ANALOG DEVICES LT 1762 EMS8 Datasheet

FEATURES

LT1762 Series

150mA, Low Noise, LDO

Micropower Regulators

U

DESCRIPTIO

■

Low Noise: 20µV

■

Low Quiescent Current: 25µA

■

Wide Input Voltage Range: 1.8V to 20V

■

Output Current: 150mA

■

Very Low Shutdown Current: < 1µA

■

Low Dropout Voltage: 270mV

■

No Protection Diodes Needed

■

Fixed Output Voltages: 2.5V, 3V, 3.3V, 5V

■

Adjustable Output from 1.22V to 20V

■

Stable with 2.2µF Output Capacitor

■

Stable with Aluminum, Tantalum or

(10Hz to 100kHz)

RMS

Ceramic Capacitors

■

Reverse Battery Protection

■

No Reverse Current

■

Overcurrent and Overtemperature Protected

■

8-Lead MSOP Package

U

APPLICATIO S

■

Cellular Phones

■

Battery-Powered Systems

■

Frequency Synthesizers

■

Noise-Sensitive Instrumentation Systems

The LT

®

1762 series are micropower, low noise, low
dropout regulators. The devices are capable of supplying
150mA of output current with a dropout voltage of 270mV.
Designed for use in battery-powered systems, the low
25µA quiescent current makes them an ideal choice.
Quiescent current is well controlled; it does not rise in
dropout as it does with many other regulators.

A key feature of the LT1762 regulators is low output noise.
With the addition of an external 0.01µF bypass capacitor,
output noise drops to 20µV

over a 10Hz to 100kHz

RMS

bandwidth. The LT1762 regulators are stable with output
capacitors as low as 2.2µF. 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 parts come in fixed output volt­ages of 2.5V, 3V, 3.3V and 5V, and as an adjustable device
with a 1.22V reference voltage. The LT1762 regulators are
available in the 8-lead MSOP package.

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

All other trademarks are the property of their respective owners.

TYPICAL APPLICATIO

3.3V Low Noise Regulator

V

3.7V TO
20V

IN

1µF

IN

SHDN

OUT

SENSE

LT1762-3.3

BYP

GND

U

0.01µF

+

3.3V AT 150mA
20µV

RMS

10µF

NOISE

1762 TA01

Dropout Voltage

400

350

300

250

200

150

100

DROPOUT VOLTAGE (mV)

50

0

20

0

40

OUTPUT CURRENT (mA)

60

80 100 120 140

160

1762 TA02

1762fa

1

LT1762 Series

1
2
3
4

OUT

SENSE/ADJ*

BYP

GND

8
7
6
5

IN
NC
NC
SHDN

TOP VIEW

MS8 PACKAGE

8-LEAD PLASTIC MSOP

WW

W

ABSOLUTE MAXIMUM RATINGS

(Note 1)

IN Pin Voltage ........................................................ ± 20V

U

U

W

PACKAGE/ORDER INFORMATION

ORDER PART

NUMBER

OUT Pin Voltage .................................................... ±20V

Input to Output Differential Voltage ....................... ±20V

SENSE Pin Voltage ............................................... ±20V

ADJ Pin Voltage ...................................................... ±7V

BYP Pin Voltage.................................................... ± 0.6V

SHDN Pin Voltage ................................................. ± 20V

Output Short-Circut Duration.......................... Indefinite

Operating Junction Temperature Range

(Note 2) ............................................ –40°C to 125°C

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

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

Order Options Tape and Reel: Add #TR
Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF

Lead Free Part Marking: http://www.linear.com/leadfree/

*PIN 2: SENSE FOR LT1762-2.5/
LT1762-3/LT1762-3.3/LT1762-5

ADJ FOR LT1762

T

= 150°C, θJA = 125°C/ W

JMAX

SEE THE APPLICATIONS
INFORMATION SECTION.

Consult factory for Industrial and Military grade parts.

