ANALOG DEVICES LT 1761 ES5-5 Datasheet

LT1761 Series

100mA, Low Noise,

LDO Micropower

Regulators in TSOT-23

FEATURES

n

Low Noise: 20μV

n

Low Quiescent Current: 20μA

n

Wide Input Voltage Range: 1.8V to 20V

n

Output Current: 100mA

n

Very Low Shutdown Current: <0.1μA

n

Low Dropout Voltage: 300mV at 100mA

n

Fixed Output Voltages: 1.2V, 1.5V, 1.8V, 2V, 2.5V,

(10Hz to 100kHz)

RMS

2.8V, 3V, 3.3V, 5V

n

Adjustable Output from 1.22V to 20V

n

Stable with 1μF Output Capacitor

n

Stable with Aluminum, Tantalum or

Ceramic Capacitors

n

Reverse-Battery Protected

n

No Reverse Current

n

No Protection Diodes Needed

n

Overcurrent and Overtemperature Protected

n

Available in Tiny 5-Lead TSOT-23 Package

APPLICATIONS

n

Cellular Phones

n

Pagers

n

Battery-Powered Systems

n

Frequency Synthesizers

n

Wireless Modems

DESCRIPTION

The LT®1761 series are micropower, low noise, low
dropout regulators. With an external 0.01μF bypass
capacitor, output noise drops to 20μV
100kHz bandwidth. Designed for use in battery-powered
systems, the low 20μA quiescent current makes them an
ideal choice. In shutdown, quiescent current drops to less
than 0.1μA. 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 1μF. 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 fi xed output
voltages of 1.2V, 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
TSOT-23 package.

L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.

over a 10Hz to

RMS

TYPICAL APPLICATION

5V Low Noise Regulator

V

5.4V TO
20V

IN

1μF

IN

SHDN

OUT

LT1761-5

BYP

GND

0.01μF

+

5V AT100mA
20μV

10μF

1761 TA01

RMS

NOISE

V

OUT

100μV/DIV

10Hz to 100kHz Output Noise

1761 TA01b

20μV

RMS

1761sfe

1

LT1761 Series

ABSOLUTE MAXIMUM RATINGS

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

(Note 1)

