MCP738376SIUN_技术文档

MCP73837/8

Advanced Stand-Alone Li-Ion / Li-Polymer Battery Charge

Management Controller with Autonomous AC-Adapter or

USB-Port Source Selection

Features

Applications

• High Accuracy Preset Voltage Regulation: + 0.5%

• Available Voltage Regulation Options:

- 4.20V, 4.35V, 4.4V, or 4.5V

• Smart Phones and Personal Data Assistants

(PDA)

• Portable Media Players(PMP)

• Ultra Mobile Devices(UMD)

• Digital Cameras

• Complete Linear Charge Management Controller:

- Autonomous Power Source Selection

- Integrated Pass Transistors

• MP3 Players

• Bluetooth Headsets

- Integrated Current Sense

• Handheld Medical Devices

• AC/USB Dual Source Li-Ion Battery Chargers

- Integrated Reverse Discharge Protection

• Constant Current (CC) / Constant Voltage (CV)

Operation with Thermal Regulation

Description

• Selectable USB-Port Charge Current:

- Low: 1 Unit Load / High: 5 Unit Loads

• Programmable AC-Adapter Charge Current:

- 15 mA - 1000 mA

The MCP73837 and MCP73838 devices are fully

integrated linear Li-Ion / Li-Polymer battery chargers

with autonomous power source selection. Along with its

small physical size, the low number of external

components required makes the MCP73837/8 ideally

suitable for portable applications.

• Two Charge Status Outputs

• Power-Good Monitor: MCP73837

• Timer Enable: MCP73838

The MCP73837/8 automatically selects the USB-Port

or AC-Adapter as the power source for the system. For

the USB-Port powered systems, the MCP73837/8

specifically adheres to the current limits governed by

the USB specification. The host microcontroller can

select from two preset maximum charge current rates

of 100 mA (low power USB-port) or 500 mA (high

power USB-port). With an AC-Adapter providing power

to the system, an external resistor sets the magnitude

of the system or charge current up to a maximum of 1A.

• Automatic Recharge:

- Selectable Voltage Threshold

• Automatic End-of-Charge Control:

- Selectable Charge Termination Current Ratio

- Selectable Safety Timer Period

• Preconditioning of Deeply Depleted Cells - can be

disabled

• Battery Cell Temperature Monitor

• UVLO (Undervoltage Lockout)

The MCP73837/8 employs a constant current /

constant voltage charge algorithm with selectable

preconditioning and charge termination. The constant

voltage regulation is fixed with four available options:

4.20V, 4.35V, 4.40V, or 4.50V, to accommodated the

new emerging battery charging requirements. The

MCP73837/8 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 the device

reliability.

• Automatic Power-Down when Input Power is

Removed

• Low-Dropout (LDO) Linear Regulator Mode

• Numerous Selectable Options Available for a

Variety of Applications:

- Refer to Section 1.0 “Electrical

Characteristics” for Selectable Options”

- Refer to the “Product Identification

System” for Standard Options

• Temperature Range: -40°C to 85°C

• Packaging:

The MCP73837/8 are fully specified over the ambient

temperature range of -40°C to +85°C.

- 10-Lead 3 mm x 3 mm DFN

The MCP73837/8 devices are available in a 10-Lead,

3 mm x 3 mm, DFN package or in a 10-Lead MSOP

package.

- 10-Lead MSOP*

* Consult Factory for MSOP Package

Availability.

DS22071A-page 1

MCP73837/8

Package Types

MCP73837/8

10-Lead DFN 3 mm x 3 mm

MCP73837/8

10-Lead MSOP

V_BAT

V_AC

V_BAT

1

2

1

2

3

4

5

10

9

10

9

V_USB

THERM

PG (TE)

PROG2

PROG1

THERM

PG (TE)

