MCP73871T-1CAI/ML_技术文档

MCP73871

Stand-Alone System Load Sharing and Li-Ion / Li-Polymer

Battery Charge Management Controller

Features

Applications

• Integrated System Load Sharing and Battery

Charge Management

• GPSs / Navigators

• PDAs and Smart Phones

• Portable Media Players and MP3 Players

• Digital Cameras

- Simultaneously Power the System and

Charge the Li-Ion Battery

- Voltage Proportional Current Control (VPCC)

ensures system load has priority over Li-Ion

battery charge current

• Bluetooth Headsets

• Portable Medical Devices

• Charge Cradles / Docking Stations

• Toys

- Low-Loss Power-Path Management with

Ideal Diode Operation

• Complete Linear Charge Management Controller

- Integrated Pass Transistors

Description

- Integrated Current Sense

The MCP73871 device is a fully integrated linear

solution for system load sharing and Li-Ion / Li-Polymer

battery charge management with ac-dc wall adapter

and USB port power sources selection. It’s also

capable of autonomous power source selection

between input or battery. Along with its small physical

size, the low number of required external components

makes the device ideally suited for portable

applications.

- Integrated Reverse Discharge Protection

- Selectable Input Power Sources: USB Port or

AC-DC Wall Adapter

• Preset High Accuracy Charge Voltage Options:

- 4.10V, 4.20V, 4.35V or 4.40V

- ±0.5% Regulation Tolerance

• Constant Current / Constant Voltage (CC/CV)

Operation with Thermal Regulation

The MCP73871 device automatically obtains power for

the system load from a single-cell Li-Ion battery or an

input power source (ac-dc wall adapter or USB port).

The MCP73871 device specifically adheres to the

current drawn limits governed by the USB specification.

With an ac-dc wall adapter providing power to the

system, an external resistor sets the magnitude of 1A

maximum charge current while supports up to 1.8A

total current for system load and battery charge

current.

• Maximum 1.8A Total Input Current Control

• Resistor Programmable Fast Charge Current

Control: 50 mA to 1A

• Resistor Programmable Termination Set Point

• Selectable USB Input Current Control

- Absolute Maximum: 100 mA (L) / 500 mA (H)

• Automatic Recharge

• Automatic End-of-Charge Control

• Safety Timer With Timer Enable/Disable Control

• 0.1C Preconditioning for Deeply Depleted Cells

• Battery Cell Temperature Monitor

The MCP73871 device employs a constant current /

constant voltage (CC/CV) charge algorithm with

selectable charge termination point. The constant

voltage regulation is fixed with four available options:

4.10V, 4.20V, 4.35V, or 4.40V to accommodate new,

emerging battery charging requirements. The

MCP73871 device also limits the charge current based

on die temperature during high power or high ambient

conditions. This thermal regulation optimizes the

charge cycle time while maintaining device reliability.

• Undervoltage Lockout (UVLO)

• Low Battery Status Indicator (LBO)

• Power-Good Status Indicator (PG)

• Charge Status and Fault Condition Indicators

• Numerous Selectable Options Available for a

Variety of Applications:

- Refer to Section 1.0 “Electrical

The MCP73871 device includes a low battery indicator,

Characteristics” for Selectable Options”

a

power-good indicator and two charge status

indicators that allows for outputs with LEDs or

communication with host microcontrollers. The

MCP73871 device is fully specified over the ambient

temperature range of -40°C to +85°C.

- Refer to the “Product Identification

System” for Standard Options

• Temperature Range: -40°C to +85°C

• Packaging: 20-Lead QFN (4 mm x 4 mm)

DS22090B-page 1

MCP73871

Package Types

MCP73871

20-Lead QFN

20 19 18 17 16

OUT

1

V_BAT

15

14

13

VPCC 2

SEL

V_BAT

EP

21

3

4

PROG1

12 PROG3

PROG2

V_SS

11

THERM 5

6

7

8

10

9

Typical Application Circuit

MCP73871 Typical Application

Ac-dc Adapter

or

USB Port

18, 19

2

1, 20

System

Load

IN

OUT

V_BAT

10 µF

4.7 µF

14, 15, 16

VPCC

470Ω

6

4.7 µF

PG

NTC

470Ω

THERM 5

7

8

STAT2

10 kΩ

Single-Cell

Li-Ion Battery

STAT1

LBO

PROG1

R_PROG1

13

3

4

SEL

Hi

Low

R_PROG3

12

PROG3

PROG2

TE

9

Hi

Low

17

V_SS10, 11, EP

CE

DS22090B-page 2

MCP73871

Functional Block Diagram

Direction

Control

0.2Ω

OUT

IN

G=0.001

CURRENT

LIMIT

+

0.2Ω

Ideal

Diode,

-

V

REF

Synchronous

Switch

Direction

Control

V

BAT

PROG1

PROG3

G=0.001

CURRENT

LIMIT

+

V

/2

REF

-

V

+

REF

VPCC

-

SEL

PROG2

CA

+

-

V

REF

PRECONDITION

+

V

BAT_SENSE

-

V

REF

CHRG

-

V

REF

+

VA

+

-

V

REF

PG

TERM

-

REF

UVLO,

+

STAT1

STAT2

REFERENCE,

CHARGE

CONTROL,

TIMER,

HTVT

+

V

REF

50 µA

AND

STATUS

LOGIC

-

TE

CE

LTVT

+

THERM

-

V

SS

DS22090B-page 3

MCP73871

NOTES:

DS22090B-page 4

MCP73871

† Notice: Stresses above those listed under “Maximum

Ratings” may cause permanent damage to the device. This is

a stress rating only and functional operation of the device at

those or any other conditions above those indicated in the

operational listings of this specification is not implied.

Exposure to maximum rating conditions for extended periods

may affect device reliability.

1.0

ELECTRICAL

CHARACTERISTICS

Absolute Maximum Ratings†

V

_IN....................................................................................7.0V

All Inputs and Outputs w.r.t. ................ V_SS-0.3V to V_DD+0.3V

(V_DD= V_INor V_BAT

)

Maximum Junction Temperature, T_J............Internally Limited

Storage temperature .....................................-65°C to +150°C

ESD protection on all pins

Human Body Model (1.5 kΩ in Series with 100pF)........≥ 4 kV

Machine Model (200 pF, No Series Resistance).............300V

DC CHARACTERISTICS

Electrical Specifications: Unless otherwise indicated, all limits apply for V_IN= V_REG+ 0.3V to 6V, T_A= -40°C to +85°C.

Typical values are at +25°C, V_IN= [V_REG(typical) + 1.0V]

Parameters

Sym

Min

Typ

Max

Units

Conditions

Supply Input

Supply Voltage

V_IN

I_SS

V_REG

+0.3V

—

6

V

Supply Current

—

2500

260

180

28

3750

350

300

50

µA

Charging

Charge Complete

Standby

Shutdown

(V_DD< V_BAT- 100 mV or

V

_DD< V_STOP)

UVLO Start Threshold

UVLO Stop Threshold

UVLO Hysteresis

V_START

V_STOP

V_HYS

V_REG

0.05V

+

V_REG

0.15V

+

V_REG

0.25V

+

V

V_DD= Low-to-High

V_REG

0.07V

–

V_REG

0.07V

+

V_REG

0.17V

+

V_DD= High-to-Low

—

90

—

mV

Voltage Regulation (Constant Voltage Mode)

Regulated Charge Voltage

V_REG

4.080

4.179

4.328

4.378

-0.5

4.10

4.20

4.35

4.40

—

4.121

4.221

4.372

4.422

+0.5

V

V_DD=[V_REG(typical)+1V]

I_OUT=10 mA

T_A=-5°C to +55°C

Regulated Charge Voltage Tolerance

V_RTOL

%

T_A= +25°C

-0.75

—

+0.75

0.20

T_A= -5°C to +55°C

Line Regulation

|(ΔV_BAT/V_BAT)/

0.08

%/V V_DD=[V_REG(typical)+1V] to 6V

_OUT=10 mA

I_OUT=10 mA to 150 mA

_DD= [V_REG(typical)+1V]

ΔV_DD

|

I

Load Regulation

|ΔV_BAT/V_BAT

|

—

0.08

0.18

%

V

Supply Ripple Attenuation

PSRR

—

-47

-40

—

dB

I_OUT=10 mA, 1 kHz

I_OUT=10 mA, 10 kHz

Current Regulation (Fast Charge Constant-Current Mode)

AC-Adapter Fast Charge Current

I_REG

90

100

110

mA PROG1 = 10 kΩ

mA PROG1 = 1 kΩ,

900

1000

1100

T_A=-5°C to +55°C, SEL = Hi

USB Fast Charge Current

I_REG

80

90

100

500

mA PROG2 = Low, SEL = Low,

(Note 2)

400

450

mA PROG2 = High, SEL = Low,

(Note 2)

T_A= -5°C to +55°C

Note 1: The value is ensured by design and not production tested.

2: The maximum available charge current is also limited by the value set at PROG1 input.

