ANALOG DEVICES LT 1962 EMS8 Datasheet

FEATURES

■

Low Noise: 20µV

■

Output Current: 300mA

■

Low Quiescent Current: 30µA

■

Wide Input Voltage Range: 1.8V to 20V

■

Low Dropout Voltage: 270mV

■

Very Low Shutdown Current: < 1µA

■

No Protection Diodes Needed

■

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

■

Adjustable Output from 1.22V to 20V

■

Stable with 3.3µF 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

■

Noise-Sensitive Instrumentation Systems

LT1962 Series

300mA, Low Noise,

Micropower

LDO Regulators

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DESCRIPTIO

The LT®1962 series are micropower, low noise, low
dropout regulators. The devices are capable of supplying
300mA of output current with a dropout voltage of 270mV.
Designed for use in battery-powered systems, the low
30µA 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 LT1962 regulators is low output noise.
With the addition of an external 0.01µF bypass capacitor,
output noise drops to 20µV
bandwidth. The LT1962 regulators are stable with output
capacitors as low as 3.3µF. 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

1.5V, 1.8V, 2.5V, 3V, 3.3V and 5V, and as an adjustable
device with a 1.22V reference voltage. The LT1962 regu­lators are available in the 8-lead MSOP package.

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

over a 10Hz to 100kHz

RMS

TYPICAL APPLICATIO

3.3V Low Noise Regulator

V

3.7V TO
20V

IN

1µF

IN

SHDN

OUT

SENSE

LT1962-3.3

BYP

GND

1962 TA01

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0.01µF

+

3.3V AT 300mA
20µV

RMS

10µF

NOISE

Dropout Voltage

400

350

300

250

200

150

100

DROPOUT VOLTAGE (mV)

50

0

0

100

LOAD CURRENT (mA)

150

200

250

30050

1962 TA02

1

LT1962 Series

WWWU

ABSOLUTE AXI U RATI GS

(Note 1)

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

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

Input to Output Differential Voltage (Note 2) ......... ±20V

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

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

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

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

Output Short-Circuit Duration......................... Indefinite

Operating Junction Temperature Range

(Note 3) ............................................ –40°C to 125°C

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

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

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W

PACKAGE/ORDER I FOR ATIO

ORDER PART

TOP VIEW

8

OUT

SENSE/ADJ*

*PIN 2: SENSE FOR LT1962-1.5/LT1962-1.8/
LT1962-2.5/LT1962-3/LT1962-3.3/LT1962-5.
ADJ FOR LT1962

Consult factory for parts specified with wider operating temperature ranges.

1
2

BYP

3

GND

4

MS8 PACKAGE

8-LEAD PLASTIC MSOP

T

= 150°C, θJA = 125°C/W

JMAX

SEE THE APPLICATIONS
INFORMATION SECTION

FOR ADDITIONAL

INFORMATION ON

THERMAL RESISTANCE

7
6
5

IN
NC
NC
SHDN

NUMBER

LT1962EMS8
LT1962EMS8-1.5
LT1962EMS8-1.8
LT1962EMS8-2.5
LT1962EMS8-3
LT1962EMS8-3.3
LT1962EMS8-5

MS8 PART MARKING

LTML
LTSZ
LTTA

LTPQ
LTPS
LTPR

LTPT

ELECTRICAL CHARACTERISTICS

The ● denotes specifications which apply over the full operating temperature range, otherwise specifications are TA = 25°C. (Note 3)

PARAMETER CONDITIONS MIN TYP MAX UNITS

Minimum Operating Voltage (LT1962) I
Regulated Output Voltage LT1962-1.5 VIN = 2V, I

