Linear Technology LT1117CST, LT1117CM-5, LT1117CM-3.3, LT1117CM-2.85, LT1117IST-5 Datasheet

LT1117/LT1117-2.85

LT1117-3.3/LT1117-5

800mA Low Dropout

Positive Regulators

Adjustable and Fixed 2.85V,

3.3V, 5V

FEATURES

■Space Saving SOT-223 Surface Mount Package

■3-Terminal Adjustable or Fixed 2.85V, 3.3V, 5V

■Output Current of 800mA

■Operates Down to 1V Dropout

■Guaranteed Dropout Voltage at Multiple Current Levels

■0.2% Line Regulation Max

■0.4% Load Regulation Max

APPLICATIOUS

■Active SCSI Terminators

■High Efficiency Linear Regulators

■Post Regulators for Switching Supplies

■Battery Chargers

■5V to 3.3V Linear Regulators

DESCRIPTIOU

The LT®1117 is a positive low dropout regulator designed to provide up to 800mA of output current. The device is available in an adjustable version and fixed output voltages of 2.85V, 3.3V and 5V. The 2.85V version is designed specifically to be used in Active Terminators for the SCSI bus. All internal circuitry is designed to operate down to 1V input to output differential. Dropout voltage is guaranteed at a maximum of 1.2V at 800mA, decreasing at lower load currents. On chip trimming adjusts the reference/output voltage to within ± 1%. Current limit is also trimmed in order to minimize the stress on both the regulator and the power source circuitry under overload conditions.

The low profile surface mount SOT-223 package allows the device to be used in applications where space is limited. The LT1117 requires a minimum of 10 F of output capacitance for stability. Output capacitors of this size or larger are normally included in most regulator designs.

Unlike PNP type regulators where up to 10% of the output current is wasted as quiescent current, the quiescent current of the LT1117 flows into the load, increasing efficiency.

, LTC and LT are registered trademarks of Linear Technology Corporation.

TYPICAL APPLICATIOU

	Active Terminator for SCSI-2 Bus
				110Ω
				110Ω
		LT1117-2.85		110Ω	18 TO 27
	IN	OUT
					LINES
4.75V TO	+	GND	+
				110Ω
5.25V	10µF		22µF
				LT1117 • TA01

Dropout Voltage (VIN – VOUT)

	1.4
	–40°C ≤ TJ < 0°C
	1.2
(V)	0°C ≤ TJ ≤ 125°C
	1.0
VOLTAGE	TJ = 25°C
	0.8
	TJ = 125°C
DROPOUT	0.6
	0.4
	0.2

INDICATES GUARANTEED TEST POINT 0

0	100	200	300	400	500	600	700	800
		OUTPUT CURRENT (mA)

LT1117 • TPC01

1

LT1117/LT1117-2.85 LT1117-3.3/LT1117-5

ABSOLUTE

WAXIWUW

RATIUGS (Note 1)

Input Voltage		Operating JunctionTemperature Range
Operating Voltage		C Grade .................................................	0°C to 125°C
LT1117, LT1117-3.3, LT1117-5 ......................	15V	I Grade .............................................	– 40°C to 125°C
LT1117-2.85 ...................................................	10V	Storage Temperature Range .................	– 65°C to 150°C
Surge Voltage		Lead Temperature ...................	(See Soldering Methods)
LT1117, LT1117-3.3, LT1117-5 ......................	20V

PACKAGE/ORDER IUFORWATIOU

	FRONT VIEW
TAB IS		3		IN
		2		OUT
VOUT
		1		ADJ/GND

ST PACKAGE

3-LEAD PLASTIC SOT-223

TJ MAX = 125°C,θJC = 15°C/W

ORDER PART

NUMBER

LT1117CST LT1117CST-2.85 LT1117CST-3.3 LT1117CST-5 LT1117IST LT1117IST-2.85 LT1117IST-3.3 LT1117IST-5

ST PART MARKING

1117 1117I

11172 11172I

11173 11173I

11175 11175I

		FRONT VIEW
TAB IS		3		IN
		2		OUT
VOUT
		1		ADJ/GND
		M PACKAGE
3-LEAD PLASTIC DD
TJ MAX = 125°C,θJC = 10°C/W

ORDER PART

NUMBER

LT1117CM LT1117CM-2.85 LT1117CM-3.3 LT1117CM-5

DD PART MARKING

1117

11172

11173

11175

Consult factory for Military grade parts.

ELECTRICAL CHARACTERISTICS

The ● denotes specifications which apply over the full operating temperature range, otherwise specifications are at TJ = 25°C.