LT1762EMS8
LT1762EMS8-2.5
LT1762EMS8-3
LT1762EMS8-3.3
LT1762EMS8-5

MS8 PART MARKING

LTHF
LTHG
LTHH
LTHJ
LTHK

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 Operating Voltage I

Regulated Output Voltage LT1762-2.5 VIN = 3V, I
(Note 4) 3.5V < V

ADJ Pin Voltage LT1762 VIN = 2V, I
(Notes 3, 4) 2.22V < V

Line Regulation LT1762-2.5 ∆VIN = 3V to 20V, I

Load Regulation LT1762-2.5 VIN = 3.5V, ∆I

2

= 150mA

LOAD

= 1mA 2.475 2.5 2.525 V

LOAD

< 20V, 1mA < I

IN

LT1762-3 VIN = 3.5V, I

4V < V

IN

LT1762-3.3 VIN = 3.8V, I

4.3V < V

LT1762-5 VIN = 5.5V, I

6V < V

IN

LT1762-3 ∆V
LT1762-3.3 ∆V
LT1762-5 ∆V
LT1762 (Note 3) ∆V

V

IN

LT1762-3 VIN = 4V, ∆I

V

IN

LT1762-3.3 VIN = 4.3V, ∆I

V

IN

LT1762-5 VIN = 6V, ∆I

V

IN

LT1762 (Note 3) VIN = 2.22V, ∆I

V

IN

= 1mA 2.970 3 3.030 V

LOAD

< 20V, 1mA < I

= 1mA 3.267 3.3 3.333 V

LOAD

< 20V, 1mA < I

IN

= 1mA 4.950 5 5.050 V

LOAD

< 20V, 1mA < I

= 1mA 1.208 1.22 1.232 V

LOAD

< 20V, 1mA < I

IN

= 3.5V to 20V, I

IN

= 3.8V to 20V, I

IN

= 5.5V to 20V, I

IN

= 2V to 20V, I

IN

= 3.5V, ∆I

LOAD

= 4V, ∆I

LOAD

= 4.3V, ∆I

LOAD

= 6V, ∆I

LOAD

= 2.22V, ∆I

●

< 150mA

LOAD

< 150mA

LOAD

< 150mA

LOAD

< 150mA

LOAD

< 150mA

LOAD

= 1mA

LOAD

= 1mA

LOAD

= 1mA

LOAD

= 1mA

LOAD

= 1mA

LOAD

= 1mA to 150mA 4 12 mV

LOAD

= 1mA to 150mA

LOAD

= 1mA to 150mA 4 15 mV
= 1mA to 150mA

= 1mA to 150mA 5 17 mV

LOAD

= 1mA to 150mA

LOAD

= 1mA to 150mA 9 25 mV
= 1mA to 150mA

= 1mA to 150mA 1 6 mV

LOAD

= 1mA to 150mA

LOAD

●

2.435 2.5 2.565 V

●

2.925 3 3.075 V

●

3.220 3.3 3.380 V

●

4.875 5 5.125 V

●

1.190 1.22 1.250 V

●

●

●

●

●

●

●

●

●

●

1.8 2.3 V

15 mV
15 mV
15 mV
15 mV
15 mV

25 mV

30 mV

33 mV

50 mV

12 mV

U

1762fa

LT1762 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

Dropout Voltage I

= V

V

IN

OUT(NOMINAL)

(Notes 5, 6) I

GND Pin Current I

= V

V

IN

OUT(NOMINAL)

(Notes 5, 7) I

Output Voltage Noise C

ADJ Pin Bias Current (Notes 3, 8) 30 100 nA

Shutdown Threshold V

SHDN Pin Current V
(Note 9) V

Quiescent Current in Shutdown VIN = 6V, V

Ripple Rejection VIN – V

Current Limit VIN = 7V, V

Input Reverse Leakage Current VIN = – 20V, V

Reverse Output Current LT1762-2.5 V
(Note 10) LT1762-3 V

= 1mA 0.09 0.15 V

LOAD

I

= 1mA

LOAD

= 10mA 0.15 0.21 V

LOAD

I

= 10mA

LOAD

I

= 50mA 0.21 0.27 V

LOAD

I

= 50mA

LOAD

I

= 150mA 0.27 0.33 V

LOAD

= 150mA

I

LOAD

= 0mA

LOAD

I

= 1mA

LOAD

= 10mA

LOAD

= 50mA

I

LOAD

= 150mA

I

LOAD

= 10µF, C

OUT

= Off to On

OUT

= On to Off

V

OUT

= 0V 0.1 µA

SHDN

= 20V 1 µA

SHDN

OUT

= 150mA

I

LOAD

= V

V

IN

OUT(NOMINAL)

LT1762-3.3 V
LT1762-5 V
LT1762 (Note 3) V

= 0.01µF, I

BYP

= 0V 0.1 1 µA

SHDN

= 1V (Avg), V

= 0V 400 mA

OUT

RIPPLE

+ 1V, ∆V

= 0V

OUT

= 2.5V, VIN < 2.5V 10 20 µA

OUT

= 3V, VIN < 3V 10 20 µA

OUT

= 3.3V, VIN < 3.3V 10 20 µA

OUT

= 5V, VIN < 5V 10 20 µA

OUT

= 1.22V, VIN < 1.22V 5 10 µA

OUT

= 150mA, BW = 10Hz to 100kHz 20 µV

LOAD

= 0.5V

OUT

P-P

= – 0.1V

, f

= 120Hz, 50 65 dB

RIPPLE

●

●

●

●

●

●

●

●

●

●

●

0.25 0.65 V

●

160 mA

●

25 65 µA
70 120 µA

350 500 µA

1.3 1.8 mA
47 mA

0.8 2 V

0.19 V

0.25 V

0.31 V

0.40 V

1mA

RMS

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 LT1762 regulators are tested and specified under pulse load
conditions such that T

≈ TA. The LT1762 is 100% tested at 25°C.

J

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

Note 3: The LT1762 (adjustable version) is tested and specified 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 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 LT1762
(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 5µA 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: V

Note 7: GND pin current is tested with V

IN

– V

DROPOUT

= V

IN

.

OUT(NOMINAL)

and a current
source load. This means the device is tested while operating in its dropout
region. 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.

1762fa

3

LT1762 Series

TEMPERATURE (°C)

–50

OUTPUT VOLTAGE (V)

100

1762 G06

050

3.060

3.045

3.030

3.015

3.000

2.985

2.970

2.955

2.940
–25 25 75 125

IL = 1mA

TEMPERATURE (°C)

–50

ADJ PIN VOLTAGE (V)

100

1762 G09

050

1.240

1.235

1.230

1.225

1.220

1.215

1.210

1.205

1.200
–25 25 75 125

IL = 1mA

UW

TYPICAL PERFORMANCE CHARACTERISTICS

Typical Dropout Voltage

500

450

400

350

300

250

200

150

DROPOUT VOLTAGE (mV)

100

50

0

0204060 80 100

LOAD CURRENT (mA)

Quiescent Current

40

VIN = 6V

= ∞, IL = 0 (LT1762-2.5/-3/-3.3/-5)

R

35

L

= 250k, IL = 5µA (LT1762)

R

L

30

25

20

15

10

QUIESCENT CURRENT (µA)

5

0

–50

050

–25 25 75 125

TEMPERATURE (°C)

TJ = 125°C

TJ = 25°C

V

SHDN

= V

120

IN

140 160

1762 G01

100

1762 G04

Guaranteed Dropout Voltage Dropout Voltage

500

= TEST POINTS

450

400

350

300

250

200

150

DROPOUT VOLTAGE (mV)

100

50

0

0204060 80 100

LOAD CURRENT (mA)

LT1762-2.5
Output Voltage

2.54
IL = 1mA

2.53

2.52

2.51

2.50

2.49

OUTPUT VOLTAGE (V)

2.48

2.47

2.46

–50

050

–25 25 75 125

TEMPERATURE (°C)

TJ ≤ 125°C

TJ ≤ 25°C

120

140 160

1762 G02

100

1762 G05

500

450

400

350

300

250

200

150

DROPOUT VOLTAGE (mV)

100

50

0

–50

–25

LT1762-3
Output Voltage

IL = 150mA

IL = 50mA

IL = 10mA

IL = 1mA

50

25

0

TEMPERATURE (°C)

100

125

1762 G03

75

3.360

3.345

3.330

3.315

3.300

3.285

OUTPUT VOLTAGE (V)

