LTC3025EDC-4#PBF datasheet, PDF

LTC3025-1/LTC3025-2/

LTC3025-3/LTC3025-4

500mA Micropower

VLDO Linear Regulators

FeaTures

n

DescripTion

The LTC

®

3025-X is a micropower, VLDO™ (very low drop-

out) linear regulator which operates from input voltages as

low as 0.9V. The device is capable of supplying 500mA of

output current with a typical dropout voltage of only 85mV.

A BIAS supply is required to run the internal reference and

LDO circuitry while output current comes directly from the

IN supply for high efficiency regulation. The LTC3025-1

features an adjustable output with a low 0.4V reference

while the LTC3025-2, LTC3025-3, and LTC3025-4 have

fixed 1.2V, 1.5V and 1.8V output voltages respectively.

The LTC3025-X’s low quiescent current makes it an ideal

choice for use in battery-powered systems. For 3-cell NiMH

and single cell Li-Ion applications, the BIAS voltage can

be supplied directly from the battery while the input can

come from a high efficiency buck regulator, providing a

high efficiency, low noise output.

Other features include high output voltage accuracy,

excellent transient response, stability with ultralow ESR

ceramic capacitors as small as 1µF short-circuit and

,

thermal overload protection and output current limiting.

The LTC3025-X is available in a tiny, low profile (0.75mm)

6-lead DFN (2mm × 2mm) package.

L,

LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and VLDO

and ThinSOT are trademarks of Linear Technology Corporation. All other trademarks are the

property of their respective owners. Protected by U.S. Patents including 7224204, 7218082.

n

Wide Input Voltage Range: 0.9V to 5.5V

Stable with Ceramic Capacitors

Very Low Dropout: 85mV at 500mA

Adjustable Output Range: 0.4V to 3.6V (LTC3025-1)

Fixed Output: 1.2V (LTC3025-2), 1.5V (LTC3025-3),

1.8V (LTC3025-4)

±2% Voltage Accuracy over Temperature,

Supply and Load

Low Noise: 80µV

RMS

(10Hz to 100kHz)

BIAS Voltage Range: 2.5V to 5.5V

Fast Transient Recovery

Shutdown Disconnects Load from V

IN

and V

BIAS

Low Operating Current: I

IN

= 4µA, I

BIAS

= 50µA Typ

Low Shutdown Current: I

IN

= 1µA, I

BIAS

= 0.01µA Typ

Output Current Limit

Thermal Overload Protection

Available in 6-Lead (2mm × 2mm) DFN Package

applicaTions

n

Low Power Handheld Devices

Low Voltage Logic Supplies

DSP Power Supplies

Cellular Phones

Portable Electronic Equipment

Handheld Medical Instruments

Post Regulator for Switching Supply Noise Rejection

Typical applicaTion

1.2V Output Voltage from 1.5V Input Supply

BIAS

Li-Ion

OR

3-CELL

NiMH

1.5V HIGH

EFFICIENCY 1.5V

DC/DC

BUCK

0.1µF

IN

0.1µF

OFF ON

SHDN

GND

30251234 TA01

1MHz V

IN

Supply Rejection

50

45

V

OUT

= 1.2V

I

OUT

≤ 500mA

REJECTION (dB)

C

OUT

= 10µF

C

OUT

= 1µF

OUT

1µF

40

35

30

25

20

15

10

5 BIAS = 3.6V

V

OUT

= 1.2V

0

1.2 1.4 1.6

I

OUT

= 100mA

I

OUT

= 300mA

1.8 2.0

V

IN

(V)

