LTC4070EDDBPBF,LTC4070EDDBPBF pdf中文资料,LTC4070EDDBPBF引脚图,LTC4070EDDBPBF电路-Datasheet-电子工程世界

LTC4070

Li-Ion/Polymer Shunt

Battery Charger System

FEATURES

n

DESCRIPTION

The LTC

®

4070 allows simple charging of Li-Ion/Polymer

batteries from very low current, intermittent or continuous

charging sources. The 450nA to 50mA operating cur-

rent makes charging possible from previously unusable

sources. With the addition of an external pass device,

shunt current may be boosted to 500mA. Stacked cell high

voltage battery packs are inherently balanced with shunt

charging. With its low operating current, the LTC4070 is

well suited to charge thin film batteries in energy harvesting

applications where charging sources may be intermittent

or very low power. The unique architecture of the LTC4070

allows for an extremely simple battery charger solution;

requiring just one external resistor.

The LTC4070 offers a pin selectable float voltage with 1%

accuracy across the full range of operating temperature

and shunt current. The integrated thermal battery quali-

fier extends battery lifetime and improves reliability by

automatically reducing the battery float voltage at NTC

thermistor temperatures above 40°C. The LTC4070 also

provides both low and high battery status outputs. With

the addition of an external PFET, the low-battery output

pin can implement a latch-off function that automatically

disconnects the system load from the battery to protect

the battery from deep discharge.

The device is offered in two thermally enhanced packages,

a compact low profile (0.75mm) 8-lead (2mm

×

3mm)

DFN and an 8-lead MSOP package.

Low Operating Current (450nA)

1% Float Voltage Accuracy Over Full Temperature

and Shunt Current Range

50mA Maximum Internal Shunt Current

(500mA with External PFET)

Pin Selectable Float Voltage Options:

4.0V, 4.1V, 4.2V

Ultralow Power Pulsed NTC Float Conditioning for

Li-Ion/Polymer Protection

Suitable for Intermittent, Continuous and Very Low

Power Charging Sources

Low and High Battery Status Outputs

Simple Low Voltage Load Disconnect Application

Thermally Enhanced, Low Profile (0.75mm)

8-Lead (2mm

×

3mm) DFN and MSOP Packages

Low Power Li-Ion/Polymer Battery Back-Up

Solar Power Systems with Back-Up

Memory Back-Up

Embedded Automotive

Thin Film Batteries

Energy Scavenging/Harvesting

APPLICATIONS

n

L,

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

Technology Corporation. All other trademarks are the property of their respective owners..

TYPICAL APPLICATION

V

IN

R

IN

NTC Overtemperature Battery Float Voltage Qualifying

4.3

4.2

Q1:FDR8508

V

F

(V)

4.1

4.0

3.9

3.8

Li-Ion

3.7

0

Simple Shunt Charger with Load

Disconnect and NTC Conditioning

ADJ = V

CC

ADJ = FLOAT

ADJ = GND

V

CC

ADJ

LBO

NTCBIAS

10k

NTC

LTC4070

GND

T

+

20

NTHS0805E3103LT

40

60

TEMPERATURE (°C)

80

100

4070 TA01b

4070 TA01a

4070f

1

LTC4070

ABSOLUTE MAXIMUM RATINGS

(Notes 1, 2)

I

CC

....................................................................... ±60mA

ADJ, NTC, NTCBIAS, DRV, LBO, HBO

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

CC

+ 0.3V

Operating Junction Temperature Range.. –40°C to 125°C

Maximum Junction Temperature ......................... 125°C

Storage Temperature Range .................. –65°C to 150°C

Peak Reflow Temperature ..................................... 260°C

PIN CONFIGURATION

TOP VIEW

NTCBIAS 1

NTC 2

ADJ 3

HBO 4

9

8

7

6

5

V

CC

DRV

LBO

GND

NTCBIAS

NTC

ADJ

HBO

1

2

3

4

8

7

6

5

V

CC

DRV

LBO

GND

9

MS8E PACKAGE

8-LEAD PLASTIC MSOP

DDB PACKAGE

8-LEAD (3mm 2mm) PLASTIC DFN

T

JMAX

= 125°C,

θ

JA

= 76°C/W

EXPOSED PAD (PIN 9) IS NOT INTERNALLY CONNECTED,

MUST BE SOLDERED TO PCB, GND TO OBTAIN

θ

JA

T

JMAX

= 125°C,

θ

JA

= 40°C/W

EXPOSED PAD (PIN 9) IS NOT INTERNALLY CONNECTED,

MUST BE SOLDERED TO PCB, GND TO OBTAIN

θ

JA

ORDER INFORMATION

LEAD FREE FINISH

LTC4070EDDB#PBF

LTC4070IDDB#PBF

LTC4070EMS8E#PBF

LTC4070IMS8E#PBF

TAPE AND REEL

LTC4070EDDB#TRPBF

LTC4070IDDB#TRPBF

LTC4070EMS8E#TRPBF

LTC4070IMS8E#TRPBF

PART MARKING*

LFPD

LTFMT

PACKAGE DESCRIPTION

8-Lead (3mm

×

2mm) Plastic DFN

8-Lead (3mm

×

2mm) Plastic DFN

8-Lead Plastic MSOP

TEMPERATURE RANGE

–40°C to 85°C

–40°C to 125°C

–40°C to 85°C

–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.

