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

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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