Output Short-Circuit Duration ........................ Indefi nite

Operating Junction Temperature Range

E, I Grade (Note 2) ............................. –40°C to 125°C

MP Grade (Note 2) ............................. –55°C to 125°C

Storage Temperature Range ................... –65°C to 150°C

Lead Temperature (Soldering, 10 sec) ..................300°C

PIN CONFIGURATION

LT1761-BYP LT1761-SD LT1761-X

GND 2

BYP 3

SEE APPLICATIONS INFORMATION SECTION

TOP VIEW

IN 1

S5 PACKAGE

5-LEAD PLASTIC TSOT-23

T

= 150°C, θJA = 250°C/W

JMAX

5 OUT

4 ADJ

TOP VIEW

IN 1

GND 2

SHDN 3

S5 PACKAGE

5-LEAD PLASTIC TSOT-23

T

= 150°C, θJA = 250°C/W

JMAX

SEE APPLICATIONS INFORMATION SECTION

5 OUT

4 ADJ

TOP VIEW

IN 1

GND 2

SHDN 3

S5 PACKAGE

5-LEAD PLASTIC TSOT-23

T

= 150°C, θJA = 250°C/W

JMAX

SEE APPLICATIONS INFORMATION SECTION

5 OUT

4 BYP

2

1761sfe

LT1761 Series

ORDER INFORMATION

LEAD FREE FINISH TAPE AND REEL PART MARKING * PACKAGE DESCRIPTION TEMPERATURE RANGE

LT1761ES5-BYP#PBF LT1761ES5-BYP#TRPBF LTGC 5-Lead Plastic TSOT-23 –40°C to 125°C
LT1761IS5-BYP#PBF LT1761IS5-BYP#TRPBF LTGC 5-Lead Plastic TSOT-23 –40°C to 125°C
LT1761ES5-SD#PBF LT1761ES5-SD#TRPBF LTGH 5-Lead Plastic TSOT-23 –40°C to 125°C
LT1761IS5-SD#PBF LT1761IS5-SD#TRPBF LTGH 5-Lead Plastic TSOT-23 –40°C to 125°C
LT1761ES5-1.2#PBF LT1761ES5-1.2#TRPBF LTCDS 5-Lead Plastic TSOT-23 –40°C to 125°C
LT1761IS5-1.2#PBF LT1761IS5-1.2#TRPBF LTCDS 5-Lead Plastic TSOT-23 –40°C to 125°C
LT1761ES5-1.5#PBF LT1761ES5-1.5#TRPBF LTMT 5-Lead Plastic TSOT-23 –40°C to 125°C
LT1761IS5-1.5#PBF LT1761IS5-1.5#TRPBF LTMT 5-Lead Plastic TSOT-23 –40°C to 125°C
LT1761ES5-1.8#PBF LT1761ES5-1.8#TRPBF LTJM 5-Lead Plastic TSOT-23 –40°C to 125°C
LT1761IS5-1.8#PBF LT1761IS5-1.8#TRPBF LTJM 5-Lead Plastic TSOT-23 –40°C to 125°C
LT1761MPS5-1.8#PBF LT1761MPS5-1.8#TRPBF LTDCH 5-Lead Plastic TSOT-23 –55°C to 125°C
LT1761ES5-2#PBF LT1761ES5-2#TRPBF LTJE 5-Lead Plastic TSOT-23 –40°C to 125°C
LT1761IS5-2#PBF LT1761IS5-2#TRPBF LTJE 5-Lead Plastic TSOT-23 –40°C to 125°C
LT1761ES5-2.5#PBF LT1761ES5-2.5#TRPBF LTGD 5-Lead Plastic TSOT-23 –40°C to 125°C
LT1761IS5-2.5#PBF LT1761IS5-2.5#TRPBF LTGD 5-Lead Plastic TSOT-23 –40°C to 125°C
LT1761ES5-2.8#PBF LT1761ES5-2.8#TRPBF LTLB 5-Lead Plastic TSOT-23 –40°C to 125°C
LT1761IS5-2.8#PBF LT1761IS5-2.8#TRPBF LTLB 5-Lead Plastic TSOT-23 –40°C to 125°C
LT1761ES5-3#PBF LT1761ES5-3#TRPBF LTGE 5-Lead Plastic TSOT-23 –40°C to 125°C
LT1761IS5-3#PBF LT1761IS5-3#TRPBF LTGE 5-Lead Plastic TSOT-23 –40°C to 125°C
LT1761ES5-3.3#PBF LT1761ES5-3.3#TRPBF LTGF 5-Lead Plastic TSOT-23 –40°C to 125°C
LT1761IS5-3.3#PBF LT1761IS5-3.3#TRPBF LTGF 5-Lead Plastic TSOT-23 –40°C to 125°C
LT1761ES5-5#PBF LT1761ES5-5#TRPBF LTGG 5-Lead Plastic TSOT-23 –40°C to 125°C
LT1761IS5-5#PBF LT1761IS5-5#TRPBF LTGG 5-Lead Plastic TSOT-23 –40°C to 125°C