PARAMETER		CONDITIONS			MIN	TYP	MAX	UNITS
Reference Voltage	LT1117	IOUT = 10mA, (VIN – VOUT) = 2V, TJ = 25°C			1.238	1.250	1.262	V
		10 ≤ IOUT ≤ 800mA, 1.4V ≤ (VIN – VOUT) ≤ 10V		●	1.225	1.250	1.270	V
Output Voltage	LT1117-2.85	IOUT = 10mA, VIN = 4.85V, TJ = 25°C			2.820	2.850	2.880	V
		0 ≤ IOUT ≤ 800mA, 4.25V ≤ VIN ≤ 10V		●	2.790	2.850	2.910	V
		0 ≤ IOUT ≤ 500mA, VIN = 3.95V		●	2.790	2.850	2.910	V
	LT1117-3.3	IOUT = 10mA, VIN = 5V, TJ = 25°C			3.267	3.300	3.333	V
		0 ≤ IOUT ≤ 800mA, 4.75V ≤ VIN ≤ 10V		●	3.235	3.300	3.365	V
	LT1117-5	IOUT = 10mA, VIN = 7V, TJ = 25°C			4.950	5.000	5.050	V
		0 ≤ IOUT ≤ 800mA, 6.50V ≤ VIN ≤ 12V		●	4.900	5.000	5.100	V
Line Regulation	LT1117	IOUT = 10mA, 1.5V	≤ VIN – VOUT ≤ 15V (Note 2)	●		0.035	0.2	%
	LT1117-2.85	IOUT = 0mA, 4.25V	≤ VIN ≤ 10V (Note 2)	●		1	6	mV
	LT1117-3.3	IOUT = 0mA, 4.75V	≤ VIN ≤ 15V (Note 2)	●		1	6	mV
	LT1117-5	IOUT = 0mA, 6.5V ≤ VIN ≤ 15V (Note 2)		●		1	10	mV

2

LT1117/LT1117-2.85

LT1117-3.3/LT1117-5

ELECTRICAL CHARACTERISTICS

The ● denotes specifications which apply over the full operating temperature range, otherwise specifications are at TJ = 25°C.

PARAMETER		CONDITIONS			MIN	TYP	MAX	UNITS
Load Regulation	LT1117	(VIN – VOUT) = 3V, 10mA ≤ IOUT ≤ 800mA (Note 2)		●		0.1	0.4	%
	LT1117-2.85	VIN = 4.25V, 0 ≤ IOUT	≤ 800mA (Note 2)	●		1	10	mV
	LT1117-3.3	VIN = 4.75V, 0 ≤ IOUT	≤ 800mA (Note 2)	●		1	10	mV
	LT1117-5	VIN = 6.5V, 0 ≤ IOUT ≤ 800mA (Note 2)		●		1	15	mV
Dropout Voltage		IOUT = 100mA, 0°C ≤ TJ ≤ 125°C (Note 3)				1.00	1.10	V
		IOUT = 500mA, 0°C ≤ TJ ≤ 125°C (Note 3)				1.05	1.15	V
		IOUT = 800mA, 0°C ≤ TJ ≤ 125°C (Note 3)				1.10	1.20	V
		IOUT = 100mA, – 40°C ≤ TJ < 0°C (Note 3)				1.00	1.20	V
		IOUT = 500mA, – 40°C ≤ TJ < 0°C (Note 3)				1.05	1.25	V
		IOUT = 800mA, – 40°C ≤ TJ < 0°C (Note 3)				1.10	1.30	V
Current Limit		(VIN – VOUT) = 5V, TJ = 25°C,			800	950	1200	mA
Minimum Load Current	LT1117	(VIN – VOUT) = 15V (Note 4)		●		1.7	5	mA
Quiescent Current	LT1117-2.85	VIN ≤ 10V		●		5	10	mA
	LT1117-3.3	VIN ≤ 15V		●		5	10	mA
	LT1117-5	VIN ≤ 15V		●		5	10	mA
Thermal Regulation		TA = 25°C, 30ms Pulse				0.01	0.1	%/W
Ripple Rejection		fRIPPLE = 120Hz, (VIN – VOUT) = 3V, VRIPPLE = 1VP-P		●	60	75		dB
Adjust Pin Current				●		55	120	A
Adjust Pin Current Change		10mA ≤ IOUT ≤ 800mA, 1.4V ≤ (VIN – VOUT) ≤ 10V		●		0.2	5	A
Temperature Stability						0.5		%
Long Term Stability		TA = 125°C, 1000Hrs				0.3		%
RMS Output Noise		(% of VOUT), 10Hz ≤ f ≤ 10kHz				0.003		%
Thermal Resistance		(Junction-to-Case, at Tab)				15		°C/W

Note 1: Absolute Maximum Ratings are those values beyond which the life to the device may be imparied.

Note 2: See thermal regulation specification for changes in output voltage due to heating effects. Load regulation and line regulation are measured at a constant junction temperature by low duty cycle pulse testing.