DS22090B-page 5

MCP73871

DC CHARACTERISTICS (CONTINUED)

Electrical Specifications: Unless otherwise indicated, all limits apply for V_IN= V_REG+ 0.3V to 6V, T_A= -40°C to +85°C.

Typical values are at +25°C, V_IN= [V_REG(typical) + 1.0V]

Parameters

Sym

Min

Typ

Max

Units

Conditions

Input Current Limit Control (ICLC)

USB-Port Supply Current Limit

I_{LIMIT_USB}

80

90

100

500

mA PROG2 = Low, SEL = Low

mA PROG2 = High, SEL = Low

T_A=-5°C to +55°C

400

450

AC-DC Adapter Current Limit

I_{LIMIT_AC}

1500

1650

1800

mA SEL = High, T_A=-5°C to +55°C

Voltage Proportional Charge Control (VPCC - Input Voltage Regulation)

VPCC Input Threshold

V_VPCC

V_RTOL

I_LK

—

-3

—

1.23

—

+3

1

V

%

I_OUT=10 mA

VPCC Input Threshold Tolerance

Input Leakage Current

T_A=-5°C to +55°C

V_VPCC= V_DD

0.01

µA

Precondition Current Regulation (Trickle Charge Constant-Current Mode)

Precondition Current Ratio

I_PREG/ I_REG

7.5

10

12.5

%

PROG1 = 1.0 kΩ to 10 kΩ

T_A=-5°C to +55°C

Precondition Current Threshold Ratio

Precondition Hysteresis

V_PTH/ V_REG

V_PHYS

69

—

72

75

—

V_BATLow-to-High

105

mV V_BATHigh-to-Low

Automatic Charge Termination Set Point

Charge Termination Current Ratio

I_TERM

75

100

10

125

mA PROG3 = 10 kΩ

7.5

12.5

mA PROG3 = 100 kΩ

T_A=-5°C to +55°C

Automatic Recharge

Recharge Voltage Threshold Ratio

V_RTH

V_REG

-

V_REG

-

V_REG

-

V

V_BATHigh-to-Low

0.21V

0.15V

200

30

0.09V

IN-to-OUT Pass Transistor ON-Resistance

ON-Resistance

R_{DS_ON}

—

mΩ V_DD= 4.5V, T_J= 105°C

Charge Transistor ON-Resistance

ON-Resistance

R_{DSON_}

—

BAT-to-OUT Pass Transistor ON-Resistance

ON-Resistance

R_{DS_ON}

—

Battery Discharge Current

Output Reverse Leakage Current

I_DISCHARGE

—

40

µA

Shutdown

(V_BAT< V_DD< V_UVLO

)

—

30

-6

40

µA

Shutdown (0 < V_DD< V_BAT)

V_BAT= Power Out, No Load

Charge Complete

-13

Status Indicators - STAT1 (LBO), STAT2, PG

Sink Current

I_SINK

V_OL

I_LK

—

16

0.4

35

1

mA

V

Low Output Voltage

I_SINK= 4 mA

Input Leakage Current

0.01

1

µA

High Impedance, V_DDon pin

Low Battery Indicator (LBO)

Low Battery Detection Threshold

V_LBO

—

Disable

3.0

—

V_BAT> V_IN, PG = Hi-Z

T_A=-5°C to +55°C

2.85

2.95

3.05

—

3.15

3.25

3.35

—

V

3.1

3.2

Low Battery Detection Hysteresis

V_{LBO_HYS}

150

mV V_BATLow-to-High

Note 1: The value is ensured by design and not production tested.

2: The maximum available charge current is also limited by the value set at PROG1 input.

DS22090B-page 6

MCP73871

DC CHARACTERISTICS (CONTINUED)

Electrical Specifications: Unless otherwise indicated, all limits apply for V_IN= V_REG+ 0.3V to 6V, T_A= -40°C to +85°C.

Typical values are at +25°C, V_IN= [V_REG(typical) + 1.0V]

Parameters

Sym

Min

Typ

Max

Units

Conditions

PROG1 Input (PROG1)

Charge Impedance Range

PROG3 Input (PROG3)

Termination Impedance Range

PROG2 Input (PROG2)

Input High Voltage Level

Input Low Voltage Level

Input Leakage Current

Timer Enable (TE)

R_PROG

1

5

—

20

kΩ

R_PROG

100

V_IH

V_IL

I_LK

1.8

—

0.8

1

V

—

0.01

µA

V_PROG2= V_DD

Input High Voltage Level

Input Low Voltage Level

Input Leakage Current

Chip Enable (CE)

V_IH

V_IL

I_LK

1.8

—

0.8

1

V

Note 1

—

0.01

µA

V_TE= V_DD

Input High Voltage Level

Input Low Voltage Level

Input Leakage Current

Input Source Selection (SEL)

Input High Voltage Level

Input Low Voltage Level

Input Leakage Current

Thermistor Bias

V_IH

V_IL

I_LK

1.8

—

0.8

1

V

—

0.01

µA

V_CE= V_DD

V_IH

V_IL

I_LK

1.8

—

0.8

1

V

—

0.01

µA

V_SEL= V_DD

Thermistor Current Source

Thermistor Comparator

Upper Trip Threshold

I_THERM

47

50

53

µA

2 kΩ < R_THERM< 50 kΩ

V_T1Low-to-High

V_T2High-to-Low

V_T1

V_T1HYS

V_T2

1.20

—

1.24

-40

1.26

—

V

mV

V

Upper Trip Point Hysteresis

Lower Trip Threshold

0.23

—

0.25

40

0.27

—

Lower Trip Point Hysteresis

Thermal Shutdown

V_T2HYS

mV

Die Temperature

T_SD

—

150

10

—

°C

Die Temperature Hysteresis

T_SDHYS

Note 1: The value is ensured by design and not production tested.

2: The maximum available charge current is also limited by the value set at PROG1 input.

DS22090B-page 7

MCP73871

AC CHARACTERISTICS

Electrical Specifications: Unless otherwise indicated, all limits apply for V_IN= 4.6V to 6V.

Typical values are at +25°C, V_DD= [V_REG(typical) + 1.0V]

Parameters

UVLO Start Delay

Sym

Min

Typ

Max

Units

Conditions

V_DDLow-to-High

t_START

—

5

ms

Current Regulation

Transition Time Out of Precondition

Current Rise Time Out of Precondition

Precondition Comparator Filter Time

Termination Comparator Filter Time

Charge Comparator Filter Time

Thermistor Comparator Filter Time

Elapsed Timer

t_DELAY

t_RISE

t_PRECON

t_TERM

t_CHARGE

t_THERM

—

10

ms

V_BAT< V_PTHto V_BAT> V_PTH

I_OUTRising to 90% of I_REG

Average V_BATRise/Fall

Average I_OUTFalling

0.4

1.3

3.2

Average V_BATFalling

Average THERM Rise/Fall

Elapsed Timer Period

t_ELAPSED

—

0

—

Hours

3.6

5.4

7.2

4.0

6.0

8.0

4.4

6.6

8.8

Status Indicators

Status Output Turn-off

Status Output Turn-on

t_OFF

t_ON

—

500

µs

I_SINK= 1 mA to 0 mA

I_SINK= 0 mA to 1 mA

Note 1: Internal safety timer is tested base on internal oscillator frequency measurement.

TEMPERATURE SPECIFICATIONS

Electrical Specifications: Unless otherwise indicated, all limits apply for V_IN= 4.6V to 6V.

Typical values are at +25°C, V_DD= [V_REG(typical) + 1.0V]

Parameters

Temperature Ranges

Sym

Min

Typ

Max

Units

Conditions

Specified Temperature Range

Operating Temperature Range

Storage Temperature Range

T_A

T_J

T_A

-40

-65

—

+85

+125

+150

°C

Thermal Package Resistances

Thermal Resistance, 20LD-QFN, 4x4

θ_JA

—

35

—

°C/W

4-Layer JC51-7 Standard Board,

Natural Convection

DS22090B-page 8

MCP73871

2.0

TYPICAL PERFORMANCE CURVES

Note:

The graphs and tables provided following this note are a statistical summary based on a limited number of

samples and are provided for informational purposes only. The performance characteristics listed herein

are not tested or guaranteed. In some graphs or tables, the data presented may be outside the specified

operating range (e.g., outside specified power supply range) and therefore outside the warranted range.

Note: Unless otherwise indicated, V_IN= [V_REG(typical) + 1V], I_OUT= 10 mA and T_A= +25°C, Constant-voltage mode.

4.240

4.300

Temperature = +25°C

4.232

4.224

4.216

4.208

4.200

4.192

4.184

4.176

4.280

4.260

4.240

4.220

4.200

4.180

4.160

4.140

4.120

4.100

V

_DD= 5.2V

I_OUT= 900 mA

I_OUT= 500 mA

I_OUT= 100 mA

I_OUT= 10 mA

4.6

4.9

5.1

5.4

5.6

5.9

Charge Current (mA)

Supply Voltage (V)

FIGURE 2-1:

(V

Battery Regulation Voltage

FIGURE 2-4:

Battery Regulation Voltage (V ).

