Features

n

LTC4012/

LTC4012-1/LTC4012-2

High Efficiency,

Multi-Chemistry Battery Charger

with PowerPath Control

Description

The LTC4012 is a constant-current /constant-volt-

age battery charger controller. It uses a synchronous

quasi-constant frequency PWM control architecture

that will not generate audible noise with ceramic bulk

capacitors. Charge current is set by external resis-

tors and can be monitored as an output voltage.

With no built-in termination, the LTC4012 family charges

a wide range of batteries under external control.

The LTC4012 features fully adjustable output voltage, while

the LTC4012-1 and LTC4012-2 can be pin-programmed for

Lithium-Ion/Polymer battery packs of 1-, 2-, 3- or 4-series

cells. The LTC4012-1 provides output voltage of 4.1V/cell

and the LTC4012-2 is a 4.2V/cell version.

The device includes AC adapter input current limiting, which

maximizes charge rate for a fixed input power level. An

external sense resistor programs the input current limit,

and the

ICL

status pin indicates reduced charge current as

a result of AC adapter current limiting. Ideal diode control

at the adaptor input improves charger efficiency.

The

CHRG

status pin is active during all charging modes,

including special indication for low charge current.

General Purpose Battery Charger Controller

n

Efficient 550kHz Synchronous Buck PWM Topology

n

±0.5% Output Float Voltage Accuracy

n

Programmable Charge Current: 4% Accuracy

n

Programmable AC Adapter Current Limit:

3% Accuracy

n

No Audible Noise with Ceramic Capacitors

n

INFET Low Loss Ideal Diode PowerPath™ Control

n

Wide Input Voltage Range: 6V to 28V

n

Wide Output Voltage Range: 2V to 28V

n

Indicator Outputs for AC Adapter Present, Charging,

C/10 Current Detection and Input Current Limiting

n

Analog Charge Current Monitor

n

Micropower Shutdown

n

20-Pin 4mm

×

4mm

×

0.75mm QFN Package

applications

n

Notebook Computers

Portable Instruments

Battery Backup Systems

L,

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

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

are the property of their respective owners. Protected by U.S. Patents including 5723970.

typical application

FROM

ADAPTER

13V TO 28V

INFET

DCIN

0.1µF

ACP

TO/FROM

MCU

CHRG

ICL

SHDN

ITH

6.04k

0.1µF

PROG

26.7k

4.7nF

CLP

CLN

BOOST

TGATE

SW

INTV

DD

BGATE

GND

CSP

LTC4012

CSN

BAT

FBDIV

V

FB

32.8k

25m

0.1µF

5.1k

20µF

POWER TO

SYSTEM

Efficiency at DCIN = 20V

100

95

EFFICIENCY (%)

EFFICIENCY

POWER LOSS (mW)

10000

0.1µF

90

85

80

75

70

POWER LOSS

1000

2µF

6.8µH

3.01k

33m

V

OUT

= 12.3V

R

SENSE

= 33m

R

IN

= 3.01k

R

PROG

= 26.7k

0

0.5

1

1.5

2

CHARGE CURRENT (A)

PIN NAME

2.5

3

100

3.01k

301k

20µF

+

12.3V

Li-Ion

BATTERY

4012 TA01

PART INFET DCDIV

LTC4009

X

LTC4012

X

4012 TA02

4012fa

LTC4012/

LTC4012-1/LTC4012-2

absolute MaxiMuM ratings

(Note 1)

