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LT3650-4.1/LT3650-4.2

High Voltage 2 Amp

Monolithic Li-Ion Battery Charger

FEATURES

n

DESCRIPTION

The LT

®

3650 is a complete monolithic single-cell Li-Ion/

Polymer battery charger that operates over a 4.75V to

32V input voltage range (7.5V minimum start-up voltage).

The LT3650 provides a constant-current/constant-volt-

age charge characteristic, with maximum charge current

externally programmable up to 2A, set using an external

current sense resistor. A precondition feature trickle-

charges a low voltage battery, and bad-battery detection

provides a signal and suspends charging if a battery does

not respond to preconditioning.

The LT3650 can be conﬁgured to terminate charging when

charge current falls to C/10, or one-tenth the programmed

maximum current. Once charging is terminated, the LT3650

enters a low current (85μA) standby mode. An auto-restart

feature starts a new charging cycle if the battery voltage

drops 2.5% from the ﬂoat voltage, or if a new battery is

inserted into a charging system.

The LT3650 contains a user-programmable internal safety

timer (typically set to a three hour full cycle time). The IC

can be conﬁgured to use this internal timer if a time-based

termination scheme is desired in which charging can con-

tinue below C/10 until a desired time is reached.

The LT3650 is available in a low proﬁle (0.75mm) 3mm

×

3mm 12-pin DFN and 12-pin MSOP packages.

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.

Wide Input Voltage Range: 4.75V to 32V

(40V Absolute Maximum)

Programmable Charge Current Up to 2A

User-Selectable Termination: C/10 or Onboard

Termination Timer

Dynamic Charge Rate Programming/Soft-Start Pin

Programmable Input Current Limit

No V

IN

Blocking Diode Required

1MHz Fixed Frequency

Average Current Mode Control

0.5% Float Voltage Accuracy

5% Charge Current Accuracy

2.5% C/10 Detection Accuracy

NTC Resistor Temperature Monitor

Auto-Recharge at 97.5% Float Voltage

Auto-Precondition at <70% Float Voltage

Bad-Battery Detection with Auto-Reset

Binary Coded Open-Collector Status Pins

3mm

×

3mm DFN-12 or MSOP-12 Package

APPLICATIONS

n

Industrial Handheld Instruments

12V to 24V Automotive and Heavy Equipment

Desktop Cradle Chargers

Notebook Computers

TYPICAL APPLICATION

7.5V to 32V Single-Cell Li-Ion 2A Charger

CMSH3-40MA

1μF

CLP

LT3650-4.2

SHDN

CHRG

FAULT

TIMER

BAT

NTC

RNG/SS

10μF

SENSE

0.05Ω

BOOST

CMPSH1-4

6.8μH

EFFICIENCY (%)

V

IN

7.5V to 32V

10μF

V

IN

SW

90

100

V

BAT

and Efﬁciency vs I

BAT

V

BAT

4.20

V

IN

= 12V

80

V

IN

= 20V

4.15

V

BAT

(V)

4.10

70

+

Li-ION

BATTERY

3650 TA01a

4.05

60

0

0.5

1

I

BAT

(A)

1.5

2

365042 TA01b

36504142fb

1

LT3650-4.1/LT3650-4.2

ABSOLUTE MAXIMUM RATINGS

(Note 1)

V

IN

............................................................................40V

SHDN, CHRG, FAULT

............................... V

IN

+ 0.5V, 40V

CLP ......................................................... V

IN

± 0.5V, 40V

SW ............................................................................40V

SW-V

IN

.....................................................................4.5V

BOOST .....................................................SW + 10V, 50V

SENSE, BAT ..............................................................10V

SENSE-BAT ............................................... –0.5V to 0.5V

TIMER, RNG/SS, NTC ..............................................2.5V

Operating Junction Temperature Range

(Note 2)..................................................–40°C to 125°C

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

Lead Temperature (Soldering, 10 sec)