PROG2

STAT1 3

STAT2 4

8

STAT1

STAT2

V_SS

7

V_SS

5

6

PROG1

Typical Applications

MCP73837 Typical Application

1

10

Ac-dc Adapter

V

BAT

AC

Thermsitor

9

4.7 µF

Single

Li-Ion

Cell

2

3

USB Port

4.7 µF

V

THERM

USB

4.7 µF

1 kΩ

5

V

STAT1

SS

1 kΩ

4

8

7

6

STAT2

PG

PROG2

PROG1

Hi

Low

R

PROG

MCP73838 Typical Application

1

10

Ac-dc Adapter

V

BAT

AC

Thermsitor

9

4.7 µF

2

3

USB Port

4.7 µF

V

THERM

TE

USB

Cell

4.7 µF

1KΩ

8

STAT1

STAT2

Hi

Low

4

5

7

6

PROG2

PROG1

V

SS

R

PROG

DS22071A-page 2

MCP73837/8

Functional Block Diagram (MCP73837/8)

VO

REG

DIRECTION

CONTROL

6 µA

V

BAT

USB

SENSEFET

G=0.001

100 mA/500 mA

10k

2k

SENSEFET

G=0.001

VO

REG

DIRECTION

CONTROL

V

AC/USB

AC

CURRENT

LIMIT

+

-

SENSEFET

G=0.001

1k

V

REF

SENSEFET

G=0.001

PROG1

AC/USB

111k

CA

+

-

REFERENCE,

BIAS, UVLO,

AND SHDN

V

(1.21V)

REF

310k

10k

+

-

VO

UVLO

REG

72.7k

-

470.6k

48k

PRECONDITION

+

TERM

-

PROG2

STAT1

+

CHARGE

6k

CHARGE

CONTROL,

TIMER,

AND

VA

+

-

157.3k

STATUS

LOGIC

VO

REG

STAT2

+

-

LDO

175k

PG (TE)

+

-

50 µA

HTVT

LTVT

470.6k

121k

THERM

+

-

175k

V

SS

1M

DS22071A-page 3

MCP73837/8

† 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

_DDN................................................................................7.0V

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

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

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

ESD protection on all pins

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

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

DC CHARACTERISTICS

Electrical Specifications: Unless otherwise indicated, all limits apply for V_DD= [V_REG(typical) + 0.3V] to 6V,

T_A= -40°C to +85°C. Typical values are at +25°C, V_DD= [V_REG(typical) + 1.0V]

Parameters

Supply Input

Sym

Min

Typ

Max

Units

Conditions

Supply Voltage

V_DD

I_SS

V_REG(Typ)

+0.3V

—

6

V

Note 1

Supply Current

—

1900

110

75

3000

300

100

5

µA

Charging

Charge Complete, No Battery

Standby (PROG Floating)

—

0.6

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

3.35

3.25

—

3.45

3.35

75

3.55

3.45

—

V

V_DD= Low to High (USB-Port)

V_DD= High to Low (USB-Port)

mV (USB-Port)

UVLO Start Threshold

UVLO Stop Threshold

UVLO Hysteresis

V_START

V_STOP

V_HYS

4.1

4.0

—

4.15

4.1

4.3

4.2

—

V

(AC-Adapter)

55

mV (AC-Adapter)

Voltage Regulation (Constant Voltage Mode)

Regulated Charge Voltage

V_REG

4.179

4.328

4.378

4.477

-0.5

4.20

4.35

4.40

4.50

—

4.221

4.372

4.422

4.523

+0.5

V

%

V_DD=[V_REG(typical)+1V]

I_OUT=30 mA

T_A=-5°C to +55°C

Regulated Charge Voltage Tolerance

Line Regulation

V_RTOL

T_A=-5°C to +55°C

|(ΔV_BAT

_BAT)/ΔV_DD

/

—

0.075

0.2

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

_OUT=30 mA

I_OUT=10 mA to 100 mA

_DD=[V_REG(typical)+1V]

V

|

I

Load Regulation

|ΔV_BAT/V_BAT

|

—

0.150

0.3

%

V

Supply Ripple Attenuation

PSRR

—

60

52

23

—

dB

I_OUT=10 mA, 10Hz to 1 kHz

I_OUT=10 mA, 10Hz to 10 kHz

I_OUT=10 mA, 10Hz to 1 MHz

Current Regulation (Fast Charge Constant-Current Mode)

AC-Adapter Fast Charge Current

I_REG

95

105

115

mA PROG1 = 10 kΩ

900

1000

1100

mA PROG1 = 1 kΩ, Note 2

T_A=-5°C to +55°C

Note 1: The supply voltage (V_DD) = V_ACwhen input power source is from Ac-Adapter and the supply voltage (V_DD) = V_USB

when input power source is from USB-Port.