2.2

2.4

2.6

LTC3025-2

SENSE

30251234 TA01b

30251234ff

1

LTC3025-1/LTC3025-2/

LTC3025-3/LTC3025-4

absoluTe MaxiMuM raTings

(Notes 1, 2)

pin conFiguraTion

TOP VIEW

BIAS 1

GND 2

IN 3

7

6

SHDN

5 ADJ/SENSE*

4 OUT

V

BIAS

, V

IN

to GND......................................... –0.3V to 6V

SHDN

to GND............................................... –0.3V to 6V

SENSE, ADJ to GND ..................................... –0.3V to 6V

V

OUT

........................................–0.3V to V

IN

+ 0.3V or 6V

Operating Junction Temperature Range

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

Storage Temperature Range................... –65°C to 125°C

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

DC6 PACKAGE

6-LEAD (2mm

×

2mm) PLASTIC DFN

T

JMAX

= 125°C,

θ

JA

= 102°C/W,

θ

JC

= 20°C/W

EXPOSED PAD (PIN 7) IS GND, MUST BE SOLDERED TO PCB

*ADJ FOR LTC3025-1, SENSE FOR LTC3025-2, LTC3025-3, LTC3025-4

orDer inForMaTion

LEAD FREE FINISH

LTC3025EDC-1#PBF

LTC3025IDC-1#PBF

LTC3025EDC-2#PBF

LTC3025IDC-2#PBF

LTC3025EDC-3#PBF

LTC3025IDC-3#PBF

LTC3025EDC-4#PBF

LTC3025IDC-4#PBF

LEAD BASED FINISH

LTC3025EDC-1

LTC3025IDC-1

LTC3025EDC-2

LTC3025IDC-2

LTC3025EDC-3

LTC3025IDC-3

LTC3025EDC-4

LTC3025IDC-4

TAPE AND REEL

LTC3025EDC-1#TRPBF

LTC3025IDC-1#TRPBF

LTC3025EDC-2#TRPBF

LTC3025IDC-2#TRPBF

LTC3025EDC-3#TRPBF

LTC3025IDC-3#TRPBF

LTC3025EDC-4#TRPBF

LTC3025IDC-4#TRPBF

TAPE AND REEL

LTC3025EDC-1#TR

LTC3025IDC-1#TR

LTC3025EDC-2#TR

LTC3025IDC-2#TR

LTC3025EDC-3#TR

LTC3025IDC-3#TR

LTC3025EDC-4#TR

LTC3025IDC-4#TR

PART MARKING*

LDDW

LDMK

LDQS

LDPQ

PART MARKING*

LDDW

LDMK

LDQS

LDPQ

PACKAGE DESCRIPTION

6-Lead (2mm × 2mm) Plastic DFN

PACKAGE DESCRIPTION

6-Lead (2mm × 2mm) Plastic DFN

TEMPERATURE RANGE

–40°C to 125°C

TEMPERATURE RANGE

–40°C to 125°C

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

For more information on lead free part marking, go to:

http://www.linear.com/leadfree/

For more information on tape and reel specifications, go to:

http://www.linear.com/tapeandreel/

30251234ff

2

LTC3025-1/LTC3025-2/

LTC3025-3/LTC3025-4

elecTrical characTerisTics

PARAMETER

V

IN

Operating Voltage (Note 4)

CONDITIONS

LTC3025-1

LTC3025-2

LTC3025-3

LTC3025-4

V

BIAS

Operating Voltage (Note 4)

LTC3025-1

LTC3025-2

LTC3025-3

LTC3025-4

V

BIAS

Undervoltage Lockout

V

IN

Operating Current

V

IN

Operating Current

V

BIAS

Operating Current

V

BIAS

Operating Current

V

IN

Shutdown Current

V

BIAS

Shutdown Current

V

ADJ

Regulation Voltage (Note 5)

V

SENSE

Regulation Voltage (Note 5)

V

SENSE

Regulation Voltage (Note 5)

V

SENSE

Regulation Voltage (Note 5)