MSE .................................................................. 300°C

PIN CONFIGURATION

TOP VIEW

V

IN

CLP

SHDN

CHRG

FAULT

TIMER

1

2

3

4

5

6

13

12 SW

11 BOOST

10 SENSE

9 BAT

8 NTC

7 RNG/SS

V

IN

CLP

SHDN

CHRG

FAULT

TIMER

1

2

3

4

5

6

TOP VIEW

12

11

10

9

8

7

SW

BOOST

SENSE

BAT

NTC

RNG/SS

13

DD PACKAGE

12-LEAD (3mm 3mm) PLASTIC DFN

T

JMAX

= 125°C,

θ

JA

= 43°C/W,

θ

JC

= 3°C/W

EXPOSED PAD (PIN 13) IS GND, MUST BE SOLDERED TO PCB

MSE PACKAGE

12-LEAD PLASTIC MSOP

T

JMAX

= 125°C,

θ

JA

= 43°C/W,

θ

JC

= 3°C/W

EXPOSED PAD (PIN 13) IS GND, MUST BE SOLDERED TO PCB

ORDER INFORMATION

LEAD FREE FINISH

LT3650EDD-4.1#PBF

LT3650IDD-4.1#PBF

LT3650EDD-4.2#PBF

LT3650IDD-4.2#PBF

LT3650EMSE-4.1#PBF

LT3650IMSE-4.1#PBF

LT3650EMSE-4.2#PBF

LT3650IMSE-4.2#PBF

TAPE AND REEL

LT3650EDD-4.1#TRPBF

LT3650IDD-4.1#TRPBF

LT3650EDD-4.2#TRPBF

LT3650IDD-4.2#TRPBF

LT3650EMSE-4.1#TRPBF

LT3650IMSE-4.1#TRPBF

LT3650EMSE-4.2#TRPBF

LT3650IMSE-4.2#TRPBF

PART MARKING*

LFGQ

LDDS

365041

365042

PACKAGE DESCRIPTION

12-Lead Plastic DFN (3mm

×

3mm)

12-Lead Plastic DFN (3mm

×

3mm)

12-Lead Plastic DFN (3mm

×

3mm)

12-Lead Plastic DFN (3mm

×

3mm)

12-Lead Plastic MSOP

TEMPERATURE RANGE

–40°C to 85°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/

36504142fb

2

LT3650-4.1/LT3650-4.2

ELECTRICAL CHARACTERISTICS

SYMBOL

LT3650

V

IN

V

IN(OVLO)

V

IN(UVLO)

V

BAT(FLT)

V

IN

Operating Range

V

IN

Start Voltage

OVLO Threshold

OVLO Hysteresis

UVLO Threshold

UVLO Hysteresis

Battery Float Voltage

(Note 3)

V

IN

Rising

V

IN

Rising

LT3650-4.1

LT3650-4.2

ΔV

RECHRG

V

BAT(PRE)

V

BAT(PREHYST)

I

VIN

Recharge Battery Threshold

Battery Precondition Threshold Voltage

Battery Precondition Threshold

Hysteresis

Operating Input Supply Current

CC/CV Mode, I

SW

= 0

Standby Mode

Shutdown (SHDN = 0)

Switch-On, I

SW

= 0

2.5V < V

(BOOST – SW)

< 4.5V

I

SW

= 2A

V

IN

– V

SW

, I

SW

= 2A

l

The

l

denotes the speciﬁcations which apply over the full operating

.

temperature range, otherwise speciﬁcations are at V

IN

= 20V, BOOST-SW = 4V,

SHDN

= 2V, SENSE = BAT = V

BAT(FLT)

, C

TIMER

= 0.68μF

PARAMETER

CONDITIONS

MIN

4.75

32

35

1

4.6

0.2

4.08

4.06

4.18

4.16

4.1

4.2

–100

2.9

90

2.5

85

15

20

30

350

2.5

15

l

TYP

MAX

32

7.5

40

4.75

4.12

4.14

4.22

4.24

UNITS

V

mV

V

mV

l

Threshold Voltage Relative to V

BAT(FLT)

V

BAT

Rising

3.5

mA

μA

mA

mA/A

mV

A

mV

I

BOOST

I

BOOST

/I

SW

V

SW(ON)

I

SW(MAX)

V

SENSE(PRE)

V

CLP(DC)

I

CLP

V

SENSE(DC)

V

SENSE(C/10)

I

BAT

I

SENSE

I

REVERSE

V

NTC(H)

V

NTC(L)

V

NTC(HYST)

R

NTC(DIS)

I

NTC

I

RNG/SS

V

RNG/SS

/ V

SENSE

V

SHDN

V

SHDN(HYST)

I

SHDN

BOOST Supply Current

BOOST Switch Drive

Switch-On Voltage Drop

Switch Current Limit

Precondition Current Sense Voltage

CLP Threshold Voltage

CLP Input Bias Current

Maximum Current Sense Voltage

C/10 Trigger Sense Voltage

BAT Input Bias Current

SENSE Input Bias Current

Charger Reverse Current:

I

BAT

+ I

SENSE

+ I

SW

NTC Range Limit (High)

NTC Range Limit (Low)

NTC Threshold Hysteresis

NTC Disable Impedance

NTC Bias Current

I

RNG/SS

Bias Current

Current Limit Programming:

V

RNG/SS

/V

SENSE(MAX)

Shutdown Threshold

Shutdown Hysteresis

SHDN

Input Bias Current

V

SENSE

– V

BAT

V

BAT

= 2.5

V

CLP

– V

IN

; V

SENSE

– V

BAT

= 50mV

V

SENSE

– V

BAT

; V

BAT

= 3.5V, V

RNG/SS

= 1.2V

Charging Terminated

V

IN

= 0V; BAT = SENSE = SW = V

BAT(FLT)

