Linear Technology LT1761ES5-2.5, LT1761ES5-2, LT1761ES5-1.8, LT1761ES5-5, LT1761ES5-3.3 Datasheet

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FEATURES

■Tiny 5-Lead SOT-23 Package

■Low Noise: 20 VRMS (10Hz to 100kHz)

■Low Quiescent Current: 20 A

■Wide Input Voltage Range: 1.8V to 20V

■Output Current: 100mA

■Very Low Shutdown Current: < 0.1 A

■Low Dropout Voltage: 300mV at 100mA

■Fixed Output Voltages: 1.5V, 1.8V, 2V, 2.5V, 2.8V, 3V, 3.3V, 5V

■Adjustable Output from 1.22V to 20V

■Stable with 1 F Output Capacitor

■Stable with Aluminum, Tantalum or Ceramic Capacitors

■Reverse Battery Protected

■No Reverse Current

■No Protection Diodes Needed

■Overcurrent and Overtemperature Protected

APPLICATIOUS

■Cellular Phones

■Pagers

■Battery-Powered Systems

■Frequency Synthesizers

■Wireless Modems

LT1761 Series

100mA, Low Noise,

LDO Micropower

Regulators in SOT-23

DESCRIPTIOU

The LT®1761 series are micropower, low noise, low dropout regulators. With an external 0.01 F bypass capacitor, output noise drops to 20 VRMS over a 10Hz to 100kHz bandwidth. Designed for use in battery-powered systems, the low 20 A quiescent current makes them an ideal choice. In shutdown, quiescent current drops to less than 0.1 A. The devices are capable of operating over an input voltage from 1.8V to 20V, and can supply 100mA of output current with a dropout voltage of 300mV. Quiescent current is well controlled, not rising in dropout as it does with many other regulators.

The LT1761 regulators are stable with output capacitors as low as 1 F. Small ceramic capacitors can be used without the series resistance required by other regulators.

Internal protection circuitry includes reverse battery protection, current limiting, thermal limiting and reverse current protection. The device is available in fixed output voltages of 1.5V, 1.8V, 2V, 2.5V, 2.8V, 3V, 3.3V and 5V, and as an adjustable device with a 1.22V reference voltage. The LT1761 regulators are available in the 5-lead SOT-23 package.

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

TYPICAL APPLICATIOU

10Hz to 100kHz Output Noise

5V Low Noise Regulator

OUT

5V AT100mA

VIN

20 VRMS NOISE

5.4V TO

LT1761-5

0.01 F

10 F

VOUT

20 VRMS

20V

100 V/DIV

SHDN

BYP

GND

1761 TA01

1761 G48

LT1761 Series

ABSOLUTE

WAXIWUW

RATIUGS (Note 1)

IN Pin Voltage ........................................................	±20V
OUT Pin Voltage ....................................................	±20V
Input to Output Differential Voltage .......................	±20V
ADJ Pin Voltage ......................................................	±7V
BYP Pin Voltage....................................................	±0.6V
SHDN Pin Voltage .................................................	±20V

Output Short-Circut Duration..........................	Indefinite
Operating Junction Temperature Range	– 40°C to 125°C
(Note 2) ............................................	– 40°C to 125°C
Storage Temperature Range .................	– 65°C to 150°C
Lead Temperature (Soldering, 10 sec)..................	300°C

PACKAGE/ORDER IUFORWATIOU

TOP VIEW

IN 1

5 OUT

IN 1

5 OUT

IN 1

5 OUT

GND 2

BYP 3

4 ADJ

SHDN 3

4 ADJ

SHDN 3

4 BYP

S5 PACKAGE

5-LEAD PLASTIC SOT-23

TJMAX = 150°C, θJA = 250°C/ W

SEE THE APPLICATIONS INFORMATION SECTION.