2: The value is guaranteed by design and not production tested.

3: The current is based on the ratio of selected current regulation (I_REG).

4: The maximum charge impedance has to be less than shutdown impedance for normal operation.

DS22071A-page 4

MCP73837/8

DC CHARACTERISTICS (Continued)

Electrical Specifications: Unless otherwise indicated, all limits apply for V_DD= [V_REG(typical) + 0.3V] to 6V,

T_A= -40°C to +85°C. Typical values are at +25°C, V_DD= [V_REG(typical) + 1.0V]

Parameters

Sym

Min

Typ

Max

Units

Conditions

USB-Port Fast Charge Current

I_REG

80

90

100

500

mA PROG2 = Low

400

450

mA PROG2 = High

T_A=-5°C to +55°C

Maximum Output Current Limit

I_MAX

—

1200

—

mA PROG1 < 833Ω

Precondition Current Regulation (Trickle Charge Constant-Current Mode)

Precondition Current Ratio

I_PREG/ I_REG

7.5

15

30

10

20

12.5

25

%

Note 3

T_A=-5°C to +55°C

40

50

100

66.5

71.5

120

Precondition Current Threshold Ratio

V_PTH/ V_REG

64

69

—

69

74

—

V_BATLow to High

Precondition Hysteresis

V_PHYS

mV V_BATHigh to Low

Charge Termination

Charge Termination Current Ratio

I_TERM/ I_REG

3.75

5.6

7.5

15

5

6.25

9.4

%

PROG1 = 1 kΩ to 10 kΩ

7.5

10

20

T_A=-5°C to +55°C

12.5

25

Note 3

Automatic Recharge

Recharge Voltage Threshold Ratio

V_RTH/ V_REG

92

95

94.0

97

96

99

%

V_BATHigh to Low

T_A=-5°C to +55°C

Pass Transistor ON-Resistance

ON-Resistance

R_DSON

—

350

—

mΩ V_DD= 4.5V, T_J= 105°C

Battery Discharge Current

Output Reverse Leakage Current

I_DISCHARGE

—

0.1

0.55

-6

2

µA

Standby (PROG1 or PROG2

Floating)

Shutdown (V_DD< V_BAT

-

100 mV or V_DD< V_STOP

)

-15

Charge Complete

Status Indicators - STAT1, STAT2, PG (MCP73837)

Sink Current

I_SINK

V_OL

I_LK

—

16

0.3

35

1

mA

V

Low Output Voltage

Input Leakage Current

PROG1 Input (PROG1)

Charge Impedance Range

Shutdown Impedance

I_SINK= 4 mA

0.03

1

µA

High Impedance, V_DDon pin

R_PROG

1

—

kΩ

Note 4

70

200

Minimum Impedance for

Shutdown

PROG2 Inputs (PROG2)

Input High Voltage Level

Input Low Voltage Level

Shutdown Voltage Level

Input Leakage Current

V_IH

V_IL

0.8V_DD

—

7

—

%

0.2V_DD

0.8V_DD

15

V_SD

I_LK

0.2V_DD

—

%

µA

V_PROG2= V_DD

Note 1: The supply voltage (V_DD) = V_ACwhen input power source is from Ac-Adapter and the supply voltage (V_DD) = V_USB

when input power source is from USB-Port.

2: The value is guaranteed by design and not production tested.

3: The current is based on the ratio of selected current regulation (I_REG).

4: The maximum charge impedance has to be less than shutdown impedance for normal operation.