3.270

3.255

3.240

4

LT1762-3.3
Output Voltage

IL = 1mA

050

–25 25 75 125

–50

TEMPERATURE (°C)

100

1762 G07

LT1762-5
Output Voltage

5.100
IL = 1mA

5.075

5.050

5.025

5.000

4.975

OUTPUT VOLTAGE (V)

4.950

4.925

4.900

–25 25 75 125

–50

050
TEMPERATURE (°C)

LT1762
ADJ Pin Voltage

100

1762 G08

1762fa

UW

TYPICAL PERFORMANCE CHARACTERISTICS

LT1762 Series

LT1762-2.5
Quiescent Current

400

TJ = 25°C

350

= ∞

R

L

300

250

200

150

100

QUIESCENT CURRENT (µA)

50

0

0

LT1762-5
Quiescent Current

400

TJ = 25°C

350

= ∞

R

L

300

250

200

150

100

QUIESCENT CURRENT (µA)

50

0

213579

0

V

= 0V

V

= V

SHDN

213579

4

INPUT VOLTAGE (V)

V

SHDN

4

INPUT VOLTAGE (V)

SHDN

IN

6

8

10

1762 G10

= V

IN

V

= 0V

SHDN

6

8

10

1762 G13

LT1762-3
Quiescent Current

400

TJ = 25°C

350

= ∞

R

L

300

250

200

150

100

QUIESCENT CURRENT (µA)

V

50

0

213579

0

= V

SHDN

IN

6

4

INPUT VOLTAGE (V)

LT1762
Quiescent Current

30

V

= V

SHDN

25

20

15

10

QUIESCENT CURRENT (µA)

5

0

02 6 10 14 18

4 8 12 16

IN

V

= 0V

SHDN

INPUT VOLTAGE (V)

V

SHDN

= 0V

8

TJ = 25°C

= 250k

R

L

1762 G14

1762 G11

LT1762-3.3
Quiescent Current

400

TJ = 25°C

350

= ∞

R

L

300

250

200

150

100

QUIESCENT CURRENT (µA)

V

= 0V

V

50

10

0

213579

0

= V

SHDN

4

INPUT VOLTAGE (V)

SHDN

IN

6

8

10

1762 G12

LT1762-2.5
GND Pin Current

800

700

600

500

400

300

GND PIN CURRENT (µA)

200

100

20

0

RL = 100Ω

= 25mA*

I

L

213579

0

INPUT VOLTAGE (V)

4

TJ = 25°C

= V

V

IN

*FOR V

RL = 250Ω

= 10mA*

I

L

RL = 2.5k
I

= 1mA*

L

6

SHDN

OUT

= 2.5V

8

10

1762 G15

LT1762-3
GND Pin Current

800

700

600

500

400

300

GND PIN CURRENT (µA)

200

100

0

0

TJ = 25°C

= V

V

IN

SHDN

RL = 120Ω

= 25mA*

I

L

213579

4

INPUT VOLTAGE (V)

*FOR V

RL = 300Ω

= 10mA*

I

L

RL = 3k

= 1mA*

I

L

6

OUT

8

= 3V

10

1762 G16

LT1762-3.3
GND Pin Current

800

700

600

500

400

300

GND PIN CURRENT (µA)

200

100

0

0

TJ = 25°C

= V

V

IN

SHDN

RL = 132Ω

= 25mA*

I

L

213579

INPUT VOLTAGE (V)

*FOR V

RL = 330Ω
I

RL = 3.3k

= 1mA*

I

L

6

4

= 10mA*

L

OUT

= 3.3V

8

10

1762 G17

LT1762-5
GND Pin Current

800

700

600

500

400

300

GND PIN CURRENT (µA)

200

100

0

0

RL = 200Ω

= 25mA*

I

L

TJ = 25°C

= V

V

IN

SHDN

*FOR V

RL = 5k

= 1mA*

I

L

213579

INPUT VOLTAGE (V)

6

4

= 5V

OUT

RL = 500Ω

= 10mA*

I

L

8

1762 G18

1762fa

10

5

LT1762 Series

INPUT VOLTAGE (V)

5.0

4.5

4.0

3.5

3.0

2.5

2.0

1.5

1.0

0.5

0

GND PIN CURRENT (mA)

1762 G21

0123

4

5

678910

TJ = 25°C
V

IN

= V

SHDN

*FOR V

OUT

= 3V

RL = 20Ω
I

L

= 150mA*

RL = 30Ω
I

L

= 100mA*

RL = 60Ω
I

L

= 50mA*

INPUT VOLTAGE (V)

5.0

4.5

4.0

3.5

3.0

2.5

2.0

1.5

1.0

0.5

0

GND PIN CURRENT (mA)

1762 G24

0123

4

5

678910

RL = 8.07Ω
I

L

= 150mA*

RL = 12.2Ω
I

L

= 100mA*

RL = 24.4Ω
I

L

= 50mA*

TJ = 25°C
V

IN

= V

SHDN

*FOR V

OUT

= 1.22V

UW

TYPICAL PERFORMANCE CHARACTERISTICS

LT1762
GND Pin Current

800

700

600

500

400

300

GND PIN CURRENT (µA)

200

100

0

RL = 48.8Ω

= 25mA*

I

L

213579

0

INPUT VOLTAGE (V)

LT1762-3.3
GND Pin Current

5.0

4.5

4.0

3.5

3.0

2.5

2.0

1.5

GND PIN CURRENT (mA)

1.0

0.5

0

0123

RL = 33Ω
I

INPUT VOLTAGE (V)

4

RL = 22Ω

= 150mA*

I

L

= 100mA*

L

RL = 66Ω

= 50mA*

I

L

4

TJ = 25°C

= V

V

IN

SHDN

*FOR V

RL = 122Ω
I

RL = 1.22k
I

5

= 1.22V

OUT

= 10mA*

L

= 1mA*

L

6

8

TJ = 25°C

= V

V

IN

SHDN

*FOR V

= 3.3V

OUT

678910

1762 G19

1762 G22

LT1762-2.5
GND Pin Current

5.0

4.5

4.0

3.5

3.0

2.5

2.0

1.5

GND PIN CURRENT (mA)