(Notes 4, 5) 2.5V < V

LT1962-1.8 VIN = 2.3V, I

LT1962-2.5 VIN = 3V, I

LT1962-3 VIN = 3.5V, I

LT1962-3.3 VIN = 3.8V, I

LT1962-5 VIN = 5.5V, I

ADJ Pin Voltage LT1962 VIN = 2V, I
(Notes 4, 5) 2.3V < V

Line Regulation LT1962-1.5 ∆VIN = 2V to 20V, I

LT1962-1.8 ∆V
LT1962-2.5 ∆V
LT1962-3 ∆V
LT1962-3.3 ∆V
LT1962-5 ∆V
LT1962 (Note 4) ∆V

Load Regulation LT1962-1.5 VIN = 2.5V, ∆I

LT1962-1.8 VIN = 2.8V, ∆I

= 300mA (Notes 4, 12) ● 1.8 2.3 V

LOAD

= 1mA 1.485 1.500 1.515 V

LOAD

IN

2.8V < V

IN

3.5V < V

IN

< 20V, 1mA < I

4V < V

IN

4.3V < V

IN

< 20V, 1mA < I

6V < V

IN

IN

= 2.3V to 20V, I

IN

= 3V to 20V, 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

= 2.5V, ∆I

V

IN

= 2.8V, ∆I

V

IN

< 20V, 1mA < I

= 1mA 1.782 1.800 1.818 V

LOAD

< 20V, 1mA < I

= 1mA 2.475 2.500 2.525 V

LOAD

< 20V, 1mA < I

= 1mA 2.970 3.000 3.030 V

LOAD

= 1mA 3.267 3.300 3.333 V

LOAD

< 20V, 1mA < I

= 1mA 4.950 5.000 5.050 V

LOAD

= 1mA 1.208 1.220 1.232 V

LOAD

< 20V, 1mA < I

LOAD

LOAD

LOAD

LOAD
LOAD
LOAD

LOAD

= 1mA to 300mA 3 8 mV

LOAD

= 1mA to 300mA ● 15 mV

LOAD

= 1mA to 300mA 4 9 mV

LOAD

= 1mA to 300mA ● 18 mV

LOAD

< 300mA ● 1.462 1.500 1.538 V

LOAD

< 300mA ● 1.755 1.800 1.845 V

LOAD

< 300mA ● 2.435 2.500 2.565 V

LOAD

< 300mA ● 2.925 3.000 3.075 V

LOAD

< 300mA ● 3.220 3.300 3.380 V

LOAD

< 300mA ● 4.875 5.000 5.125 V

LOAD

< 300mA ● 1.190 1.220 1.250 V

LOAD

= 1mA ● 15 mV

= 1mA ● 15 mV

= 1mA ● 15 mV

= 1mA ● 15 mV
= 1mA ● 15 mV
= 1mA ● 15 mV

= 1mA ● 15 mV

2

LT1962 Series

ELECTRICAL CHARACTERISTICS

The ● denotes specifications which apply over the full operating temperature range, otherwise specifications are TA = 25°C. (Note 3)

PARAMETER CONDITIONS MIN TYP MAX UNITS

Load Regulation LT1962-2.5 VIN = 3.5V, ∆I

= 3.5V, ∆I

V

IN

LT1962-3 VIN = 4V, ∆I

= 4V, ∆I

V

IN

LT1962-3.3 VIN = 4.3V, ∆I

V

= 4.3V, ∆I

IN

LT1962-5 VIN = 6V, ∆I

V

= 6V, ∆I

IN

LT1962 (Note 4) VIN = 2.3V, ∆I

= 2.3V, ∆I

V

IN

Dropout Voltage I

= V

V

IN

OUT(NOMINAL)

(Notes 6, 7, 12)

GND Pin Current I

= V

V

IN

OUT(NOMINAL)

(Notes 6, 8)

Output Voltage Noise C

= 10mA 0.10 0.15 V

LOAD

I

= 10mA ● 0.21 V

LOAD

I

= 50mA 0.15 0.20 V

LOAD

I

= 50mA ● 0.28 V

LOAD

I

= 100mA 0.18 0.24 V

LOAD

I

= 100mA ● 0.33 V

LOAD

I

= 300mA 0.27 0.33 V

LOAD

= 300mA ● 0.43 V

I

LOAD

= 0mA ● 30 75 µA

LOAD

I

= 1mA ● 65 120 µA

LOAD

I

= 50mA ● 1.1 1.6 mA

LOAD

= 100mA ● 23 mA

I

LOAD

= 300mA ● 812 mA

I

LOAD

= 10µF, C

OUT

= 0.01µF, I

BYP

ADJ Pin Bias Current (Notes 4, 9) 30 100 nA
Shutdown Threshold V

SHDN Pin Current V
(Note 10) 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 LT1962-1.5 V

