LINEAR TECHNOLOGY LT3021, LT3021-1.2, LT3021-1.5, LT3021-1.8 Technical data

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FEATURES

■

VIN Range: 0.9V to 10V

■

Dropout Voltage: 160mV Typical

■

Output Current: 500mA

■

Adjustable Output (V

■

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

■

Stable with Low ESR, Ceramic Output Capacitors

REF

= V

OUT(MIN)

= 200mV)

(3.3µF Minimum)

■

0.2% Load Regulation from 0mA to 500mA

■

Quiescent Current: 120µA (Typ)

■

3µA Typical Quiescent Current in Shutdown

■

Current Limit Protection

■

Reverse-Battery Protection

■

No Reverse Current

■

Thermal Limiting with Hysteresis

■

16-Pin DFN (5mm × 5mm) and 8-Lead
SO Packages

U

APPLICATIO S

■

Low Current Regulators

■

Battery-Powered Systems

■

Cellular Phones

■

Pagers

■

Wireless Modems

LT3021/LT3021-1.2/

LT3021-1.5/LT3021-1.8

500mA, Low Voltage,

Very Low Dropout

Linear Regulator

U

DESCRIPTIO

The LT®3021 is a very low dropout voltage (VLDOTM) linear
regulator that operates from input supplies down to 0.9V.
This device supplies 500mA of output current with a
typical dropout voltage of 160mV. 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 pro­tection, 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 ex­posed pad and the 8-lead SO 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, 500mA VLDO Regulator

V

1.8V

IN

3.3µF

IN

LT3021-1.5

SHDN

OUT

SENSE

GND

3021 TA01

U

3.3µF

V

OUT

1.5V
500mA

Minimum Input Voltage

1.1
IL = 500mA

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

3021 TA02

3021fa

1

LT3021/LT3021-1.2/
LT3021-1.5/LT3021-1.8

WWWU

ABSOLUTE AXI U RATI GS

(Note 1)

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

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

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

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

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

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

UU

W

PACKAGE/ORDER I FOR ATIO

TOP VIEW

NC

1

NC

2

OUT

3

OUT

4

NC

5

NC

6

ADJ

7

AGND

8

16-LEAD (5mm × 5mm) PLASTIC DFN

T

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

JMAX

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

*SEE THE APPLICATIONS INFORMATION SECTION

**MEASURED JUNCTION TO PIN 17

17

LT3021-ADJ

DH PACKAGE

NC

16

NC

15

IN

14

NC

13

IN

12

NC

11

PGND

10

SHDN

9

NC

1

NC

2

OUT

3

OUT

4

NC

5

NC

6

SENSE

7

AGND

8

16-LEAD (5mm × 5mm) PLASTIC DFN

T

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

JMAX

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

*SEE THE APPLICATIONS INFORMATION SECTION

**MEASURED JUNCTION TO PIN 17

TOP VIEW

17

LT3021-FIXED

DH PACKAGE

Operating Junction Temperature Range

(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)..................300°C

ORDER PART

NC

16

NC

15

IN

14

NC

13

IN

12

NC

11

PGND

10

SHDN

9

NUMBER

LT3021EDH

ORDER PART

NUMBER

LT3021EDH-1.2
LT3021EDH-1.5
LT3021EDH-1.8

DH PART

MARKING

3021

DH PART

MARKING

302112
302115
302118

TOP VIEW

NC

1

OUT

2

ADJ

3

AGND

4

LT3021-ADJ

S8 PACKAGE

8-LEAD PLASTIC SO

T

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

JMAX

*SEE THE APPLICATIONS INFORMATION SECTION

**MEASURED JUNCTION TO PIN 6

8

IN

NC

7

PGND

6

SHDN

5

NC

OUT

SENSE

AGND

T

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

JMAX

*SEE THE APPLICATIONS INFORMATION SECTION

**MEASURED JUNCTION TO PIN 6

TOP VIEW

1

2

3

4

LT3021-FIXED

S8 PACKAGE

8-LEAD PLASTIC SO

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 factory for parts specified with wider operating temperature ranges.