I

ADJ

ADJ Input Current

I

OUT

= 10µA, V

OUT

= 1.2V, LTC3025-1

I

OUT

= 0µA, LTC3025-2/LTC3025-3/LTC3025-4

I

OUT

= 10µA, V

OUT

= 1.2V, LTC3025-1

I

OUT

= 0µA, LTC3025-2/LTC3025-3/LTC3025-4

V

SHDN

= 0V

V

SHDN

= 0V

1mA ≤ I

OUT

≤ 500mA, V

OUT

= 1.2V, 1.5V ≤ V

IN

≤ 5V, LTC3025-1

1mA ≤ I

OUT

≤ 500mA, V

OUT

= 1.2V, 1.5V ≤ V

IN

≤ 5V, LTC3025-1

1mA ≤ I

OUT

≤ 500mA, 1.5V ≤ V

IN

≤ 5V, LTC3025-2

1mA ≤ I

OUT

≤ 500mA, 1.5V ≤ V

IN

≤ 5V, LTC3025-2

1mA ≤ I

OUT

≤ 500mA, 1.7V ≤ V

IN

≤ 5V, LTC3025-3

1mA ≤ I

OUT

≤ 500mA, 1.7V ≤ V

IN

≤ 5V, LTC3025-3

1mA ≤ I

OUT

≤ 500mA, 2.0V ≤ V

IN

≤ 5V, LTC3025-4

1mA ≤ I

OUT

≤ 500mA, 2.0V ≤ V

IN

≤ 5V, LTC3025-4

V

ADJ

= 0.45V, LTC3025-1

l

The

l

denotes the specifications which apply over the full operating

temperature range, otherwise specifications are at T

A

= 25°C. V

IN

= 1.5V, V

BIAS

= 3.6V, C

OUT

= 1µF C

IN

= 0.1µF C

BIAS

= 0.1µF

,

(all capacitors ceramic) unless otherwise noted. (Note 3)

MIN

0.9

1.4

1.7

2.0

2.5

2.7

3.0

3.3

2.2

4

50

1

0.01

0.395

0.392

1.185

1.176

1.481

1.470

1.777

1.764

–50

0.4

1.2

1.5

1.8

0

–0.35

–1

–1.3

–1.5

0.07

0.21

0.26

0.32

l

TYP

MAX

5.5

2.5

10

80

5

1

0.405

0.408

1.215

1.224

1.519

1.530

1.823

1.836

50

UNITS

V

µA

V

nA

mV

OUT Load Regulation (Referred to ADJ Pin) ∆I

OUT

= 1mA to 500mA, LTC3025-1

OUT Load Regulation

∆I

OUT

= 1mA to 500mA, LTC3025-2

∆I

OUT

= 1mA to 500mA, LTC3025-3

∆I

OUT

= 1mA to 500mA, LTC3025-4

V

IN

Line Regulation (Referred to ADJ Pin)

V

IN

Line Regulation

V

BIAS

Line Regulation

V

BIAS

Line Regulation

V

IN

to V

OUT

Dropout Voltage (Notes 4, 6)

V

IN

to V

OUT

Dropout Voltage (Notes 4, 6)

V

IN

to V

OUT

Dropout Voltage (Notes 4, 6)

V

BIAS

to V

OUT

Dropout Voltage (Note 4)

V

IN

= 1.5V to 5V, V

BIAS

= 3.6V, V

OUT

= 1.2V,

I

OUT

= 1mA, LTC3025-1

V

IN

= 1.5V to 5V, V

BIAS

= 3.6V, I

OUT

= 1mA, LTC3025-2

V

IN

= 1.8V to 5V, V

BIAS

= 3.6V, I

OUT

= 1mA, LTC3025-3

V

IN

= 2.1V to 5V, V

BIAS

= 3.6V, I

OUT

= 1mA, LTC3025-4

V

IN

= 1.5V, V

BIAS

= 2.7V to 5V, V

OUT

= 1.2V, I

OUT

= 1mA,

LTC3025-1

V

IN

= 1.5V, V

BIAS

= 2.7V to 5V, I

OUT

= 1mA, LTC3025-2

V

IN

= 1.8V, V

BIAS

= 3.0V to 5V, I

OUT

= 1mA, LTC3025-3

V

IN

= 2.1V, V

BIAS

= 3.3V to 5V, I

OUT

= 1mA, LTC3025-4

V

BIAS

= 3V, V

IN

= 1.5V, I

OUT

= 500mA,

V

ADJ

= 0.37V(LTC3025-1), V

SENSE

= 1.15V(LTC3025-2)