LEAD BASED FINISH TAPE AND REEL PART MARKING * PACKAGE DESCRIPTION TEMPERATURE RANGE

LT1761ES5-BYP LT1761ES5-BYP#TR LTGC 5-Lead Plastic TSOT-23 –40°C to 125°C
LT1761IS5-BYP LT1761IS5-BYP#TR LTGC 5-Lead Plastic TSOT-23 –40°C to 125°C
LT1761ES5-SD LT1761ES5-SD#TR LTGH 5-Lead Plastic TSOT-23 –40°C to 125°C
LT1761IS5-SD LT1761IS5-SD#TR LTGH 5-Lead Plastic TSOT-23 –40°C to 125°C
LT1761ES5-1.2 LT1761ES5-1.2#TR LTCDS 5-Lead Plastic TSOT-23 –40°C to 125°C
LT1761IS5-1.2 LT1761IS5-1.2#TR LTCDS 5-Lead Plastic TSOT-23 –40°C to 125°C
LT1761ES5-1.5 LT1761ES5-1.5#TR LTMT 5-Lead Plastic TSOT-23 –40°C to 125°C
LT1761IS5-1.5 LT1761IS5-1.5#TR LTMT 5-Lead Plastic TSOT-23 –40°C to 125°C
LT1761ES5-1.8 LT1761ES5-1.8#TR LTJM 5-Lead Plastic TSOT-23 –40°C to 125°C
LT1761IS5-1.8 LT1761IS5-1.8#TR LTJM 5-Lead Plastic TSOT-23 –40°C to 125°C
LT1761MPS5-1.8 LT1761MPS5-1.8#TR LTDCH 5-Lead Plastic TSOT-23 –55°C to 125°C
LT1761ES5-2 LT1761ES5-2#TR LTJE 5-Lead Plastic TSOT-23 –40°C to 125°C
LT1761IS5-2 LT1761IS5-2#TR LTJE 5-Lead Plastic TSOT-23 –40°C to 125°C
LT1761ES5-2.5 LT1761ES5-2.5#TR LTGD 5-Lead Plastic TSOT-23 –40°C to 125°C
LT1761IS5-2.5 LT1761IS5-2.5#TR LTGD 5-Lead Plastic TSOT-23 –40°C to 125°C
LT1761ES5-2.8 LT1761ES5-2.8#TR LTLB 5-Lead Plastic TSOT-23 –40°C to 125°C
LT1761IS5-2.8 LT1761IS5-2.8#TR LTLB 5-Lead Plastic TSOT-23 –40°C to 125°C
LT1761ES5-3 LT1761ES5-3#TR LTGE 5-Lead Plastic TSOT-23 –40°C to 125°C
LT1761IS5-3 LT1761IS5-3#TR LTGE 5-Lead Plastic TSOT-23 –40°C to 125°C
LT1761ES5-3.3 LT1761ES5-3.3#TR LTGF 5-Lead Plastic TSOT-23 –40°C to 125°C
LT1761IS5-3.3 LT1761IS5-3.3#TR LTGF 5-Lead Plastic TSOT-23 –40°C to 125°C
LT1761ES5-5 LT1761ES5-5#TR LTGG 5-Lead Plastic TSOT-23 –40°C to 125°C
LT1761IS5-5 LT1761IS5-5#TR LTGG 5-Lead Plastic TSOT-23 –40°C to 125°C
Consult LTC Marketing for parts specifi ed with wider operating temperature ranges. *The temperature grade is identifi ed by a label on the shipping container.

For more information on lead free part marking, go to:
For more information on tape and reel specifi cations, go to:

http://www.linear.com/leadfree/

http://www.linear.com/tapeandreel/

1761sfe

3

LT1761 Series

ELECTRICAL CHARACTERISTICS

The l denotes the specifi cations which apply over the full operating
temperature range, otherwise specifi cations are at T

PARAMETER CONDITIONS MIN TYP MAX UNITS

Minimum Input Voltage (Notes 3, 11) I
Regulated Output Voltage (Note 4) LT1761-1.2 V

ADJ Pin Voltage (Note 3, 4) LT1761 V

Line Regulation LT1761-1.2

= 100mA

LOAD

LT1761-1.5 V

LT1761-1.8 VIN = 2.3V, I

LT1761-2 V

LT1761-2.5 V

LT1761-2.8 V

LT1761-3 V

LT1761-3.3 V

LT1761-5 V

LT1761-1.5
LT1761-1.8
LT1761-2
LT1761-2.5
LT1761-2.8
LT1761-3
LT1761-3.3
LT1761-5
LT1761 (Note 3)

= 25°C. (Note 2)

