A LOW DROPOUT FAST
	The LT1585A is a low dropout 3±terminal voltage regulator with 5A output
								RESPONSE POSITIVE
	current capability.
								ADJUSTABLE AND FIXED
	Design has been optimized for low voltage applications where transient
	response and minimum input voltage are critical. This voltage regulator							VOLTAGE REGULATOR
	features a low dropout voltage and fast transient response. These
	improvements make them ideal for low voltage microprocessor applications							SILICON MONOLITHIC
	requiring a regulated 2.5V to 3.6V output with an input supply below 7V.
								INTEGRATED CIRCUIT
	Current limits is trimmed to ensure specified output current and controlled
	short±circuit current. On±chip thermal limiting provides protection against
	any combination of overload that would create excessive junction
	temperatures. The LT1585A is available in the industry standard 3±pin
	TO±220 and D2PAK power package.
	Features
	• Fast Transient Response
	• Guaranteed Dropout Voltage at Multiple Currents
	• Load Regulation: 0.05% Typ
	• Trimmed Current Limit
	• On±Chip Thermal Limiting							1
								2	3
	• Standard 3±Pin Power Package
	Applications							T SUFFIX
								PLASTIC PACKAGE
	• Pentium Processor Supplies
								CASE 221A
	• Power PC Supplies							Adjustable output:	Fixed 1.5V output:
	• Other 2.5V to 3.6V Microprocessor Supplies
								Pin 1. Adjust	Pin 1. Gnd
	• Low Voltage Logic Supplies							Pin 2. Vout	Pin 2. Vout
	• Battery±Powered Circuitry							Pin 3. Vin	Pin 3. Vin
	• Post Regulator for Switching Supply

Simplified Block Diagram			1	2
				3
Vin
				CM SUFFIX
+		PLASTIC PACKAGE
±				CASE 936
				(D2PAK)
		ORDERING INFORMATION
				Tested	Output
		Device	Operating		Voltage	Package
				Temp.	Type
				Range
Thermal		LT1585ACT	0 to 125°C		ADJ.	TO±220
Limit		LT1585ACM	0 to 125°C		ADJ.	D2PAK
	Vout	LT1585ACT±1.5	0 to 125°C		FIXED	TO±220
					1.5V
Adjust		LT1585ACM±1.5		°	FIXED	D2PAK
			0 to 125 C		1.5V

Motorola, Inc. 1999

Rev 0

LT1585A

ABSOLUTE MAXIMUM RATINGS (Absolute Maximum Ratings indicate limits beyond which damage to the device may occur)

		Rating	Symbol	Pin #	Value	Unit
Maximum Supply Voltage			Vin	3	12	V
Power Dissipation
Case 221A (TO±220) (TJ = +25°C)			PD		Internally Limited	W
Thermal Resistance, Junction±to±Ambient			RθJA		65	°C/W
Thermal Resistance, Junction±to±Case			RθJC		5.0	°C/W
Case 936 (D2PAK) (T	J	= +25°C)	P		Internally Limited	W
			D			°C/W
Thermal Resistance, Junction±to±Ambient			RθJA		70
Thermal Resistance, Junction±to±Case			RθJC		5.0	°C/W
Storage Temperature Range			Tstg		±65 to 150	°C
Minimum ESD Rating (Human Body Model: C = 100pF, R = 1.5 kW)					3.0	kV
Lead Temperature (Soldering, 10 sec.)					260	°C
Maximum Junction Temperature			TJ		150	°C

OPERATING RATINGS (Operating Ratings indicate conditions for which the device is intended to be functional, but do not guarantee specific performance limits. For guaranteed specifications and test conditions, see the Electrical Characteristics)