V

NTC

Rising

V

NTC

Falling

% of Threshold

Minimum External Impedance to GND

V

NTC

= 0.8V

V

RNG/SS

= 0.5

Rising

l

37.5

95

7.5

50

200

100

10

0.1

1

62.5

105

12.5

1

mV

nA

mV

μA

1.25

0.27

250

47.5

45

8.5

1.17

1.36

0.29

20

500

50

10

1.20

120

–10

1.45

0.315

V

%

kΩ

52.5

55

11.5

1.23

μA

V/V

V

mV

nA

36504142fb

3

LT3650-4.1/LT3650-4.2

ELECTRICAL CHARACTERISTICS

SYMBOL

V

CHRG

, V

FAULT

I

TIMER

V

TIMER(DIS)

t

TIMER

PARAMETER

Status Low Voltage

Charge/Discharge Current

Timer Disable Threshold

Full Charge Cycle Timeout

Precondition Timeout

Timer Accuracy

f

O

DC

Operating Frequency

Duty Cycle Range

Continuous Operation

l

The

l

denotes the speciﬁcations which apply over the full operating

.

temperature range, otherwise speciﬁcations are at V

IN

= 20V, BOOST-SW = 4V,

SHDN

= 2V, SENSE = BAT = V

BAT(FLT)

, C

TIMER

= 0.68μF

CONDITIONS

10mA Load

l

MIN

TYP

25

MAX

0.4

UNITS

V

μA

V

hr

min

0.1

0.25

3

22.5

–10

0.9

15

1

10

1.1

90

%

MHz

%

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 LT3650E is guaranteed to meet performance speciﬁcations

from 0°C to 85°C. Speciﬁcations over the –40°C to 85°C operating

temperature range are assured by design, characterization and correlation

with statistical process controls. The LT3650I speciﬁcations are

guaranteed over the full –40°C to 85°C temperature range. High junction

temperatures degrade operating lifetimes.

Note 3:

V

IN

voltages below the start threshold are only supported if

(V

BOOST

– V

SW

) > 2V.

TYPICAL PERFORMANCE CHARACTERISTICS

Battery Float Voltage

vs Temperature

100

0.1

95

T

A

= 25°C, unless otherwise noted.

Maximum Charge Current vs I

RNG/SS

Voltage, I

CHG(MAX)

as a Percentage

of Programmed I

MAX

100

V

IN

Standby Mode Current

vs Temperature

80

I

VIN

CURRENT (μA)

0.05

ΔV

BAT(FLT)

(%)

90

I

CHG(MAX)

(%)

–25

50

25

0

TEMPERATURE (°C)

75

100

85

80

75

20

–0.1

–50

–25

50

25

0

75

TEMPERATURE (°C)

100

125

70

65

–50

0

0.2

0.4

0.6

V

RNG/SS

365042 G02

365042 G03

60

0

40

–0.05

0.8

1.0

1.2

3650 G01

36504142fb

4

LT3650-4.1/LT3650-4.2

TYPICAL PERFORMANCE CHARACTERISTICS

Switch Drive (I

SW

/I

BOOST

)

vs I

SW

36

33

SWITCH FORWARD DROP (mV)

30

27

24

I

SW

/I

BOOST

21

18

15

12

9

6

3

0

0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0

I

SW

(A)

365042 G04

T

A

= 25°C, unless otherwise noted.

CC/CV Charging; SENSE Pin Bias

Current vs V

SENSE

100

50

0

–50

I

SENSE

(μA)

–100

–150

–200

–250

–300

–350

LT3650-4.2

Switch Forward Drop (V

IN

– V

SW

)

vs Temperature

480

460

440

420

400

380

360

340

320

–50

–25

50

25

0

75

TEMPERATURE (°C)

100

125

I

SW

= 2A

0

0.5

1

1.5

2.5 3

V

SENSE

(V)

2

3.5

4

4.5

365042 G05

365042 G06

C/10 Threshold (V

SENSE

– V

BAT

)

vs Temperature

12

51.0

50.8

11

V

SENSE

– V

BAT

(mV)

V

CLP

– V

IN

(mV)

50.6

CLP Input Limit Threshold

(V

CLP

– V

IN

) vs Temperature,

I

CHG

at 50%

101.0

100.8

100.6

V

SENSE

– V

BAT

(mV)

100.4

100.2

100.0

99.8

99.6

99.4

99.2

–25

50

25

0

75

TEMPERATURE (°C)

100

125

I

MAX

Current Limit (V

SENSE

– V

BAT

)

vs Temperature

V

BAT

= 3.5V

50.4

50.2

50.0

49.8

49.6

10

9

49.4

49.2

8

–50

–25

50

25

0

75

TEMPERATURE (°C)

100

125

49.0

–50

99.0

–50

–25

50

25

0

75

TEMPERATURE (°C)

100

125

365042 G07

365042 G08

365042 G09

Thermal Foldback – I

MAX

Current Limit (V

SENSE

– V

BAT

)

vs Temperature

120

100

V

SENSE

– V

BAT

(mV)

80

60

40

20

0

25 35 45 55 65 75 85 95 105 115 125 135

TEMPERATURE (°C)

365042 G10

CC/CV Charging; BAT Pin Bias

Current vs V

BAT

2.2

LT3650-4.2

2.0

1.8

1.6

1.4

1.2

1.0

0.8

0.6

0.4

0.2

0.0

–0.2

–0.4

0 0.5 1 1.5

I

BAT

(mA)

2 2.5

V

BAT

(V)

3

3.5

4

4.5

365042 G11

36504142fb

5

LT3650EMSE-4.1TRPBF

LT3650EMSE-4.1TRPBF概述

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