LINEAR TECHNOLOGY LT3020, LT3020-1.2, LT3020-1.5, LT3020-1.8 Technical data

查询LT3014HVES5供应商

FEATURES

■

VIN Range: 0.9V to 10V

■

Minimum Input Voltage: 0.9V

■

Dropout Voltage: 150mV Typical

■

Output Current: 100mA

■

Adjustable Output (V

■

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

■

Stable with Low ESR, Ceramic Output Capacitors

REF

= V

OUT(MIN)

= 200mV)

(2.2µF Minimum)

■

0.2% Load Regulation from 1mA to 100mA

■

Quiescent Current: 120µA (Typ)

■

3µA Typical Quiescent Current in Shutdown

■

Current Limit Protection

■

Reverse-Battery Protection

■

No Reverse Current

■

Thermal Limiting with Hysteresis

■

8-Lead DFN (3mm × 3mm) and MSOP Packages

U

APPLICATIO S

■

Low Current Regulators

■

Battery-Powered Systems

■

Cellular Phones

■

Pagers

■

Wireless Modems

LT3020/LT3020-1.2/

LT3020-1.5/LT3020-1.8

100mA, Low Voltage,

Very Low Dropout

Linear Regulator

U

DESCRIPTIO

The LT®3020 is a very low dropout voltage (VLDOTM) linear
regulator that operates from input supplies down to 0.9V.
This device supplies 100mA of output current with a
typical dropout voltage of 150mV. The LT3020 is ideal for
low input voltage to low output voltage applications,
providing comparable electrical efficiency to that of a
switching regulator.

The LT3020 regulator optimizes stability and transient
response with low ESR, ceramic output capacitors as
small as 2.2µF. Other LT3020 features include 0% typical
line regulation and 0.2% typical load regulation. In shut­down, quiescent current drops to 3µA.

Internal protection circuitry includes reverse-battery pro­tection, current limiting, thermal limiting with hysteresis,
and reverse-current protection. The LT3020 is available as
an adjustable output device with an output range down to
the 200mV reference. Three fixed output voltages, 1.2V,

1.5V and 1.8V, are also available.

The LT3020 regulator is available in the low profile
(0.75mm) 8-lead (3mm × 3mm) DFN package with Ex­posed Pad and the 8-lead MSOP package.

, LTC and LT are registered trademarks of Linear Technology Corporation.
VLDO is a trademark of Linear Technology Corporation.
All other trademarks are the property of their respective owners.

TYPICAL APPLICATIO

1.8V to 1.5V, 100mA VLDO Regulator

V

1.8V

IN

2.2µF

IN

LT3020-1.5

SHDN

OUT

GND

U

3020 TA01

2.2µF

V

OUT

1.5V
100mA

Minimum Input Voltage

1.1
IL = 100mA

1.0

0.9

0.8

0.7

0.6

0.5

0.4

0.3

MINIMUM INPUT VOLTAGE (V)

0.2

0.1

0

–50

250–25 50 75

TEMPERATURE (°C)

125100

3020 TA02

3020fc

1

LT3020/LT3020-1.2/

TOP VIEW

9

DD PACKAGE

8-LEAD (3mm × 3mm) PLASTIC DFN

5

6

7

8

4

3

2

1OUT

OUT

ADJ

GND

IN

IN

NC

SHDN

TOP VIEW

9

DD PACKAGE

8-LEAD (3mm × 3mm) PLASTIC DFN

5

6

7

8

4

3

2

1OUT

OUT

OUT

GND

IN

IN

NC

SHDN

LT3020-1.5/LT3020-1.8

WWWU

ABSOLUTE AXI U RATI GS

(Note 1)

IN Pin Voltage ........................................................ ± 10V

OUT Pin Voltage .................................................... ±10V

Input-to-Output Differential Voltage....................... ± 10V

ADJ Pin Voltage .................................................... ±10V

SHDN Pin Voltage ................................................. ± 10V

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

UU

W

PACKAGE/ORDER I FOR ATIO

ORDER PART NUMBER

LT3020EDD
LT3020IDD

DD PART MARKING

LAEX

T

= 125°C, θJA = 35°C/ W*, θJC = 3°C/ W

JMAX

EXPOSED PAD IS GND (PIN 9) CONNECT TO PIN 4
*SEE THE APPLICATIONS INFORMATION SECTION

LBYH

Operating Junction Temperature Range

(Notes 2, 3) .......................................... –40°C to 125°C

Storage Temperature Range

DD .................................................... – 65°C to 125°C

MS8.................................................. – 65°C to 150°C

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

ORDER PART NUMBER

LT3020EDD-1.2
LT3020EDD-1.5
LT3020EDD-1.8
LT3020IDD-1.2
LT3020IDD-1.5
LT3020IDD-1.8

DD PART MARKING

T

= 125°C, θJA = 35°C/ W*, θJC = 3°C/ W

JMAX

EXPOSED PAD IS GND (PIN 9) CONNECT TO PIN 4
*SEE THE APPLICATIONS INFORMATION SECTION

LBKC
LBKD
LBKF
LBYJ
LBYK
LBYM

ORDER PART NUMBER ORDER PART NUMBER

LT3020EMS8
LT3020IMS8

TOP VIEW

IN

OUT

1

OUT

2

ADJ

3

GND

4

MS8 PACKAGE

8-LEAD PLASTIC MSOP

T

= 150°C, θJA = 125°C/ W, θJC = 40°C/ W

JMAX

SEE THE APPLICATIONS INFORMATION SECTION

8
7
6
5

IN
NC
SHDN

MS8 PART MARKING

LTAGL
LTBYN

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/

Consult LTC Marketing for parts specified with wider operating temperature ranges.

TOP VIEW

IN

OUT

1

OUT

2

OUT

3

GND

4

MS8 PACKAGE

8-LEAD PLASTIC MSOP

T

= 150°C, θJA = 125°C/ W, θJC = 40°C/ W

JMAX

SEE THE APPLICATIONS INFORMATION SECTION

8
7
6
5

IN
NC
SHDN

LT3020EMS8-1.2
LT3020EMS8-1.5
LT3020EMS8-1.8
LT3020IMS8-1.2
LT3020IMS8-1.5
LT3020IMS8-1.8

MS8 PART MARKING

LTBKG
LTBKH
LTBKJ
LTBYP
LTBYQ
LTBYR

3020fc

2

LT3020/LT3020-1.2/

LT3020-1.5/LT3020-1.8

ELECTRICAL CHARACTERISTICS

The ● denotes specifications which apply over the full operating temperature range, otherwise specifications are TJ = 25°C.