A

= 2V, I

IN

2.3V < V

2.3V < V
= 2V, I

IN

2.5V < V

2.5V < V

2.8V < V

2.8V < V
= 2.5V, I

IN

3V < V
3V < V

= 3V, I

IN

3.5V < V

3.5V < V
= 3.3V, I

IN

3.8V < V

3.8V < V
= 3.5V, I

IN

4V < V
4V < V

= 3.8V, I

IN

4.3V < V

4.3V < V
= 5.5V, I

IN

6V < V
6V < V

= 2V, I

IN

2.3V < V

2.3V < V

ΔV

= 2V to 20V, I

IN

ΔV

= 2V to 20V, I

IN

ΔV

= 2.3V to 20V, I

IN

ΔV

= 2.5V to 20V, I

IN

ΔV

= 3V to 20V, I

IN

ΔV

= 3.3V to 20V, I

IN

ΔV

= 3.5V to 20V, I

IN

ΔV

= 3.8V to 20V, I

IN

ΔV

= 5.5V to 20V, I

IN

ΔV

= 2V to 20V, I

IN

= 1mA

LOAD

< 20V, 1mA < I

IN

< 20V, 1mA < I

IN

= 1mA

LOAD

< 20V, 1mA < I

IN

< 20V, 1mA < I

IN

LOAD

< 20V, 1mA < I

IN

< 20V, 1mA < I

IN

LOAD

< 20V, 1mA < I

IN

< 20V, 1mA < I

IN

= 1mA

LOAD

< 20V, 1mA < I

IN

< 20V, 1mA < I

IN

LOAD

< 20V, 1mA < I

IN

< 20V, 1mA < I

IN

LOAD

< 20V, 1mA < I

IN

< 20V, 1mA < I

IN

LOAD

< 20V, 1mA < I

IN

< 20V, 1mA < I

IN

LOAD

< 20V, 1mA < I

IN

< 20V, 1mA < I

IN

= 1mA

LOAD

< 20V, 1mA < I

IN

< 20V, 1mA < I

IN

= 1mA

= 1mA

= 1mA

= 1mA

= 1mA

= 1mA

LOAD
LOAD

LOAD
LOAD

LOAD

LOAD
LOAD
LOAD
LOAD

LOAD

LOAD
LOAD

LOAD
LOAD

LOAD
LOAD

< 50mA

LOAD

< 100mA

LOAD

LOAD
LOAD

LOAD
LOAD

< 50mA

LOAD

< 100mA

LOAD

LOAD
LOAD

< 50mA

LOAD

< 100mA

LOAD

LOAD
LOAD

= 1mA
= 1mA

= 1mA
= 1mA

= 1mA

= 1mA
= 1mA
= 1mA
= 1mA

= 1mA

< 50mA
< 100mA

< 50mA
< 100mA

< 50mA
< 100mA

< 50mA
< 100mA

< 50mA
< 100mA

< 50mA
< 100mA

< 50mA
< 100mA

l

1.185

l

1.170

l

1.150

1.478

l

1.457

l

1.436

1.775

l

1.750

l

1.725

1.970

l

1.945

l

1.920

2.465

l

2.435

l

2.415

2.762

l

2.732

l

2.706

2.960

l

2.930

l

2.900

3.250

l

3.230

l

3.190

4.935

l

4.900

l

4.850

1.205

l

1.190

l

1.170

l
l
l
l
l
l
l
l
l
l

1.8 2.3 V

1.2

1.2

1.2

1.5

1.5

1.5

1.8

1.8

1.8

2.5

2.5

2.5

2.8

2.8

2.8

3.3

3.3

3.3

1.220

1.220

1.220

1.215

1.230

1.240

1.522

1.538

1.555

1.825

1.845

1.860

2

2.030

2

2.045

2

2.060

2.535

2.565

2.575

2.838

2.868

2.884

3

3.040

3

3.070

3

3.090

3.350

3.370

3.400

5

5.065

5

5.100

5

5.120

1.235

1.250

1.260

1
1
1
1
1
1
1
1
1
1

10
10
10
10
10
10
10
10
10
10

mV
mV
mV
mV
mV
mV
mV
mV
mV
mV

V
V
V

V
V
V

V
V
V

V
V
V

V
V
V

V
V
V

V
V
V

V
V
V

V
V
V

V
V
V

4

1761sfe

LT1761 Series

ELECTRICAL CHARACTERISTICS

The l denotes the specifi cations which apply over the full operating
temperature range, otherwise specifi cations are at T

PARAMETER CONDITIONS MIN TYP MAX UNITS

Load Regulation

Dropout Voltage
V

= V

IN

OUT(NOMINAL)

(Notes 5, 6, 11)

LT1761-1.2

LT1761-1.5

LT1761-1.8

LT1761-2

LT1761-2.5

LT1761-2.8

LT1761-3

LT1761-3.3

LT1761-5

LT1761 (Note 3)

= 1mA

I

LOAD

I

= 1mA

LOAD

I

= 10mA

LOAD

I

= 10mA

LOAD

I

= 50mA

LOAD

I

= 50mA

LOAD

I

= 100mA

LOAD

I

= 100mA

LOAD

= 25°C. (Note 2)