Note 3: Dropout voltage is specified over the full output current range of the device. Dropout voltage is defined as the minimum input/output differential measured at the specified output current. Test points and limits are also shown on the Dropout Voltage curve.

Note 4: Minimum load current is defined as the minimum output current required to maintain regulation.

TYPICAL PERFORWAUCE CHARACTERISTICS

	Minimum Operating Current
	(Adjustable Device)											Short-Circuit Current
4											1.25
CURRENTOPERATINGMINIMUM(mA)
										CURRENTCIRCUITSHORT(A)	1.00							TJ = 125	°C
3					TJ = 125°C						0.75						TJ = 25°C
2					TJ = 25°C
											0.50
					TJ = –55°C
1											0.25
0											0
	5		10		15			20				5				10					15
0											0
	INPUT/OUTPUT DIFFERENTIAL (V)											INPUT/OUTPUT DIFFERENTIAL (V)
						LT1117 • TPC02												LT1117 • TPC03

Load Regulation

	0.10
			ILOAD = 800mA
(%)	0.05
DEVIATION
	0
VOLTAGE
	–0.05
OUTPUT	–0.10
	–0.15
	–0.20
			–25		0		25		50		75		100		125
	–50

TEMPERATURE (°C)

LT1117 • TPC04

3

LT1117/LT1117-2.85

LT1117-3.3/LT1117-5

TYPICAL PERFORWAUCE CHARACTERISTICS

		LT1117 Ripple Rejection						LT1117 Ripple Rejection vs Current						Temperature Stability
	100							100	VOUT = 5V					2.0
	90		VRIPPLE ≤ 3VP-P		VRIPPLE ≤			90
					0.5VP-P				CADJ = 25 F
RIPPLE REJECTION (dB)	80				(VIN – VOUT) ≥ 3V		RIPPLE REJECTION (dB)	80	COUT = 25 F		fRIPPLE = 120Hz		(%)	1.0
	70							70		VRIPPLE ≤ 3VP-P			OUTPUT VOLTAGE CHANGE
	60							60
	50							50			fRIPPLE = 20kHz			0
	40			(VIN – VOUT) ≥ VDROPOUT				40		VRIPPLE ≤ 0.5VP-P
	30
								30						–1.0
	20							20
		CADJ = 200 F AT f < 60Hz
	10	CADJ = 25 F AT f > 60Hz						10
	0	IOUT = 0.5A						0						–2.0
		10	100	1k	10k	100k			0.2	0.4	0.6	0.8			–25	0	25	50	75	100	125	150
								0						–50

FREQUENCY (Hz)	OUTPUT CURRENT (A)	TEMPERATURE (°C)
LT1117 • TPC05	LT1117 • TPC06	LT1117 • TPC07

AJUST PIN CURRENT ( A)

Adjust Pin Current

100
90
80
70
60
50
40
30
20
10
0	–25	0	25	50	75	100	125	150
–50

TEMPERATURE (°C)

LT1117-2.85

Load Transient Response

		0.3	CIN = 10 F
OUPUT VOLTAGE
	DEVIATION (V)	0.2	COUT = 10 F TANTALUM
			VIN = 4.25V
		0.1	PRELOAD = 0.1A
		0
		–0.1
		–0.2
CURRENT		0.5
	(A)	0
LOAD		–0.5
		0	10	20	30	40	50	60	70	80	90	100

TIME ( s)

LT1117-5

Load Transient Response

		0.3	CIN = 10 F
OUPUT VOLTAGE
	DEVIATION (V)	0.2	COUT = 10 F TANTALUM
			VIN = 6.5V
		0.1	PRELOAD = 0.1A
		0
		–0.1
		–0.2
CURRENT		0.5
	(A)	0
LOAD		–0.5
		0	10	20	30	40	50	60	70	80	90	100

TIME ( s)

LT1117 • TPC08

LT1117 • TPC09

LT1117 • TPC10

LT1117-2.8

Line Transient Response

		60	CIN = 1 F
OUPUT VOLTAGE	DEVIATION (mV)
		40	COUT = 10 F TANTALUM
			IOUT = 0.1A
		20
		0
		–20
		–40
VOLTAGE		5.25
	(V)	4.25
INPUT		3.25	0	20	40	60	80	100 120 140 160 180 200

TIME ( s)

LT1117-5

Line Transient Response

		60		CIN = 1 F
OUPUT VOLTAGE	DEVIATION (mV)
		40		COUT = 10 F TANTALUM
		20		IOUT = 0.1A
		0
		–20
		–40
VOLTAGE		7.50
	(V)	6.50
INPUT		5.50
		0	20	40	60	80	100	120 140 160 180 200

TIME ( s)

LT1117 • TPC11

LT1117 • TPC12

4