V

BIAS

= 3.1V, V

IN

= 1.7V, I

OUT

= 500mA,

V

SENSE

= 1.45V(LTC3025-3)

V

BIAS

= 3.4V, V

IN

= 2.0V, I

OUT

= 500mA,

V

SENSE

= 1.75V(LTC3025-4)

LTC3025-1

4.5

85

90

16.5

120

170

130

185

130

185

1.5

mV

V

30251234ff

l

90

l

3

LTC3025-1/LTC3025-2/

LTC3025-3/LTC3025-4

The

l

denotes the specifications which apply over the full operating

temperature range, otherwise specifications are at T

A

= 25°C. V

IN

= 1.5V, V

BIAS

= 3.6V, C

OUT

= 1µF C

IN

= 0.1µF C

BIAS

= 0.1µF

,

(all capacitors ceramic) unless otherwise noted. (Note 3)

PARAMETER

I

OUT

Continuous Output Current

I

OUT

Current Limit

e

n

Output Voltage Noise

V

IH

SHDN

Input High Voltage

V

IL

SHDN

Input Low Voltage

I

IH

SHDN

Input High Current

I

L

SHDN

Input Low Current

SHDN

= 1.2V

SHDN

= 0V

V

ADJ

= 0V(LTC3025-1),

V

SENSE

= 0V(LTC3025-2/LTC3025-3/LTC3025-4)

f = 10Hz to 100kHz, I

OUT

= 300mA

l

elecTrical characTerisTics

CONDITIONS

MIN

l

TYP

1130

80

MAX

UNITS

mA

µV

RMS

V

500

0.9

0.3

–1

1

V

µA

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:

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 3:

The LTC3025-X regulators are tested and specified under pulse

load conditions such that T

J

≈ T

A

. The LTC3025E-X are guaranteed to

meet performance specifications from 0°C and 125°C. Specifications over

the –40°C to 125°C operating junction temperature range are assured by

design, characterization and correlation with statistical process controls.

The LTC3025I-X are guaranteed to meet performance specifications over

the full –40°C to 125°C operating junction temperature range.

Note 4:

For the LTC3025-1, a regulated output voltage will only be available

when the minimum IN and BIAS operating voltages as well as the IN to

OUT and BIAS to OUT dropout voltages are all satisfied. For the

LTC3025-2/LTC3025-3/LTC3025-4 the minimum IN operating voltage

assumes I

OUT

= 500mA. For correct regulation at I

OUT

< 500mA the

minimum IN operating voltage decreases to the maximum V

SENSE

Regulation Voltage as I

OUT

decreases to 0mA (i.e. V

INMIN

= 1.312V at I

OUT

= 250mA for the LTC3025-2).

Note 5:

Operating conditions are limited by maximum junction

temperature. The regulated output voltage specification will not apply

for all possible combinations of input voltage and output current. When

operating at maximum input voltage, the output current range must be

limited. When operating at maximum output current, the input voltage

range must be limited.

Note 6:

Dropout voltage is minimum input to output voltage differential

needed to maintain regulation at a specified output current. In dropout, the

output voltage will be equal to V

IN

– V

DROPOUT

.

