LT3021EDH-1.8#PBF - ANALOG DEVICES

LT3021/LT3021-1.2/

LT3021-1.5/LT3021-1.8

Rev.D

For more information www.analog.com

TYPICAL APPLICATION

FEATURES

APPLICATIONS

DESCRIPTION

500mA, Low Voltage,

Very Low Dropout

Linear Regulator

The LT

3021 is a very low dropout voltage (VLDO™) lin-

ear regulator that operates from input supplies down to

0.9V

. This device supplies 500mA of output current with

a typical dropout voltage of 155mV. The LT3021 is ideal

for low input voltage to low output voltage applications,

providing comparable electrical efﬁciency to that of a

switching regulator.

The LT3021 regulator optimizes stability and transient

response with low ESR, ceramic output capacitors as small

as 3.3µF. Other LT3021 features include 0.05% typical line

regulation and 0.2% typical load regulation. In shutdown,

quiescent current typically drops to 3µA.

Internal protection circuitry includes reverse-battery pro-

tection, current limiting, thermal limiting with hysteresis,

and reverse-current protection. The LT3021 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 LT3021 regulator is available in the low proﬁle

(0.75mm) 16-pin (5mm × 5mm) DFN package with ex-

posed pad and the 8-lead SO package.

1.8V to 1.5V, 500mA VLDO Regulator

n VIN Range: 0.9V to 10V

n Dropout Voltage: 155mV Typical

n Output Current: 500mA

n Adjustable Output (VREF = VOUT(MIN) = 200mV)

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

n Stable with Low ESR, Ceramic Output Capacitors

(3.3µF Minimum)

n 0.2% Load Regulation from 1mA to 500mA

n Quiescent Current: 110µA (Typ)

n 3µA Typical Quiescent Current in Shutdown

n Current Limit Protection

n Reverse-Battery Protection

n No Reverse Current

n Thermal Limiting with Hysteresis

n 16-Pin DFN (5mm × 5mm) and 8-Lead

SO Packages

n Low Current Regulators

n Battery-Powered Systems

n Cellular Phones

n Pagers

n Wireless Modems All registered trademarks and trademarks are the property of their respective owners.

Minimum Input Voltage

SHDN SENSE

3.3μF

3021 TA01

OUT

VIN

1.8V

GND

LT3021-1.5

OUT

1.5V

500mA

3.3μF

TEMPERATURE (°C)

–50

MINIMUM INPUT VOLTAGE (V)

1.1

1.0

0.9

0.8

0.6

0.7

0.5

0.4

0.3

0.2

0.1

3021 TA02

250–25 50 75 125100

IL = 500mA

Document Feedback

LT3021/LT3021-1.2/

LT3021-1.5/LT3021-1.8

Rev.D

For more information www.analog.com

ABSOLUTE MAXIMUM RATINGS

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

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

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

ADJ/SENSE Pin Voltage ....................................... ±10V

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

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

(Note 1)

PGND

SHDN

OUT

ADJ

AGND

TOP VIEW

LT3021-ADJ

DH PACKAGE

16-LEAD (5mm × 5mm) PLASTIC DFN

TJMAX = 125°C, θJA = 35°C/ W*, θJC = 3°C/W**

EXPOSED PAD IS GND (PIN 17) CONNECT TO PINS 8, 10

EXPOSED PAD MUST BE SOLDERED TO THE PCB

*SEE THE APPLICATIONS INFORMATION SECTION

**MEASURED JUNCTION TO PIN 17

PGND

SHDN

OUT

SENSE

AGND

TOP VIEW

LT3021-FIXED

DH PACKAGE

16-LEAD (5mm × 5mm) PLASTIC DFN

TJMAX = 125°C, θJA = 35°C/ W*, θJC = 3°C/W**

EXPOSED PAD IS GND (PIN 17) CONNECT TO PINS 8, 10

EXPOSED PAD MUST BE SOLDERED TO THE PCB

*SEE THE APPLICATIONS INFORMATION SECTION

**MEASURED JUNCTION TO PIN 17

TOP VIEW

PGND

SHDN

OUT

ADJ

AGND

LT3021-ADJ

S8 PACKAGE

8-LEAD PLASTIC SO

TJMAX = 150°C, θJA = 70°C/ W*, θJC = 40°C/W**

*SEE THE APPLICATIONS INFORMATION SECTION

**MEASURED JUNCTION TO PIN 6

TOP VIEW

PGND

SHDN

OUT

SENSE

AGND

LT3021-FIXED

S8 PACKAGE

8-LEAD PLASTIC SO

TJMAX = 150°C, θJA = 70°C/ W*, θJC = 40°C/W**

*SEE THE APPLICATIONS INFORMATION SECTION

**MEASURED JUNCTION TO PIN 6

PIN CONFIGURATION

Operating Junction Temperature Range (E, I Grade)