PARAMETER CONDITIONS MIN TYP MAX UNITS

Minimum Input Voltage (Note 14) I

ADJ Pin Voltage (Notes 4, 5) V

Regulated Output Voltage LT3020-1.2 V
(Note 4) 1.5V < V

Line Regulation (Note 6) ∆V

Load Regulation (Note 6) V

Dropout Voltage (Notes 7, 12) I

GND Pin Current I

= V

V

IN

OUT(NOMINAL)

(Notes 8, 12) I

Output Voltage Noise C

ADJ Pin Bias Current V
Shutdown Threshold V

SHDN Pin Current (Note 10) V

Quiescent Current in Shutdown V
Ripple Rejection (Note 6) VIN – V

= 100mA, TJ > 0°C 0.9 1.05 V

LOAD

= 100mA, TJ < 0°C 0.9 1.10 V

I

LOAD

= 1.5V, I

IN

1.15V < V

LT3020-1.5 V

LT3020-1.8 V

= 1.15V to 10V, I

IN

LT3020-1.2 ∆V
LT3020-1.5 ∆V
LT3020-1.8 ∆V

= 1.15V, ∆I

IN

LT3020-1.2 V

LT3020-1.5 V

LT3020-1.8 V

= 10mA 85 115 mV

LOAD

I

= 10mA

LOAD

I

= 100mA 150 180 mV

LOAD

= 100mA

I

LOAD

= 0mA

LOAD

I

= 1mA 570 µA

LOAD

= 10mA 920 µA

LOAD

= 100mA

I

LOAD

= 2.2µF, I

OUT

= 0.2V,

ADJ

= Off to On

OUT

= On to Off

V

OUT

= 0V, V

SHDN

= 10V, V

V

SHDN

= 6V, V

IN

OUT

LT3020-1.2 VIN – V

= 100mA

I

LOAD

LT3020-1.5 VIN – V
I

= 100mA

LOAD

LT3020-1.8 VIN – V

= 100mA

I

LOAD

= 1mA 196 200 204 mV

LOAD

< 10V, 1mA < I

IN

= 1.5V, I

IN

= 1.8V, I

IN

1.8V < V

= 2.1V, I

IN

2.1V < V

LOAD
IN
IN
IN

= 1mA to 100mA –1 0.4 1 mV

LOAD

= 1.5V, ∆I

IN

= 1.8V, ∆I

IN

= 2.1V, ∆I

IN

= 100mA, BW = 10Hz to 100kHz, V

LOAD

= 1.2V (Notes 6, 9) 20 50 nA

RIPPLE

= 10V

IN

= 10V

IN

= 0V 3 9 µA

SHDN

= 1V, V

RIPPLE

= 1V, V

OUT

= 1V, V

OUT

= 1V, V

OUT

< 100mA

LOAD

= 1mA 1.176 1.200 1.224 V

LOAD

< 10V, 1mA < I

IN

= 1mA 1.470 1.500 1.530 V

LOAD

< 10V, 1mA < I

IN

= 1mA 1.764 1.800 1.836 V

LOAD

< 10V, 1mA < I

IN

= 1mA
= 1.5V to 10V, I
= 1.8V to 10V, I
= 2.1V to 10V, I

= 1mA to 100mA –6 1 6 mV

LOAD

= 1mA to 100mA –7.5 1.5 7.5 mV

LOAD

= 1mA to 100mA –9 2 9 mV

LOAD

= 0.5V

, f

P-P

RIPPLE

RIPPLE

RIPPLE

RIPPLE

= 0.5V

= 0.5V

= 0.5V

LOAD
LOAD
LOAD

= 120Hz, I

LOAD

LOAD

LOAD

= 1mA
= 1mA
= 1mA

, f

P-P

, f

P-P

, f

P-P

●

193 200 206 mV

< 100mA

< 100mA

< 100mA

= 1.2V 245 µV

OUT

= 100mA 64 dB

LOAD

= 120Hz, 60 dB

RIPPLE

= 120Hz, 58 dB

RIPPLE

= 120Hz, 56 dB

RIPPLE

●

1.157 1.200 1.236 V

●

1.447 1.500 1.545 V

●

1.737 1.800 1.854 V

●

–1.75 0 1.75 mV

●

–10.5 0 10.5 mV

●

–13 0 13 mV

●

–15.8 0 15.8 mV

●

●

●

●

●

●

0.25 0.61 V

●

●

120 250 µA

2.25 3.5 mA

0.61 0.9 V

3 9.5 µA

180 mV

285 mV

±1 µA

RMS

3020fc

3

LT3020/LT3020-1.2/
LT3020-1.5/LT3020-1.8

ELECTRICAL CHARACTERISTICS

The ● denotes specifications which apply over the full operating temperature range, otherwise specifications are TJ = 25°C.

PARAMETER CONDITIONS MIN TYP MAX UNITS

Current Limit (Note 12) V

Input Reverse Leakage Current V
Reverse Output Current V

(Notes 11, 13) LT3020-1.2 V

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

Note 2: The LT3020 regulators are tested and specified under pulse load
conditions such that T
T

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

A

≈ TA. The LT3020E is 100% production tested at

J

characterization and correlation with statistical process controls. The
LT3020I is guaranteed over the full –40°C to 125°C operating junction
temperature range.

Note 3: This IC includes overtemperature protection that is intended to
protect the device during momentary overload conditions. Junction
temperature will exceed 125°C when overtemperature protection is active.
Continuous operation above the specified maximum operating junction
temperature may impair device reliability.

Note 4: Maximum junction temperature limits operating conditions. The
regulated output voltage specification does not apply for all possible
combinations of input voltage and output current. Limit the output current
range if operating at maximum input voltage. Limit the input voltage range
if operating at maximum output current.

Note 5: Typically the LT3020 supplies 100mA output current with a 1V
input supply. The guaranteed minimum input voltage for 100mA output
current is 1.10V.