DCIN ............................................................–14V to 30V

DCIN to CLP ................................................ –32V to 20V

CLP, CLN or SW to GND............................. –0.3V to 30V

CLP to CLN ............................................................±0.3V

CSP, CSN or BAT to GND ........................... –0.3V to 28V

CSP to CSN ............................................................±0.3V

BOOST to GND ........................................... –0.3V to 36V

BOOST to SW............................................... –0.3V to 7V

SHDN,

FVS0, FVS1 or V

FB

to GND ............... –0.3V to 7V

ACP, CHRG

or

ICL

to GND .......................... –0.3V to 30V

Operating Temperature Range

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

Junction Temperature (Note 3) ............................. 125°C

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

pin conFiguration

LTC4012

TOP VIEW

INTV

DD

BOOST

BGATE

TGATE

SW

LTC4012-1

LTC4012-2

BOOST

TOP VIEW

INTV

DD

BGATE

15 CSP

21

GND

14 CSN

13 PROG

12 ITH

11 BAT

6

SHDN

7

CHRG

8

ICL

9 10

FVS0

FVS1

TGATE

SW

20 19 18 17 16

CLN 1

CLP 2

INFET 3

DCIN 4

ACP

5

6

SHDN

7

CHRG

8

ICL

9 10

V

FB

FBDIV

21

GND

15 CSP

14 CSN

13 PROG

12 ITH

11 BAT

CLN 1

CLP 2

INFET 3

DCIN 4

ACP

5

20 19 18 17 16

UF PACKAGE

20-LEAD (4mm 4mm) PLASTIC QFN

T

JMAX

= 125°C,

JA

= 37°C/W

EXPOSED PAD (PIN 21) IS GND, MUST BE SOLDERED TO PCB

UF PACKAGE

20-LEAD (4mm 4mm) PLASTIC QFN

T

JMAX

= 125°C,

JA

= 37°C/W

EXPOSED PAD (PIN 21) IS GND, MUST BE SOLDERED TO PCB

orDer inForMation

LEAD FREE FINISH

LTC4012CUF#PBF

LTC4012CUF-1#PBF

LTC4012CUF-2#PBF

LTC4012IUF#PBF

LTC4012IUF-1#PBF

LTC4012IUF-2#PBF

TAPE AND REEL

LTC4012CUF#TRPBF

LTC4012CUF-1#TRPBF

LTC4012CUF-2#TRPBF

LTC4012IUF#TRPBF

LTC4012IUF-1#TRPBF

LTC4012IUF-2#TRPBF

PART MARKING*

4012

40121

40122

4012

40121

40122

PACKAGE DESCRIPTION

20-Lead (4mm

×

4mm) Plastic QFN

20-Lead (4mm

×

4mm) Plastic QFN

20-Lead (4mm

×

4mm) Plastic QFN

20-Lead (4mm

×

4mm) Plastic QFN

20-Lead (4mm

×

4mm) Plastic QFN

20-Lead (4mm

×

4mm) Plastic QFN

TEMPERATURE RANGE

0°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/

4012fa

LTC4012/

LTC4012-1/LTC4012-2

electrical characteristics

SYMBOL

V

TOL

PARAMETER

V

BAT

Accuracy (See Test Circuits)

Charge Voltage Regulation

LTC4012

C-Grade

I-Grade

LTC4012-1/LTC4012-2

C-Grade

FVS1 = 0V, FVS0 = 0V, I-Grade

FVS1 = 0V, FVS1 = 5V, I-Grade

FVS1 = 5V, FVS0 = 0V, I-Grade

FVS1 = 5V, FVS1 = 5V, I-Grade

I

VFB

R

ON

I

LEAK-FBDIV

V

BOV

V

FB

Input Bias Current

FBDIV On Resistance

FBDIV Output Leakage Current

V

FB

Overvoltage Threshold

BAT Overvoltage Threshold

Charge Current Regulation

I

TOL

Charge Current Accuracy with R

IN

= 3.01k,

6V < BAT < 18V (LTC4012)

6V < BAT < 15V (LTC4012-1, LTC4012-2)

Current Sense Amplifier Gain (PROG ∆I) with

R

IN

= 3.01k, 6V < BAT < 18V (LTC4012)

6V < BAT < 15V (LTC4012-1, LTC4012-2)

Maximum Peak Current Sense Threshold Voltage

per Cycle (R

IN

= 3.01k)

C/10 Indicator Threshold Voltage

Reverse Current Threshold Voltage

Current Limit Threshold

R

PROG

= 26.7k

C-Grade

I-Grade

V

SENSE

= 0mV, PROG = 1.2V

A

I

V

CS-MAX

V

C10

V

REV

V

CL

I

CLN

V

ICL

CLP Supply

OVR

V

UVLO

V

UV(HYST)