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

Storage Temperature Range

DH .....................................................– 65°C to 125°C

S8 ......................................................– 65°C to 150°C

Lead Temperature (Soldering, 10 sec, S8) ............ 300°C

LT3021/LT3021-1.2/

LT3021-1.5/LT3021-1.8

Rev.D

For more information www.analog.com

ORDER INFORMAITON

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

LT3021EDH#PBF LT3021EDH#TRPBF 3021 16-Lead (5mm × 5mm) Plastic DFN –40°C to 125°C

LT3021EDH-1.2#PBF LT3021EDH-1.2#TRPBF 302112 16-Lead (5mm × 5mm) Plastic DFN –40°C to 125°C

LT3021EDH-1.5#PBF LT3021EDH-1.5#TRPBF 302115 16-Lead (5mm × 5mm) Plastic DFN –40°C to 125°C

LT3021EDH-1.8#PBF LT3021EDH-1.8#TRPBF 302118 16-Lead (5mm × 5mm) Plastic DFN –40°C to 125°C

LT3021ES8#PBF LT3021ES8#TRPBF 3021 8-Lead Plastic SO –40°C to 125°C

LT3021ES8-1.2#PBF LT3021ES8-1.2#TRPBF 302112 8-Lead Plastic SO –40°C to 125°C

LT3021ES8-1.5#PBF LT3021ES8-1.5#TRPBF 302115 8-Lead Plastic SO –40°C to 125°C

LT3021ES8-1.8#PBF LT3021ES8-1.8#TRPBF 302118 8-Lead Plastic SO –40°C to 125°C

LT3021IS8-1.8#PBF LT3021IS8-1.8#TRPBF 302118 8-Lead Plastic SO –40°C to 125°C

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

LT3021EDH LT3021EDH#TR 3021 16-Lead (5mm × 5mm) Plastic DFN –40°C to 125°C

LT3021EDH-1.2 LT3021EDH-1.2#TR 302112 16-Lead (5mm × 5mm) Plastic DFN – 40°C to 125°C

LT3021EDH-1.5 LT3021EDH-1.5#TR 302115 16-Lead (5mm × 5mm) Plastic DFN – 40°C to 125°C

LT3021EDH-1.8 LT3021EDH-1.8#TR 302118 16-Lead (5mm × 5mm) Plastic DFN – 40°C to 125°C

LT3021ES8 LT3021ES8#TR 3021 8-Lead Plastic SO –40°C to 125°C

LT3021ES8-1.2 LT3021ES8-1.2#TR 302112 8-Lead Plastic SO –40°C to 125°C

LT3021ES8-1.5 LT3021ES8-1.5#TR 302115 8-Lead Plastic SO –40°C to 125°C

LT3021ES8-1.8 LT3021ES8-1.8#TR 302118 8-Lead Plastic SO –40°C to 125°C

LT3021IS8-1.8 LT3021IS8-1.8#TR 302118 8-Lead Plastic SO –40°C to 125°C

Contact the factory for parts speciﬁed with wider operating temperature ranges. *The temperature grade is identiﬁed by a label on the shipping container.

Tape and reel specifications. Some packages are available in 500 unit reels through designated sales channels with #TRMPBF sufﬁx.

LT3021/LT3021-1.2/

LT3021-1.5/LT3021-1.8

Rev.D

For more information www.analog.com

ELECTRICAL CHARACTERISTICS

The l denotes the speciﬁcations which apply over the full operating

temperature range, otherwise speciﬁcations are at TJ = 25°C.

SYMBOL CONDITIONS MIN TYP MAX UNITS

Minimum Input Voltage

(Notes 5,14)

ILOAD = 500mA, TJ > 0°C

ILOAD = 500mA, TJ < 0°C

0.9

1.05

1.10

ADJ Pin Voltage (Notes 4, 5) VIN = 1.5V, ILOAD = 1mA

1.15V < VIN < 10V, 1mA < ILOAD < 500mA

196

193

200

204

206

Regulated Output Voltage

(Note 4)