ORDER PART

S5 PART

ORDER PART

S5 PART

ORDER PART

S5 PART

NUMBER

MARKING

NUMBER

MARKING

NUMBER

MARKING

LT1761ES5-BYP

LTGC

LT1761ES5-SD

LTGH

LT1761ES5-1.5

LTMT

LT1761ES5-1.8

LTJM

LT1761ES5-2

LTJE

LT1761ES5-2.5

LTGD

LT1761ES5-2.8

LTLB

LT1761ES5-3

LTGE

LT1761ES5-3.3

LTGF

LT1761ES5-5

LTGG

Consult factory for parts specified with wider operating temperature ranges.

ELECTRICAL CHARACTERISTICS

The ● denotes specifications which apply over the full operating temperature range, otherwise specifications are TA = 25°C. (Note 2)

PARAMETER	CONDITIONS				MIN	TYP	MAX	UNITS

Minimum Input Voltage (Notes 3, 11)	ILOAD = 100mA			●		1.8	2.3	V
Regulated Output Voltage	LT1761-1.5	VIN = 2V, ILOAD = 1mA			1.478	1.5	1.522	V
(Note 4)		2.5V	< VIN < 20V, 1mA < ILOAD < 50mA	●	1.457	1.5	1.538	V
		2.5V	< VIN < 20V, 1mA < ILOAD < 100mA	●	1.436	1.5	1.555	V
	LT1761-1.8	VIN = 2.3V, ILOAD = 1mA			1.775	1.8	1.825	V
		2.8V	< VIN < 20V, 1mA < ILOAD < 50mA	●	1.750	1.8	1.845	V
		2.8V	< VIN < 20V, 1mA < ILOAD < 100mA	●	1.725	1.8	1.860	V
	LT1761-2	VIN = 2.5V, ILOAD = 1mA			1.970	2	2.030	V
		3V < VIN < 20V, 1mA < ILOAD < 50mA		●	1.945	2	2.045	V
		3V < VIN < 20V, 1mA < ILOAD < 100mA		●	1.920	2	2.060	V
	LT1761-2.5	VIN = 3V, ILOAD = 1mA			2.465	2.5	2.535	V
		3.5V	< VIN < 20V, 1mA < ILOAD < 50mA	●	2.435	2.5	2.565	V
		3.5V	< VIN < 20V, 1mA < ILOAD < 100mA	●	2.415	2.5	2.575	V

LT1761 Series

ELECTRICAL CHARACTERISTICS

The ● denotes specifications which apply over the full operating temperature range, otherwise specifications are TA = 25°C. (Note 2)