1.0

0.5

0

10

0123

RL = 16.7Ω
I

= 150mA*

L

RL = 25Ω

= 100mA*

I

L

RL = 50Ω

= 50mA*

I

L

INPUT VOLTAGE (V)

TJ = 25°C
V

IN

*FOR V

4

678910

5

= V

SHDN
OUT

= 2.5V

1762 G20

LT1762-5
GND Pin Current

5.0
TJ = 25°C

4.5

= V

V

IN

SHDN

*FOR V

= 5V

4.0

3.5

3.0

2.5

2.0

1.5

GND PIN CURRENT (mA)

1.0

0.5

0

OUT

0123

INPUT VOLTAGE (V)

RL = 33.3Ω
I

= 150mA*

L

RL = 50Ω

= 100mA*

I

L

RL = 100Ω

= 50mA*

I

L

4

678910

5

1762 G23

LT1762-3
GND Pin Current

LT1762
GND Pin Current

GND Pin Current vs I

5.0

4.5

4.0

3.5

3.0

2.5

2.0

1.5

GND PIN CURRENT (mA)

1.0

0.5

0

0204060 80 100

6

VIN = V

OUT(NOMINAL)

OUTPUT CURRENT (mA)

LOAD

+ 1V

120

140 160

1762 G25

SHDN Pin Threshold
(On-to-Off)

1.0
IL = 1mA

0.9

0.8

0.7

0.6

0.5

0.4

0.3

SHDN PIN THRESHOLD (V)

0.2

0.1

0

–50

–25

0

TEMPERATURE (°C)

SHDN Pin Threshold
(Off-to-On)

1.0

0.9

0.8

25

IL = 150mA

IL = 1mA

50

75

100

125

1762 G27

1762fa

0.7

0.6

0.5

0.4

0.3

SHDN PIN THRESHOLD (V)

0.2

0.1

0

50

25

75

100

125

1762 G26

–50

0

–25

TEMPERATURE (°C)

UW

FREQUENCY (Hz)

RIPPLE REJECTION (dB)

80

70

60

50

40

30

20

10

0

10 1k 10k 1M

1762 G36

100 100k

IL = 150mA
V

IN

= V

OUT(NOMINAL)

+

1V + 50mV

RMS

RIPPLE

C

OUT

= 10µF

C

BYP

= 0.01µF

C

BYP

= 100pF

C

BYP

= 1000pF

TYPICAL PERFORMANCE CHARACTERISTICS

LT1762 Series

SHDN Pin Input Current

1.4

1.2

1.0

0.8

0.6

0.4

SHDN PIN INPUT CURRENT (µA)

0.2

0

0123

SHDN PIN VOLTAGE (V)

4

678910

5

1762 G28

SHDN Pin Input Current ADJ Pin Bias Current

1.6

1.4

1.2

1.0

0.8

0.6

0.4

SHDN PIN INPUT CURRENT (mA)

0.2

0

–25 25 75 125

–50 100

050

TEMPERATURE (°C)

V

SHDN

= 20V

1762 G29

140

120

100

80

60

40

ADJ PIN BIAS CURRENT (nA)

20

0

–50

–25

0

TEMPERATURE (°C)

Current Limit Current Limit Reverse Output Current

500

V

= 0V

OUT

450

400

350

300

250

200

150

100

SHORT-CIRCUIT CURRENT (mA)

50

0

0

1

3

2

INPUT VOLTAGE (V)

4

5

6

7

1762 G31

500

450

400

350

300

250

200

150

100

SHORT-CIRCUIT CURRENT (mA)

50

0

–50 0

–25

25

TEMPERATURE (°C)

VIN = 7V

= 0V

V

OUT

50

75

100

125

1762 G32

100

TJ = 25°C, V

90

CURRENT FLOWS
INTO OUTPUT PIN

80

V

OUT

(LT1762-2.5/-3/-3.3/-5)

70

V

OUT

60

50

40

30

20

REVERSE OUTPUT CURRENT (µA)

10

0

0123

= 0V

IN

= V

SENSE

= V

(LT1762)

ADJ

LT1762-2.5

LT1762-3

OUTPUT VOLTAGE (V)

50

25

LT1762-5

4

678910

5

75

100

LT1762

LT1762-3.3

125

1762 G30

1762 G33

Reverse Output Current Input Ripple Rejection Input Ripple Rejection

30

VIN = 0V
V

= 1.22V (LT1762)

OUT

V

= 2.5V (LT1762-2.5)

25

OUT

V

= 3V (LT1762-3)

OUT

V

= 3.3V (LT1762-3.3)

OUT

V

= 5V (LT1762-5)

20

OUT

15

10

5

REVERSE OUTPUT CURRENT (µA)

0

–50

LT1762-2.5/-3/-3.3/-5

–25

LT1762

0

TEMPERATURE (°C)

80

70

60

50

C

= 10µF

40

30

IL = 150mA

RIPPLE REJECTION (dB)

20

= V

V

IN

OUT(NOMINAL)

1V + 50mV

10

C

BYP

0

50

25

75

100

125

1762 G34

10 1k 10k 1M

RIPPLE

RMS

= 0

100 100k

FREQUENCY (Hz)

OUT

C

= 2.2µF

OUT

+

1762 G35

1762fa

7

LT1762 Series

TEMPERATURE (°C)

–50

LOAD REGULATION (mV)

100

1762 G39

050–25 25 75 125

LT1762-2.5

5

0

–5

–10

–15

–20

–25

VIN = V

OUT(NOMINAL)

+ 1V

∆I

L

= 1mA TO 150mA

LT1762

LT1762-5

LT1762-3

LT1762-3.3

UW

TYPICAL PERFORMANCE CHARACTERISTICS

LT1762

Ripple Rejection Load Regulation

68

66

64

62

60

58

RIPPLE REJECTION (dB)

VIN = V

56

54

52

–50

OUT (NOMINAL)

1V + 0.5V

P-P

AT f = 120Hz

= 150mA

I

L

–25 25 75 125

+

RIPPLE

050

TEMPERATURE (°C)