T3021-1.2 VIN = 1.5V, ILOAD = 1mA

1.5V < VIN < 10V, 1mA < ILOAD < 500mA

1.176

1.157

1.200

1.224

1.236

T3021-1.5 VIN = 1.8V, ILOAD = 1mA

1.8V < VIN < 10V, 1mA < ILOAD < 500mA

1.470

1.447

1.500

1.530

1.545

T3021-1.8 VIN = 2.1V, ILOAD = 1mA

2.1V < VIN < 10V, 1mA < ILOAD < 500mA

1.764

1.737

1.800

1.836

1.854

Line Regulation (Note 6) L

T3021 ΔVIN = 1.15V to 10V, ILOAD = 1mA

LT3021-1.2 ΔVIN = 1.5V to 10V, ILOAD = 1mA

LT3021-1.5 ΔVIN = 1.8V to 10V, ILOAD = 1mA

LT3021-1.8 ΔVIN = 2.1V to 10V, ILOAD = 1mA

–1.75

–10.5

–13

–15.8

+1.75

10.5

15.8

Load Regulation (Note 6) L

T3021 VIN = 1.15V, ΔILOAD = 1mA to 500mA

LT3021-1.2 VIN = 1.5V, ΔILOAD = 1mA to 500mA

LT3021-1.5 VIN = 1.8V, ΔILOAD = 1mA to 500mA

LT3021-1.8 VIN = 2.1V, ΔILOAD = 1mA to 500mA

–2

–6

–7.5

–9

0.4

1.5

7.5

Dropout Voltage (Notes 7, 12) ILOAD = 10mA

ILOAD = 10mA

45 75

110

ILOAD = 500mA

155 190

285

GND Pin Current

VIN = VOUT(NOMINAL) + 0.4V

(Notes 8, 12)

ILOAD = 0mA

ILOAD = 10mA

ILOAD = 100mA

ILOAD = 500mA

110

920

2.25

6.20

250

µA

Output Voltage Noise COUT = 4.7µF, ILOAD = 500mA, BW = 10Hz to 100kHz, VOUT = 1.2V 300 µVRMS

ADJ Pin Bias Current VADJ = 0.2V, VIN = 1.2V (Notes 6, 9) 20 50 nA

Shutdown Threshold VOUT = Off to On

VOUT = On to Off

0.25

0.61

0.9 V

SHDN Pin Current (Note 10) VSHDN = 0V, VIN = 10V

VSHDN = 10V, VIN = 10V

±1

9.5

µA

Quiescent Current in Shutdown VIN = 6V, VSHDN= 0V 3 9 µA

Ripple Rejection (Note 6) L

T3021 VIN – VOUT = 1V, VRIP = 0.5VP-P , fRIPPLE = 120Hz,

ILOAD = 500mA

70 dB

LT3021-1.2 VIN – VOUT = 1V, VRIPPLE = 0.5VP-P , fRIPPLE = 120Hz,

ILOAD = 500mA

60 dB

LT3021-1.5 VIN – VOUT = 1V, VRIPPLE = 0.5VP-P , fRIPPLE = 120Hz,

ILOAD = 500mA

58 dB

LT3021-1.8 VIN – VOUT = 1V, VRIPPLE = 0.5VP-P , fRIPPLE = 120Hz,

ILOAD = 500mA

56 dB

Current Limit (Note 12) VIN = 10V, VOUT = 0V

VIN = VOUT(NOMINAL) + 0.5V, ΔVOUT = –5%

550

1.8 A

Input Reverse Leakage Current VIN = –10V, VOUT = 0V 1 20 µA

Reverse Output Current

(Notes 11, 13)

T3021 VOUT = 1.2V, VIN = 0V

LT3021-1.2 VOUT = 1.2V, VIN = 0V

LT3021-1.5 VOUT = 1.5V, VIN = 0V

LT3021-1.8 VOUT = 1.8V, VIN = 0V

0.5

µA

LT3021/LT3021-1.2/

LT3021-1.5/LT3021-1.8

Rev.D

For more information www.analog.com

TYPICAL PERFORMANCE CHARACTERISTICS

Dropout Voltage

Minimum Input Voltage

OUTPUT CURRENT (mA)

DROPOUT VOLTAGE (mV)

250

225

200

150

175

125

100

3021 G01

200100 300 400 500

TJ = 125°C

TJ = 25°C

TEMPERATURE (°C)

–50

DROPOUT VOLTAGE (mV)

250

225

200

150

175

125

100

3021 G02

250–25 50 75 125100

IL = 1mA

IL = 100mA

IL = 250mA

IL = 500mA

IL = 50mA

IL = 10mA

VOUT = 1.2V

TEMPERATURE (°C)

–50

MINIMUM INPUT VOLTAGE (V)

1.2

1.1

1.0

0.9

0.8

0.6

0.7

0.5

0.4

0.3

0.2

3021 G16

250–25 50 75 125100

IL = 500mA

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 LT3021 regulators are tested and speciﬁed under pulse load

conditions such that TJ ≈ TA. The LT3021E regulators are 100% tested

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

characterization and correlation with statistical process controls. The

LT3021I regulators are guaranteed over the full –40ºC to 125ºC 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 LT3021 supplies 500mA output current with a 1V

input supply. The guranteed minimum input voltage for 500mA output

current is 1.10V.

Note 6: The LT3021 is tested and speciﬁed for these conditions with an

external resistor divider (20k and 30.1k) setting VOUT to 0.5V. The external

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.

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: (VIN – VDROPOUT).

Note 8: GND pin current is tested with VIN = VOUT(NOMINAL) + 0.4V and a

current source load. GND pin current will increase in dropout. See GND pin

current curves in the Typical Performance Characteristics section.