I

CLPO

Shutdown

V

ACP

V

ACP(HYST)

V

IL

V

IH

AC Present Threshold Voltage

DCIN – BAT, DCIN Rising

C-Grade

I-Grade

l

The

l

denotes the specifications which apply over the full operating

temperature range, otherwise specifications are at T

A

= 25°C. DCIN = 20V, BAT = 12V, GND = 0V unless otherwise noted. (Note 2)

CONDITIONS

MIN

–0.5

–0.8

–1.0

–0.6

–0.8

–1.1

–1.15

–1.25

–1.35

±20

l

TYP

MAX

0.5

0.8

1.0

0.6

0.8

1.1

1.15

1.25

1.35

UNITS

%

nA

Ω

µA

V

%

V

FB

= 1.2V

I

LOAD

= 100µA

SHDN

= 0V, FBDIV = 0V

LTC4012

LTC4012-1/LTC4012-2, Relative to

Selected Output Voltage

–1

1.235

103

85

0

1.281

106

190

1

1.32

109

–4

–5

–9.5

–12.75

–1.78

–11.67

–1.66

4

5

9.5

–10.95

–1.54

%

µA

V

SENSE

Step from 0mV to 5mV,

PROG = 1.2V

ITH = 2V, C-Grade

ITH = 2V, I-Grade

ITH = 5V

PROG Falling

CLP – CLN

C-Grade

I-Grade

CLN = CLP

(CLP – CLN) – V

CL

l

140

125

340

180

97

96

92

–8

6

195

325

400

253

100

±100

–5

250

265

430

460

295

103

104

108

–2

28

mV

nA

mV

V

mV

mA

Input Current Regulation

CLN Input Bias Current

ICL

Indicator Threshold

Operating Voltage Range

CLP Undervoltage Lockout Threshold

UVLO Threshold Hysteresis

CLP Operating Current

CLP Increasing

CLP = 20V, No Gate Loads

l

4.65

4.85

200

2

5.25

3

350

300

500

200

650

700

300

mV

V

4012fa

ACP

Threshold Hysteresis Voltage

SHDN

Input Voltage Low

SHDN

Input Voltage High

l

1.4

LTC4012/

LTC4012-1/LTC4012-2

electrical characteristics

SYMBOL

R

IN

I

CLPS

I

LEAK-BAT

I

LEAK-CSN

I

LEAK-CSP

I

LEAK-SW

PARAMETER

SHDN

Pull-Down Resistance

CLP Shutdown Current

BAT Leakage Current

CSN Leakage Current

CSP Leakage Current

SW Leakage Current

CLP = 12V, DCIN = 0V

SHDN

= 0V

SHDN

= 0V or DCIN = 0V,

0V ≤ CSP = CSN = BAT ≤ 18V

SHDN

= 0V or DCIN = 0V,

0V ≤ CSP = CSN = BAT ≤ 20V

SHDN

= 0V or DCIN = 0V,

0V ≤ CSP = CSN = BAT ≤ 20V

SHDN

= 0V or DCIN = 0V,

0V ≤ SW ≤ 20V

No Load

I

DD

= 20mA

INTV

DD

= 0V

ITH = 1.4V

467

C

LOAD

= 3.3nF

C

LOAD

= 3.3nF

C

LOAD

= 3.3nF, 10% – 90%

C

LOAD

= 3.3nF, 90% – 10%

C

LOAD

= 3.3nF, 10% – 90%

C

LOAD

= 3.3nF, 90% – 10%

C

LOAD

= 3.3nF, 10% – 10%

0V ≤ DCIN ≤ CLP

DCIN-CLP, DCIN rising

DCIN-CLP

DCIN-CLP DCIN falling

,

DCIN-CLP = 0.1V, I

INFET

=1µA

DCIN-CLP = –0.1V, I

INFET

=–5µA

To CLP-INFET > 3V, C

INFET

= 1nF

To CLP-INFET < 1.5V, C

INFET

= 1nF

l

The

l

denotes the specifications which apply over the full operating

temperature range, otherwise specifications are at T

A

= 25°C. DCIN = 20V, BAT = 12V, GND = 0V unless otherwise noted. (Note 2)