Charge Current (I

) vs.

OUT

) vs. Supply Voltage (V ).

BAT

DD

BAT

40.0

V_BAT= 4.2V

4.238

V_DD= Floating

35.0

30.0

25.0

20.0

15.0

10.0

4.230 I_OUT= 1000 mA

4.222

I_OUT= 500 mA

4.214

I_OUT= 100 mA

4.206

4.198

4.190

I_OUT= 10 mA

-45 -30 -15

0

15 30 45 60 75 90

-45 -30 -15

0

15 30 45 60 75 90

Ambient Temperature (°C)

Temperature (°C)

FIGURE 2-2:

(V

Battery Regulation Voltage

FIGURE 2-5:

Output Leakage Current

) vs. Ambient Temperature (T ).

(I

) vs. Ambient Temperature (T ).

BAT

A

DISCHARGE A

1000

35.0

V_DD= 5.2V

V_DD= V_BAT

900

800

700

600

500

400

300

200

100

0

Temperature = +25°C

30.0

25.0

20.0

15.0

10.0

5.0

0.0

1 2

3

4

5 6

7

8

9 1011121314151617181920

3.0

3.2

3.4

3.6

3.8

4.0

4.2

R

_PROG(kΩ)

Battery Voltage (V)

FIGURE 2-3:

Charge Current (I

) vs.

FIGURE 2-6:

Output Leakage Current

OUT

Programming Resistor (R

).

(I ) vs. Battery Regulation Voltage

PROG

DISCHARGE

(V

).

BAT

DS22090B-page 9

MCP73871

Note: Unless otherwise indicated, V_IN= [V_REG(typical) + 1V], I_OUT= 10 mA and T_A= +25°C, Constant-voltage mode.

110

108

106

104

102

100

98

35.0

30.0

25.0

20.0

15.0

10.0

5.0

V_DD= Floating

Temperature = +25°C

R_PROG= 10 kΩ

Temperature = +25°C

96

94

92

0.0

90

3.0

3.2

3.4

3.6

3.8

4.0

4.2

4.5

4.8

5.0

5.3

5.5

5.8

6.0

Battery Voltage (V)

Supply Voltage (V)

FIGURE 2-7:

Output Leakage Current

FIGURE 2-10:

Charge Current (I

) vs.

OUT

(I

) vs. Battery Voltage (V ).

Supply Voltage (V ).

DISCHARGE

BAT

DD

1100

1060

1020

980

940

900

860

820

780

740

700

1190

R_PROG= 1 kΩ

Temperature = +25°C

1160

1130

1100

1070

1040

1010

980

950

920

890

860

R_PROG= 1 kΩ

V_DD= 5.2V

830

800

-45 -30 -15

0

15 30 45 60 75 90

4.5

4.8

5.0

5.3

5.5

5.8

6.0

Supply Voltage (V)

Ambient Temperature (°C)

FIGURE 2-8:

Charge Current (I

) vs.

FIGURE 2-11:

Charge Current (I

) vs.

OUT

Supply Voltage (V ).

Ambient Temperature (T ).

DD

A

110

108

106

104

102

100

98

550

R_PROG= 2 kΩ

540

Temperature = +25°C

530

520

510

500

490

480

470

460

450

96

94

R_PROG= 10 kΩ

_DD= 5.2V

92

V

90

-45 -30 -15

0

15 30 45 60 75 90

4.5

4.8

5.0

5.3

5.5

5.8

6.0

Supply Voltage (V)

Ambient Temperature (°C)

FIGURE 2-9:

Charge Current (I

) vs.

FIGURE 2-12:

Charge Current (I

) vs.

OUT

Supply Voltage (V ).

Ambient Temperature (T ).

DD

A

DS22090B-page 10

MCP73871

Note: Unless otherwise indicated, V_IN= [V_REG(typical) + 1V], I_OUT= 10 mA and T_A= +25°C, Constant-voltage mode.

120

55

R_PROG= 20 kΩ

100

80

60

40

20

0

53

51

49

47

45

43

41

V

_DD= 5.2V

V_DD= 5.2V

R_PROG= 10 kΩ

-45 -30 -15

0

15

30

45

60

75

90

25

50

75

100

125

150

Ambient Temperature (°C)

FIGURE 2-13:

Charge Current (I

) vs.

FIGURE 2-16:

Charge Current (I

) vs.

OUT

Ambient Temperature (T ).

Junction Temperature (T ).

A

J

1200

1000

800

52.0

Temperature = +25°C

51.5

51.0

50.5

50.0

49.5

49.0

48.5

48.0

47.5

47.0

600

400

V_DD= 5.2V

200

R_PROG= 1 kΩ

0

25

50

75

100

125

150

4.6

4.8

5.0

5.2

5.4

5.6

5.8

6.0

Ambient Temperature (°C)

Supply Voltage (V)

FIGURE 2-14:

Charge Current (I

) vs.

FIGURE 2-17:

Thermistor Current (I

)

THERM

OUT

Junction Temperature (T ).

vs. Supply Voltage (V ).

J

DD

600

500

400

300

200

52.0

V_DD= 5.2V

51.5

51.0

50.5

50.0

49.5

49.0

48.5

48.0

47.5

47.0

100

0

V_DD= 5.2V

R_PROG= 2 kΩ

25

50

75

100

125

150

-45 -30 -15

0

15 30 45 60 75 90

Ambient Temperature (°C)

FIGURE 2-15:

Charge Current (I

) vs.

FIGURE 2-18:

Thermistor Current (I

)

THERM

OUT

Junction Temperature (T ).

vs. Ambient Temperature (T ).

J

A

DS22090B-page 11

MCP73871

Note: Unless otherwise indicated, V_IN= [V_REG(typical) + 1V], I_OUT= 10 mA and T_A= +25°C, Constant-voltage mode.

0

-10

-20

-30

-40

-50

-60

1.8

1.6

1.4

1.2

1

0.8

0.6

0.4

0.2

0

0.2

0.1

0

I_OUT= 100 mA

I_OUT= 10 mA

-0.1

-0.2

-0.3

-0.4

-0.5

-0.2

-0.001

0

0.001 0.002 0.003 0.004

0.01

0.1

1

10

100

1000

Frequency (kHz)

Time (s)

FIGURE 2-19:

Power Supply Ripple

FIGURE 2-22:

Load Transient Response.

Rejection (PSRR).

I

= 100 mA.

OUT

9

0.3

0.1

0.2

0.1

0

1.8

1.6

1.4

1.2

1

0.8

0.6

0.4

0.2

0

I_OUT= 100 mA

I_OUT= 500 mA

8.5

8

7.5

7

-0.1

-0.2

-0.3

-0.4

-0.5

-0.1

-0.3

-0.5

-0.7

6.5

6

5.5

5

-0.2

4.5

-0.0008 -0.0006 -0.0004 -0.0002

0

0.0002

Time (s)

FIGURE 2-20:

Line Transient Response.

FIGURE 2-23:

I = 500 mA.

OUT

Load Transient Response.

I

= 100 mA.

OUT

9

0.7

0.6

0.5

0.4

0.3

0.2

0.1

0

I_OUT= 500 mA

8.5

8

7.5

7

6.5

6

5.5

5

4.5

4

-0.0008 -0.0006 -0.0004 -0.0002

Time (s)

0

0.0002

Time (ms)

FIGURE 2-21:

= 500 mA.

Line Transient Response.

FIGURE 2-24:

Undervoltage Lockout.

I

OUT

DS22090B-page 12

MCP73871

Note: Unless otherwise indicated, V_IN= [V_REG(typical) + 1V], I_OUT= 10 mA and T_A= +25°C, Constant-voltage mode.

4.5

4

2

1.8

1.6

1.4

1.2

1

3.5

3

MCP73871

V_DD= 5.2V

R_PROG1= 1 kΩ

R_PROG3= 25 kΩ

2.5

2

0.8

0.6

0.4

0.2

0

1.5

1

0.5

0

10 20 30 40 50 60 70 80

Time (Minute)

Time (ms)

FIGURE 2-25:

Startup Delay.

FIGURE 2-27:

Complete Charge Cycle

(1000 mAh Li-Ion Battery).

4.5

4

0.5

0.4

0.3

0.2

0.1

0

4.5

4

2

1.8

1.6

1.4

1.2

1

3.5

3

3.5

3

MCP73871

V_DD= 5.2V

SEL = Low

PROG2 = Low

Preconditioning Threshold Voltage

2.5

2

2.5

Fast Charge (Constant Current)

MCP73871

2

0.8

0.6

0.4

0.2

0

1.5

1

1.5

V

_DD= 5.2V

1

R_PROG1= 1 kΩ

0.5

0

R_PROG3= 25 kΩ

0.5 Preconditioning

0

0.1

0.2

0.3

0.4

0.5

0

0.2

0.4

0.6

0.8

1

Time (Minute)

Time (Minutes)

FIGURE 2-26:

Complete Charge Cycle

FIGURE 2-28:

Typical Charge Profile in

(130 mAh Li-Ion Battery).