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 LT3021 is tested and speciﬁed for these conditions with an

external resistor divider (20k and 100k) setting VOUT to 1.2V. The external

resistor divider adds 10µA of load current.

Note 13: Reverse current is higher for the case of (rated_output) < VOUT

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

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 500mA

rated current. This speciﬁcation is tested at VOUT = 0.5V. At higher output

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

the regulated output voltage VOUT plus the dropout voltage.

ELECTRICAL CHARACTERISTICS

The l denotes the speciﬁcations which apply over the full operating

temperature range, otherwise speciﬁcations are at TJ = 25°C.

LT3021/LT3021-1.2/

LT3021-1.5/LT3021-1.8

Rev.D

For more information www.analog.com

TYPICAL PERFORMANCE CHARACTERISTICS

ADJ Pin Voltage

ADJ Pin Bias Current

Quiescent Current

Output Voltage

Quiescent Current

TEMPERATURE (°C)

–50

ADJ PIN VOLTAGE (mV)

206

204

202

198

200

196

194

3021 G04

250–25 50 75 125100

TEMPERATURE (°C)

–50

ADJ PIN BIAS CURRENT (nA)

3021 G11

250–25 50 75 125100

TEMPERATURE (°C)

–50

250

225

200

150

175

125

100

0250–25 50 75 125100

QUIESCENT CURRENT (

μA)

3021 G05

VIN = 6V

VOUT = 1.2V

IL = 0

VSHDN = VIN

VSHDN = 0V

TEMPERATURE (°C)

–50

OUTPUT VOLTAGE (V)

1.23

1.22

1.21

1.20

1.19

1.18

1.17 25 75

3021 G28

–25 0 50 100 125

ILOAD = 1mA

TEMPERATURE (°C)

–50

OUTPUT VOLTAGE (V)

1.53

1.52

1.51

1.50

1.49

1.48

1.47 25 75

3021 G23

–25 0 50 100 125

ILOAD = 1mA

TEMPERATURE (°C)

–50

OUTPUT VOLTAGE (V)

1.83

1.82

1.81

1.80

1.79

1.78

1.77 25 75

3021 G22

–25 0 50 100 125

ILOAD = 1mA

INPUT VOLTAGE (V)

QUIESCENT CURRENT (mA)

3.0

2.5

2.0

1.0

1.5

0.5

3021 G03

321 5 84 76 109

VSHDN = VIN

VSHDN = 0V

VOUT = 1.2V

IL = 0

TJ = 25°C

INPUT VOLTAGE (V)

QUIESCENT CURRENT (mA)

3.0

2.5

2.0

1.5

1.0

0.5

02 4 6 8

3021 G26

1010 3 5 7 9

VOUT = 1.5V

IL = 0

TJ = 25°C

VSHDN = 0V

VSHDN = VIN

INPUT VOLTAGE (V)

QUIESCENT CURRENT (mA)

3.0

2.5

2.0

1.5

1.0

0.5

02 4 6 8

3021 G27

1010 3 5 7 9

VOUT = 1.8V

IL = 0

TJ = 25°C

VSHDN = 0V

VSHDN = VIN

LT3021/LT3021-1.2/

LT3021-1.5/LT3021-1.8

Rev.D

For more information www.analog.com

TYPICAL PERFORMANCE CHARACTERISTICS

GND Pin Current

GND Pin Current vs ILOAD

SHDN Pin Threshold

SHDN Pin Input Current

INPUT VOLTAGE (V)

GND PIN CURRENT (mA)

3021 G06

21 3 5 7 9

4610

VOUT = 1.2V

TJ = 25°C

RL = 12Ω

IL = 100mA

RL = 2.4Ω

IL = 500mA

RL = 4.8Ω

IL = 250mA RL = 24Ω

IL = 50mA RL = 120Ω

IL = 10mA

RL = 1.2k, IL = 1mA

INPUT VOLTAGE (V)

GND PIN CURRENT (mA)

02 4 6 8

3021 G24

1010 3 5 7 9

VOUT = 1.5V

TJ = 25°C

RL = 3Ω

IL = 500mA

RL = 6Ω

IL = 250mA

RL = 15Ω

IL = 100mA

RL = 30Ω

IL = 50mA

RL = 1.5k, IL = 1mA

RL = 150Ω

IL = 10mA

INPUT VOLTAGE (V)

GND PIN CURRENT (mA)

02 4 6 8

3021 G25

1010 3 5 7 9

VOUT = 1.8V

TJ = 25°C

RL = 3.6Ω

IL = 500mA

RL = 7.2Ω

IL = 250mA

RL = 18Ω

IL = 100mA

RL = 36Ω

IL = 50mA

RL = 1.8k, IL = 1mA

RL = 180Ω

IL = 10mA

LOAD CURRENT (mA)