ORDER PART

NUMBER

8

IN

NC

7

PGND

6

SHDN

5

LT3021ES8

ORDER PART

NUMBER

LT3021ES8-1.2
LT3021ES8-1.5
LT3021ES8-1.8

S8 PART

MARKING

3021

S8 PART

MARKING

302112
302115
302118

3021fa

2

LT3021/LT3021-1.2/

LT3021-1.5/LT3021-1.8

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 I
(Notes 5,14) I

ADJ Pin Voltage (Notes 4, 5) V

Regulated Output Voltage LT3021-1.2 V
(Note 4) 1.5V < V

Line Regulation (Note 6) LT3021 ∆V

Load Regulation (Note 6) LT3021 V

Dropout Voltage (Notes 7, 12) I

GND Pin Current I

= V

V

IN

OUT(NOMINAL)

+ 0.4V I

(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) LT3021 VIN – V

= 500mA, TJ > 0°C 0.9 1.05 V

LOAD

= 500mA, TJ < 0°C 0.9 1.10 V

LOAD

= 1.5V, I

IN

1.15V < V

LT3021-1.5 V

LT3021-1.8 V

LT3021-1.2 ∆V
LT3021-1.5 ∆V
LT3021-1.8 ∆V

LT3021-1.2 V
LT3021-1.5 V
LT3021-1.8 V

= 10mA 45 75 mV

LOAD

I

= 10mA

LOAD

I

= 500mA 155 190 mV

LOAD

I

= 500mA

LOAD

= 0mA

LOAD

= 10mA 920 µA

LOAD

= 100mA 2.25 mA

LOAD

I

= 500mA

LOAD

= 4.7µF, I

OUT

= 0.2V, V

ADJ

= Off to On

OUT

= On to Off

V

OUT

= 0V, V

SHDN

V

= 10V, V

SHDN

= 6V, V

IN

LT3021-1.2 VIN – V

LT3021-1.5 VIN – V

LT3021-1.8 VIN – V

= 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

IN
IN
IN
IN

= 1.15V, ∆I

IN

= 1.5V, ∆I

IN

= 1.8V, ∆I

IN

= 2.1V, ∆I

IN

= 500mA, BW = 10Hz to 100kHz, V

LOAD

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

IN

= 10V

IN

= 10V

IN

= 0V 3 9 µA

SHDN

I

LOAD

I

LOAD

I

LOAD

I

LOAD

< 500mA

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

= 1.15V to 10V, I
= 1.5V to 10V, I
= 1.8V to 10V, I
= 2.1V to 10V, I

= 1mA to 500mA –2 0.4 2 mV

LOAD

= 1mA to 500mA –6 1 6 mV

LOAD

= 1mA to 500mA –7.5 1.5 7.5 mV

LOAD

= 1mA to 500mA –9 2 9 mV

LOAD

= 1V, V

OUT

RIP

= 500mA

= 1V, V

OUT

RIPPLE

= 500mA

= 1V, V

OUT

RIPPLE

= 500mA

= 1V, V

OUT

RIPPLE

= 500mA

LOAD
LOAD
LOAD
LOAD

= 0.5V

LOAD

LOAD

LOAD

= 1mA
= 1mA
= 1mA
= 1mA

P-P

= 0.5V

= 0.5V

= 0.5V

< 500mA

< 500mA

< 500mA

OUT

, f

RIPPLE

, f

P-P

RIPPLE

, f

P-P

RIPPLE

, f

P-P

RIPPLE

●

193 200 206 mV

●

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

●

●

●

●

110 250 µA

6.20 10 mA

110 mV

285 mV

= 1.2V 300 µV

●

●

0.25 0.61 V

●

●

0.61 0.9 V

3 9.5 µA

= 120Hz, 70 dB

= 120Hz, 60 dB

= 120Hz, 58 dB

= 120Hz, 56 dB

±1 µA

RMS

3021fa

3

LT3021/LT3021-1.2/

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

LT3021-1.5/LT3021-1.8

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 LT3021 V

(Notes 11, 13) LT3021-1.2 V

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

Note 2: The LT3021 regulators are tested and specified under pulse load
conditions such that T