DS22071A-page 5

MCP73837/8

DC CHARACTERISTICS (Continued)

Electrical Specifications: Unless otherwise indicated, all limits apply for V_DD= [V_REG(typical) + 0.3V] to 6V,

T_A= -40°C to +85°C. Typical values are at +25°C, V_DD= [V_REG(typical) + 1.0V]

Parameters

Timer Enable (TE)

Sym

Min

Typ

Max

Units

Conditions

Input High Voltage Level

Input Low Voltage Level

Input Leakage Current

Thermistor Bias

V_IH

V_IL

I_LK

2

—

0.8

1

V

—

0.01

µA

V_TE= 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_T1

V_T1HYS

V_T2

1.20

—

1.23

-40

1.26

—

V

mV

V

Upper Trip Point Hysteresis

Lower Trip Threshold

0.235

—

0.250

40

0.265

—

V_T2High to Low

Lower Trip Point Hysteresis

System Test (LDO) Mode

Input High Voltage Level

THERM Input Sink Current

V_T2HYS

mV

V_IH

—

3

—

V_DD- 0.1

20

V

I_SINK

5.5

µA

Stand-by Or System Test

Mode

Bypass Capacitance

C_BAT

1

4.7

—

µF

I_OUT< 250 mA

I_OUT> 250 mA

Automatic Power Down (SLEEP Comparator, Direction Control)

Automatic Power Down Entry

Threshold

V_PD

V_BAT

10 mV

+

V_BAT

100 mV

+

V

2.3V < V_BAT< V_REG

V_DDFalling

Automatic Power Down Exit Threshold

V_PDEXIT

-

V_BAT

150 mV 250 mV

+

V_BAT

+

2.3V < V_BAT< V_REG

V_DDRising

Thermal Shutdown

Die Temperature

T_SD

—

150

10

—

°C

Die Temperature Hysteresis

T_SDHYS

Note 1: The supply voltage (V_DD) = V_ACwhen input power source is from Ac-Adapter and the supply voltage (V_DD) = V_USB

when input power source is from USB-Port.

2: The value is guaranteed by design and not production tested.

3: The current is based on the ratio of selected current regulation (I_REG).

4: The maximum charge impedance has to be less than shutdown impedance for normal operation.

DS22071A-page 6

MCP73837/8

AC CHARACTERISTICS

Electrical Specifications: Unless otherwise indicated, all limits apply for V_DD= [V_REG(typical) + 0.3V] 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 Timer Disabled

3.6

5.4

7.2

4.0

6.0

8.0

4.4

6.6

8.8

Hours

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

TEMPERATURE SPECIFICATIONS

Electrical Specifications: Unless otherwise indicated, all limits apply for V_DD= [V_REG(typ.) + 0.3V] to 6V.

Typical values are at +25°C, V_DD= [V_REG(typ.) + 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, 10-Lead MSOP

θ_JA

—

113

41

—

°C/W

4-Layer JC51-7 Standard Board,

Natural Convection. Note 1

Thermal Resistance, 10-Lead 3 mm x

3 mm DFN

4-Layer JC51-7 Standard Board,

Natural Convection

Note 1: This represents the minimum copper condition on the PCB ( Printed Circuit Board).

DS22071A-page 7

MCP73837/8

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_DD= [V_REG(typical) + 1V], I_OUT= 30 mA, and T_A= +25°C, Constant-voltage mode.

4.210

2.0

TEMP = 25°C

I_OUT= 50 mA

4.205

4.200

4.195

4.190

4.185

4.180

4.175

4.170

4.165

4.160

V_DD= Floating

V_BAT= 4.2V

I_OUT= 10 mA

1.6

1.2

0.8

0.4

0.0

I_OUT= 100 mA

I_OUT= 500 mA

I_OUT= 1000 mA

-40 -30 -20 -10

0

10 20 30 40 50 60 70 80

Temperature (°C)

4.5

4.8

5.0

5.3

5.5

5.8

6.0

Supply Voltage (V)

FIGURE 2-1:

Battery Regulation Voltage

FIGURE 2-4:

Output Leakage Current

(V ) vs. Supply Voltage (V ).

(I

) vs. Ambient Temperature (T ).

BAT

DD

DISCHARGE

A

2.0

4.210

4.205

V_DD= 5.2V

V_DD= Floating

TEMP = +25°C

1.8

1.6

1.4

1.2

1.0

0.8

0.6

0.4

0.2

0.0

I_OUT= 10 mA

I_OUT= 50 mA

4.200

4.195

4.190

4.185

4.180

4.175

4.170

I_OUT= 100 mA

I_OUT= 500 mA

I_OUT= 1000 mA

3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 4.0 4.1 4.2

Battery Voltage (V)

-40 -30 -20 -10

0 10 20 30 40 50 60 70 80

Ambient Temperature (°C)

FIGURE 2-2:

(V

Battery Regulation Voltage

FIGURE 2-5:

Output Leakage Current

) vs. Ambient Temperature (T ).