GND PIN CURRENT (mA)

3021 G07

200100 300 400 500

VSHDN = 10V

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

3021 G08

250–25 50 75 125100

IL = 1mA

SHDN PIN VOLTAGE (V)

SHDN PIN INPUT CURRENT (μA)

5.0

4.5

4.0

3.0

3.5

2.5

2.0

1.5

1.0

0.5

3021 G09

21 3 5 7 9

4610

LT3021/LT3021-1.2/

LT3021-1.5/LT3021-1.8

Rev.D

For more information www.analog.com

TYPICAL PERFORMANCE CHARACTERISTICS

SHDN Pin Input Current

Current Limit

Reverse Output Current

TEMPERATURE (°C)

–50

3021 G10

250–25 50 75 125100

VSHDN = 10V

SHDN PIN INPUT CURRENT (μA)

TEMPERATURE (°C)

–50

3021 G12

250–25 50 75 125100

VOUT = 0V

VIN = 1.7V

VIN = 10V

CURRENT LIMIT (A)

2.0

1.8

1.6

1.2

1.4

1.0

0.8

0.6

0.4

0.2

TEMPERATURE (°C)

–50

3021 G13

250–25 50 75 125100

VIN = 0V

VOUT = 1.2V

REVERSE OUTPUT CURRENT (

μA)

500

450

400

300

350

250

200

150

100

Input Ripple Rejection

Load Regulation

∆IL = 1mA to 500mA

FREQUENCY (Hz)

INPUT RIPPLE REJECTION (dB)

10 1k 10k 1M

3021 G14

100 100k

VIN = 1.5V + 50mVRMS RIPPLE

VOUT = 0.5V

IL = 500mA

COUT = 4.7μF

COUT = 22μF

TEMPERATURE (°C)

–50

INPUT RIPPLE REJECTION (dB)

100

3021 G15

250–25 50 75 125100

VIN = 1.5V + 0.5VP-P RIPPLE AT 120Hz

VOUT = 0.5V

IL = 500mA

TEMPERATURE (°C)

–50

LOAD REGULATION (mV)

2.5

2.0

1.5

0.5

1.0

–0.5

–1.0

–1.5

–2.0

–2.5

3021 G17

250–25 50 75 125100

VIN = 1.15V

VOUT = 0.5V

*LOAD REGULATION NUMBER REFERS

TO CHANGE IN THE 200mV REFERENCE

VOLTAGE

LT3021/LT3021-1.2/

LT3021-1.5/LT3021-1.8

Rev.D

For more information www.analog.com

TYPICAL PERFORMANCE CHARACTERISTICS

No-Load Recovery Threshold

Output Noise Spectral Density

RMS Output Noise vs Load

Current (10Hz to 100kHz)

Transient Response

OUTPUT OVERSHOOT (%)

OUTPUT SINK CURRENT (mA)

3021 G20

15105 20

FREQUENCY (Hz)

OUTPUT NOISE SPECTRAL DENSITY (

μV/√Hz)

0.1

0.01

1k 100k 1M100 10k

3021 G18

VOUT = 1.2V

IL = 500mA

COUT = 4.7μF

LOAD CURRENT (mA)

OUTPUT NOISE (μVRMS)

300

250

200

150

100

0.01 1 10 100

3021 G19

0.1

VOUT = 1.2V

COUT = 4.7μF

50μs/DIV

IOUT = 50mA TO 500mA

VIN = 1.5V

VOUT = 1.2V

COUT = 22μF

3021 G21

VOUT

50mV/DIV

IOUT

500mA/DIV

LT3021/LT3021-1.2/

LT3021-1.5/LT3021-1.8

Rev.D

For more information www.analog.com

PIN FUNCTIONS

OUT (Pins 3, 4/Pin 2): These pins supply power to the load.

Use a minimum output capacitor of 3.3µF to prevent oscil-

lations. 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.

SENSE (Pin 7/Pin 3, Fixed Voltage Device Only): This pin

is the sense point for the internal resistor divider. It should

be tied directly to the OUT pins for best results.

ADJ (Pin 7/Pin 3): 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 Tem-

perature in the Typical Performance Characteristics). The

ADJ pin reference voltage is 200mV (referred to GND).

AGND (Pin 8/Pin 4): Ground.

PGND (Pins 10, 17/Pin 6): Ground.

SHDN (Pin 9/Pin 5): The SHDN pin puts the LT3021 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 2.5µA. If unused, connect the SHDN

pin to VIN. The LT3021 does not function if the SHDN pin

is not connected.

IN (Pins 12, 14/Pin 8): These pins supply power to the

device. The LT3021 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-pow-

ered circuits. A bypass capacitor in the range of 3.3µF to

10µF sufﬁces. The L

T3021 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 LT3021 acts as if a diode is

in series with its input. No reverse current ﬂows into the

LT3021 and no reverse voltage appears at the load. The

device protects itself and the load.