Preconditioning (1000 mAh Battery).

DS22090B-page 13

MCP73871

NOTES:

DS22090B-page 14

MCP73871

3.0

PIN DESCRIPTION

The descriptions of the pins are listed in Table 3-1.

TABLE 3-1:

PIN FUNCTION TABLES

Number

Symbol

I/O

Function

1, 20

OUT

VPCC

SEL

O

I

System Output Terminal

2

3

4

Voltage proportional charge control

I

Input type selection (Low for USB port, High for ac-dc adapter)

PROG2

I

USB port input current limit selection when SEL = Low.

(Low = 100 mA, High = 500 mA)

5

6

7

8

THERM

PG

I/O

O

Thermistor monitoring input and bias current

Power-Good Status Output (Open-Drain)

Charge Status Output 2 (Open-Drain)

STAT2

O

STAT1 /

LBO

O

Charge Status Output 1 (Open-Drain). Low battery output indicator when

V_BAT> V_IN

9

TE

I

Timer Enable; Enables Safety Timer when active Low

10, 11, EP

V_SS

—

Battery Management 0V Reference. EP (Exposed Thermal Pad); There is an

internal electrical connection between the exposed thermal pad and V_SS. The EP

must be connected to the same potential as the V_SSpin on the Printed Circuit

Board (PCB)

12

13

PROG3

PROG1

I/O

Termination set point for both ac-dc adapter and USB port

Fast charge current regulation setting with SEL = High. Preconditioning set point

for both USB port and ac-dc adapter.

14, 15

16

V_BAT

V_{BAT_SENSE}

CE

I/O

Battery Positive Input and Output connection

Battery Voltage Sense

I/O

17

I

Device Charge Enable; Enabled when CE = High

Power Supply Input.

18, 19

IN

Legend: I = Input, O = Output, I/O = Input/Output

Note: The input pins should always tie to either High or Low, and never allow floating to ensure operation properly.

3.1

Power Supply Input (IN)

3.3

Voltage Proportional Charge

Control (VPCC)

A

supply voltage of V_REG+ 0.3V to 6V is

recommended. Bypass to V_SSwith a minimum of

4.7 µF.

If the voltage on the IN pin drops to a preset value,

determined by the threshold established at the VPCC

input, due to a limited amount of input current or input

source impedance, the battery charging current is

reduced. Further demand from the system is supported

by the battery, if possible. To active this feature, simply

supply 1.23V or greater to VPCC pin. This feature can

be disabled by connecting the VPCC pin to IN.

3.2

System Output Terminal (OUT)

The MCP73871 device powers the system via output

terminals while independently charging the battery.

This feature reduces the charge and discharge cycles

on the battery, allows for proper charge termination and

the system to run with an absent or defective battery

pack. Also, this feature gives the system priority on

input power, allowing the system to power-up with

deeply depleted battery packs. Bypass to V_SSwith a

minimum of 4.7 µF is recommended.

For example, a system is designed with a 5.5V rated

DC power supply with ±0.5V tolerance. The worst

condition of 5V is selected, which is used to calculate

the VPCC supply voltage with divider.

DS22090B-page 15

MCP73871

The voltage divider equation is shown below:

3.8

Charge Current Regulation Set

(PROG1)

R₂

⎛

⎝

⎞

⎠

------------------

The maximum constant charge current is set by placing

a resistor from PROG1 to V_SS. PROG1 sets the

maximum constant charge current for both ac-dc

adapter and USB port. However, the actual charge

current is based on input source type and system load

requirement.

V_VPCC

=

× V_IN= 1.23V

R₁+ R₂

110kΩ

110kΩ + R₁

⎛

⎝

⎞

⎠

-----------------------------

1.23V =

× 5V

R₁= 337.2kΩ

3.9

USB-Port Current Regulation Set

(PROG2)

The calculated R₁equals to 337.2 kΩ when 110 kΩ is

selected for R₂. The 330 kΩ resistor is selected for R₁

to build the voltage divider for VPCC.

The MCP73871 device USB-Port current regulation set

input (PROG2) is a digital input selection. A logic Low

selects a 1 unit load input current from USB port

(100 mA); a logic High selects a 5 unit loads input

current from USB port (500 mA).

V_IN

330 kΩ

VPCC

3.10 Charge Status Output 1 (STAT1)

STAT1 is an open-drain logic output for connection to

an LED for charge status indication. Alternatively, a

pull-up resistor can be applied for interfacing to a host

microcontroller. Refer to Table 5-1 for a summary of the

status output during a charge cycle.

110 kΩ

FIGURE 3-1:

Voltage Divider Example.

3.11 Charge Status Output 2 (STAT2)

3.4

Input Source Type Selection (SEL)

STAT2 is an open-drain logic output for connection to

an LED for charge status indication. Alternatively, a

pull-up resistor can be applied for interfacing to a host

microcontroller. Refer to Table 5-1 for a summary of the

status output during a charge cycle.

The input source type selection (SEL) pin is used to

select input power source for input current limit control

feature. With the SEL input High, the MCP73871

device is designed to provide a typical 1.65A to system

power and charge Li-Ion battery from a regular 5V wall

adapter. The MCP73871 device limits the input current

up to 1.8A. When SEL active Low, the input source is

designed to provide system power and Li-Ion battery

charging from a USB Port input while adhering to the

current limits governed by the USB specification.

3.12 Power-Good (PG)

The power-good (PG) is an open-drain logic output for

input power supply indication. The PG output is low

whenever the input to the MCP73871 device is above

the UVLO threshold and greater than the battery

voltage. The PG output can be used as an indication to

the user via an illuminated LED or to the system via a

pull-up resistor for interfacing to a host microcontroller

that an input source other than the battery is supplying

power. Refer to Table 5-1 for a summary of the status

output during a charge cycle.

3.5

Battery Management 0V Reference

(V_SS)

Connect to negative terminal of battery, system load

and input supply.

3.6

Battery Charge Control Output

(V_BAT

)

3.13 Low Battery Output (LBO)

Connect to positive terminal of Li-Ion / Li-Polymer

batteries. Bypass to V_SSwith a minimum of 4.7 µF to

ensure loop stability when the battery is disconnected.

STAT1 also serves as low battery output (LBO) if the

selected MCP73871 is equipped with this feature. It

reminds the system or end user when the Li-Ion battery

voltage level is low. The LBO feature enables when the

system is running from the Li-Ion batteries. The LBO

indicator can be used as an indication to the user via lit

up LED or to the system via a pull-up resistor for

interfacing to a host microcontroller that an input

source other than the battery is supplying power. Refer

to Table 5-1 for a summary of the status output during

a charge cycle.

3.7

Battery Voltage Sense

(V_{BAT_SENSE}

)

Connect to positive terminal of battery. A precision

internal voltage sense regulates the final voltage on

this pin to V_REG

.

DS22090B-page 16

MCP73871

3.14 Timer Enable (TE)

3.16 Charge Enable (CE)

With the CE input Low, the Li-Ion battery charger

feature of the MCP73871 will be disabled. The charger

feature is enabled when CE is active High. Allowing the

CE pin to float during the charge cycle may cause

system instability. The CE input is compatible with 1.8V

logic. Refer to Section 6.0 “Applications” for various

applications in designing with CE features.

The timer enable (TE) feature is used to enable or

disable the internal timer. A low signal on this pin

enables the internal timer and a high signal disables

the internal timer. The TE input can be used to disable

the timer when the system load is substantially limiting

the available supply current to charge the battery. The

TE input is compatible with 1.8V logic.

3.17 Exposed Thermal Pad (EP)

Note:

The built-in safety timer is available for the

following options: 4 HR, 6 HR and 8 HR.

There is an internal electrical connection between the

Exposed Thermal Pad (EP) and the V_SSpin; they must

be connected to the same potential.

3.15 Battery Temperature Monitor

(THERM)

The MCP73871 device continuously monitor battery

temperature during a charge cycle by measuring the

voltage between the THERM and V_SSpins. An internal

50 µA current source provides the bias for most

common 10 kΩ negative-temperature coefficient

thermistors (NTC). The MCP73871 device compares

the voltage at the THERM pin to factory set thresholds

of 1.24V and 0.25V, typically. Once a voltage outside

the thresholds is detected during a charge cycle, the

MCP73871 device immediately suspends the charge

cycle. The charge cycle resumes when the voltage at

the THERM pin returns to the normal range. The

charge temperature window can be set by placing fixed

value resistors in series-parallel with a thermistor.

Refer to Section 6.0 “Applications” for calculations

of resistance values.

DS22090B-page 17

MCP73871

NOTES:

DS22090B-page 18

MCP73871

4.0

DEVICE OVERVIEW

The MCP73871 device is a simple, but fully integrated

linear charge management controllers with system

load sharing feature. Figure 4-1 depicts the

operational flow algorithm.