Note 6: The LT3020 is tested and specified for these conditions with an
external resistor divider (20k and 30.1k) setting V
resistor divider adds 10µA of output load current. The line regulation and
load regulation specifications refer to the change in the 0.2V reference
voltage, not the 0.5V output voltage. Specifications for fixed output voltage
devices are referred to the output voltage.

= 10V, V

IN

V

= V

IN

= –10V, V

IN

OUT

= 1.2V, V

= 0V 360 mA

OUT

OUT(NOMINAL)

OUT

= 0V 3 5 µA

IN

LT3020-1.5 V
LT3020-1.8 V

to 0.5V. The external

OUT

+ 0.5V, ∆V

OUT

= –5%

●

110 310 mA

= 0V 1 10 µA

OUT
OUT
OUT

= 1.2V, V
= 1.5V, V
= 1.8V, V

= 0V 10 15 µA

IN

= 0V 10 15 µA

IN

= 0V 10 15 µA

IN

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 equals: (V

IN

– V

Note 8: GND pin current is tested with V

DROPOUT

).

= V

IN

OUT(NOMINAL)

and a current
source load. The device is tested while operating in its dropout region.
This condition forces the worst-case GND pin current. GND pin current
decreases at higher input voltages.

Note 9: Adjust pin bias current flows out of the ADJ pin.
Note 10: Shutdown pin current flows into the SHDN pin.
Note 11: Reverse output current is tested with IN grounded and OUT

forced to the rated output voltage. This current flows into the OUT pin and
out of the GND pin. For fixed voltage devices this includes the current in
the output resistor divider.

Note 12: The LT3020 is tested and specified for these conditions with an
external resistor divider (20k and 100k) setting V

to 1.2V. The external

OUT

resistor divider adds 10µA of load current.
Note 13: Reverse current is higher for the case of (rated_output) < V

because the no-load recovery circuitry is active in this region and is

V

IN,

OUT

trying to restore the output voltage to its nominal value.
Note 14: Minimum input voltage is the minimum voltage required by the

control circuit to regulate the output voltage and supply the full 100mA
rated current. This specification is tested at V

= 0.5V. At higher output

OUT

voltages the minimum input voltage required for regulation will be equal to
the regulated output voltage V

plus the dropout voltage.

OUT

<

4

3020fc

LT3020/LT3020-1.2/

INPUT VOLTAGE (V)

0

GND PIN CURRENT (µA)

2500

2250

2000

1500

1750

1250

1000

750

500

250

0

8

3020 G06

213579

4

6

10

V

OUT

= 1.2V

T

J

= 25°C

RL = 12Ω
I

L

= 100mA

RL = 24Ω
I

L

= 50mA

RL = 120Ω
I

L

= 10mA

RL = 1.2k, IL = 1mA

TEMPERATURE (°C)

–50

QUIESCENT CURRENT (µA)

250

225

200

150

175

125

100

75

50

25

0

3020 G03

250–25 50 75

125100

V

SHDN

= V

IN

V

SHDN

= 0V

VIN = 6V
V

OUT

= 1.2V

I

L

= 0

LT3020-1.5/LT3020-1.8

UW

TYPICAL PERFOR A CE CHARACTERISTICS

Typical Dropout Voltage Dropout Voltage Quiescent Current

250

225

200

175

150

125

100

75

DROPOUT VOLTAGE (mV)

50

25

0

0

TJ = 125°C

2010 30 50 70 90

OUTPUT CURRENT (mA)

TJ = 25°C

40

60

80

100

3020 G01

250

V

= 1.2V

OUT

225

200

175

150

125

100

75

DROPOUT VOLTAGE (mV)

50

25

0

–50

TEMPERATURE (°C)

250–25 50 75

IL = 100mA

IL = 50mA

IL = 10mA

IL = 1mA

125100

3020 G02

ADJ Pin Voltage

206

IL = 1mA

204

202

200

198

ADJ PIN VOLTAGE (mV)

196

194

–50

250–25 50 75

TEMPERATURE (°C)

Output Voltage

1.230
IL = 1mA

1.220

1.210

1.200

1.190

OUTPUT VOLTAGE (V)

1.180

1.170

–50

–25 0

50 100 125

25 75

TEMPERATURE (°C)

3020 G04

3020 G24

125100

Output Voltage Output Voltage

1.830
IL = 1mA

1.820

1.810

1.800

1.790

OUTPUT VOLTAGE (V)

1.780

1.770

–50

–25 0

Quiescent Current

1000

V

= 1.2V

OUT

= 0

I

900

L

= 25°C

T

J

800

700

600

500

400

300

QUIESCENT CURRENT (µA)

200

100

0

213579

0

50 100 125

25 75

TEMPERATURE (°C)

V

= V

SHDN

IN

V

= 0V

SHDN

6

4

INPUT VOLTAGE (V)

3020 G22

8

3020 G05

OUTPUT VOLTAGE (V)

10

1.530
IL = 1mA

1.520

1.510

1.500

1.490

1.480

1.470

–50

GND Pin Current

–25 0

50 100 125

25 75

TEMPERATURE (°C)

3020 G23

3020fc

5

LT3020/LT3020-1.2/

TEMPERATURE (°C)

–50

SHDN PIN THRESHOLD (V)

1.0

0.9

0.8

0.6

0.7

0.5

0.4

0.3

0.2

0.1

0

3020 G08

250–25 50 75

125100

IL = 1mA

LT3020-1.5/LT3020-1.8

UW

TYPICAL PERFOR A CE CHARACTERISTICS

Quiescent Current

1000

900

800

700

600

500

400

300

QUIESCENT CURRENT (µA)

200

100

0

0123

GND Pin Current

2500

2250

2000

1750

1500

1250

1000

750

GND PIN CURRENT (µA)

500

250

0

0123

V

IL = 0

TJ = 25°C

V

V

4

5

INPUT VOLTAGE (V)

V
TJ = 25°C

RL = 18Ω

= 100mA

I

L

RL = 36Ω
I

= 50mA

L

RL = 180Ω

= 10mA

I

L

4

5

INPUT VOLTAGE (V)

= 1.5V (LT 3020-1.5)