100

1762 G37

Output Noise Spectral Density

= 0 Output Noise Spectral Density

C

BYP

10

C

= 10µF

OUT

= 150mA

I

L

LT1762-5

1

LT1762-2.5

LT1762

0.1

LT1762-3.3

LT1762-3

Minimum Input Voltage

2.50
V

= 1.22V

OUT

2.25

2.00

1.75

1.50

1.25

1.00

0.75

0.50

MINIMUM INPUT VOLTAGE (V)

0.25

0

–50

–25

IL = 150mA

25

0

TEMPERATURE (°C)

IL = 1mA

50

100

1762 G38

10

1

0.1

125

C

OUT

I

L

LT1762-5

LT1762

= 10µF

= 150mA

C

= 0.01µF

BYP

75

C

BYP

= 1000pF

C

BYP

= 100pF

8

OUTPUT NOISE SPECTRAL DENSITY (µV/√Hz)

0.01
10 1k 10k 100k

100

FREQUENCY (Hz)

RMS Output Noise vs
Bypass Capacitor

)

OUTPUT NOISE (µV

160

140

120

RMS

100

80

60

40

20

0

10

LT1762-5

LT1762

LT1762-2.5

100 1000 10000

LT1762-3.3

LT1762-3

C

(pF)

BYP

C
I

L

f = 10Hz TO 100kHz

= 10µF

OUT

= 150mA

1762 G40

1762 G42

OUTPUT NOISE SPECTRAL DENSITY (µV/√Hz)

0.01
10 1k 10k 100k

100

FREQUENCY (Hz)

RMS Output Noise vs
Load Current (10Hz to 100kHz)

160

C

= 10µF

OUT

C

= 0

0

0.01

BYP

= 0.01µF

C

BYP

0.1 1
LOAD CURRENT (mA)

LT1762-5

LT1762

LT1762-5

LT1762

10 100 1000

)

RMS

OUTPUT NOISE (µV

140

120

100

80

60

40

20

1762 G41

1762 G43

1762fa

UW

TYPICAL PERFORMANCE CHARACTERISTICS

LT1762 Series

V

OUT

100µV/DIV

V

OUT

100µV/DIV

LT1762-5
10Hz to 100kHz Output Noise
C

= 0

BYP

= 10µF

C

OUT

I

= 150mA 1762 G44

L

1ms/DIV

LT1762-5
10Hz to 100kHz Output Noise

= 1000pF

C

BYP

V

OUT

100µV/DIV

V

OUT

100µV/DIV

LT1762-5
10Hz to 100kHz Output Noise
C

= 100pF

BYP

C

= 10µF

OUT

= 150mA 1762 G45

I

L

1ms/DIV

LT1762-5
10Hz to 100kHz Output Noise

= 0.01µF

C

BYP

= 10µF

C

OUT

= 150mA 1762 G46

I

L

LT1762-5
Transient Response

= 0

C

BYP

0.3

0.2

0.1

0

–0.1

DEVIATION (V)

OUTPUT VOLTAGE

–0.2

–0.3

150

100

(mA)

50

LOAD CURRENT

0

0 400

1ms/DIV

800

1200 1600 2000

TIME (µs)

VIN = 6V

= 10µF

C

IN

= 10µF

C

OUT

1762 G48

C

OUT

= 150mA 1762 G47

I

L

LT1762-5
Transient Response
C

BYP

0.04

0.02

0

–0.02

DEVIATION (V)

OUTPUT VOLTAGE

–0.04

150

100

(mA)

50

LOAD CURRENT

0

040

= 10µF

= 0.01µF

1ms/DIV

80

120 160 200

TIME (µs)

VIN = 6V

= 10µF

C

IN

= 10µF

C

OUT

1762 G49

1762fa

9

LT1762 Series

UUU

PIN FUNCTIONS

OUT (Pin 1): Output. The output supplies power to the
load. A minimum output capacitor of 2.2µF is required to
prevent oscillations. Larger output capacitors will be
required for applications with large transient loads to limit
peak voltage transients. See the Applications Information
section for more information on output capacitance and
reverse output characteristics.

SENSE (Pin 2): Output Sense. For fixed voltage versions
of the LT1762 (LT1762-2.5/LT1762-3/LT1762-3.3/
LT1762-5), the SENSE pin is the input to the error ampli­fier. Optimum regulation will be obtained at the point
where the SENSE pin is connected to the OUT pin of the
regulator. In critical applications, small voltage drops are
caused by the resistance (R

) of PC traces between the

P

regulator and the load. These may be eliminated by con­necting the SENSE pin to the output at the load as shown
in Figure 1 (Kelvin Sense Connection). Note that the
voltage drop across the external PC traces will add to the
dropout voltage of the regulator. The SENSE pin bias
current is 10µA at the nominal rated output voltage. The
SENSE pin can be pulled below ground (as in a dual supply
system where the regulator load is returned to a negative
supply) and still allow the device to start and operate.

ADJ (Pin 2): Adjust. For the adjustable LT1762, this is the
input to the error amplifier. This pin is internally clamped
to ±7V. It has a bias current of 30nA which flows into the
pin (see curve of ADJ Pin Bias Current vs Temperature in
the Typical Performance Characteristics). The ADJ pin
voltage is 1.22V referenced to ground and the output
voltage range is 1.22V to 20V.

BYP (Pins 3): Bypass. The BYP pin is used to bypass the
reference of the LT1762 regulators to achieve low noise
performance from the regulator. The BYP pin is clamped
internally to ± 0.6V (one V

). A small capacitor from the

BE

output to this pin will bypass the reference to lower the
output voltage noise. A maximum value of 0.01µF can be
used for reducing output voltage noise to a typical 20µV

RMS

over a 10Hz to 100kHz bandwidth. If not used, this pin
must be left unconnected.

GND (Pin 4): Ground.

SHDN (Pin5): Shutdown. The SHDN pin is used to put the

LT1762 regulators into a low power shutdown state. The
output will be off when the SHDN pin is pulled low. The
SHDN pin can be driven either by 5V logic or open­collector logic with a pull-up resistor. The pull-up resistor
is required to supply the pull-up current of the open­collector gate, normally several microamperes, and the
SHDN pin current, typically 1µA. If unused, the SHDN pin
must be connected to V

. The device will be in low power

IN

shutdown state if the SHDN pin is not connected.