(Note 11) LT1962-1.8 V

= Off to On ● 0.8 2 V

OUT

= On to Off ● 0.25 0.65 V

V

OUT

= 0V 0.01 0.5 µA

SHDN

= 20V 1 5 µA

SHDN

= 0V 0.1 1 µA

SHDN

= 1.5V (Avg), V

OUT

= 300mA

I

LOAD

= 0V 700 mA

OUT

= V

V

IN

OUT(NOMINAL)

= 0V ● 1mA

OUT

LT1962-2.5 V
LT1962-3 V
LT1962-3.3 V
LT1962-5 V
LT1962 (Note 4) V

RIPPLE

+ 1V, ∆V

= 1.5V, VIN < 1.5V 10 20 µA

OUT

= 1.8V, VIN < 1.8V 10 20 µA

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

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

Note 2: Absolute maximum input to output differential voltage cannot be
achieved with all combinations of rated IN pin and OUT pin voltages. With
the IN pin at 20V, the OUT pin may not be pulled below 0V. The total
measured voltage from in to out can not exceed ±20V.

= 1mA to 300mA 5 12 mV

LOAD

= 1mA to 300mA ● 25 mV

LOAD

= 1mA to 300mA 7 15 mV

LOAD

= 1mA to 300mA ● 30 mV

LOAD

= 1mA to 300mA 7 17 mV

LOAD

= 1mA to 300mA ● 33 mV

LOAD

= 1mA to 300mA 12 25 mV

LOAD

= 1mA to 300mA ● 50 mV

LOAD

= 1mA to 300mA 2 6 mV

LOAD

= 1mA to 300mA ● 12 mV

LOAD

= 300mA, BW = 10Hz to 100kHz 20 µV

LOAD

= 0.5V

= –0.1V ● 320 mA

OUT

P-P

, f

= 120Hz, 55 65 dB

RIPPLE

Note 3: The LT1962 regulators are tested and specified under pulse load
conditions such that T

≈ TA. The LT1962 is 100% tested at TA = 25°C.

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

Note 4: The LT1962 (adjustable version) is tested and specified for these
conditions with the ADJ pin connected to the OUT pin.

RMS

3

LT1962 Series

TEMPERATURE (°C)

–50

DROPOUT VOTLAGE (mV)

350

25

1962 G03

200

100

–25 0 50

50

0

400

300

250

150

75 100 125

IL = 300mA

IL = 100mA

IL = 50mA

IL = 10mA

IL = 1mA

ELECTRICAL CHARACTERISTICS

Note 5: 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 6: To satisfy requirements for minimum input voltage, the LT1962
(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 7: 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

IN

– V

Note 8: GND pin current is tested with VIN = V

DROPOUT

.

OUT(NOMINAL)

or VIN = 2.3V

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 9: ADJ pin bias current flows into the ADJ pin.
Note 10: SHDN pin current flows into the SHDN pin. This current is

included in the specification for GND pin current.
Note 11: 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 12: For the LT1962, LT1962-1.5 and LT1962-1.8 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. For other fixed voltage versions of
the LT1962, the minimum input voltage is limited by the dropout voltage.