OUT

= V

SHDN

IN

= 0V

SHDN

678910

3020 G27

= 1.8V (LT 3020-1.8)

OUT

RL = 1.8k

= 1mA

I

L

678910

3020 G26

GND Pin Current

2500

2250

GND PIN CURRENT (µA)

2000

1750

1500

1250

1000

750

500

250

0

RL = 15Ω
I

L

RL = 30Ω

= 50mA

I

L

RL = 150Ω

= 10mA

I

L

0123

GND Pin Current vs I

2000

VIN = 1.7V

= 1.2V

V

1800

OUT

= 25°C

T

J

1600

1400

1200

1000

800

600

GND PIN CURRENT (µA)

400

200

0

2010 30 50 70 90

0

V

= 1.5V (LT 3020-1.5)

OUT

TJ = 25°C

= 100mA

RL = 1.5k

= 1mA

I

L

4

678910

5

INPUT VOLTAGE (V)

LOAD

60

40

OUTPUT CURRENT (mA)

Quiescent Current

3020 G28

1000

900

800

700

600

500

400

300

QUIESCENT CURRENT (µA)

200

100

0

0123

V

= 1.8V (LT 3020-1.8)

OUT

IL = 0

TJ = 25°C

V

= V

SHDN

V

= 0V

SHDN

4

678910

5

INPUT VOLTAGE (V)

IN

3020 G25

SHDN Pin Threshold

80

100

3020 G07

SHDN Pin Input Current

5.0

4.5

4.0

3.5

3.0

2.5

2.0

1.5

6

1.0

SHDN PIN INPUT CURRENT (µA)

0.5

0

0

TJ = 25°C

213579

SHDN PIN VOLTAGE (V)

6

4

SHDN Pin Input Current (µA)

5.0
V

= 10V

SHDN

4.5

4.0

3.5

3.0

2.5

2.0

1.5

1.0

SHDN PIN INPUT CURRENT (µA)

0.5

0

8

10

3020 G09

0

–50

250–25 50 75

TEMPERATURE (°C)

125100

3020 G10

ADJ Pin Bias Current

25

20

15

10

ADJ PIN BIAS CURRENT (nA)

5

0

–50

250–25 50 75

TEMPERATURE (°C)

125100

3020 G11

3020fc

TEMPERATURE (°C)

–50

LOAD REGULATION (mV)

1.0

0.8

0.6

0.2

0.4

0

–0.2

–0.4

–0.6

–0.8

–1.0

3020 G17

250–25 50 75

125100

VIN = 1.15V
V

OUT

= 0.5V
*LOAD REGULATION NUMBER REFERS
TO CHANGE IN THE 200mV REFERENCE
VOLTAGE

UW

FREQUENCY (Hz)

10

OUTPUT NOISE SPECTRAL DENSITY (µV/√Hz)

10

1

0.1

0.01
1k 100k 1M100 10k

3020 G18

V

OUT

= 1.2V

I

L

= 100mA

C

OUT

= 2.2µF

TYPICAL PERFOR A CE CHARACTERISTICS

LT3020/LT3020-1.2/

LT3020-1.5/LT3020-1.8

Current Limit

500

V

= 0V

OUT

450

400

350

300

250

200

150

CURRENT LIMIT (mA)

100

50

0

0

–50

VIN = 10V

VIN = 1.7V

TEMPERATURE (°C)

Input Ripple Rejection

100

90

80

70

60

50

40

30

RIPPLE REJECTION (dB)

20

VIN = 1.5V + 0.5V

= 0.5V

V

10

OUT

= 100mA

I

L

0

–50

TEMPERATURE (°C)

250–25 50 75

RIPPLE AT f = 120Hz

P-P

250–25 50 75

3020 G12

3020 G15

Reverse Output Current

500

VIN = 0V

= 1.2V

V

450

OUT

400

350

300

250

200

150

100

REVERSE OUTPUT CURRENT (µA)

50

0

0

125100

–50

250–25 50 75

TEMPERATURE (°C)

125100

3020 G13

Input Ripple Rejection

70

60

50

40

C

30

20

RIPPLE REJECTION (dB)

VIN = 1.5V + 50mV

10

= 0.5V

V

OUT

= 100mA

I

L

0

10 1k 10k 1M

100

RIPPLE

RMS

FREQUENCY (Hz)

OUT

C

OUT

= 10µF

= 2.2µF

100k

3020 G14

Load Regulation

Minimum Input Voltage

1.1
IL = 100mA

1.0

0.9

0.8

0.7

0.6

0.5

0.4

0.3

MINIMUM INPUT VOLTAGE (V)

0.2

0.1

0

125100

–50

250–25 50 75

TEMPERATURE (°C)

125100

3020 G16

∆IL = 1mA to 100mA

V

OUT

50mV/DIV

I

OUT

100mA/DIV

Transient Response

I

= 10mA TO 100mA

OUT

= 1.5V

V

OUT

50µs/DIV

Output Noise Spectral Density

3020 G21

3020fc

7

LT3020/LT3020-1.2/
LT3020-1.5/LT3020-1.8

UW

TYPICAL PERFOR A CE CHARACTERISTICS

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

300

V

= 1.2V

OUT

= 2.2µF

C

OUT

250

)

RMS

200

150

100

OUTPUT NOISE (µV

50

0

0.01 1 10 100

0.1
LOAD CURRENT (mA)

3020 G19

No-Load Recovery Threshold

18

16

14

12

10

8

6

4

OUTPUT CURRENT SINK (mA)

2

0

0

OUTPUT OVERSHOOT (%)

15105

20

3020 G20

U

UU

PI FU CTIO S

OUT (Pins 1, 2): These pins supply power to the load. Use
a minimum output capacitor of 2.2µF to prevent oscillations.
Applications with large load transients require larger out­put capacitors to limit peak voltage transients. See the
Applications Information section for more information on
output capacitance and reverse output characteristics.

OUT (Pin 3, Fixed Voltage Device Only): This pin is the
sense point for the internal resistor divider. It should be
tied directly to the other OUT pins (1, 2) for best results.

ADJ (Pin 3, Adjustable Device Only): This pin is the
inverting terminal to the error amplifier. Its typical input
bias current of 20nA flows out of the pin (see curve of ADJ
Pin Bias Current vs Temperature in the Typical Perfor­mance Characteristics). The ADJ pin reference voltage is
200mV (referred to GND).