IN (Pin 8): Input. Power is supplied to the device through
the IN pin. A bypass capacitor is required on this pin if the
device is more than six inches away from the main input
filter capacitor. In general, the output impedance of a
battery rises with frequency, so it is advisable to include a
bypass capacitor in battery-powered circuits. A bypass
capacitor in the range of 1µF to 10µF is sufficient. The
LT1762 regulators are designed to withstand reverse
voltages on the IN pin with respect to ground and the OUT
pin. In the case of a reverse input, which can happen if a
battery is plugged in backwards, the device will act as if
there is a diode in series with its input. There will be no
reverse current flow into the regulator and no reverse
voltage will appear at the load. The device will protect both
itself and the load.

R

P

8

IN

LT1762

5

V

+

IN

Figure 1. Kelvin Sense Connection

SHDN

GND

OUT

SENSE

4

1

+

2

R

P

LOAD

1762 F01

10

1762fa

LT1762 Series

U

WUU

APPLICATIONS INFORMATION

The LT1762 series are 150mA low dropout regulators with
micropower quiescent current and shutdown. The devices
are capable of supplying 150mA at a dropout voltage of
270mV. Output voltage noise can be lowered to 20µV
over a 10Hz to 100kHz bandwidth with the addition of a

0.01µF reference bypass capacitor. Additionally, the refer-
ence bypass capacitor will improve transient response of
the regulator, lowering the settling time for transient load
conditions. The low operating quiescent current (25µA)
drops to less than 1µA in shutdown. In addition to the low
quiescent current, the LT1762 regulators incorporate sev­eral protection features which make them ideal for use in
battery-powered systems. The devices are protected
against both reverse input and reverse output voltages. In
battery backup applications where the output can be held
up by a backup battery when the input is pulled to ground,
the LT1762-X acts like it has a diode in series with its
output and prevents reverse current flow. Additionally, in
dual supply applications where the regulator load is re­turned to a negative supply, the output can be pulled below
ground by as much as 20V and still allow the device to start
and operate.

Adjustable Operation

The adjustable version of the LT1762 has an output
voltage range of 1.22V to 20V. The output voltage is set by
the ratio of two external resistors as shown in Figure 2. The
device servos the output to maintain the ADJ pin voltage

IN

V

IN

VV

OUT ADJ

VV

ADJ

InA

ADJ

OUTPUT RANGE = 1.22V TO 20V

Figure 2. Adjustable Operation

OUT

R

2

⎞

+

⎟
⎠

R

1

R2

R1

IR

()()

LT1762

ADJ

GND

⎛

=+

122 1

.

⎜
⎝

=

122

.

=°

30

AT 25 C

V

OUT

+

1762 F02

2

RMS

at 1.22V referenced to ground. The current in R1 is then
equal to 1.22V/R1 and the current in R2 is the current in R1
plus the ADJ pin bias current. The ADJ pin bias current,
30nA at 25°C, flows through R2 into the ADJ pin. The
output voltage can be calculated using the formula in
Figure 2. The value of R1 should be no greater than 250k
to minimize errors in the output voltage caused by the ADJ
pin bias current. Note that in shutdown the output is turned
off and the divider current will be zero. Curves of ADJ Pin
Voltage vs Temperature and ADJ Pin Bias Current vs
Temperature appear in the Typical Performance Charac­teristics section.

The adjustable device is tested and specified with the ADJ
pin tied to the OUT pin for an output voltage of 1.22V.
Specifications for output voltages greater than 1.22V will
be proportional to the ratio of the desired output voltage to

1.22V: V

/1.22V. For example, load regulation for an

OUT

output current change of 1mA to 150mA is –1mV typical
at V

= 1.22V. At V

OUT

= 12V, load regulation is:

OUT

(12V/1.22V)(–1mV) = –9.8mV

Bypass Capacitance and Low Noise Performance

The LT1762 regulators may be used with the addition of a
bypass capacitor from V

to the BYP pin to lower output

OUT

voltage noise. A good quality low leakage capacitor is
recommended. This capacitor will bypass the reference of
the regulator, providing a low frequency noise pole. The
noise pole provided by this bypass capacitor will lower the
output voltage noise to as low as 20µV

with the

RMS

addition of a 0.01µF bypass capacitor. Using a bypass
capacitor has the added benefit of improving transient
response. With no bypass capacitor and a 10µF output
capacitor, a 10mA to 150mA load step will settle to within
1% of its final value in less than 100µs. With the addition
of a 0.01µF bypass capacitor, the output will stay within
1% for a 10mA to 150mA load step (see LT1762-5
Transient Response in the Typical Performance Charac­teristics). However, regulator start-up time is proportional
to the size of the bypass capacitor, slowing to 15ms with
a 0.01µF bypass capacitor and 10µF output capacitor.

1762fa

11

LT1762 Series

U

WUU

APPLICATIONS INFORMATION

Output Capacitance and Transient Response

The LT1762 regulators are designed to be stable with a
wide range of output capacitors. The ESR of the output
capacitor affects stability, most notably with small capaci­tors. A minimum output capacitor of 2.2µF with an ESR of
3Ω or less is recommended to prevent oscillations. The
LT1762-X is a micropower device and output transient
response will be a function of output capacitance. Larger
values of output capacitance decrease the peak deviations
and provide improved transient response for larger load
current changes. Bypass capacitors, used to decouple
individual components powered by the LT1762-X, will
increase the effective output capacitor value. With larger
capacitors used to bypass the reference (for low noise
operation), larger values of output capacitors are needed.
For 100pF of bypass capacitance, 3.3µF of output capaci-
tor is recommended. With a 330pF bypass capacitor or
larger, a 4.7µF output capacitor is recommended. The
shaded region of Figure 3 defines the range over which the
LT1762 regulators are stable. The minimum ESR needed
is defined by the amount of bypass capacitance used,
while the maximum ESR is 3Ω.