PARAMETER	CONDITIONS			MIN	TYP	MAX	UNITS

Regulated Output Voltage	LT1761-2.8	VIN = 3.3V, ILOAD = 1mA		2.762	2.8	2.838	V
(Note 4)		3.8V < VIN < 20V, 1mA < ILOAD < 50mA	●	2.732	2.8	2.868	V
		3.8V < VIN < 20V, 1mA < ILOAD < 100mA	●	2.706	2.8	2.884	V
	LT1761-3	VIN = 3.5V, ILOAD = 1mA		2.960	3	3.040	V
		4V < VIN < 20V, 1mA < ILOAD < 50mA	●	2.930	3	3.070	V
		4V < VIN < 20V, 1mA < ILOAD < 100mA	●	2.900	3	3.090	V
	LT1761-3.3	VIN = 3.8V, ILOAD = 1mA		3.250	3.3	3.350	V
		4.3V < VIN < 20V, 1mA < ILOAD < 50mA	●	3.230	3.3	3.370	V
		4.3V < VIN < 20V, 1mA < ILOAD < 100mA	●	3.190	3.3	3.400	V
	LT1761-5	VIN = 5.5V, ILOAD = 1mA		4.935	5	5.065	V
		6V < VIN < 20V, 1mA < ILOAD < 50mA	●	4.900	5	5.100	V
		6V < VIN < 20V, 1mA < ILOAD < 100mA	●	4.850	5	5.120	V
ADJ Pin Voltage	LT1761	VIN = 2V, ILOAD = 1mA		1.205	1.220	1.235	V
(Note 3, 4)		2.3V < VIN < 20V, 1mA < ILOAD < 50mA	●	1.190	1.220	1.250	V
		2.3V < VIN < 20V, 1mA < ILOAD < 100mA	●	1.170	1.220	1.260	V
Line Regulation	LT1761-1.5	VIN = 2V to 20V, ILOAD = 1mA	●		1	10	mV
	LT1761-1.8	VIN = 2.3V to 20V, ILOAD = 1mA	●		1	10	mV
	LT1761-2	VIN = 2.5V to 20V, ILOAD = 1mA	●		1	10	mV
	LT1761-2.5	VIN = 3V to 20V, ILOAD = 1mA	●		1	10	mV
	LT1761-2.8	VIN = 3.3V to 20V, ILOAD = 1mA	●		1	10	mV
	LT1761-3	VIN = 3.5V to 20V, ILOAD = 1mA	●		1	10	mV
	LT1761-3.3	VIN = 3.8V to 20V, ILOAD = 1mA	●		1	10	mV
	LT1761-5	VIN = 5.5V to 20V, ILOAD = 1mA	●		1	10	mV
	LT1761(Note 3) VIN = 2V to 20V, ILOAD = 1mA		●		1	10	mV
Load Regulation	LT1761-1.5	VIN = 2.5V, ILOAD = 1mA to 50mA			10	20	mV
		VIN = 2.5V, ILOAD = 1mA to 50mA	●			35	mV
		VIN = 2.5V, ILOAD = 1mA to 100mA			14	30	mV
		VIN = 2.5V, ILOAD = 1mA to 100mA	●			55	mV
	LT1761-1.8	VIN = 2.8V, ILOAD = 1mA to 50mA			10	20	mV
		VIN = 2.8V, ILOAD = 1mA to 50mA	●			35	mV
		VIN = 2.8V, ILOAD = 1mA to 100mA			15	30	mV
		VIN = 2.8V, ILOAD = 1mA to 100mA	●			60	mV
	LT1761-2	VIN = 3V, ILOAD = 1mA to 50mA			10	20	mV
		VIN = 3V, ILOAD = 1mA to 50mA	●			35	mV
		VIN = 3V, ILOAD = 1mA to 100mA			15	35	mV
		VIN = 3V, ILOAD = 1mA to 100mA	●			65	mV
	LT1761-2.5	VIN = 3.5V, ILOAD = 1mA to 50mA			10	20	mV
		VIN = 3.5V, ILOAD = 1mA to 50mA	●			35	mV
		VIN = 3.5V, ILOAD = 1mA to 100mA			20	40	mV
		VIN = 3.5V, ILOAD = 1mA to 100mA	●			80	mV
	LT1761-2.8	VIN = 3.8V, ILOAD = 1mA to 50mA			10	20	mV
		VIN = 3.8V, ILOAD = 1mA to 50mA	●			38	mV
		VIN = 3.8V, ILOAD = 1mA to 100mA			20	40	mV
		VIN = 3.8V, ILOAD = 1mA to 100mA	●			86	mV
	LT1761-3	VIN = 4V, ILOAD = 1mA to 50mA			10	20	mV
		VIN = 4V, ILOAD = 1mA to 50mA	●			40	mV
		VIN = 4V, ILOAD = 1mA to 100mA			20	40	mV
		VIN = 4V, ILOAD = 1mA to 100mA	●			90	mV

LT1761 Series

ELECTRICAL CHARACTERISTICS

The ● denotes specifications which apply over the full operating temperature range, otherwise specifications are TA = 25°C. (Note 2)