GND (Pin 4): Ground.

SHDN (Pin 5): The SHDN pin puts the LT3020 into a low

power state. Pulling the SHDN pin low turns the output off.
Drive the SHDN pin with either logic or an open collector/
drain device with a pull-up resistor. The pull-up resistor

supplies the pull-up current to the open collector/drain
logic, normally several microamperes, and the SHDN pin
current, typically 2.3µA. If unused, connect the SHDN pin
to VIN. The LT3020 does not function if the SHDN pin is not
connected.

IN (Pins 7, 8): These pins supply power to the device. The
LT3020 requires a bypass capacitor at IN if it is more than
six inches away from the main input filter capacitor. The
output impedance of a battery rises with frequency, so
include a bypass capacitor in battery-powered circuits. A
bypass capacitor in the range of 2.2µF to 10µF suffices. The
LT3020 withstands reverse voltages on the IN pin with
respect to ground and the OUT pin. In the case of a reversed
input, which occurs if a battery is plugged in backwards,
the LT3020 acts as if a diode is in series with its input. No
reverse current flows into the LT3020 and no reverse volt­age appears at the load. The device protects itself and the
load.

GND (Pin 9, DD8 Package Only): Ground. Solder Pin 9
(the exposed pad) to the PCB. Connect directly to Pin 4 for
best performance.

8

3020fc

BLOCK DIAGRA

SHDN

(5)

SHUTDOWN

W

THERMAL

SHUTDOWN

LT3020/LT3020-1.2/

LT3020-1.5/LT3020-1.8

IN
(7, 8)

R3

D1

–

ERROR AMP

+

–

NO-LOAD

RECOVERY

BIAS CURRENT

AND

REFERENCE

GENERATOR

200mV

212mV

+

NOTE:
FOR LT3020 ADJUST PIN 3 IS CONNECTED TO
THE ADJUST PIN, R1 AND R2 ARE EXTERNAL.
FOR LT3020-1.X PIN 3 IS CONNECTED TO THE
OUTPUT SENSE PIN, R1 AND R2 ARE INTERNAL.

WUUU

APPLICATIO S I FOR ATIO

The LT3020 is a very low dropout linear regulator capable
of 0.9V input supply operation. Devices supply 100mA of
output current and dropout voltage is typically 150mV.
Quiescent current is typically 120µA and drops to 3µA in
shutdown. The LT3020 incorporates several protection
features, making it ideal for use in battery-powered sys­tems. The device protects itself against reverse-input and
reverse-output voltages. In battery backup applications
where the output is held up by a backup battery when the
input is pulled to ground, the LT3020 acts as if a diode is
in series with its output which prevents reverse current
flow. 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 10V without affecting start­up or normal operation.

Adjustable Operation

The LT3020’s output voltage range is 0.2V to 9.5V. Figure
1 shows that the output voltage is set by the ratio of two
external resistors. The device regulates the output to
maintain the ADJ pin voltage at 200mV referenced to
ground. The current in R1 equals 200mV/R1 and the

Q3

CURRENT

FIXED

V

OUT

1.2V

1.5V

1.8V

GAIN

R1

20k
20k
20k

R2

100k
130k
160k

Q1

D2

Q2

R2

25k

R1

3020 BD

OUT
(1, 2)

OUT SENSE
(3)

ADJ
(3)

GND
(4,9)

current in R2 is the current in R1 minus the ADJ pin bias
current. The ADJ pin bias current of 20nA flows out of the
pin. Use the formula in Figure 1 to calculate output voltage.
An R1 value of 20k sets the resistor divider current to
10µA. Note that in shutdown the output is turned off and
the divider current is zero. Curves of ADJ Pin Voltage vs
Temperature and ADJ Pin Bias Current vs Temperature
appear in the Typical Performance Characteristics section.

Specifications for output voltages greater than 200mV are
proportional to the ratio of desired output voltage to
200mV; (V

/200mV). For example, load regulation for

OUT

IN

V

IN

SHDN

= 200mV

V

OUT

= 200mV

V

ADJ

= 20nA AT 25°C

I

ADJ

OUTPUT RANGE = 0.2V TO 9.5V

OUT

LT3020-ADJ

ADJ

GND

R2

1 + – I

()

R1

ADJ

R2

R1

3020 F01

(R2)

V

OUT

+

Figure 1. Adjustable Operation

3020fc

9

LT3020/LT3020-1.2/
LT3020-1.5/LT3020-1.8

WUUU

APPLICATIO S I FOR ATIO

an output current change of 1mA to 100mA is typically

0.4mV at V

= 200mV. At V

ADJ

(1.5V/200mV) • (0.4mV) = 3mV

= 1.5V, load regulation is:

OUT

–20

20

0

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

X5R

Output Capacitance and Transient Response

The LT3020’s design is stable with a wide range of output
capacitors, but is optimized for low ESR ceramic capaci­tors. The output capacitor’s ESR affects stability, most
notably with small value capacitors. Use a minimum
output capacitor of 2.2µF with an ESR of 0.3Ω or less to
prevent oscillations. The LT3020 is a low voltage device,
and output load transient response is a function of output
capacitance. Larger values of output capacitance decrease
the peak deviations and provide improved transient re­sponse for larger load current changes. For output capaci­tor values greater than 20µF a small feedforward capacitor
with a value of 300pF across the upper divider resistor (R2
in Figure 1) is required.

Give extra consideration to the use of ceramic capacitors.
Manufacturers make ceramic capacitors with a variety of
dielectrics, each with a different behavior across tempera­ture and applied voltage. The most common dielectrics are
Z5U, Y5V, X5R and X7R. The Z5U and Y5V dielectrics
provide high C-V products in a small package at low cost,
but exhibit strong voltage and temperature coefficients.
The X5R and X7R dielectrics yield highly stable
characterisitics and are more suitable for use as the output
capacitor at fractionally increased cost. The X5R and X7R
dielectrics both exhibit excellent voltage coefficient char­acteristics. The X7R type works over a larger temperature
range and exhibits better temperature stability whereas
X5R is less expensive and is available in higher values.
Figures 2 and 3 show voltage coefficient and temperature
coefficient comparisons between Y5V and X5R material.

