FEATURES

n

LTC3025-1/LTC3025-2/

LTC3025-3/LTC3025-4

500mA Micropower

VLDO Linear Regulators

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 and LTM 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.

Protected by U.S. Patents including 7224204, 7218082.

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

50

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

1μF

V

OUT

= 1.2V

I

OUT

≤ 500mA

45

40

REJECTION (dB)

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

30251234fc

30251234 TA01b

OUT

C

OUT

= 10μF

LTC3025-2

SENSE

C

OUT

= 1μF

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

6-Lead (2mm

×

2mm) Plastic DFN

6-Lead (2mm

×

2mm) Plastic DFN

6-Lead (2mm

×

2mm) Plastic DFN

6-Lead (2mm

×

2mm) Plastic DFN

6-Lead (2mm

×

2mm) Plastic DFN

6-Lead (2mm

×

2mm) Plastic DFN

6-Lead (2mm

×

2mm) Plastic DFN

PACKAGE DESCRIPTION

6-Lead (2mm

×

2mm) Plastic DFN

6-Lead (2mm

×

2mm) Plastic DFN

6-Lead (2mm

×

2mm) Plastic DFN

6-Lead (2mm

×

2mm) Plastic DFN

6-Lead (2mm

×

2mm) Plastic DFN

6-Lead (2mm

×

2mm) Plastic DFN

6-Lead (2mm

×

2mm) Plastic DFN

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/

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.

PARAMETER

V

IN

Operating Voltage (Note 4)

CONDITIONS

LTC3025-1

LTC3025-2

LTC3025-3

LTC3025-4

l

ELECTRICAL CHARACTERISTICS

MIN

0.9

1.4

1.7

2.0

TYP

MAX

5.5

UNITS

V

30251234fc

2

LTC3025-1/LTC3025-2/

LTC3025-3/LTC3025-4

ELECTRICAL CHARACTERISTICS

PARAMETER

V

BIAS

Operating Voltage (Note 4)

CONDITIONS

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

OUT Load Regulation

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

ΔI

OUT

= 1mA to 500mA, LTC3025-2

ΔI

OUT

= 1mA to 500mA, LTC3025-3

ΔI

OUT

= 1mA to 500mA, LTC3025-4

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

= 2.8V, 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

V

ADJ

= 0V(LTC3025-1),

V

SENSE

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

f = 10Hz to 100kHz, I

OUT

= 300mA

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.

MIN

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

4.5

85

90

16.5

120

170

130

185

130

185

1.5

500

1130

80

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

V

mA

μV

RMS

30251234fc

OUT Load Regulation (Referred to ADJ Pin)

ΔI

OUT

= 1mA to 500mA, LTC3025-1

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)

I

OUT

Continuous Output Current

I

OUT

Current Limit

e

n

Output Voltage Noise

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.

PARAMETER

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

CONDITIONS

l

ELECTRICAL CHARACTERISTICS

MIN

0.9

TYP

MAX

0.3

UNITS

V

μA

–1

1

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

.

TYPICAL PERFORMANCE CHARACTERISTICS

V

IN

to V

OUT

Dropout Voltage

vs I

OUT

120

100

DROPOUT VOLTAGE (mV)

80

60

40

20

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

500

450

80

BIAS No Load Operating Current

V

IN

= 1.5V

V

OUT

= 1.2V

70

60

I

BIAS

(μA)

50

40

30

20

10

125°C

–40°C

25°C

V

BIAS

= 2.8V

V

IN

= 1.4V

T

A

= 125°C

T

A

= 25°C

I

BIAS

(μA)

400

350

300

250

200

150

100

50

0

0.01

0.1

1

10

I

OUT

(mA)

100

1000

25°C

125°C

–40°C

T

A

= –40°C

0

2.5

3

3.5

4

V

BIAS

(V)

4.5

5

5.5

30251234 G02

30251234 G03

30251234fc

4

LTC3025-1/LTC3025-2/

LTC3025-3/LTC3025-4

TYPICAL PERFORMANCE CHARACTERISTICS

V

IN

No Load Operating Current

14

12

10

I

IN

(μA)

8

6

4

2

0

0.5

V

BIAS

= 5V

V

OUT

= 0.8V

7

6

125°C

85°C

25°C

–40°C

2

85°C

1

0

0.5

I

IN

(μA)

5

4

3

25°C

–40°C

ADJUST VOLTAGE (mV)

(T

A

= 25°C unless otherwise noted)

V

IN

Shutdown Current

405

V

BIAS

= 5V

404

403

402

401

400

399

398

397

396

1.5

2.5

3.5

4.5

5.5

Adjust Voltage vs Temperature

V

BIAS

= 3.6V

V

IN

= 1.5V

I

OUT

= 10μA

1.5

2.5

3.5

4.5

5.5

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

200

0

V

BIAS

= 2.5V

V

BIAS

= 5V

CURRENT LIMIT (mA)

1600

1400

1200

1000

800

600

400

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

V

IN

Ripple Rejection

vs Frequency

70

60

50

REJECTION (dB)

40

C

OUT

= 1μF

30

20

10

C

OUT

= 10μF

70

60

50

40

30

BIAS Ripple Rejection

vs Frequency

50

45

C

OUT

= 10μF

REJECTION (dB)

40

35

30

25

20

15

10

3MHz V

IN

Supply Rejection

C

OUT

= 10μF

C

OUT

= 1μF

REJECTION (dB)

C

OUT

= 1μF

20

10

V

BIAS

= 3.6V

V

IN

= 1.5V

V

OUT

= 1.2V

I

OUT

= 100mA

1k

10k

100k

1M

10M

FREQUENCY (Hz)

0

100

V

BIAS

= 3.6V

V

IN

= 1.5V

V

OUT

= 1.2V

I

OUT

= 100mA

1k

10k

100k

1M

10M

FREQUENCY (Hz)

30251234 G10

0

100

5 V

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

30251234 G11

30251234 G12

30251234fc

5

参数名称	属性值
是否无铅	含铅
是否Rohs认证	不符合
零件包装代码	SON
包装说明	HVSON, SOLCC6,.08,20
针数	6
Reach Compliance Code	_compli
ECCN代码	EAR99
可调性	FIXED
最大回动电压 1	0.185 V
标称回动电压 1	0.09 V
最大绝对输入电压	6 V
最大输入电压	5.5 V
最小输入电压	1.7 V
JESD-30 代码	S-PDSO-N6
JESD-609代码	e0
长度	2 mm
湿度敏感等级	1
功能数量	1
输出次数	1
端子数量	6
工作温度TJ-Max	125 °C
工作温度TJ-Mi
最大输出电流 1	0.5 A
最大输出电压 1	1.53 V
最小输出电压 1	1.47 V
标称输出电压 1	1.5 V
封装主体材料	PLASTIC/EPOXY
封装代码	HVSON
封装等效代码	SOLCC6,.08,20
封装形状	SQUARE
封装形式	SMALL OUTLINE, HEAT SINK/SLUG, VERY THIN PROFILE
峰值回流温度（摄氏度）	235
认证状态	Not Qualified
调节器类型	FIXED POSITIVE SINGLE OUTPUT LDO REGULATOR
座面最大高度	0.8 mm
表面贴装	YES
技术	CMOS
端子面层	Tin/Lead (Sn/Pb)
端子形式	NO LEAD
端子节距	0.5 mm
端子位置	DUAL
处于峰值回流温度下的最长时间	20
最大电压容差	2%
宽度	2 mm
Base Number Matches	1

LTC3025EDC-3

LTC3025EDC-3概述

LTC3025EDC-3规格参数

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