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

T

A

≈ TA. The LT3021 is 100% production tested at

J

characterization and correlation with statistical process controls.
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 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

= 0V 1.8 A

OUT

OUT(NOMINAL)

OUT

LT3021-1.5 V
LT3021-1.8 V

to 0.5V. The external

OUT

+ 0.5V, ∆V

OUT

= –5%

●

550 mA

= 0V 1 20 µA

OUT
OUT
OUT
OUT

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

= 0V 0.5 5 µA

IN

= 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)

+ 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 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 500mA
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

<

TYPICAL PERFOR A CE CHARACTERISTICS

Dropout Voltage Dropout Voltage

250

225

200

175

150

125

100

75

DROPOUT VOLTAGE (mV)

50

25

0

0

4

TJ = 125°C

TJ = 25°C

200100 300

OUTPUT CURRENT (mA)

400

UW

500

3021 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

Minimum Input Voltage

IL = 500mA

IL = 250mA

IL = 100mA

IL = 50mA

IL = 10mA

IL = 1mA

125100

3021 G02

3021fa

TEMPERATURE (°C)

–50

250

225

200

150

175

125

100

75

50

25

0

250–25 50 75

125100

QUIESCENT CURRENT (µA)

3021 G05

VIN = 6V
V

OUT

= 1.2V

I

L

= 0

V

SHDN

= V

IN

V

SHDN

= 0V

UW

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

I

LOAD

= 1mA

TYPICAL PERFOR A CE CHARACTERISTICS

LT3021/LT3021-1.2/

LT3021-1.5/LT3021-1.8

ADJ Pin Voltage

206

204

202

200

198

ADJ PIN VOLTAGE (mV)

196

194

–50

TEMPERATURE (°C)

Output Voltage

1.23
I

= 1mA

LOAD

1.22

1.21

1.20

1.19

OUTPUT VOLTAGE (V)

1.18

250–25 50 75

3021 G04

125100

OUTPUT VOLTAGE (V)

25

20

15

10

ADJ PIN BIAS CURRENT (nA)

5

0

–50

250–25 50 75

TEMPERATURE (°C)

Output Voltage

1.53
I

= 1mA

LOAD

1.52

1.51

1.50

1.49

1.48

Quiescent CurrentADJ Pin Bias Current

125100

3021 G11

Output Voltage

1.17

3.0

2.5

2.0

1.5

1.0

QUIESCENT CURRENT (mA)

0.5

–50

–25 0

TEMPERATURE (°C)

Quiescent Current

V

= 1.2V

OUT

= 0

I

L

= 25°C

T

J

V

= V

SHDN

IN

0

0

32158476
INPUT VOLTAGE (V)

50 100 125

25 75

V

= 0V

SHDN

3021 G28

3021 G03

1.47

–50

3.0

2.5

2.0

1.5

1.0

QUIESCENT CURRENT (mA)

0.5

109

0

50 100 125

–25 0

25 75

TEMPERATURE (°C)

Quiescent Current

V

= 1.5V

OUT

= 0

I

L

= 25°C

T

J

V

= V

SHDN

IN

V

2468

INPUT VOLTAGE (V)

SHDN

= 0V

3021 G23

3021 G26

10103579

Quiescent Current

3.0
V

= 1.8V

OUT

= 0

I

L

= 25°C

T

2.5

J

2.0

1.5

V

= V

SHDN

1.0

QUIESCENT CURRENT (mA)

0.5

0

2468

INPUT VOLTAGE (V)

IN

V

= 0V

SHDN

10103579

3021 G27

3021fa

5