A

VIN = 2.3V, ΔI
V

= 2.3V, ΔI

IN

V

= 2.3V, ΔI

IN

V

= 2.3V, ΔI

IN

V

= 2.5V, ΔI

IN

V

= 2.5V, ΔI

IN

V

= 2.5V, ΔI

IN

V

= 2.5V, ΔI

IN

V

= 2.8V, ΔI

IN

V

= 2.8V, ΔI

IN

V

= 2.8V, ΔI

IN

V

= 2.8V, ΔI

IN

V

= 3V, ΔI

IN

V

= 3V, ΔI

IN

V

= 3V, ΔI

IN

V

= 3V, ΔI

IN

V

= 3.5V, ΔI

IN

V

= 3.5V, ΔI

IN

V

= 3.5V, ΔI

IN

V

= 3.5V, ΔI

IN

V

= 3.8V, ΔI

IN

V

= 3.8V, ΔI

IN

V

= 3.8V, ΔI

IN

V

= 3.8V, ΔI

IN

V

= 4V, ΔI

IN

V

= 4V, ΔI

IN

V

= 4V, ΔI

IN

V

= 4V, ΔI

IN

V

= 4.3V, ΔI

IN

V

= 4.3V, ΔI

IN

V

= 4.3V, ΔI

IN

V

= 4.3V, ΔI

IN

V

= 6V, ΔI

IN

V

= 6V, ΔI

IN

VIN = 6V, ΔI
V

= 6V, ΔI

IN

V

= 2.3V, ΔI

IN

VIN = 2.3V, ΔI
V

= 2.3V, ΔI

IN

V

= 2.3V, ΔI

IN

LOAD
LOAD
LOAD
LOAD

LOAD
LOAD
LOAD
LOAD

LOAD
LOAD
LOAD
LOAD

LOAD
LOAD
LOAD
LOAD

LOAD
LOAD
LOAD
LOAD

LOAD
LOAD
LOAD
LOAD

LOAD
LOAD
LOAD
LOAD

LOAD
LOAD
LOAD
LOAD

LOAD
LOAD
LOAD
LOAD

LOAD
LOAD
LOAD
LOAD

= 1mA to 50mA
= 1mA to 50mA
= 1mA to 100mA
= 1mA to 100mA

= 1mA to 50mA
= 1mA to 50mA
= 1mA to 100mA
= 1mA to 100mA

= 1mA to 50mA
= 1mA to 50mA
= 1mA to 100mA
= 1mA to 100mA

= 1mA to 50mA
= 1mA to 50mA
= 1mA to 100mA
= 1mA to 100mA

= 1mA to 50mA
= 1mA to 50mA
= 1mA to 100mA
= 1mA to 100mA

= 1mA to 50mA
= 1mA to 50mA
= 1mA to 100mA
= 1mA to 100mA

= 1mA to 50mA
= 1mA to 50mA
= 1mA to 100mA
= 1mA to 100mA

= 1mA to 50mA
= 1mA to 50mA
= 1mA to 100mA
= 1mA to 100mA

= 1mA to 50mA
= 1mA to 50mA
= 1mA to 100mA
= 1mA to 100mA

= 1mA to 50mA
= 1mA to 50mA
= 1mA to 100mA
= 1mA to 100mA

l

1

1

l

10

l

14

l

10

l

15

l

10

l

15

l

10

l

20

l

10

l

20

l

10

l

20

l

10

l

20

l

15

l

25

l

1

l

1

l

6
12
12
50

20
35
30
55

20
35
30
60

20
35
35
65

20
35
40
80

20
38
40
86

20
40
40
90

20
40
40

100

30
60
65

150

6
12
12
50

mV
mV
mV
mV

mV
mV
mV
mV

mV
mV
mV
mV

mV
mV
mV
mV

mV
mV
mV
mV

mV
mV
mV
mV

mV
mV
mV
mV

mV
mV
mV
mV

mV
mV
mV
mV

mV
mV
mV
mV

0.10 0.15

l

0.19

0.17 0.22

l

0.29

0.24 0.28

l

0.38

0.30 0.35

0.45

V
V

V
V

V
V

V
V

1761sfe

5

LT1761 Series

ELECTRICAL CHARACTERISTICS

The l denotes the specifi cations which apply over the full operating
temperature range, otherwise specifi cations are at T