CONDITIONS

MIN

TYP

40

15

350

–1.5

–1

0

26

500

1.5

2

MAX

UNITS

kΩ

µA

INTV

DD

Regulator

INTV

DD

∆V

DD

I

DD

I

ITH

f

TYP

f

MIN

DC

MAX

t

R-TG

t

F-TG

t

R-BG

t

F-BG

t

NO

I

DCIN

V

FTO

V

FR

V

RTO

V

OL(INFET)

V

OH(INFET)

t

IF(ON)

t

IF(OFF)

V

IL

V

IH

I

IN

V

OL

I

LEAK

I

C10

Output Voltage

Load Regulation

Short-Circuit Current (Note 5)

ITH Current

Typical Switching Frequency

Minimum Switching Frequency

Maximum Duty Cycle

TGATE Rise Time

TGATE Fall Time

BGATE Rise Time

BGATE Fall Time

TGATE, BGATE Non-Overlap Time

DCIN Input Current

Forward Turn-On Voltage (DCIN Detection Threshold)

Forward Regulation Voltage

Reverse Turn-Off Voltage

INFET Output Low Voltage, Relative to CLP

INFET Output High Voltage, Relative to CLP

INFET Turn-On Time

INFET Turn-Off Time

Input Voltage Low

Input Voltage High

Input Current

Output Voltage Low

Output Leakage

CHRG

C/10 Current Sink

0V ≤ V

IN

≤ 5V

I

LOAD

= 100µA, PROG = 1.2V

SHDN

= 0V, DCDIV = 0V,

V

OUT

= 20V

CHRG

= 2.5V

l

4.85

50

5

–0.4

85

–40/+90

550

25

99

60

50

60

110

5.15

–1

130

V

%

mA

µA

Switching Regulator

633

kHz

%

110

ns

60

25

–25

35

–15

–5

250

85

2.5

180

6

0.5

3.5

–10

10

500

–10

15

25

10

38

µA

mV

V

mV

µs

V

µA

mV

µA

4012fa

20

98

PowerPath Control

–10

15

–45

–6.5

–250

Float Voltage Select Inputs (LTC4012-1/LTC4012-2 Only)

Indicator Outputs

LTC4012/

LTC4012-1/LTC4012-2

electrical characteristics

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 LTC4012C is guaranteed to meet performance specifications

over the 0°C to 85°C operating temperature range. The LTC4012I is

guaranteed to meet performance specifications over the –40°C to 125°C

operating temperature range.

Note 3:

Operating junction temperature T

J

(in °C) is calculated from

the ambient temperature T

A

and the total continuous package power

dissipation P

D

(in watts) by the formula T

J

= T

A

+ (θ

JA

• PD). Refer to the

Applications Information section for details.

Note 4:

All currents into device pins are positive; all currents out of device

pins are negative. All voltages are referenced to GND, unless otherwise

specified.

Note 5:

Output current may be limited by internal power dissipation. Refer

to the Applications Information section for details.

test circuits

LTC4012

FROM ICL

(CLP = CLN)

1.2085V

–

+

EA

PROG

13

9

V

FB

ITH

12

1.2085V

TARGET

+

LTC1055

–

40012 TC01

0.6V

LTC4012-1

LTC4012-2

FROM ICL

(CLP = CLN)

1.2085V

–

+

EA

PROG

13

BAT

11

TARGET VARIES

WITH FVSO,1

ITH

12

+

LTC1055

–

40012 TC02

0.6V

4012fa

参数名称	属性值
欧盟限制某些有害物质的使用	Compliant
ECCN (US)	EAR99
Part Status	Active
HTS	8542.39.00.01
类型 Type	Switching Battery Charger Controller
Battery Type	Li-Ion\|Li-Pol
Maximum Supply Current (mA)	3
Minimum Operating Supply Voltage (V)	6
Maximum Operating Supply Voltage (V)	28
Output Voltage (V)	2 to 28
Output Current (mA)	12000(Max)
Minimum Operating Temperature (°C)	0
Maximum Operating Temperature (°C)	85
Supplier Temperature Grade	Commercial
系列 Packaging	Tape and Reel
Pin Count	20
Standard Package Name	QFN
Supplier Package	QFN EP
Mounting	Surface Mount
Package Height	0.75(Max)
Package Length	4
Package Width	4
PCB changed	20
Lead Shape	No Lead