–40

–60

CHANGE IN VALUE (%)

–80

–100

0

26

4

DC BIAS VOLTAGE (V)

Y5V

14

8

12

10

16

3020 F02

Figure 2. 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

25 75

TEMPERATURE (°C)

X5R

Y5V

50 100 125

3020 F03

Figure 3. Ceramic Capacitor Temperature Characteristics

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. A ceramic capacitor produced Figure 4’s trace in

10

1mV/DIV

V
C
I

LOAD

OUT
OUT

= 1.3V
= 10µF

= 0

1ms/DIV 3020 F04

Figure 4. Noise Resulting from Tapping on a Ceramic Capacitor

3020fc

WUUU

APPLICATIO S I FOR ATIO

LT3020/LT3020-1.2/

LT3020-1.5/LT3020-1.8

response to light tapping from a pencil. Similar vibration
induced behavior can masquerade as increased output
voltage noise.

No-Load/Light-Load Recovery

A possible transient load step that occurs is where the
output current changes from its maximum level to zero
current or a very small load current. The output voltage
responds by overshooting until the regulator lowers the
amount of current it delivers to the new level. The regulator
loop response time and the amount of output capacitance
control the amount of overshoot. Once the regulator has
decreased its output current, the current provided by the
resistor divider (which sets V

) is the only current

OUT

remaining to discharge the output capacitor from the level
to which it overshot. The amount of time it takes for the
output voltage to recover easily extends to milliseconds
with microamperes of divider current and a few microfar­ads of output capacitance.

To eliminate this problem, the LT3020 incorporates a
no-load or light-load recovery circuit. This circuit is a
voltage-controlled current sink that significantly improves
the light load transient response time by discharging the
output capacitor quickly and then turning off. The current
sink turns on when the output voltage exceeds 6% of the
nominal output voltage. The current sink level is then
proportional to the overdrive above the threshold up to a
maximum of approximately 15mA. Consult the curve in
the Typical Performance Characteristics for the No-Load
Recovery Threshold.

If external circuitry forces the output above the no load
recovery circuit’s threshold, the current sink turns on in an
attempt to restore the output voltage to nominal. The
current sink remains on until the external circuitry releases
the output. However, if the external circuitry pulls the
output voltage above the input voltage, or the input falls
below the output, the LT3020 turns the current sink off and
shuts down the bias current/reference generator circuitry.

Thermal Considerations

The LT3020’s power handling capability is limited by its
maximum rated junction temperature of 125°C. The power
dissipated by the device is comprised of two components:

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

OUT

IN

– V

OUT

) and

)(V

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

)(VIN).

GND

GND pin current is found by examining the GND pin
current curves in the Typical Performance Characteristics.
Power dissipation is equal to the sum of the two compo­nents listed above.

The LT3020 regulator has internal thermal limiting (with
hysteresis) designed to protect the device during overload
conditions. For normal continuous conditions, do not
exceed the maximum junction temperature rating of 125°C.
Carefully consider all sources of thermal resistance from
junction to ambient including other heat sources mounted
in proximity to the LT3020.

The underside of the LT3020 DD package has exposed metal
(4mm2) from the lead frame to where the die is attached.
This allows heat to directly transfer from the die junction
to the printed circuit board metal to control maximum
operating junction temperature. The dual-in-line pin ar­rangement allows metal to extend beyond the ends of the
package on the topside (component side) of a PCB. Con­nect this metal to GND on the PCB. The multiple IN and OUT
pins of the LT3020 also assist in spreading heat to the PCB.

The LT3020 MS8 package has pin 4 fused with the lead
frame. This also allows heat to transfer from the die to the
printed circuit board metal, therefore reducing the thermal
resistance. Copper board stiffeners and plated through­holes can also be used to spread the heat generated by
power devices.

The following tables list thermal resistance for several
different board sizes and copper areas for two different
packages. Measurements were taken in still air on 3/32"
FR-4 board with one ounce copper.

Table 1. Measured Thermal Resistance for DD Package

COPPER AREA THERMAL RESISTANCE

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

2500mm22500mm

2

900mm
225mm
100mm

50mm

2500mm

2

2500mm

2

2500mm

2

2500mm

2

2

2

2

2

2500mm
2500mm
2500mm
2500mm
2500mm

2

2

2

2

2

35°C/W
40°C/W
55°C/W
60°C/W
70°C/W

3020fc

11

LT3020/LT3020-1.2/
LT3020-1.5/LT3020-1.8

WUUU

APPLICATIO S I FOR ATIO

Table 2. Measured Thermal Resistance for MS8 Package

COPPER AREA THERMAL RESISTANCE

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

2500mm22500mm
1000mm22500mm

225mm22500mm
100mm22500mm

2

50mm

*Device is mounted on topside.

2500mm

2

2500mm

2

2500mm

2

2500mm

2

2500mm

2

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 1.8V, an input voltage
range of 2.25V to 2.75V, an output current range of 1mA
to 100mA, and a maximum ambient temperature of 70°C,
what will the maximum junction temperature be for an
application using the DD package?

The power dissipated by the device is equal to:

I

OUT(MAX)(VIN(MAX)

– V

OUT

) + I

GND(VIN(MAX)

)

where

at (I

= 100mA

= 2.75V

= 100mA, V

OUT

= 2.75V) = 3mA

IN

I

OUT(MAX)

V

IN(MAX)

I

GND

so

P = 100mA(2.75V – 1.8V) + 3mA(2.75V) = 0.103W

The thermal resistance is in the range of 35°C/W to
70°C/W depending on the copper area. So the junction
temperature rise above ambient is approximately equal to:

0.103W(52.5°C/W) = 5.4°C

The maximum junction temperature equals the maximum
junction temperature rise above ambient plus the maxi­mum ambient temperature or:

= 70°C + 5.4°C = 75.4°C

T

JMAX

Protection Features

The LT3020 incorporates several protection features that
make it 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 device also protects against reverse­input voltages, reverse-output voltages and reverse
output-to-input voltages.

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

The IN pins of the device withstand reverse voltages of
10V. The LT3020 limits current flow to less than 1µA and
no negative voltage appears at OUT. The device protects
both itself and the load against batteries that are plugged
in backwards.