(whichever is greater) and a current source load. This means the device is

UW

TYPICAL PERFOR A CE CHARACTERISTICS

Typical Dropout Voltage Guaranteed Dropout Voltage Dropout Voltage

400

350

300

250

200

150

100

DROPOUT VOLTAGE (mV)

50

0

50 100 200

0

OUTPUT CURRENT (mA)

TJ = 125°C

TJ = 25°C

150

250

300

1962 G01

500

= TEST POINTS

450
400
350
300
250
200
150

100

50

GUARANTEED DROPOUT VOLTAGE (mV)

0

0

50

100

OUTPUT CURRENT (mA)

TJ ≤ 125°C

≤ 25°C

T

J

150 200

250

300

1962 G02

Quiescent Current

50
45
40
35
30
25
20
15

VIN = 6V
V

QUIESCENT CURRENT (µA)

SHDN

10

RL = ∞, IL = 0 (LT1962-1.5/-1.8
/2.5/-3/-3.3/-5)

5

R

L

0

–50

4

= V

IN

= 250k, IL = 5µA (LT1962)

50

25

0

–25

TEMPERATURE (°C)

LT1962-1.5 Output Voltage

1.532
IL = 1mA

1.524

1.516

1.508

1.500

1.492

OUTPUT VOLTAGE (V)

1.484

1.476

100

125

1962 G04

75

1.468

–50

–25

0

TEMPERATURE (°C)

50

25

75

100

125

1962 G05

LT1962-1.8 Output Voltage

1.836
IL = 1mA

1.827

1.818

1.809

1.800

1.791

OUTPUT VOLTAGE (V)

1.782

1.773

1.764

–50

–25

0

25

TEMPERATURE (°C)

50

75

100

125

1962 G06

UW

TEMPERATURE (°C)

–50

OUTPUT VOTLAGE (V)

3.345

25

1962 G09

3.300

3.270

–25 0 50

3.255

3.240

3.360

3.330

3.315

3.285

75 100 125

IL = 1mA

TYPICAL PERFOR A CE CHARACTERISTICS

LT1962 Series

LT1962-2.5 Output Voltage

2.54
IL = 1mA

2.53

2.52

2.51

2.50

2.49

OUTPUT VOTLAGE (V)

2.48

2.47

2.46

–25 0 50

–50

25

TEMPERATURE (°C)

75 100 125

1962 G07

LT1962-3 Output Voltage

3.060
IL = 1mA

3.045

3.030

3.015

3.000

2.985

OUTPUT VOTLAGE (V)

2.970

2.955

2.940

–25 0 50

–50

TEMPERATURE (°C)

LT1962-5 Output Voltage LT1962 ADJ Pin Voltage

5.100
IL = 1mA

5.075

5.050

5.025

5.000

4.975

OUTPUT VOTLAGE (V)

4.950

4.925

4.900

–25 0 50

–50

25

TEMPERATURE (°C)

75 100 125

1962 G10

1.240
IL = 1mA

1.235

1.230

1.225

1.220

1.215

ADJ PIN VOTLAGE (V)

1.210

1.205

1.200

–25 0 50

–50

TEMPERATURE (°C)

LT1962-3.3 Output Voltage

25

75 100 125

1962 G08

LT1962-1.5 Quiescent Current

800

700

600

500

400

300

200

QUIESCENT CURRENT (µA)

100

25

75 100 125

1962 G11

0

0

V

= V

SHDN

246 107135 9

INPUT VOLTAGE (V)

TJ = 25°C

=

∞

R

L

V

= 0V

SHDN

IN

8

1962 G12

800

700

600

500

400

300

200

QUIESCENT CURRENT (µA)

100

0

V

= V

SHDN

IN

246 107135 9

0

INPUT VOLTAGE (V)

V

SHDN

TJ = 25°C

=

∞

R

L

= 0V

8

1962 G13

LT1962-2.5 Quiescent CurrentLT1962-1.8 Quiescent Current

800

700

600

500

400

300

200

QUIESCENT CURRENT (µA)

100

0

0

V

= V

SHDN

246 107135 9

INPUT VOLTAGE (V)

TJ = 25°C

=

∞

R

L

V

= 0V

SHDN

IN

8

1962 G14

LT1962-3 Quiescent Current

800

700

600

500

400

300

200

QUIESCENT CURRENT (µA)

100

0

0

V

= V

SHDN

246 107135 9

INPUT VOLTAGE (V)

TJ = 25°C

=

∞

R

L

V

= 0V

SHDN

IN

8

1962 G15

5