Extra consideration must be given to the use of ceramic
capacitors. Ceramic capacitors are manufactured with a
variety of dielectrics, each with different behavior across
temperature and applied voltage. The most common di­electrics used are specified with EIA temperature charac­teristic codes of Z5U, Y5V, X5R and X7R. The Z5U and Y5V
dielectrics are good for providing high capacitances in a

4.0

3.5

3.0

2.5

2.0

ESR (Ω)

1.5

C

BYP

1.0

0.5

0

1

STABLE REGION

= 0
C

= 100pF

BYP

C

= 330pF

BYP

C

≥ 3300pF

BYP

310

245

OUTPUT CAPACITANCE (µF)

6

9

78

1762 F03

small package, but they tend to have strong voltage and
temperature coefficients as shown in Figures 4 and 5.
When used with a 5V regulator, a 16V 10µF Y5V capacitor
can exhibit an effective value as low as 1µF to 2µF for the
DC bias voltage applied and over the operating tempera­ture range. The X5R and X7R dielectrics result in more
stable characteristics and are more suitable for use as the
output capacitor. The X7R type has better stability across
temperature, while the X5R is less expensive and is
available in higher values. Care still must be exercised
when using X5R and X7R capacitors; the X5R and X7R
codes only specify operating temperature range and maxi­mum capacitance change over temperature. Capacitance
change due to DC bias with X5R and X7R capacitors is
better than Y5V and Z5U capacitors, but can still be

20

0

–20

–40

–60

CHANGE IN VALUE (%)

–80

–100

0

Figure 4. Ceramic Capacitor DC Bias Characteristics

40

20

0

–20

–40

–60

CHANGE IN VALUE (%)

–80

BOTH CAPACITORS ARE 16V,
1210 CASE SIZE, 10µF

–100

–50

–25 0

BOTH CAPACITORS ARE 16V,
1210 CASE SIZE, 10µF

X5R

Y5V

26

4

8

DC BIAS VOLTAGE (V)

50 100 125

25 75

TEMPERATURE (°C)

10

Y5V

14

12

16

1762 F04

X5R

1762 F05

12

Figure 3. Stability

Figure 5. Ceramic Capacitor Temperature Characteristics

1762fa

LT1762 Series

U

WUU

APPLICATIONS INFORMATION

significant enough to drop capacitor values below appro­priate levels. Capacitor DC bias characteristics tend to
improve as component case size increases, but expected
capacitance at operating voltage should be verified.

Voltage and temperature coefficients are not the only
sources of problems. Some ceramic capacitors have a
piezoelectric response. A piezoelectric device generates
voltage across its terminals due to mechanical stress,
similar to the way a piezoelectric accelerometer or micro­phone works. For a ceramic capacitor the stress can be
induced by vibrations in the system or thermal transients.
The resulting voltages produced can cause appreciable
amounts of noise, especially when a ceramic capacitor is
used for noise bypassing. A ceramic capacitor produced
Figure 6’s trace in response to light tapping from a pencil.

LT1762-5
C

= 10µF

OUT

= 0.01µf

C

BYP

= 100mA

I

LOAD

V

OUT

500µV/DIV

The GND pin current can be found by examining the GND
Pin Current curves in the Typical Performance Character­istics. Power dissipation will be equal to the sum of the two
components listed above.

The LT1762 series regulators have internal thermal limit­ing designed to protect the device during overload condi­tions. For continuous normal conditions, the maximum
junction temperature rating of 125°C must not be
exceeded. It is important to give careful consideration to
all sources of thermal resistance from junction to ambient.
Additional heat sources mounted nearby must also be
considered.

For surface mount devices, heat sinking is accomplished
by using the heat spreading capabilities of the PC board
and its copper traces. Copper board stiffeners and plated
through-holes can also be used to spread the heat gener­ated by power devices.

The following table lists thermal resistance for several
different board sizes and copper areas. All measurements
were taken in still air on 3/32" FR-4 board with one ounce
copper.

100ms/DIV

Figure 6. Noise Resulting from Tapping on a Ceramic Capacitor

1762 F05

Similar vibration induced behavior can masquerade as
increased output voltage noise.

Thermal Considerations

The power handling capability of the device will be limited
by the maximum rated junction temperature (125°C). The
power dissipated by the device will be made up of two
components:

1. Output current multiplied by the input/output voltage
differential: (I

)(VIN – V

OUT

OUT

), and

2. GND pin current multiplied by the input voltage:
(I

)(VIN).

GND

Table 1. Measured Thermal Resistance

COPPER AREA THERMAL RESISTANCE

TOPSIDE* BACKSIDE BOARD AREA (JUNCTION-TO-AMBIENT)

2500mm22500mm

1000mm22500mm

225mm22500mm

100mm22500mm

2

50mm

*Device is mounted on topside.

2500mm

2

2

2

2

2

2500mm

2500mm

2500mm

2500mm

2500mm

2

2

2

2

2

110°C/W

115°C/W

120°C/W

130°C/W

140°C/W

Calculating Junction Temperature

Example: Given an output voltage of 3.3V, an input voltage
range of 4V to 6V, an output current range of 0mA to 50mA
and a maximum ambient temperature of 50°C, what will
the maximum junction temperature be?

The power dissipated by the device will be equal to:

I

OUT(MAX)(VIN(MAX)

– V

OUT

) + I

GND(VIN(MAX)

)

1762fa

13

LT1762 Series

U

WUU

APPLICATIONS INFORMATION

where,

I

OUT(MAX)

V

IN(MAX)

I

GND

So,

P = 150mA(6V – 3.3V) + 5mA(6V) = 0.44W

The thermal resistance will be in the range of 110°C/W to
140°C/W depending on the copper area. So the junction
temperature rise above ambient will be approximately
equal to:

0.44W(125°C/W) = 55°C

The maximum junction temperature will then be equal to
the maximum junction temperature rise above ambient
plus the maximum ambient temperature or:

T

JMAX

Protection Features

The LT1762 regulators incorporate several protection
features which make them ideal for use in battery-powered
circuits. In addition to the normal protection features
associated with monolithic regulators, such as current
limiting and thermal limiting, the devices are protected
against reverse input voltages, reverse output voltages
and reverse voltages from output to input.

= 150mA

= 6V

at (I

= 150mA, VIN = 6V) = 5mA

OUT

= 50°C + 55°C = 105°C

20V. For fixed voltage versions, the output will act like a
large resistor, typically 500kΩ or higher, limiting current
flow to less than 100µA. For adjustable versions, the
output will act like an open circuit; no current will flow out
of the pin. If the input is powered by a voltage source, the
output will source the short-circuit current of the device
and will protect itself by thermal limiting. In this case,
grounding the SHDN pin will turn off the device and stop
the output from sourcing the short-circuit current.