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Load Regulation

LT1761-3.3

VIN = 4.3V, ILOAD = 1mA to 50mA

●

VIN = 4.3V, ILOAD = 1mA to 100mA

●

100

LT1761-5

VIN = 6V, ILOAD = 1mA to 50mA

●

VIN = 6V, ILOAD = 1mA to 100mA

●

150

LT1761 (Note 3) VIN = 2.3V, ILOAD = 1mA to 50mA

VIN = 2.3V, ILOAD = 1mA to 50mA

●

VIN = 2.3V, ILOAD = 1mA to 100mA

●

Dropout Voltage

ILOAD = 1mA

0.10

0.15

VIN = VOUT(NOMINAL)

ILOAD = 1mA

●

0.19

(Notes 5, 6, 11)

ILOAD = 10mA

0.17

0.22

ILOAD = 10mA

●

0.29

ILOAD = 50mA

0.24

0.28

ILOAD = 50mA

●

0.38

ILOAD = 100mA

0.30

0.35

ILOAD = 100mA

●

0.45

GND Pin Current

ILOAD = 0mA

●

µA

VIN = VOUT(NOMINAL)

ILOAD = 1mA

●

100

µA

(Notes 5, 7)

ILOAD = 10mA

●

230

400

µA

ILOAD = 50mA

●

ILOAD = 100mA

●

2.2

Output Voltage Noise

COUT = 10µF, CBYP = 0.01µF, ILOAD = 100mA, BW = 10Hz to 100kHz

µVRMS

ADJ Pin Bias Current

(Notes 3, 8)

100

Shutdown Threshold

VOUT = Off to On

●

0.8

VOUT = On to Off

●

0.25

0.65

= 0V

0.5

µA

SHDN

Pin Current

●

SHDN

(Note 9)

= 20V

●

µA

SHDN

Quiescent Current in Shutdown

VIN = 6V, V

= 0V

0.01

0.1

µA

SHDN

Ripple Rejection (Note 3)

VIN – VOUT = 1.5V (Avg), VRIPPLE = 0.5VP-P, fRIPPLE = 120Hz,

ILOAD = 50mA

Current Limit

VIN = 7V, VOUT = 0V

200

VIN = VOUT(NOMINAL) + 1V, VOUT = – 5%

●

110

Input Reverse Leakage Current

VIN = – 20V, VOUT = 0V

●

Reverse Output Current

LT1761-1.5

VOUT = 1.5V, VIN < 1.5V

µA

(Note 10)

LT1761-1.8

VOUT = 1.8V, VIN < 1.8V

µA

LT1761-2

VOUT = 2V, VIN < 2V

µA

LT1761-2.5

VOUT = 2.5V, VIN < 2.5V

µA

LT1761-2.8

VOUT = 2.8V, VIN < 2.8V

µA

LT1761-3

VOUT = 3V, VIN < 3V

µA

LT1761-3.3

VOUT = 3.3V, VIN < 3.3V

µA

LT1761-5

VOUT = 5V, VIN < 5V

µA

LT1761 (Note 3) VOUT = 1.22V, VIN < 1.22V

µA

Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired.

Note 2: The LT1761 regulators are tested and specified under pulse load conditions such that TJ ≈ TA. The LT1761 is 100% production tested at

TA = 25°C. Performance at – 40°C and 125°C is assured by design, characterization and correlation with statistical process controls.

Note 3: The LT1761 (adjustable versions) are tested and specified for these conditions with the ADJ pin connected to the OUT pin.

Linear Technology LT1761ES5-2.5, LT1761ES5-2, LT1761ES5-1.8, LT1761ES5-5, LT1761ES5-3.3 Datasheet

LT1761 Series

ELECTRICAL CHARACTERISTICS

Note 4: Operating conditions are limited by maximum junction temperature. The regulated output voltage specification will not apply for all possible combinations of input voltage and output current. When operating at maximum input voltage, the output current range must be limited. When operating at maximum output current, the input voltage range must be limited.