The LT3020 incurs no damage if OUT is pulled below
ground. If IN is left open circuit or grounded, OUT can be
pulled below ground by 10V. No current flows from the
pass transistor connected to OUT. However, current flows
in (but is limited by) the resistor divider that sets the output
voltage. Current flows from the bottom resistor in the
divider and from the ADJ pin’s internal clamp through the
top resistor in the divider to the external circuitry pulling
OUT below ground. If IN is powered by a voltage source,
OUT sources current equal to its current limit capability
and the LT3020 protects itself by thermal limiting. In this
case, grounding SHDN turns off the LT3020 and stops
OUT from sourcing current.

The LT3020 incurs no damage if the ADJ pin is pulled
above or below ground by 10V. If IN is left open circuit or
grounded and ADJ is pulled above ground, ADJ acts like a
25k resistor in series with a 1V clamp (one Schottky diode
in series with one diode). ADJ acts like a 25k resistor in
series with a Schottky diode if pulled below ground. If IN
is powered by a voltage source and ADJ is pulled below its
reference voltage, the LT3020 attempts to source its
current limit capability at OUT. The output voltage in­creases to VIN – V

DROPOUT

with V

DROPOUT

set by whatever
load current the LT3020 supports. This condition can
potentially damage external circuitry powered by the
LT3020 if the output voltage increases to an unregulated
high voltage. If IN is powered by a voltage source and ADJ
is pulled above its reference voltage, two situations can
occur. If ADJ is pulled slightly above its reference voltage,
the LT3020 turns off the pass transistor, no output current
is sourced and the output voltage decreases to either the
voltage at ADJ or less. If ADJ is pulled above its no load
recovery threshold, the no load recovery circuitry turns on
and attempts to sink current. OUT is actively pulled low

3020fc

12

WUUU

APPLICATIO S I FOR ATIO

LT3020/LT3020-1.2/

LT3020-1.5/LT3020-1.8

and the output voltage clamps at a Schottky diode above
ground. Please note that the behavior described above
applies to the LT3020 only. If a resistor divider is con­nected under the same conditions, there will be additional
V/R current.

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. In the case where the input is grounded, there is
less than 1µA of reverse output current.

If the LT3020 IN pin is forced below the OUT pin or the OUT
pin is pulled above the IN pin, input current drops to less
than 10µA typically. This occurs if the LT3020 input is
connected to a discharged (low voltage) battery and either
a backup battery or a second regulator circuit holds up the
output. The state of the SHDN pin has no effect on the
reverse output current if OUT is pulled above IN.

Input Capacitance and Stability

The LT3020 is designed to be stable with a minimum
capacitance of 2.2µF placed at the IN pin. Ceramic capaci-
tors with very low ESR may be used. However, in cases
where a long wire is used to connect a power supply to the
input of the LT3020 (and also from the ground of the
LT3020 back to the power supply ground), use of low
value input capacitors combined with an output load
current of 20mA or greater may result in an unstable
application. This is due to the inductance of the wire
forming an LC tank circuit with the input capacitor and not
a result of the LT3020 being unstable.

The self-inductance, or isolated inductance, of a wire is
directly proportional to its length. However, the diameter

of a wire does not have a major influence on its self­inductance. For example, the self inductance of a 2-AWG
isolated wire with a diameter of 0.26 in. is about half the
inductance of a 30-AWG wire with a diameter of 0.01 in.

One foot of 30-AWG wire has 465nH of self inductance.

The overall self-inductance of a wire can be reduced in two
ways. One is to divide the current flowing towards the
LT3020 between two parallel conductors. In this case, the
farther the wires are placed apart from each other, the
more inductance will be reduced, up to a 50% reduction
when placed a few inches apart. Splitting the wires basi­cally connects two equal inductors in parallel. However,
when placed in close proximity from each other, mutual
inductance is added to the overall self inductance of the
wires. The most effective way to reduce overall inductance
is to place the forward and return-current conductors (the
wire for the input and the wire for ground) in very close
proximity. Two 30-AWG wires separated by 0.02 in. re­duce the overall self-inductance to about one-fifth of a
single isolated wire.

If the LT3020 is powered by a battery mounted in close
proximity on the same circuit board, a 2.2µF input capaci-
tor is sufficient for stability. However, if the LT3020 is
powered by a distant supply, use a larger value input
capacitor following the guideline of roughly 1µF (in addi-
tion to the 2.2µF minimum) per 8 inches of wire length. As
power supply output impedance may vary, the minimum
input capacitance needed to stabilize the application may
also vary. Extra capacitance may also be placed directly on
the output of the power supply; however, this will require
an order of magnitude more capacitance as opposed to
placing extra capacitance in close proximity to the LT3020.
Furthermore, series resistance may be placed between the
supply and the input of the LT3020 to stabilize the appli­cation; as little as 0.1Ω to 0.5Ω will suffice.

3020fc

13

LT3020/LT3020-1.2/
LT3020-1.5/LT3020-1.8

PACKAGE DESCRIPTIO

U

DD Package

8-Lead Plastic DFN (3mm × 3mm)

(Reference LTC DWG # 05-08-1698)

0.675 ±0.05

3.5 ±0.05

1.65 ±0.05
(2 SIDES)2.15 ±0.05

PACKAGE
OUTLINE

0.25 ± 0.05

RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS

PIN 1

TOP MARK

(NOTE 6)

0.200 REF

NOTE:

1. DRAWING TO BE MADE A JEDEC PACKAGE OUTLINE M0-229 VARIATION OF (WEED-1)

2. DRAWING NOT TO SCALE

3. ALL DIMENSIONS ARE IN MILLIMETERS

4. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE
MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.15mm ON ANY SIDE

5. EXPOSED PAD SHALL BE SOLDER PLATED

6. SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION
ON TOP AND BOTTOM OF PACKAGE

2.38 ±0.05
(2 SIDES)

0.50
BSC

3.00 ±0.10
(4 SIDES)

0.75 ±0.05

0.00 – 0.05

1.65 ± 0.10
(2 SIDES)

R = 0.115

TYP

0.25 ± 0.05

2.38 ±0.10
(2 SIDES)