SHUTDOWN MODE *

* Continuously Monitored

V_DD< V_UVLO

V_DD< V_BAT

STAT1 = Hi-Z

STAT2 = Hi-Z

PG = Hi-Z

STANDBY MODE *

V_BAT> (V_REG+100 mV)

CE = LOW

LBO *

V_IN< V_BAT

STAT1 = LOW

STAT2 = Hi-Z

PG = Hi-Z

STAT1 = Hi-Z

STAT2 = Hi-Z

PG = LOW

V_BAT< V_PTH

PRECONDITIONING MODE

Charge Current = I_PREG

STAT1 = LOW

STAT2 = Hi-Z

PG = LOW

Timer Reset

V_BAT> V_PTH

FAST CHARGE MODE

TEMPERATURE FAULT

TIMER FAULT

No Charge Current

Charge Current = I_REG

STAT1 = LOW

STAT2 = LOW

PG = LOW

STAT1 = LOW

STAT2 = LOW

PG = LOW

STAT1 = LOW

STAT2 = Hi-Z

PG = LOW

Timer Expired

Timer Suspended

Timer Reset

Timer Enabled

CONSTANT VOLTAGE MODE

Charge Voltage = V_REG

STAT1 = LOW

STAT2 = Hi-Z

PG = LOW

I_BAT< I_TERM

Timer Expired

CHARGE COMPLETE MODE

No Charge Current

STAT1 = Hi-Z

STAT2 = LOW

PG = LOW

Timer Reset

FIGURE 4-1:

MCP73871 Device Flow Chart.

DS22090B-page 19

MCP73871

4.1

UnderVoltage Lockout (UVLO)

4.4

Preconditioning

An internal undervoltage lockout (UVLO) circuit

monitors the input voltage and keeps the charger in

shutdown mode until the input supply rises above the

UVLO threshold.

If the voltage at the V_BATpin is less than the

preconditioning threshold, the MCP73871 device

enters a preconditioning mode. The preconditioning

threshold is factory set. Refer to Section 1.0

“Electrical Characteristics” for preconditioning

threshold options.

In the event a battery is present when the input power

is applied, the input supply must rise approximately

100 mV above the battery voltage before the

MCP73871 device become operational.

In this mode, the MCP73871 device supplies 10% of

the fast charge current (established with the value of

the resistor connected to the PROG1 pin) to the

battery.

The UVLO circuit places the device in shutdown mode

if the input supply falls to approximately 100 mV of the

battery voltage.

When the voltage at the V_BATpin rises above the

preconditioning threshold, the MCP73871 device

enters the constant current (fast charge) mode.

The UVLO circuit is always active. At any time, the

input supply is below the UVLO threshold or

approximately 100 mV of the voltage at the V_BATpin,

the MCP73871 device is placed in a shutdown mode.

4.5

Constant Current Mode - Fast

Charge

During any UVLO condition, the battery reverse

discharge current shall be less than 2 µA.

During the constant current mode, the programmed

charge current is supplied to the battery or load. The

charge current is established using a single resistor

from PROG1 to V_SS. The program resistor and the

charge current are calculated using the following

equation:

4.2

System Load Sharing

The system load sharing feature gives the system

priority on input power, allowing the system to

power-up with deeply depleted battery packs.

With the SEL input active Low, the MCP73871 device

is designed to provide system power and Li-Ion battery

charging from a USB input while adhering to the current

limits governed by the USB specification.

EQUATION 4-1:

1000V

R_PROG1

I_REG= -------------------

Where:

With the SEL input active High, the MCP73871 device

limits the total supply current to 1.8A (system power

and charge current combined).

R_PROG

I_REG

=

kilo-ohms (kΩ)

milliampere (mA)

Constant current mode is maintained until the voltage

at the V_BATpin reaches the regulation voltage, V_REG

System

Direction

.

Power

Control

FET

0.2Ω

IN

OUT

When constant current mode is invoked, the internal

timer is reset.

Ideal

Diode,

Current

Limit

Synchronous

Switch

4.5.1

TIMER EXPIRED DURING

CONSTANT CURRENT - FAST

CHARGE MODE

Charge

Control

V

BAT

If the internal timer expires before the recharge voltage

threshold is reached, a timer fault is indicated and the

charge cycle terminates. The MCP73871 device

remains in this condition until the battery is removed. If

the battery is removed, the MCP73871 device enters

the Stand-by mode where it remains until a battery is

reinserted.

Charge

FET

Direction

Control

FIGURE 4-2:

System Load Sharing

Diagram.

4.3

Charge Qualification

4.6

Constant Voltage Mode

For a charge cycle to begin, all UVLO conditions must

be met and a battery or output load must be present.

When the voltage at the V_BATpin reaches the

regulation voltage, V_REG, constant voltage regulation

begins. The regulation voltage is factory set to 4.10V

or 4.20V with a tolerance of ±0.5%.

A charge current programming resistor must be

connected from PROG1 to V_SSwhen SEL = High.

When SEL = Low, PROG2 needs to tie to High or Low

for proper operation.

DS22090B-page 20

MCP73871

4.7

Charge Termination

4.9

Thermal Regulation

The charge cycle is terminated when, during constant

voltage mode, the average charge current diminishes

below a threshold established with the value of a

resistor connected from PROG3 to V_SSor internal timer

has expired. A 1 ms filter time on the termination

comparator ensures that transient load conditions do

not result in premature charge cycle termination. The

timer period is factory set and can be disabled. Refer to

Section 1.0 “Electrical Characteristics” for timer

period options.

The MCP73871 device limits the charge current based

on the die temperature. The thermal regulation

optimizes the charge cycle time while maintaining

device reliability. Figure 4-3 depicts the thermal

regulation for the MCP73871 device. Refer to

Section 1.0 “Electrical Characteristics” for thermal

package resistances and Section 6.1.1.2 “Thermal

Considerations” for calculating power dissipation.

.

1200

1000

800

The program resistor and the charge current are

calculated using the following equation:

EQUATION 4-2:

600

1000V

R_PROG3

I_TERMINATION= -------------------

400

Where:

V_DD= 5.2V

200

R

_PROG= 1 kΩ

R_PROG

I_REG

=

kilo-ohms (kΩ)

0

25

50

75

100

125

150

milliampere (mA)

Ambient Temperature (°C)

The charge current is latched off and the MCP73871

device enters charge complete mode. The

FIGURE 4-3:

Thermal Regulation

a

recommended PROG3 resistor values are between

5 kΩ and 100 kΩ.

4.10 Thermal Shutdown

The MCP73871 device suspends charge if the die

temperature exceeds 150°C. Charging will resume

when the die temperature has cooled by approximately

10°C. The thermal shutdown is a secondary safety

feature in the event that there is a failure within the

thermal regulation circuitry.

4.8

Automatic Recharge

The MCP73871 device continuously monitors the

voltage at the V_BATpin in the charge complete mode. If

the voltage drops below the recharge threshold,

another charge cycle begins and current is once again

supplied to the battery or load. The recharge threshold

is factory set. Refer to Section 1.0 “Electrical

Characteristics” for recharge threshold options.

4.11 Temperature Qualification

The MCP73871 device continuously monitor battery

temperature during a charge cycle by measuring the

voltage between the THERM and V_SSpins. An internal

50 µA current source provides the bias for most

common 10 kΩ negative-temperature coefficient

thermistors (NTC). The MCP73871 device compares

the voltage at the THERM pin to factory set thresholds

of 1.24V and 0.25V, typically. Once a voltage outside

the thresholds is detected during a charge cycle, the

MCP73871 device immediately suspends the charge

cycle. The MCP73871 device suspends charge by

turning off the charge pass transistor and holding the

timer value. The charge cycle resumes when the

voltage at the THERM pin returns to the normal range.

Note:

Charge termination and automatic

recharge features avoid constant charging

Li-Ion batteries to prolong life of Li-Ion

batteries while keeping their capacity at

healthy level.

DS22090B-page 21

MCP73871

4.12 Voltage Proportional Charge

Control (VPCC)

4.13 Input Current Limit Control (ICLC)

If the input current threshold is reached, then the

battery charging current is reduced. The ICLC tries to

reach a steady-state condition where the system load

has priority and the battery is charged with the

remaining current. No active control limits the current

to the system. Therefore, if the system demands more

current than the input can provide or the input ICLC is

reached, the ideal diode will become forward biased

and the battery is able to supplement the input current

to the system load.

If the voltage on the IN pin drops to a preset value,

determined by the threshold established at the VPCC

input, due to a limited amount of input current or input

source impedance, then the battery charging current is

reduced. The VPCC control tries to reach

a

steady-state condition where the system load has

priority and the battery is charged with the remaining

current. Therefore, if the system demands more

current than the input can provide, the ideal diode will

become forward biased and the battery is able to

supplement the input current to the system load.