Consult LTC Marketing for information on non-standard lead based finish parts.

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

junction temperature range. V

NTC

= V

CC

, T

J

= 25°C unless otherwise specified. Current into a pin is positive and current out of a pin is

negative. All voltages are referenced to GND unless otherwise noted. (Note 2)

SYMBOL

V

FLOAT

PARAMETER

Programmable Float Voltage

10μA ≤ I

CC

≤ 50mA

Maximum Shunt Current

V

CC

Operating Current

Low Bat V

CC

Operating Current

CONDITIONS

V

ADJ

= 0V

V

ADJ

= Float

V

ADJ

= V

CC

V

CC

> V

FLOAT

V

HBO

Low

V

CC

= 3.1V

l

ELECTRICAL CHARACTERISTICS

MIN

3.96

4.06

4.16

50

TYP

4.0

4.1

4.2

450

300

MAX

4.04

4.14

4.24

1040

UNITS

V

mA

nA

4070f

I

CCMAX

I

CCQ

I

CCQLB

2

LTC4070

ELECTRICAL CHARACTERISTICS

SYMBOL

V

HBTH

V

HBHY

V

LBTH

V

LBHY

V

OL

V

OH

PARAMETER

HBO Threshold (V

FLOAT

– V

CC

)

Hysteresis

LBO Threshold

Hysteresis

CMOS Output Low

CMOS Output High

I

SINK

= 1mA, V

CC

= 3.7V

V

LBO

: V

CC

= 3.1V, I

SOURCE

= –100μA

V

HBO

: I

CC

= 1.5mA, I

SOURCE

= –500μA

Input Logic Low Level

Input Logic High Level

I

ADJ(Z)

NTC

I

NTC

I

NTCBIAS

ΔV

FLOAT(NTC)

NTC Leakage Current

Average NTCBIAS Sink Current

Delta Float Voltage per NTC Comparator

Step

0V< NTC < V

CC

Pulsed Duty Cycle < 0.002%

I

CC

= 1mA, NTC Falling Below One of the

NTC

TH

Thresholds

ADJ = 0V

ADJ = Float

ADJ = V

CC

V

NTC

as % of V

NTCBIAS

Amplitude

35.5

28.0

21.8

16.8

Hysteresis

DRV Output Source Current

DRV Output Sink Current

V

CC

= 3.1V, V

DRV

= 0V

I

CC

= 1mA, R

DRV

= 475k (Note 3)

–50

0

30

50

nA

pA

Allowable ADJ Leakage Current in

Floating State

l

The

l

denotes the specifications which apply over the full operating

junction temperature range. V

NTC

= V

CC

, T

J

= 25°C unless otherwise specified. Current into a pin is positive and current out of a pin is

negative. All voltages are referenced to GND unless otherwise noted. (Note 2)

CONDITIONS

V

CC

Rising

l

MIN

15

TYP

40

100

MAX

60

UNITS

mV

High Battery Status

Low Battery Status

V

CC

Falling

l

3.08

220

3.2

290

3.34

350

0.5

V

mV

V

Status Outputs HBO/LBO

V

CC

– 0.6

3-State Selection Input: ADJ

V

ADJ

ADJ Input Level

l

0.3

V

CC

– 0.3

±3

V

μA

–50

–75

–100

36.5

29.0

22.8

17.8

30

–1

3

37.5

30.0

23.8

18.8

mV

%

mV

mA

μA

NTC

TH1

NTC

TH2

NTC

TH3

NTC

TH4

NTC

HY

Drive Output

I

DRV(SOURCE)

I

DRV(SINK)

NTC Comparator Falling Thresholds

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 LTC4070E is guaranteed to meet performance specifications

for junction temperatures from 0°C to 85°C. Specifications over the –40°C

to 85°C operating junction temperature range are assured by design,

characterization and correlation with statistical process controls. The

LTC4070I is guaranteed over the full –40°C to 125°C operating junction

temperature range. Note that the maximum ambient temperature is

determined by specific operating conditions in conjunction with board

layout, the rated package thermal resistance and other environmental

factors.