BOTTOM VIEW—EXPOSED PAD

0.38 ± 0.10

85

14

0.50 BSC

(DD8) DFN 1203

14

3020fc

PACKAGE DESCRIPTIO

U

MS8 Package

8-Lead Plastic MSOP

(Reference LTC DWG # 05-08-1660)

0.889 ± 0.127
(.035 ± .005)

LT3020/LT3020-1.2/

LT3020-1.5/LT3020-1.8

5.23

(.206)

MIN

0.42 ± 0.038

(.0165 ± .0015)

TYP

RECOMMENDED SOLDER PAD LAYOUT

0.254
(.010)

GAUGE PLANE

0.18

(.007)

NOTE:

1. DIMENSIONS IN MILLIMETER/(INCH)

2. DRAWING NOT TO SCALE

3. DIMENSION DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS.
MOLD FLASH, PROTRUSIONS OR GATE BURRS SHALL NOT EXCEED 0.152mm (.006") PER SIDE

4. DIMENSION DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSIONS.
INTERLEAD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.152mm (.006") PER SIDE

5. LEAD COPLANARITY (BOTTOM OF LEADS AFTER FORMING) SHALL BE 0.102mm (.004") MAX

DETAIL “A”

(.126 – .136)

(.0256)

° – 6° TYP

0

DETAIL “A”

3.20 – 3.45

0.65

BSC

0.53 ± 0.152

(.021 ± .006)

SEATING

PLANE

3.00 ± 0.102

(.118 ± .004)

(NOTE 3)

4.90

± 0.152

(.193 ± .006)

0.22 – 0.38

(.009 – .015)

TYP

1.10

(.043)

MAX

8

12

0.65

(.0256)

BSC

7

6

3

5

4

0.52

(.0205)

REF

3.00 ± 0.102

(.118 ± .004)

(NOTE 4)

0.86

(.034)

REF

0.127 ± 0.076
(.005 ± .003)

MSOP (MS8) 0204

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.

3020fc

15

LT3020/LT3020-1.2/
LT3020-1.5/LT3020-1.8

RELATED PARTS

PART NUMBER DESCRIPTION COMMENTS

LT1121/LT1121HV 150mA, Micropower LDOs VIN: 4.2V to 30V/36V, V

= 16µA, Reverse-Battery Protection, SOT-223, S8, Z Packages

I

SD

LT1129 700mA, Micropower LDO VIN: 4.2V to 30V, V

DD, SOT-223, S8, TO220-5, TSSOP20 Packages

LT1761 100mA, Low Noise Micropower LDO VIN: 1.8V to 20V, V

Low Noise: < 20µV
ThinSOT Package

LT1762 150mA, Low Noise Micropower LDO VIN: 1.8V to 20V, V

Low Noise: <20µV

LT1763 500mA, Low Noise Micropower LDO VIN: 1.8V to 20V, V

Low Noise: < 20µV

LT1764/LT1764A 3A, Low Noise, Fast Transient Response LDOs VIN: 2.7V to 20V, V

Low Noise: <40µV
DD, TO220-5 Packages

LTC1844 150mA, Low Noise, Micropower VLDO VIN: 1.6V to 6.5V, V

Low Noise: < 30µV

LT1962 300mA, Low Noise Micropower LDO VIN: 1.8V to 20V, V

Low Noise: < 20µV

LT1963/LT1963A 1.5A, Low Noise, Fast Transient Response LDOs VIN: 2.1V to 20V, V

Low Noise: < 40µV
DD, TO220-5, SOT223, S8 Packages

LT1964 200mA, Low Noise Micropower, Negative LDO VIN: –2.2V to –20V, V

Low Noise: <30µV
ThinSOT Package

LT3010 50mA, High Voltage, Micropower LDO VIN: 3V to 80V, V

Low Noise: <100µV
MS8E Package

LTC3025 300mA, Low Voltage, Micropower LDO VIN: 0.9V to 5.5V, V

1µF Ceramic Capacitors, DFN-6 Package

LT3150 Low VIN, Fast Transient Response, VLDO Controller VIN: 1.1V to 10V, V

, 1.4MHz Boost Converter Generates Gate Drive, SSOP16 Package

R

DS(ON)

OUT(MIN)

OUT(MIN)

RMS

OUT(MIN)

RMS

OUT(MIN)
RMS

OUT(MIN)

RMS

OUT(MIN)

RMS

OUT(MIN)
RMS

OUT(MIN)
RMS

OUT(MIN)

RMS

OUT(MIN)

RMS

OUT(MIN)

OUT(MIN)

OUT(MIN)

= 3.75V, V

= 1.22V, V

= 3.75V, V

= 0.42V, IQ = 30µA,

DO

= 0.4V, IQ = 50µA, I

DO

= 0.3V, IQ = 20µA, I

DO

SD

SD

= 16µA,

< 1µA,

, Stable with 1µF Ceramic Capacitor,

= 1.22V, V

= 0.3V, IQ = 25µA, I

DO

SD

< 1µA,

, MS8 Package

= 1.22V, V

= 0.3V, IQ = 30µA, I

DO

SD

< 1µA,

, S8 Package

= 1.21V, V

= 0.34V, IQ = 1mA, I

DO

SD

< 1µA,

, “A” Version Stable with Ceramic Capacitors,

= 1.25V, V

= 0.09V, IQ = 35µA, ISD < 1µA,

DO

, ThinSOT Package

= 1.22V, V

= 0.27V, IQ = 30µA, I

DO

SD

< 1µA,

, MS8 Package

= 1.21V, V

= 0.34V, IQ = 1mA, I

DO

SD

< 1µA,

, “A” Version Stable with Ceramic Capacitors,

= 1.21V, V

= 0.34V, IQ = 30µA, I

DO

SD

= 3µA,

, Stable with Ceramic Capacitors,

= 1.2V, V

= 0.3V, IQ = 30µA, I

DO

SD

< 1µA,

, Stable with 1µF Output Capacitor, Exposed

= 0.4V, V

= 1.23V, V

= 0.05V, IQ = 54µA, Stable with

DO

= Set by External MOSFET

DO

16

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

[phone] ● FAX: [phone]

●

www.linear.com

3020fc

LT/LT 0905 REV C • PRINTED IN USA

© LINEAR TECHNOLOGY CORPORATION 2004