EXPOSED PAD (Pin 17, DH16 Package Only): Ground.

Solder Pin 17 to the PCB ground. Connect directly to Pins

8, 10 for best performance.

NC (Pins 1, 2, 5, 6, 11, 13, 15, 16/Pins 1, 7): No Connect.

No connect pins may be ﬂoated, tied to IN or tied to GND.

(DH Package/S8 Package)

BLOCK DIAGRAM

(DH Package/S8 Package)

SHUTDOWN

–

CURRENT

GAIN

THERMAL

SHUTDOWN

3021 BD

ERROR AMP

NO-LOAD

RECOVERY

(12, 14/8)

OUT

(3,4/2)

OUT SENSE

(7/3)

NOTE:

FOR LT3021 ADJUST PIN (7/3) IS CONNECTED TO

THE ADJUST PIN, R1 AND R2 ARE EXTERNAL.

FOR LT3021-1.X PIN (7/3) IS CONNECTED TO THE

OUTPUT SENSE PIN, R1 AND R2 ARE INTERNAL.

GND

(8,10,17/4,6)

ADJ

(7/3)

SHDN

(9/5)

200mV

212mV

BIAS CURRENT

AND

REFERENCE

GENERATOR

FIXED

VOUT

1.2V

1.5V

1.8V

20k

100k

130k

160k

25k

LT3021/LT3021-1.2/

LT3021-1.5/LT3021-1.8

Rev.D

For more information www.analog.com

APPLICATIONS INFORMATION

The LT3021 is a very low dropout linear regulator capable

of 1V input supply operation. Devices supply 500mA of

output current and dropout voltage is typically 155mV.

Quiescent current is typically 110µA and drops to 3µA in

shutdown. The LT3021 incorporates several protection

features, making it ideal for use in battery-powered sys-

tems. 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 LT3021 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

start-up or normal operation.

Adjustable Operation

The LT3021’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 main-

tain the ADJ pin voltage at 200mV referenced to ground.

The current in R1 equals 200mV/R1 and the 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; (VOUT/200mV). For example, load regulation for

an output current change of 1mA to 500mA is typically

0.4mV at VADJ = 200mV. At VOUT = 1.5V, load regulation is:

(1.5V/200mV) • (0.4mV) = 3mV

Output Capacitance and Transient Response

The LT3021’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 ca-

pacitor of 3.3µF with an ESR of 0.2Ω or less to prevent

oscillations. The L

T3021 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 22µF a small feedforward capacitor with a

value of 300pF across the upper divider resistor (R2 in

Figure 1) is required. Under extremely low output current

conditions (ILOAD < 30µA) a low frequency small signal

oscillation (200Hz/8mVP-P at 1.2V output) can occur.

A minimum load of 100µA is recommended to prevent

this instability.

Give extra consideration to the use of ceramic capacitors.

Manufacturers make ceramic capacitors with a variety of

dielectrics, each with a different behavior across tempera-

ture 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 character-

isitics 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.

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 micro-

phone 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

Figure 1. Adjustable Operation

SHDN

3021 F01

OUT

VIN

ADJ

GND

LT3021

VOUT

VOUT = 200mV

VADJ = 200mV

IADJ = 20nA AT 25°C

OUTPUT RANGE = 0.2V TO 9.5V

1 + – IADJ (R2)

( )

LT3021/LT3021-1.2/

LT3021-1.5/LT3021-1.8

Rev.D

For more information www.analog.com

APPLICATIONS INFORMATION

amounts of noise. A ceramic capacitor produced Figure

4’s trace in response to light tapping from a pencil. Similar

vibration induced behavior can masquerade as increased

output voltage noise.

No-Load/Light-Load Recovery

A transient load step occurs when 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 VOUT) is the

only current 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 LT3021 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 cur-

rent 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 LT3021 turns the current sink off and shuts

down the bias current/reference generator circuitry.

Thermal Considerations

The LT3021’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: (IOUT)(VIN – VOUT) and

2. GND pin current multiplied by the input voltage:

(IGND)(VIN).

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.

Figure 2. Ceramic Capacitor DC Bias Characteristics

Figure 3. Ceramic Capacitor Temperature Characteristics

Figure 4. Noise Resulting from Tapping on a Ceramic Capacitor

DC BIAS VOLTAGE (V)

CHANGE IN VALUE (%)

3021 F02

–20

–40

–60

–80

–100 04810

2 6 12 14

X5R

Y5V

BOTH CAPACITORS ARE 16V,

1210 CASE SIZE, 10μF

TEMPERATURE (°C)

–50

–20

–40

–60

–80

–100

25 75

3021 F03

–25 0 50 100 125

Y5V

CHANGE IN VALUE (%)

X5R

BOTH CAPACITORS ARE 16V,

1210 CASE SIZE, 10μF

1ms/DIVVOUT = 1.3V

COUT = 10F

ILOAD = 0

3021 F04

1mV/DIV

LT3021/LT3021-1.2/

LT3021-1.5/LT3021-1.8

Rev.D

For more information www.analog.com

APPLICATIONS INFORMATION

The LT3021 regulator has internal thermal limiting (with

hysteresis) designed to protect the device during overload

conditions. For normal continuous conditions, do not ex-

ceed 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 LT3021.