30251234ff

4

LTC3025-1/LTC3025-2/

LTC3025-3/LTC3025-4

Typical perForMance characTerisTics

V

IN

to V

OUT

Dropout Voltage

vs I

OUT

120

100

DROPOUT VOLTAGE (mV)

80

60

40

20

0

T

A

= –40°C

V

BIAS

= 2.8V

V

IN

= 1.4V

T

A

= 125°C

T

A

= 25°C

I

BIAS

(µA)

500

450

400

350

125°C

25°C

–40°C

I

BIAS

(µA)

300

250

200

150

100

50

0

50 100 150 200 250 300 350 400 450 500

I

OUT

(mA)

30251234 G01

(T

A

= 25°C unless otherwise noted)

Operating BIAS Current

vs Output Current

80

BIAS No Load Operating Current

V

IN

= 1.5V

V

OUT

= 1.2V

70

60

50

40

30

20

10

125°C

–40°C

25°C

0

0.01

0.1

1

10

I

OUT

(mA)

100

1000

0

2.5

3

3.5

4.5

4

V

BIAS

(V)

5

5.5

30251234 G02

30251234 G03

V

IN

No Load Operating Current

14

12

10

I

IN

(µA)

8

6

4

2

0

0.5

1.5

2.5

3.5

4.5

5.5

V

BIAS

= 5V

V

OUT

= 0.8V

7

6

125°C

85°C

25°C

–40°C

I

IN

(µA)

5

4

3

2

1

V

IN

Shutdown Current

V

BIAS

= 5V

405

404

403

ADJUST VOLTAGE (mV)

402

401

400

399

398

397

396

1.5

2.5

3.5

4.5

5.5

–40°C

Adjust Voltage vs Temperature

V

BIAS

= 3.6V

V

IN

= 1.5V

I

OUT

= 10µA

25°C

85°C

0

0.5

395

–50

–25

V

IN

(V)

30251234 G04

V

IN

(V)

30251234 G05

50

25

0

75

TEMPERATURE (°C)

100

125

30251234 G06

SHDN

Threshold vs Temperature

1000

900

800

SHDN

THRESHOLD (mV)

700

600

500

400

300

200

100

0

–50

–25

50

25

0

75

TEMPERATURE (°C)

100

125

V

BIAS

= 2.5V

V

BIAS

= 5V

CURRENT LIMIT (mA)

1600

1400

1200

1000

800

600

400

200

0

Current Limit vs V

IN

Voltage

V

IN

AC

100mV/DIV

Burst Mode DC/DC Buck Ripple

Rejection

V

OUT

AC

10mV/DIV

0

1

2

3

V

IN

(V)

4

5

6

V

IN

= 1.8V

V

OUT

= 1.5V

C

OUT

= 1µF

I

OUT

= 50mA

10µs/DIV

30251234 G09

30251234 G07

30251234 G08

30251234ff

5

Parameter Name	Attribute value
EU restricts the use of certain hazardous substances	Compliant
ECCN (US)	EAR99
Part Status	Unconfirmed
Type	LDO
Number of Outputs	1
Polarity	Positive
Accuracy (%)	±2
Output Type	Fixed
Output Voltage (V)	1.8
Maximum Output Current (A)	0.5(Typ)
Minimum Input Voltage (V)	2
Maximum Input Voltage (V)	5.5
Maximum Dropout Voltage @ Current (V)	0.13@500mA
Line Regulation	0.32mV(Typ)
Load Regulation	-1.5mV(Typ)
Junction to Ambient	102°C/W
Junction to Case	20°C/W
Special Features	Thermal Protection\|Shutdown\|Short Circuit Protection\|Current Limit
Minimum Operating Temperature (°C)	-40
Maximum Operating Temperature (°C)	125
Supplier Temperature Grade	Extended
Packaging	Tape and Reel
Supplier Package	DFN EP
Pin Count	6
Standard Package Name	DFN
Mounting	Surface Mount
Package Height	0.75(Max)
Package Length	2
Package Width	2
PCB changed	6
Lead Shape	No Lead

LTC3025EDC-4#PBF

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