The ADJ pin of the adjustable device can be pulled above
or below ground by as much as 7V without damaging the
device. If the input is left open circuit or grounded, the ADJ
pin will act like an open circuit when pulled below ground
and like a large resistor (typically 100k) in series with a
diode when pulled above ground.

In situations where the ADJ pin is connected to a resistor
divider that would pull the ADJ pin above its 7V clamp
voltage if the output is pulled high, the ADJ pin input
current must be limited to less than 5mA. For example, a
resistor divider is used to provide a regulated 1.5V output
from the 1.22V reference when the output is forced to 20V.
The top resistor of the resistor divider must be chosen to
limit the current into the ADJ pin to less than 5mA when the
ADJ pin is at 7V. The 13V difference between output and
ADJ pin divided by the 5mA maximum current into the ADJ
pin yields a minimum top resistor value of 2.6k.

Current limit protection and thermal overload protection
are intended to protect the device against current overload
conditions at the output of the device. For normal opera­tion, the junction temperature should not exceed 125°C.

The input of the device will withstand reverse voltages of
20V. Current flow into the device will be limited to less than
1mA (typically less than 100µA) and no negative voltage
will appear at the output. The device will protect both itself
and the load. This provides protection against batteries
which can be plugged in backward.

The output of the LT1762-X can be pulled below ground
without damaging the device. If the input is left open circuit
or grounded, the output can be pulled below ground by

14

In circuits where a backup battery is required, several
different input/output conditions can occur. The output
voltage may be held up while the input is either pulled to
ground, pulled to some intermediate voltage or is left open
circuit. Current flow back into the output will follow the
curve shown in Figure 7.

When the IN pin of the LT1762-X is forced below the OUT
pin or the OUT pin is pulled above the IN pin, input current
will typically drop to less than 2µA. This can happen if the
input of the device is connected to a discharged (low
voltage) battery and the output is held up by either a
backup battery or a second regulator circuit. The state of
the SHDN pin will have no effect on the reverse output
current when the output is pulled above the input.

1762fa

LT1762 Series

U

WUU

APPLICATIONS INFORMATION

100

TJ = 25°C

90

V
CURRENT FLOWS

80

INTO OUTPUT PIN

70

V
(LT1762-2.5/LT1762-3

60

LT1762-3.3/LT1762-5)
V

50

(LT1762)

40

30

20

REVERSE OUTPUT CURRENT (µA)

10

0

0123

Figure 7. Reverse Output Current

U

PACKAGE DESCRIPTION

= 0V

IN

= V

OUT

SENSE

= V

OUT

ADJ

LT1762-3

LT1762-3.3

4

678910

5

OUTPUT VOLTAGE (V)

MS8 Package

8-Lead Plastic MSOP

(LTC DWG # 05-08-1660)

LT1762

LT1762-2.5

LT1762-5

1762 F07

0.118 ± 0.004*
(3.00 ± 0.102)

0.193 ± 0.006

(4.90 ± 0.15)

0.040 ± 0.006

SEATING

PLANE

(1.02 ± 0.15)

0.012
(0.30)

REF

0.007

(0.18)

0.021 ± 0.006
(0.53 ± 0.015)

* DIMENSION DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS. MOLD FLASH,

PROTRUSIONS OR GATE BURRS SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE

** DIMENSION DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSIONS.

INTERLEAD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE

0° – 6° TYP

8

12

0.0256
(0.65)

BSC

7

6

5

0.118 ± 0.004**
(3.00 ± 0.102)

4

3

0.034 ± 0.004
(0.86 ± 0.102)

0.006 ± 0.004

(0.15 ± 0.102)

MSOP (MS8) 1098

Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen­tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.

1762fa

15

LT1762 Series

TYPICAL APPLICATION

+

SHDN

C1
10µF

V

> 3.7V

IN

U

Paralleling of Regulators for Higher Output Current

R1

0.1Ω

R2

0.1Ω

2.2k

R3

R4

2.2k

IN

SHDN

IN

SHDN

3

+

1/2 LT1490

2

–

LT1762-3.3

GND

LT1762

GND

8

4

OUT

BYP

OUT

BYP

ADJ

FB

C4

0.01µF

C5

0.01µF

R5

10k

1

+

R6
2k

R7

1.21k

C2
10µF

3.3V
300mA

1762 TA03

C3

0.01µF

RELATED PARTS

PART NUMBER DESCRIPTION COMMENTS

LT1120 125mA Low Dropout Regulator with 20µA I

Q

LT1121 150mA Micropower Low Dropout Regulator 30µA IQ, SOT-223 Package

LT1129 700mA Micropower Low Dropout Regulator 50µA Quiescent Current

LT1175 500mA Negative Low Dropout Micropower Regulator 45µA IQ, 0.26V Dropout Voltage, SOT-223 Package

LT1521 300mA Low Dropout Micropower Regulator with Shutdown 15µA IQ, Reverse Battery Protection

LT1529 3A Low Dropout Regulator with 50µA I

Q

LT1611 Inverting 1.4MHz Switching Regulator 5V to –5V at 150mA, Low Output Noise, SOT-23 Package

LT1613 1.4MHz Single-Cell Micropower DC/DC Converter SOT-23 Package, Internally Compensated

LTC1627 High Efficiency Synchronous Step-Down Switching Regulator Burst ModeTM Operation, Monolithic, 100% Duty Cycle

LT1761 Series 100mA, Low Noise, Low Dropout Micropower Regulators in SOT-23 20µA Quiescent Current, 20µV

LT1763 Series 500mA, Low Noise, LDO Micropower Regulators 30µA Quiescent Current, 20µV

Burst Mode is a trademark of Linear Technology Corporation.

Includes 2.5V Reference and Comparator

500mV Dropout Voltage

Noise

RMS

Noise

RMS

16

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

[phone] ● FAX: [phone]

●

www.linear-tech.com

1762fa

LT 1006 REV A • PRINTED IN USA

© LINEAR TECHNOLOGY CORPORATION 1999