The ICLC sustains the system load as its highest

priority. This is done by reducing the non-critical charge

current while adhering to the current limits governed by

the USB specification or the maximum ac-dc adapter

current supported. Further demand from the system is

supported by the battery, if possible.

The VPCC sustains the system load as its highest

priority. It does this by reducing the noncritical charge

current while maintaining the maximum power output of

the adapter. Further demand from the system is

supported by the battery, if possible.

The VPCC feature functions identically for USB port or

ac-dc adapter inputs. This feature can be disabled by

connecting the VPCC to IN pin.

700

600

500

400

Input Current

300

Battery Current

Load Current

200

100

0

Ideal

Diode

-100

-200

0

100 200 300 400 500 600 700

Load Current (mA)

FIGURE 4-4:

Input Current Limit Control -

USB Port.

DS22090B-page 22

MCP73871

1.24V and 0.25V, typically. Once a voltage outside the

thresholds is detected during a charge cycle, the

MCP73871 device immediately suspends the charge

cycle.

5.0

DETAILED DESCRIPTION

Analog Circuitry

5.1

The MCP73871 device suspends charge by turning off

the pass transistor and holding the timer value. The

charge cycle resumes when the voltage at the THERM

pin returns to the normal range.

5.1.1

LOAD SHARING AND LI-ION

BATTERY MANAGEMENT INPUT

SUPPLY (V )

IN

The V_INinput is the input supply to the MCP73871

device. The MCP73871 device can be supplied by

either AC Adapter (V_AC) or USB Port (V_USB) with SEL

pin. The MCP73871 device automatically powers the

system with the Li-Ion battery when the V_INinput is not

present.

If temperature monitoring is not required, place a

standard 10 kΩ resistor from THERM to V_SS

.

5.2

Digital Circuitry

5.2.1

STATUS INDICATORS AND

POWER-GOOD (PG)

5.1.2

FAST CHARGE CURRENT

REGULATION SET (PROG1)

The charge status outputs have two different states:

Low (L), and High Impedance (Hi-Z). The charge status

outputs can be used to illuminate LEDs. Optionally, the

charge status outputs can be used as an interface to a

host microcontroller. Table 5-1 summarizes the state of

the status outputs during a charge cycle.

For the MCP73871 device, the charge current

regulation can be scaled by placing a programming

resistor (R_PROG1) from the PROG1 pin to V_SS. The

program resistor and the charge current are calculated

using the following equation:

EQUATION 5-1:

TABLE 5-1:

STATUS OUTPUTS

1000V

R_PROG1

CHARGE CYCLE STATE

STAT1 STAT2

PG

I_REG= -------------------

Shutdown (V_DD= V_BAT

Shutdown (V_DD= IN)

Preconditioning

)

Hi-Z

L

Hi-Z

L

Hi-Z

L

Where:

R_PROG

I_REG

=

kilo-ohms (kΩ)

L

milliampere (mA)

Constant Current

Constant Voltage

L

The fast charge current is set for maximum charge

current from ac-dc adapter and USB port. The

preconditioning current is 10% (0.1C) to the fast

charge current.

Charge Complete - Standby

Temperature Fault

Timer Fault

Hi-Z

L

Low Battery Output

No Battery Present

No Input Power Present

L

Hi-Z

L

5.1.3

BATTERY CHARGE CONTROL

OUTPUT (V

Hi-Z

)

Hi-Z

BAT

The battery charge control output is the drain terminal

of an internal P-channel MOSFET. The MCP73871

device provides constant current and voltage

regulation to the battery pack by controlling this

MOSFET in the linear region. The battery charge

control output should be connected to the positive

terminal of the battery pack.

5.2.2

AC-DC ADAPTER AND USB PORT

POWER SOURCE REGULATION

SELECT (SEL)

With the SEL input Low, the MCP73871 device is

designed to provide system power and Li-Ion battery

charging from a USB input while adhering to the current

limits governed by the USB specification. The host

microcontroller has the option selecting either a

100 mA (L) or a 500 mA (H) current limit based on the

PROG2 input. With the SEL input High, the MCP73871

device limits the input current to 1.8A. The

programmed charge current is established using a

single resistor from PROG1 to V_SSwhen driving SEL

High.

5.1.4

TEMPERATURE QUALIFICATION

(THERM)

The MCP73871 device continuously monitors battery

temperature during a charge cycle by measuring the

voltage between the THERM and V_SSpins. An internal

50 µA current source provides the bias for most

common 10 kΩ negative-temperature coefficient

(NTC) or positive-temperature coefficient (PTC)

thermistors.The current source is controlled, avoiding

measurement sensitivity to fluctuations in the supply

voltage (V_DD). The MCP73871 device compares the

voltage at the THERM pin to factory set thresholds of

DS22090B-page 23

MCP73871

5.2.3

USB PORT CURRENT

REGULATION SELECT (PROG2)

5.2.5

TIMER ENABLE (TE) OPTION

The timer enable (TE) input option is used to enable or

disable the internal timer. A low signal on this pin

enables the internal timer and a high signal disables

the internal timer. The TE input can be used to disable

the timer when the charger is supplying current to

charge the battery and power the system load. The TE

input is compatible with 1.8V logic.

Driving the PROG2 input to a logic Low selects the low

USB port source current setting (maximum 100 mA).

Driving the PROG2 input to a logic High selects the

high USB port source current setting (Maximum

500 mA).

5.2.4

POWER-GOOD (PG)

The power-good (PG) option is a pseudo open-drain

output. The PG output can sink current, but not source

current. However, there is a diode path back to the

input, and as such, the output should only be pulled up

to the input. The PG output is low whenever the input

to the MCP73871 device is above the UVLO threshold

and greater than the battery voltage. The PG output

can be used as an indication to the system that an input

source other than the battery is supplying power.

DS22090B-page 24

MCP73871

and Lithium-Polymer cells Constant-current followed

by Constant-voltage. Figure 6-1 depicts a typical

stand-alone MCP73871 application circuit, while

Figures 6-2 and 6-3 depict the accompanying charge

profile.

6.0

APPLICATIONS

The MCP73871 device is designed to operate in

conjunction with host microcontroller or in

stand-alone applications. The MCP73871 device

provides the preferred charge algorithm for Lithium-Ion

a

MCP73871 Device Typical Application

5V AC-DC Adapter

or

USB Port

18, 19

1, 20

System

Load

IN

OUT

V_BAT

10 µF

4.7 µF

14, 15, 16

470Ω

6

PG

470Ω

7

8

4.7 µF

STAT2

NTC

THERM 5

PROG1

STAT1

LBO

330 kΩ

110 kΩ

10 kΩ

Single-Cell

Li-Ion Battery

2

3

R_PROG1

VPCC

SEL

13

Hi

Low

R_PROG3

12

4

PROG3

PROG2

TE

9

Hi

Low

17

V_SS10, 11, EP

CE

FIGURE 6-1:

MCP73871Typical Stand-Alone Application Circuit with VPCC.

4.5

2

4.5

4

2

1.8

1.6

1.4

1.8

1.6

1.4

1.2

1

4

3.5

3

Preconditioning Threshold Voltage

1.2

1

MCP73871

V_DD= 5.2V

R_PROG1= 1 kΩ

R_PROG3= 25 kΩ

2.5

2

Fast Charge (Constant Current)

MCP73871

2

0.8

0.6

0.4

0.2

0

0.8

0.6

0.4

0.2

0

1.5

1

1.5

V

_DD= 5.2V

1

R_PROG1= 1 kΩ

R_PROG3= 25 kΩ

0.5

0

0.5 Preconditioning

0

10 20 30 40 50 60 70 80

Time (Minute)

0

0.2

0.4

0.6

0.8

1

Time (Minute)

FIGURE 6-2:

Typical Charge Profile

FIGURE 6-3:

Typical Charge Profile in

(1000 mAh Battery).

Preconditioning (1000 mAh Battery).

DS22090B-page 25

MCP73871

This power dissipation with the battery charger in the

QFN-20 package will cause thermal regulation to be

entered as depicted. Alternatively, the 4 mm x 4 mm

DFN package could be utilized to reduce heat by

adding vias on the exposed pad.

6.1

Application Circuit Design

Due to the low efficiency of linear charging, the most

important factors are thermal design and cost, which

are a direct function of the input voltage, output current

and thermal impedance between the battery charger

and the ambient cooling air. The worst-case situation is

when the device has transitioned from the

Preconditioning mode to the Constant Current mode. In

this situation, the battery charger has to dissipate the

maximum power. A trade-off must be made between

the charge current, cost and thermal requirements of

the charger.

6.1.1.3

External Capacitors

The MCP73871 device is stable with or without a

battery load. In order to maintain good AC stability in

the Constant Voltage mode, a minimum capacitance of

4.7 µF is recommended to bypass the V_BATpin to V_SS

.

This capacitance provides compensation when there is

no battery load. In addition, the battery and

interconnections appear inductive at high frequencies.

These elements are in the control feedback loop during

Constant Voltage mode. Therefore, the bypass

capacitance may be necessary to compensate for the

inductive nature of the battery pack.