The underside of the LT3021 DH package has exposed

metal (14mm2) 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 LT3021 also assist in spreading heat

to the PCB.

The LT3021 S8 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 through-

holes 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 DH Package

COPPER AREA

TOPSIDE* BACKSIDE

BOARD AREA

THERMAL RESISTANCE

(JUNCTION-TO-AMBIENT)

2500mm22500mm22500mm230°C/W

900mm22500mm22500mm235°C/W

225mm22500mm22500mm250°C/W

100mm22500mm22500mm255°C/W

50mm22500mm22500mm265°C/W

Table 2. Measured Thermal Resistance For S8 Package

COPPER AREA

TOPSIDE* BACKSIDE

BOARD AREA

THERMAL RESISTANCE

(JUNCTION-TO-AMBIENT)

2500mm22500mm22500mm270°C/W

1000mm22500mm22500mm270°C/W

225mm22500mm22500mm278°C/W

100mm22500mm22500mm284°C/W

50mm22500mm22500mm296°C/W

*Device is mounted on topside.

Calculating Junction Temperature

Example: Given an output voltage of 1.2V, an input voltage

range of 1.8V ±10%, an output current range of 1mA to

500mA, and a maximum ambient temperature of 70°C,

what will the maximum junction temperature be for an

application using the DH package?

The power dissipated by the device is equal to:

IOUT(MAX)(VIN(MAX) – VOUT) + IGND(VIN(MAX))

where

IOUT(MAX) = 500mA

VIN(MAX) = 1.98V

IGND at (IOUT = 500mA, VIN = 1.98V) = 10mA

P = 500mA(1.98V – 1.2V) + 10mA(1.98V) = 0.41W

The thermal resistance is in the range of 30°C/W to 65°C/W

depending on the copper area. So the junction temperature

rise above ambient is approximately equal to:

0.41W(47.5°C/W) = 19.5°C

The maximum junction temperature equals the maximum

junction temperature rise above ambient plus the maximum

ambient temperature or:

TJMAX = 19.5°C + 70°C = 89.5°C

Protection Features

The LT3021 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 reverse-

input voltages, reverse-output voltages and reverse out-

put-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 LT3021 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.

LT3021/LT3021-1.2/

LT3021-1.5/LT3021-1.8

Rev.D

For more information www.analog.com

APPLICATIONS INFORMATION

The LT3021 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 out-

put 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 LT3021 protects itself by thermal limiting. In this

case, grounding SHDN turns off the LT3021 and stops

OUT from sourcing current.

The LT3021 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 LT3021 attempts to source its current

limit capability at OUT. The output voltage increases to VIN

– VDROPOUT with VDROPOUT set by whatever load current

the LT3021 supports. This condition can potentially dam-

age external circuitry powered by the LT3021 if the output

voltage increases to an unregulated high voltage. If IN is

reference voltage, two situations can occur. If ADJ is pulled

slightly above its reference voltage, the LT3021 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 and the output voltage

clamps at a Schottky diode above ground. Please note that

the behavior described above applies to the LT3021 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 LT3021 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 LT3021 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 LT3021 is designed to be stable with a minimum

capacitance of 3.3µF 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 L

T3021 (and also from the ground of the

LT3021 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

LT3021 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 self-in-

ductance. 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

LT3021 between two parallel conductors and ﬂows in the

same direction in each. 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-induc-

tance to about one-ﬁfth of a single isolated wire.

LT3021/LT3021-1.2/

LT3021-1.5/LT3021-1.8

Rev.D

For more information www.analog.com

APPLICATIONS INFORMATION

If the LT3021 is powered by a battery mounted in close

proximity on the same circuit board, a 3.3µF input capacitor

is sufﬁcient for stability. However, if the LT3021 is powered

by a distant supply, use a larger value input capacitor fol-

lowing the guideline of roughly 1µF (in addition to the 3.3µF

minimum) per 8 inches of wire length. As power supply

output impedance may vary, the minimum input capaci-

tance 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 LT3021. Furthermore,

series resistance may be placed between the supply and

the input of the LT3021 to stabilize the application; as little

as 0.1Ω to 0.5Ω will sufﬁce.