Rating		Symbol		Pin #			Value			Unit
Operating Junction Temperature Range		TJ					0 to +125			°C
Supply Voltage				3			7.0			V
ELECTRICAL CHARACTERISTICS (0 < TJ < +125°C, unless otherwise noted)
Characteristic		Symbol		Pin #		Min	Typ	Max		Unit
Reference Voltage (LT1585A)		Vref		1						V
(Vin±Vout) = 3V, Iout = 10mA, TJ = 25°C						1.238	1.250	1.262
1.5V ≤ (Vin±Vout) ≤ 5.75V, 10mA ≤ Iout ≤ 5A						1.225	1.250	1.275
Output Voltage (LT1585A±1.5)				2						V
Vin = 5V, TJ = 25°C, Iout = 0mA						1.485	1.5	1.515
3V ≤ Vin ≤ 7V, 0mA ≤ Iout ≤ 5A						1.470	1.5	1.530
Line Regulation [Notes 1, 2]		Regline		2						%
LT1585A: 2.75V ≤ Vin ≤ 7V, Iout = 10mA						±	0.005	0.2
LT1585A±1.5: 3V ≤ Vin ≤ 7V, Iout = 0mA						±	0.005	0.2
Load Regulation [Notes 1, 2]		Regload		2						%
LT1585A: (Vin±Vout) = 3V, TJ = 25°C, 10mA ≤ Iout ≤ 5A						±	0.05	0.3
LT1585A±1.5: Vin = 5V, TJ = 25°C, 0mA ≤ Iout ≤ 5A						±	0.05	0.3
LT1585A: (Vin±Vout) = 3V, 10mA ≤ Iout ≤ 5A						±	0.05	0.5
LT1585A±1.5: Vin = 5V, 0mA ≤ Iout ≤ 5A						±	0.05	0.5
Dropout Voltage		Vin±Vout								V
LT1585A: DVREF = 1%, IOUT = 3A						±	1.150	1.300
LT1585A±1.5: DVOUT = 1%, IOUT = 3A						±	1.150	1.300
LT1585A: DVREF = 1%, IOUT = 5A						±	1.200	1.400
LT1585A±1.5: DVOUT = 1%, IOUT = 5A						±	1.200	1.400
Current Limit [Note 3]		ILimit		2						A
(Vin±Vout) = 5.5V						5.0	6.0	±
Adjust Pin Current (LT1585A)		IAdj		1		±	55	120		μA
Adjust Pin Current Change (LT1585A) [Note 3]				1						μA
1.5V ≤ (Vin±Vout) ≤ 5.75V, 10mA ≤ Iout ≤ 5A						±	0.2	5.0
Minimum Load Current (LT1585A) 1.5V ≤ (Vin±Vout) ≤ 5.75V		ILoad min		2		±	2.0	10		mA
Quiescent Current (LT1585A±1.5) Vin = 5V				1		±	7.0	13		mA
Ripple Rejection		RR		2						dB
LT1585A: f = 120Hz, Cout = 25μF Tant., (Vin±Vout) = 3V, Iout = 5A						60	72	±
LT1585A±1.5: f = 120Hz, Cout = 25μF Tant., Vin = 4.5V, Iout = 5A						60	72	±
Thermal Regulation TJ = 25°C, 30ms Pulse		T°Reg				±	0.004	±		%/W
Temperature Stability		T°Stab				±	0.5	±		%
Long Term Stability TJ = 125°C, 1000 Hrs						±	0.03	1.0		%
RMS Output Noise (% of Vout) TJ = 25°C, 10Hz ≤ f ≤ 10kHz						±	0.003	±		%

NOTES 1. See thermal regulation specifications for changes in output voltage due to heating effects. Load and line regulation are measured at a constant junction temperature by low duty cycle pulse testing.

2.Line and load regulations are guaranteed up to the maximum power dissipation 28.8W for the LT1585A in T±package. Power dissipation is determined by input/output differential and the output current. Guaranteed maximum output power will not be available over the full input/output voltage range.

3.The LT1585A has constant current limit with changes in input±to±output voltage.

2	MOTOROLA ANALOG IC DEVICE DATA

LT1585A

Figure 1. Dropout Voltage vs Output Current

Figure 2. Short±Circuit Current vs Temperature

	1.4
	1.3
(V)	1.2					±5°C
VOLTAGE	1.1					25°C
	1.0					125°C	(A)
DROPOUT	0.9						sc
							I
	0.8
	0.7
	0.6
	0.5
	0	1.0	2.0	3.0	4.0	5.0	6.0

OUTPUT CURRENT (A)

7.0
6.8
6.6
6.4
6.2
6.0
5.8
5.6
5.4
5.2
5.0
±60	±40	±20	0	20	40	60	80	100	120	140
				TEMPERATURE (°C)

Figure 3. Load Regulation vs Temperature

	0.1
	0.05
(%)
REGULATION	0
	±0.05
LOAD	±0.1
	±0.15
	±0.2
	±60	±40	±20	0	20	40	60	80	100	120	140
					TEMPERATURE (°C)

Figure 4. LT1585A Reference Voltage vs

	1.275				Temperature
	1.27
	1.265
	1.26
(V)	1.255
	1.25
ref
V	1.245
	1.24
	1.235
	1.23
	1.225
	±60	±40	±20	0	20	40	60	80	100	120	140	160
					TEMPERATURE (°C)

Figure 5. LT1585A±1.5 Output Voltage vs

Figure 6. LT1585A±1.5 Quiescent Current vs

					Temperature												Temperature
	1.515												10
													9.5
	1.51												9.0
	1.505												8.5
													8.0
(V)												(mA)
	1.5												7.5
out												q
V												I	7.0
	1.495												6.5
	1.49												6.0
													5.5
	1.485												5.0
	±60	±40	±20	0	20	40	60	80	100	120	140		±60	±40	±20	0	20	40	60	80	100	120	140
					TEMPERATURE (°C)												TEMPERATURE (°C)

MOTOROLA ANALOG IC DEVICE DATA	3