Note 3:

The I

DRV(SNK)

current is tested by pulling the DRV pin up to V

CC

through a 475k resistor, R

DRV

. Pulling the DRV pin up to V

CC

with low

impedance disables the regulator.

4070f

3

LTC4070

TYPICAL PERFORMANCE CHARACTERISTICS

Battery Discharge I

CC

vs V

CC

1000

900

800

700

V

FLOAT

(mV)

I

CC

(nA)

600

500

400

300

200

100

0

T

A

= 25°C, unless otherwise noted.

Load Regulation

ΔV

FLOAT

vs I

CC

10

9

8

7

V

FLOAT

(V)

6

5

4

3

4.15

4.10

4.05

4.00

3.95

0

V

FLOAT

vs Temperature, I

CC

= 1mA

4.30

4.25

4.20

ADJ = V

CC

NO NTC

ADJ = GND

ADJ = FLOAT

FALLING

RISING

ADJ = GND

2

1

2

V

CC

(V)

3

4

4070 G01

0

10

20

30

40

I

CC

(mA)

50

60

4070 G02

3.90

–50

–25

0

25

50

75

TEMPERATURE (°C)

100

125

4070 G03

I

CCQ

vs Temperature (ADJ = V

CC

)

1000

900

800

700

I

CCQ

(nA)

600

500

400

300

200

100

0

–50

–25

0

25

50

75

TEMPERATURE (°C)

100

125

V

HBTH

(mV)

100

90

80

70

60

50

40

30

20

10

V

HBTH

V

CC

Rising vs Temperature

(ADJ = V

CC

)

300

250

200

V

HBHY

(mV)

150

100

50

V

HBHY

vs Temperature

(ADJ = V

CC

)

0

–50

–25

0

25

50

75

TEMPERATURE (°C)

100

125

0

–50

–25

0

25

50

75

TEMPERATURE (°C)

100

125

4070 G04

4070 G05

4070 G06

V

FLOAT

vs NTC Temperature,

I

CC

= 1mA

4.3

4.2

4.1

V

FLOAT

(V)

4.0

3.9

3.8

3.7

0

V

LBTH

V

CC

Falling vs Temperature

3.250

320

300

280

V

LBHY

(V)

260

3.245

3.240

ADJ = FLOAT

V

LBHY

vs Temperature

ADJ = V

CC

ADJ = V

CC

ADJ = FLOAT

ADJ = GND

V

LBTH

(V)

3.235

3.230

3.225

3.220

3.215

3.210

3.205

ADJ = GND

ADJ = V

CC

ADJ = GND

240

220

200

–50

ADJ = FLOAT

20

60

40

TEMPERATURE (°C)

80

100

4070 G07

3.200

–50

–25

0

25

50

75

TEMPERATURE (°C)

100

125

–25

0

25

50

75

TEMPERATURE (°C)

100

125

4070 G08

4070 G09

4070f

4

LTC4070

TYPICAL PERFORMANCE CHARACTERISTICS

V

OH

LBO/HBO vs I

SOURCE

2.5

T

A

= 25°C, unless otherwise noted.

V

OL

LBO/HBO vs I

SINK

V

CC

= 3.7V

2.0

V

CC

– V

OH

(V)

LBO

V

CC

= 3.1V

V

OL

(V)

1.5

HBO

V

CC

= V

F

– 25m

2.0

1.5

1.0

0.5

0

0.5

1.0

1.5

2.0

I

SOURCE

(mA)

2.5

3.0

4070 G10

0

2

4

6

I

SINK

(mA)

8

10

4070 G11

Power Spectral Density

35

30

25

20

15

10

5

0

Hot Plug Transient, C

C

= 330μF

,

R

IN

= 81Ω

CH4 = I

IN

(10mA/DIV)

CH1 = V

IN

(2V/DIV)

Step Response with 800mAHr

Battery, R

IN

= 81Ω

C

= 10μF I

CC

= 1mA, 1Hz Res

,

Bandwidth, Noise = 1.0452mV

RMS

from 10Hz to 100kHz

CH4 = I

IN

(10mA/DIV)

CH1 = V

IN

(2V/DIV)

PSD (μV

RMS

/√Hz)

CH2 = V

CC

(2V/DIV)

CH3 = V

HBO

(2V/DIV)

CH2 = V

CC

(2V/DIV)

CH3 = V

HBO

(2V/DIV)

1

10

100 1000 10000 100000

FREQUENCY (Hz)

4070 G12

4ms/DIV

4070 G13

400ns/DIV

4070 G14

4070f

5

LTC4070EDDBPBF

LTC4070EDDBPBF概述

文档预览

推荐资源