PARAMETER CONDITIONS MIN TYP MAX UNITS

GND Pin Current
V

= V

IN

OUT(NOMINAL)

(Notes 5, 7)

Output Voltage Noise C
ADJ Pin Bias Current (Notes 3, 8) 30 100 nA
Shutdown Threshold V

SHDN Pin Current
(Note 9)

Quiescent Current in Shutdown VIN = 6V, V
Ripple Rejection (Note 3) V

Current Limit V

Input Reverse Leakage Current V
Reverse Output Current

(Note 10)

= 0mA

I

LOAD

I

= 1mA

LOAD

I

= 10mA

LOAD

I

= 50mA

LOAD

I

= 100mA

LOAD

= 10μF, C

OUT

= Off to On

OUT

V

= On to Off

OUT

= 0V

V

SHDN

V

= 20V

SHDN

SHDN

– V

IN

I

LOAD

IN

V

IN

IN

= 1.5V (Avg), V

OUT

= 50mA

= 7V, V

OUT

= V

OUT(NOMINAL)

= –20V, V

LT1761-1.2
LT1761-1.5
LT1761-1.8
LT1761-2
LT1761-2.5
LT1761-2.8
LT1761-3
LT1761-3.3
LT1761-5
LT1761 (Note 3)

= 25°C. (Note 2)

A

= 0.01μF, I

BYP

l
l
l
l
l

= 100mA, BW = 10Hz to 100kHz 20 μV

LOAD

l
l

0.25

l
l

20
55

230

1

2.2

0.8

0.65
0

1

45
100
400

2
4

2V

0.5
3

= 0V 0.01 0.1 μA

RIPPLE

= 0V

+ 1V or 2.3V (Note 12), ΔV

= 0V

OUT

V

= 1.2V, VIN < 1.2V

OUT

V

= 1.5V, VIN < 1.5V

OUT

V

= 1.8V, VIN < 1.8V

OUT

V

= 2V, VIN < 2V

OUT

V

= 2.5V, VIN < 2.5V

OUT

V

= 2.8V, VIN < 2.8V

OUT

V

= 3V, VIN < 3V

OUT

V

= 3.3V, VIN < 3.3V

OUT

V

= 5V, VIN < 5V

OUT

V

= 1.22V, VIN < 1.22V

OUT

= 0.5V

P-P

, f

RIPPLE

= 120Hz,

= –5%

OUT

55 65 dB

200 mA

l

110

l

10
10
10
10
10
10
10
10
10

5

1mA

20
20
20
20
20
20
20
20
20
10

μA
μA

μA
mA
mA

RMS

μA

μA

mA

μA

μA

μA

μA

μA

μA

μA

μA

μA

μA

V

Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.

Note 2: The LT1761 regulators are tested and specifi ed under pulse load
conditions such that T
at T

= 25°C. Performance at –40°C and 125°C is assured by design,

A

≈ TA. The LT1761E is 100% production tested

J

characterization and correlation with statistical process controls. The
LT1761I is guaranteed over the full –40°C to 125°C operating junction
temperature range. The LT1761MP is 100% tested and guaranteed over
the –55°C to 125°C operating junction temperature range.

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

Note 4: Operating conditions are limited by maximum junction
temperature. The regulated output voltage specifi cation 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 specifi ed 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 5μA DC load on the output.

Note 6: Dropout voltage is the minimum input to output voltage differential
needed to maintain regulation at a specifi ed output current. In dropout, the
output voltage will be equal to: V

Note 7: GND pin current is tested with V

IN

– V

DROPOUT

= V

IN

.

OUT(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 specifi cation. 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 fl ows into the ADJ pin.
Note 9: SHDN pin current fl ows 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 fl ows into the OUT
pin and out the GND pin.

Note 11: For the LT1761, LT1761-1.2, LT1761-1.5, LT1761-1.8 and
LT1761-2 dropout voltage will be limited by the minimum input voltage
specifi cation under some output voltage/load conditions. See the curve of
Minimum Input Voltage in the Typical Performance Characteristics.

Note 12: To satisfy requirements for minimum input voltage, current limit
is tested at V

= V

IN

OUT(NOMINAL)

+ 1V or VIN = 2.3V, whichever is greater.

1761sfe

6