6.1.1

COMPONENT SELECTION

Selection of the external components in Figure 6-1 is

crucial to the integrity and reliability of the charging

system. The following discussion is intended as a guide

for the component selection process.

Virtually any good quality output filter capacitor can be

used, independent of the capacitor’s minimum

Effective Series Resistance (ESR) value. The actual

value of the capacitor (and its associated ESR)

depends on the output load current. A 4.7 µF ceramic,

tantalum or aluminum electrolytic capacitor at the

output is usually sufficient to ensure stability for charge

currents up to a 1000 mA.

6.1.1.1

Charge Current

The preferred fast charge current for Lithium-Ion cells

should always follow references and guidances from

battery manufacturers. For example, a 1000 mAh

battery pack has a preferred fast charge current of

0.7C. Charging at 700 mA provides the shortest charge

cycle times without degradation to the battery pack

performance or life.

6.1.1.4

Reverse-Blocking Protection

The MCP73871 device provides protection from a

faulted or shorted input. Without the protection, a

faulted or shorted input would discharge the battery

pack through the body diode of the internal pass

transistor.

6.1.1.2

Thermal Considerations

The worst-case power dissipation in the battery

charger occurs when the input voltage is at the

maximum and the device has transitioned from the

Preconditioning mode to the Constant-current mode. In

this case, the power dissipation is:

6.1.1.5

Temperature Monitoring

The charge temperature window can be set by placing

fixed value resistors in series-parallel with a thermistor.

The resistance values of R_T1and R_T2can be calculated

with the following equations in order to set the

temperature window of interest.

EQUATION 6-1:

PowerDissipation = (V

– V

) × I

PTHMIN REGMAX

DDMAX

Where:

V_DDMAX

I_REGMAX

V_PTHMIN

=

the maximum input voltage

For NTC thermistors:

the maximum fast charge current

EQUATION 6-2:

the minimum transition threshold

voltage

R_T2× R_COLD

24kΩ = R_T1+ --------------------------------

R

_T2+ R_COLD

For example, power dissipation with a 5V, ±10% input

voltage source and 500 mA, ±10% fast charge current

is:

R_T2× R_HOT

5kΩ = R_T1+ ----------------------------

_T2+ R_HOT

R

Where:

R_T1

EXAMPLE 6-1:

=

the fixed series resistance

the fixed parallel resistance

R_T2

PowerDissipation = (5.5V – 2.7V) × 550mA = 1.54W

R_COLD

the thermistor resistance at the

lower temperature of interest

R_HOT

=

the thermistor resistance at the

upper temperature of interest

DS22090B-page 26

MCP73871

For example, by utilizing a 10 kΩ at 25°C NTC

thermistor with a sensitivity index, β, of 3892, the

charge temperature range can be set to 0°C - 50°C by

placing a 1.54 kΩ resistor in series (R_T1), and a

69.8 kΩ resistor in parallel (R_T2) with the thermistor.

6.2

PCB Layout Issues

For optimum voltage regulation, place the battery pack

as close as possible to the device’s V_BATand V_SSpins,

recommended to minimize voltage drops along the

high current-carrying PCB traces.

6.1.1.6

Charge Status Interface

If the PCB layout is used as a heatsink, adding many

vias in the heatsink pad can help conduct more heat to

the backplane of the PCB, thus reducing the maximum

junction temperature.

A status output provides information on the state of

charge. The output can be used to illuminate external

LEDs or interface to a host microcontroller. Refer to

Table 5-1 for a summary of the state of the status

output during a charge cycle.

6.1.1.7

System Load Current

The preferred discharge current for Lithium-Ion cells

should always follow references and guidance from

battery manufacturers. Due to the safety concerns

when using Lithium-Ion batteries and power

dissipation of linear solutions, the system load when

design with the MCP73871 device is recommended to

be less than 1A or the maximum discharge rate of the

selected Lithium-Ion cell. Whichever is smaller is

recommended.

The idea diode between V_BATand OUT is designed to

drive a maximum current up to 2A. The built-in thermal

shutdown protection may turn the MCP73871 device

off with high current.

DS22090B-page 27

MCP73871

NOTES:

DS22090B-page 28

MCP73871

7.0

7.1

PACKAGING

Package Marking Information

20-Lead QFN

Example:

Marking

Code

Marking

Code

Part Number *

XXXXX

XXXXXX

YWWNNN

73871

1AA

MCP73871-1AAI/ML

MCP73871-1CAI/ML

MCP73871-1CCI/ML

MCP73871-2AAI/ML

MCP73871-2CAI/ML

MCP73871-2CCI/ML

MCP73871-3CAI/ML

MCP73871-3CCI/ML

MCP73871-4CAI/ML

MCP73871-4CCI/ML

1AA

1CA

1CC

2AA

2CA

2CC

3CA

3CC

4CA

4CC

MCP73871T-1AAI/ML

MCP73871T-1CAI/ML

MCP73871T-1CCI/ML

MCP73871T-2AAI/ML

MCP73871T-2CAI/ML

MCP73871T-2CCI/ML

MCP73871T-3CAI/ML

MCP73871T-3CCI/ML

MCP73871T-4CAI/ML

MCP73871T-4CCI/ML

1AA

1CA

1CC

2AA

2CA

2CC

3CA

3CC

4CA

4CC

e

3

I/ML^^

919256

* Consult Factory for Alternative Device Options.

Legend: XX...X Customer-specific information

Y

YY

WW

NNN

Year code (last digit of calendar year)

Year code (last 2 digits of calendar year)

Week code (week of January 1 is week ‘01’)

Alphanumeric traceability code

e

3

Pb-free JEDEC designator for Matte Tin (Sn)

*

This package is Pb-free. The Pb-free JEDEC designator (

can be found on the outer packaging for this package.

)

e3

Note: In the event the full Microchip part number cannot be marked on one line, it will

be carried over to the next line, thus limiting the number of available

characters for customer-specific information.

DS22090B-page 29

MCP73871

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DS22090B-page 30

MCP73871

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DS22090B-page 31

MCP73871

NOTES:

DS22090B-page 32

MCP73871

APPENDIX A: REVISION HISTORY

Revision B (May 2009)

The following is the list of modifications:

1. Updated the QFN-20 package drawing.

2. Updated Equation 4-1.

3. Updated Section 4.7 “Charge Termination”

and Equation 4-2.

4. Updated Equation 5-1.

Revision A (July 2008)

• Original Release of this Document.

DS22090B-page 33

MCP73871

NOTES:

DS22090B-page 34

MCP73871

PRODUCT IDENTIFICATION SYSTEM

To order or obtain information, e.g., on pricing or delivery, refer to the factory or the listed sales office.

Examples: * *

PART NO.

Device

XX

X/

XX

a)

b)

c)

d)

e)

f)

MCP73871-1AAI/ML: 4.10V PPM Battery

Output Temp. Package

Options*

Charger, 20LD QFN

pkg.

MCP73871-1CAI/ML: 4.10V, PPM Battery

Charger, 20LD QFN

pkg.

Device:

MCP73871: USB/AC Battery Charger with PPM

MCP73871T: USB/AC Battery Charger with PPM

(Tape and Reel)

MCP73871-1CCI/ML: 4.10V, PPM Battery

Charger, 20LD QFN

pkg.

Output Options * *

* Refer to table below for different operational options.

* * Consult Factory for Alternative Device Options.

MCP73871-2AAI/ML: 4.20V, PPM Battery

Charger, 20LD QFN

pkg.

MCP73871-2CAI/ML: 4.20V PPM Battery

Temperature:

I

=

-40°C to +85°C

Charger, 20LD QFN

pkg.

MCP73871-2CCI/ML: 4.20V PPM Battery

Package Type:

ML

Plastic Quad Flat No Lead (QFN)

(4x4x0.9 mm Body), 20-lead

Charger, 20LD QFN

pkg.

g)

h)

MCP73871-3CAI/ML: 4.35V PPM Battery

Charger, 20LD QFN

pkg.

MCP73871-3CCI/ML: 4.35V PPM Battery

Charger, 20LD QFN

pkg.

* * Consult Factory for Alternative Device Options

* Operational Output Options

Output

Options

Safety Timer

Duration (Hours)

LBO Voltage

Threshold (V)

V_REG

1AA

1CA

1CC

2AA

2CA

2CC

3CA

3CC

4CA

4CC

4.10V

4.20V

4.35V

4.40V

Disable

Disabled

3.1

6

Disable

Disabled

3.1

6

Disabled

3.1

Disabled

3.1

* * Consult Factory for Alternative Device Options.

DS22090B-page 35

MCP73871

NOTES:

DS22090B-page 36

Note the following details of the code protection feature on Microchip devices:

•

Microchip products meet the specification contained in their particular Microchip Data Sheet.

•

Microchip believes that its family of products is one of the most secure families of its kind on the market today, when used in the

intended manner and under normal conditions.