	LTC4012CUF-1#TRPBF	LTC4012CUF#PBF	LTC4012CUF#TRPBF	LTC4012CUF-1#PBF	LTC4012CUF-2#PBF	LTC4012CUF-2#TRPBF
描述	Switching Battery Charger Controller Li-Ion/Li-Pol 12000mA 2V to 28V 20-Pin QFN EP T/R	Switching Battery Charger Controller Lead-Acid/Li-FePO4/Li-Ion/Li-Pol/NiCd/NiMH 12000mA 2V to 28V 20-Pin QFN EP Tube	Switching Battery Charger Controller Lead-Acid/Li-FePO4/Li-Ion/Li-Pol/NiCd/NiMH 12000mA 2V to 28V 20-Pin QFN EP T/R	Switching Battery Charger Controller Li-Ion/Li-Pol 12000mA 2V to 28V 20-Pin QFN EP Tube	Switching Battery Charger Controller Li-Ion/Li-Pol 12000mA 2V to 28V 20-Pin QFN EP Tube	Switching Battery Charger Controller Li-Ion/Li-Pol 12000mA 2V to 28V 20-Pin QFN EP T/R
欧盟限制某些有害物质的使用	Compliant	Compliant	Compliant	Compliant	Compliant	Compliant
ECCN (US)	EAR99	EAR99	EAR99	EAR99	EAR99	EAR99
Part Status	Active	Active	Active	Active	Active	Active
类型 Type	Switching Battery Charger Controller	Switching Battery Charger Controller	Switching Battery Charger Controller	Switching Battery Charger Controller	Switching Battery Charger Controller	Switching Battery Charger Controller
Battery Type	Li-Ion\|Li-Pol	Lead-Acid\|Li-FePO4\|Li-Ion\|Li-Pol\|NiCd\|NiMH	Lead-Acid\|Li-FePO4\|Li-Ion\|Li-Pol\|NiCd\|NiMH	Li-Ion\|Li-Pol	Li-Ion\|Li-Pol	Li-Ion\|Li-Pol
Maximum Supply Current (mA)	3	3	3	3	3	3
Minimum Operating Supply Voltage (V)	6	6	6	6	6	6
Maximum Operating Supply Voltage (V)	28	28	28	28	28	28
Output Voltage (V)	2 to 28	2 to 28	2 to 28	2 to 28	2 to 28	2 to 28
Output Current (mA)	12000(Max)	12000(Max)	12000(Max)	12000(Max)	12000(Max)	12000(Max)
Maximum Operating Temperature (°C)	85	85	85	85	85	85
Supplier Temperature Grade	Commercial	Commercial	Commercial	Commercial	Commercial	Commercial
系列 Packaging	Tape and Reel	Tube	Tape and Reel	Tube	Tube	Tape and Reel
Pin Count	20	20	20	20	20	20
Standard Package Name	QFN	QFN	QFN	QFN	QFN	QFN
Supplier Package	QFN EP	QFN EP	QFN EP	QFN EP	QFN EP	QFN EP
Mounting	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package Height	0.75(Max)	0.75(Max)	0.75(Max)	0.75(Max)	0.75(Max)	0.75(Max)
Package Length	4	4	4	4	4	4
Package Width	4	4	4	4	4	4
PCB changed	20	20	20	20	20	20
Lead Shape	No Lead	No Lead	No Lead	No Lead	No Lead	No Lead

LTC4012CUF-1#TRPBF

LTC4012CUF-1#TRPBF概述

LTC4012CUF-1#TRPBF规格参数

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