Note 5: To satisfy requirements for minimum input voltage, the LT1761 (adjustable version) is tested and specified for these conditions with an external resistor divider (two 250k resistors) for an output voltage of 2.44V. The external resistor divider will add a 5 A DC load on the output. Note 6: Dropout voltage is the minimum input to output voltage differential needed to maintain regulation at a specified output current. In dropout, the output voltage will be equal to: VIN – VDROPOUT.

Note 7: GND pin current is tested with VIN = VOUT(NOMINAL) or VIN = 2.3V (whichever is greater) and a current source load. This means the device is

tested while operating in its dropout region or at the minimum input voltage specification. This is the worst-case GND pin current. The GND pin current will decrease slightly at higher input voltages.

Note 8: ADJ pin bias current flows into the ADJ pin.

Note 9: SHDN pin current flows into the SHDN pin.

Note 10: Reverse output current is tested with the IN pin grounded and the OUT pin forced to the rated output voltage. This current flows into the OUT pin and out the GND pin.

Note 11: For the LT1761, LT1761-1.5, LT1761-1.8 and LT1761-2 dropout voltage will be limited by the minimum input voltage specification under some output voltage/load conditions. See the curve of Minimum Input Voltage in the Typical Performance Characteristics.

TYPICAL PERFORWAUCE CHARACTERISTICS

	Typical Dropout Voltage															Guaranteed Dropout Voltage
	500															500
	450															450	= TEST POINTS
	450															450
(mV)	400														(mV)	400
	400															400

	350					TJ = 125				°C						350						TJ		≤ 125		°C
	350					TJ = 125				°C						350						TJ		≤ 125		°C
VOLTAGE	300														VOLTAGE	300
	300															300
	250															250							TJ	≤ 25		°C
	250															250							TJ	≤ 25		°C
DROPOUT	200						TJ	= 25		°C					DROPOUT	200
	200						TJ	= 25		°C						200
	150															150
	150															150
	100															100
	100															100
	50															50
	50															50
	0															0
	0				40											0				40
	0	10	20	30	40	50			60		70	80	90	100		0	10	20	30	40	50				60		70	80	90	100
				OUTPUT CURRENT (mA)															OUTPUT CURRENT (mA)
													1761 G00																1761 G01

DROPOUT VOLTAGE (mV)

Dropout Voltage

500
500
450
450
400
400
350
350	IL = 100mA
300	IL = 100mA
300
250
200		I		L = 50mA
200
150
			IL = 10mA


100
100				IL = 1mA
50				IL = 1mA


0
0

–50 –25 0 25 50 75 100 125 TEMPERATURE (°C)

1761 G01.1

QUIESCENT CURRENT ( A)

Quiescent Current

VIN = 6V

35RL = ∞ (250k FOR LT1761-BYP, -SD) IL = 0 (5 A FOR LT1761-BYP, -SD)

VSHDN = VIN

VSHDN = 0V

–50	–25	0	25	50	75	100	125
		TEMPERATURE (°C)

LT1761-1.5

Output Voltage

	1.528
	1.521	IL = 1mA


(V)	1.514
	1.514

VOLTAGE	1.507
	1.507
OUTPUT	1.500
	1.500
	1.493
	1.493
	1.486
	1.486
	1.479
	1.479
	1.472
	1.472		–25	0	25	50	75	100	125
	–50		–25	0	25	50	75	100	125

TEMPERATURE (°C)

LT1761-1.8

Output Voltage

	1.84
	1.83	IL = 1mA


(V)	1.82
	1.82

VOLTAGE	1.81
	1.81
OUTPUT	1.80
	1.80
	1.79
	1.79
	1.78
	1.78
	1.77
	1.77
	1.76
	1.76		–25	0	25	50	75	100	125
	–50		–25	0	25	50	75	100	125

TEMPERATURE (°C)

1761 G03

1761 G51

1761 G06

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