•

There are dishonest and possibly illegal methods used to breach the code protection feature. All of these methods, to our

knowledge, require using the Microchip products in a manner outside the operating specifications contained in Microchip’s Data

Sheets. Most likely, the person doing so is engaged in theft of intellectual property.

•

Microchip is willing to work with the customer who is concerned about the integrity of their code.

Neither Microchip nor any other semiconductor manufacturer can guarantee the security of their code. Code protection does not

mean that we are guaranteeing the product as “unbreakable.”

Code protection is constantly evolving. We at Microchip are committed to continuously improving the code protection features of our

products. Attempts to break Microchip’s code protection feature may be a violation of the Digital Millennium Copyright Act. If such acts

allow unauthorized access to your software or other copyrighted work, you may have a right to sue for relief under that Act.

Information contained in this publication regarding device

applications and the like is provided only for your convenience

and may be superseded by updates. It is your responsibility to

ensure that your application meets with your specifications.

MICROCHIP MAKES NO REPRESENTATIONS OR

WARRANTIES OF ANY KIND WHETHER EXPRESS OR

IMPLIED, WRITTEN OR ORAL, STATUTORY OR

OTHERWISE, RELATED TO THE INFORMATION,

INCLUDING BUT NOT LIMITED TO ITS CONDITION,

QUALITY, PERFORMANCE, MERCHANTABILITY OR

FITNESS FOR PURPOSE. Microchip disclaims all liability

arising from this information and its use. Use of Microchip

devices in life support and/or safety applications is entirely at

the buyer’s risk, and the buyer agrees to defend, indemnify and

hold harmless Microchip from any and all damages, claims,

suits, or expenses resulting from such use. No licenses are

conveyed, implicitly or otherwise, under any Microchip

intellectual property rights.

Trademarks

The Microchip name and logo, the Microchip logo, Accuron,

dsPIC, KEELOQ, KEELOQ logo, MPLAB, PIC, PICmicro,

PICSTART, rfPIC, SmartShunt and UNI/O are registered

trademarks of Microchip Technology Incorporated in the

U.S.A. and other countries.

FilterLab, Hampshire, Linear Active Thermistor, MXDEV,

MXLAB, SEEVAL, SmartSensor and The Embedded Control

Solutions Company are registered trademarks of Microchip

Technology Incorporated in the U.S.A.

Analog-for-the-Digital Age, Application Maestro, CodeGuard,

dsPICDEM, dsPICDEM.net, dsPICworks, dsSPEAK, ECAN,

ECONOMONITOR, FanSense, In-Circuit Serial

Programming, ICSP, ICEPIC, Mindi, MiWi, MPASM, MPLAB

Certified logo, MPLIB, MPLINK, mTouch, nanoWatt XLP,

PICkit, PICDEM, PICDEM.net, PICtail, PIC³²logo, PowerCal,

PowerInfo, PowerMate, PowerTool, REAL ICE, rfLAB, Select

Mode, Total Endurance, TSHARC, WiperLock and ZENA are

trademarks of Microchip Technology Incorporated in the

U.S.A. and other countries.

SQTP is a service mark of Microchip Technology Incorporated

in the U.S.A.

All other trademarks mentioned herein are property of their

respective companies.

Printed on recycled paper.

Microchip received ISO/TS-16949:2002 certification for its worldwide

headquarters, design and wafer fabrication facilities in Chandler and

Tempe, Arizona; Gresham, Oregon and design centers in California

and India. The Company’s quality system processes and procedures

are for its PIC^®MCUs and dsPIC^®DSCs, KEELOQ^®code hopping

devices, Serial EEPROMs, microperipherals, nonvolatile memory and

analog products. In addition, Microchip’s quality system for the design

and manufacture of development systems is ISO 9001:2000 certified.

DS22090B-page 37

WORLDWIDE SALES AND SERVICE

AMERICAS

ASIA/PACIFIC

EUROPE

Corporate Office

Asia Pacific Office

Suites 3707-14, 37th Floor

Tower 6, The Gateway

Harbour City, Kowloon

Hong Kong

Tel: 852-2401-1200

Fax: 852-2401-3431

India - Bangalore

Tel: 91-80-3090-4444

Fax: 91-80-3090-4080

Austria - Wels

Tel: 43-7242-2244-39

Fax: 43-7242-2244-393

2355 West Chandler Blvd.

Chandler, AZ 85224-6199

Tel: 480-792-7200

Fax: 480-792-7277

Technical Support:

http://support.microchip.com

Web Address:

www.microchip.com

Denmark - Copenhagen

Tel: 45-4450-2828

Fax: 45-4485-2829

India - New Delhi

Tel: 91-11-4160-8631

Fax: 91-11-4160-8632

France - Paris

Tel: 33-1-69-53-63-20

Fax: 33-1-69-30-90-79

India - Pune

Tel: 91-20-2566-1512

Fax: 91-20-2566-1513

Australia - Sydney

Tel: 61-2-9868-6733

Fax: 61-2-9868-6755

Atlanta

Duluth, GA

Tel: 678-957-9614

Fax: 678-957-1455

Germany - Munich

Tel: 49-89-627-144-0

Fax: 49-89-627-144-44

Japan - Yokohama

Tel: 81-45-471- 6166

Fax: 81-45-471-6122

China - Beijing

Tel: 86-10-8528-2100

Fax: 86-10-8528-2104

Italy - Milan

Tel: 39-0331-742611

Fax: 39-0331-466781

Korea - Daegu

Tel: 82-53-744-4301

Fax: 82-53-744-4302

Boston

China - Chengdu

Tel: 86-28-8665-5511

Fax: 86-28-8665-7889

Westborough, MA

Tel: 774-760-0087

Fax: 774-760-0088

Netherlands - Drunen

Tel: 31-416-690399

Fax: 31-416-690340

Korea - Seoul

China - Hong Kong SAR

Tel: 852-2401-1200

Fax: 852-2401-3431

Tel: 82-2-554-7200

Fax: 82-2-558-5932 or

82-2-558-5934

Chicago

Itasca, IL

Tel: 630-285-0071

Fax: 630-285-0075

Spain - Madrid

Tel: 34-91-708-08-90

Fax: 34-91-708-08-91

China - Nanjing

Tel: 86-25-8473-2460

Fax: 86-25-8473-2470

Malaysia - Kuala Lumpur

Tel: 60-3-6201-9857

Fax: 60-3-6201-9859

Cleveland

UK - Wokingham

Tel: 44-118-921-5869

Fax: 44-118-921-5820

Independence, OH

Tel: 216-447-0464

Fax: 216-447-0643

China - Qingdao

Tel: 86-532-8502-7355

Fax: 86-532-8502-7205

Malaysia - Penang

Tel: 60-4-227-8870

Fax: 60-4-227-4068

Dallas

Addison, TX

Tel: 972-818-7423

Fax: 972-818-2924

China - Shanghai

Tel: 86-21-5407-5533

Fax: 86-21-5407-5066

Philippines - Manila

Tel: 63-2-634-9065

Fax: 63-2-634-9069

Detroit

China - Shenyang

Tel: 86-24-2334-2829

Fax: 86-24-2334-2393

Singapore

Tel: 65-6334-8870

Fax: 65-6334-8850

Farmington Hills, MI

Tel: 248-538-2250

Fax: 248-538-2260

China - Shenzhen

Tel: 86-755-8203-2660

Fax: 86-755-8203-1760

Taiwan - Hsin Chu

Tel: 886-3-6578-300

Fax: 886-3-6578-370

Kokomo

Kokomo, IN

Tel: 765-864-8360

Fax: 765-864-8387

China - Wuhan

Tel: 86-27-5980-5300

Fax: 86-27-5980-5118

Taiwan - Kaohsiung

Tel: 886-7-536-4818

Fax: 886-7-536-4803

Los Angeles

Mission Viejo, CA

Tel: 949-462-9523

Fax: 949-462-9608

China - Xiamen

Tel: 86-592-2388138

Fax: 86-592-2388130

Taiwan - Taipei

Tel: 886-2-2500-6610

Fax: 886-2-2508-0102

Santa Clara

China - Xian

Tel: 86-29-8833-7252

Fax: 86-29-8833-7256

Thailand - Bangkok

Tel: 66-2-694-1351

Fax: 66-2-694-1350

Santa Clara, CA

Tel: 408-961-6444

Fax: 408-961-6445

China - Zhuhai

Tel: 86-756-3210040

Fax: 86-756-3210049

Toronto

Mississauga, Ontario,

Canada

Tel: 905-673-0699

Fax: 905-673-6509

03/26/09

DS22090B-page 38


型号：	MCP73871T-1CAI/ML
厂家：	MICROCHIP
描述：	Stand-Alone System Load Sharing and Li-Ion / Li-Polymer Battery Charge Management Controller 独立的系统负载分担与锂离子/锂聚合物电池充电管理控制器电源电路电池电源管理电路控制器
文件：	总38页 (文件大小：670K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

MCP73871T-1CAI/ML [MICROCHIP]

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