PACKAGE DESCRIPTION

DH Package

16-Lead Plastic DFN (5mm × 5mm)

(Reference LTC DWG # 05-08-1709)

5.00 ±0.10

NOTE:

1. DRAWING PROPOSED TO BE MADE VARIATION OF VERSION (WJJD-1) IN JEDEC

PACKAGE OUTLINE MO-229

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 THE

TOP AND BOTTOM OF PACKAGE

0.40 ± 0.05

BOTTOM VIEW—EXPOSED PAD

3.45 ± 0.10

(2 SIDES)

0.75 ±0.05

R = 0.115

TYP

R = 0.20

TYP

4.10 ±0.10

(2 SIDES)

169

PIN 1

TOP MARK

(SEE NOTE 6)

0.200 REF

0.00 – 0.05

(DH16) DFN 0204

0.25 ± 0.05

PIN 1

NOTCH

0.50 BSC

4.10 ±0.05

(2 SIDES)

RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS

3.45 ±0.05

(2 SIDES)

4.10 ±0.05

0.50 BSC

0.70 ±0.05

5.50 ±0.05

PACKAGE

OUTLINE

0.25 ± 0.05

LT3021/LT3021-1.2/

LT3021-1.5/LT3021-1.8

Rev.D

For more information www.analog.com

PACKAGE DESCRIPTION

S8 Package

8-Lead Plastic Small Outline (Narrow .150 Inch)

(Reference LTC DWG # 05-08-1610)

.016 – .050

(0.406 – 1.270)

.010 – .020

(0.254 – 0.508)× 45°

0°– 8° TYP

.008 – .010

(0.203 – 0.254)

SO8 0303

.053 – .069

(1.346 – 1.752)

.014 – .019

(0.355 – 0.483)

TYP

.004 – .010

(0.101 – 0.254)

.050

(1.270)

BSC

1234

.150 – .157

(3.810 – 3.988)

NOTE 3

8765

.189 – .197

(4.801 – 5.004)

NOTE 3

.228 – .244

(5.791 – 6.197)

.245

MIN .160 ±.005

RECOMMENDED SOLDER PAD LAYOUT

.045 ±.005

.050 BSC

.030

±.005

TYP

INCHES

(MILLIMETERS)

NOTE:

1. DIMENSIONS IN

2. DRAWING NOT TO SCALE

3. THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.

MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .006" (0.15mm)

LT3021/LT3021-1.2/

LT3021-1.5/LT3021-1.8

Rev.D

For more information www.analog.com

REVISION HISTORY

REV DATE DESCRIPTION PAGE NUMBER

D 09/18 Change Load Regulation from 0mA to 1mA

Update Typical Dropout Voltage and Quiescent Current Values

Correct θJA in Pin Conﬁguration from 125°C/W to 70°C/W (S8 Package)

Revise Calculations in Calculating Junction Temperature Section

Update Related Parts Section

1,10

Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog

Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Speciﬁcations

subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices.

LT3021/LT3021-1.2/

LT3021-1.5/LT3021-1.8

Rev.D

For more information www.analog.com

RELATED PARTS

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Low Noise: < 40µVRMSP-P, “A” Version Stable with Ceramic Capacitors,

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Low Noise: <100µVRMSP-P, Stable with 1µF Output Capacitor,

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LT3020 100mA, Low Voltage LDO VIN: 0.9V to 10V, VOUT: 0.2V to 5V (min), VDO = 0.15V, IQ = 120µA,

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LTC3025 300mA, Low Voltage Micropower LDO VIN: 0.9V to 5.5V, VOUT: 0.4V to 3.6V (min), VDO = 0.05V, IQ = 54µA,

Stable with 1µF Ceramic Capacitors, DFN-6 Package

LTC3026 1.5A, Low Input Voltage VLDO Regulator VIN: 1.14V to 3.5V (Boost Enabled), 1.14V to 5.5V (with External 5V),

VDO = 0.1V, IQ = 950µA, Stable with 10µF Ceramic Capacitors,

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LT3033 3A, Low Voltage, VLDO Linear Regulator VIN: 0.9V to 10V, Dropout Voltage: 95mV Typical, Programmable Current

Limit, Current Monitor, Power Good, 3mm x 4mm QFN Package

LT3042 200mA, Ultralow Noise and Ultrahigh PSRR LDO 0.8µVRMS Noise and 79dB PSRR at 1MHz, VIN = 1.8V to 20V, 350mV Dropout

Voltage, Programmable Current Limit and Power Good, 3mm x 3mm DFN and

MSOP Packages

LT3045/ LT3045-1 500mA, Ultralow Noise and Ultrahigh PSRR LDO 0.8µVRMS Noise and 76dB PSRR at 1MHz, VIN = 1.8V to 20V, 260mV Dropout

Voltage, Programmable Current Limit and Power Good, 3mm x 3mm DFN and

MSOP Packages

 ANALOG DEVICES, INC. 2005–2018

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