(I

) vs. Battery Voltage (V ).

BAT

A

DISCHARGE

BAT

0.50

1000

900

800

700

600

500

400

300

200

100

0

V_DD= V_BAT

TEMP = 25 °C

V_DD= 5.2V

Temp = 25°C

0.45

0.40

0.35

0.30

0.25

0.20

0.15

0.10

0.05

0.00

3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 4.0 4.1 4.2

Battery Voltage (V)

1

6

11 16 21 26 31 36 41 46 51 56 61

_PROG(kΩ)

R

FIGURE 2-3:

Output Leakage Current

FIGURE 2-6:

Charge Current (I

) vs.

OUT

(I ) vs. Battery Regulation Voltage

Programming Resistor (R

).

DISCHARGE

PROG

(V

).

BAT

DS22071A-page 8

MCP73837/8

Note: Unless otherwise indicated, V_DD= [V_REG(typical) + 1V], I_OUT= 30 mA and T_A= +25°C, Constant-voltage mode.

110

108

106

104

102

100

98

1200

1150

1100

1050

1000

950

R_PROG= 10 kΩ

V_DD= 5.2V

R_PROG= 1 kΩ

Temp = +25°C

900

96

850

94

800

92

750

90

700

-40 -30 -20 -10

0

10 20 30 40 50 60 70 80

4.5

4.8

5.0

5.3

5.5

5.8

6.0

Ambient Temperature (°C)

Supply Voltage (V)

FIGURE 2-7:

Charge Current (I

) vs.

FIGURE 2-10:

Charge Current (I

) vs.

OUT

Supply Voltage (V ).

Ambient Temperature (T ).

DD

A

55

54

53

52

51

50

49

48

47

46

45

104

102

100

98

R_PROG= 20 kΩ

V_DD= 5.2V

R_PROG= 10 kΩ

Temp = +25°C

96

94

92

90

-40 -30 -20 -10

0

10 20 30 40 50 60 70 80

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

1100

1050

1000

950

1200

1100

1000

900

800

700

600

500

400

300

200

100

0

R_PROG= 1 kΩ

_DD= 5.2V

R_PROG= 1 kΩ

V

900

850

800

750

700

-40 -30 -20 -10

0 10 20 30 40 50 60 70 80

Ambient Temperature (°C)

Junction Temperature (°C)

FIGURE 2-9:

Charge Current (I

) vs.

FIGURE 2-12:

Charge Current (I

) vs.

OUT

Ambient Temperature (T ).

Junction Temperature (T ).

A

J

DS22071A-page 9

MCP73837/8

Note: Unless otherwise indicated, V_DD= [V_REG(typical) + 1V], I_OUT= 30 mA and T_A= +25°C, Constant-voltage mode.

600

52.0

51.5

51.0

50.5

50.0

49.5

49.0

48.5

48.0

47.5

47.0

R_PROG= 2 kΩ

550

500

450

400

350

300

250

200

150

100

50

V_DD= 5.2V

0

Junction Temperature (°C)

Ambient Temperature (°C)

FIGURE 2-13:

Charge Current (I

) vs.

FIGURE 2-16:

Thermistor Current (I

)

THERM

OUT

Junction Temperature (T ).

vs. Ambient Temperature (T ).

J

A

120

110

100

90

80

70

60

50

40

30

20

10

0

R_PROG= 10 kΩ

I_OUT= 10 mA

C_OUT= 4.7 µF

-10

-20

-30

-40

-50

-60

-70

0.01

0.1

1

10

100

1000

Frequency (kHz)

Junction Temperature (°C)

FIGURE 2-14:

Charge Current (I

) vs.

FIGURE 2-17:

Power Supply Ripple

OUT

Junction Temperature (T ).

Rejection (PSRR).

J

0

52.0

51.5

51.0

50.5

50.0

49.5

49.0

48.5

48.0

47.5

47.0

Temp = +25°C

I_OUT= 100 mA

C_OUT= 4.7 µF

-10

-20

-30

-40

-50

-60

-70

0.01

0.1

1

10

100

1000

4.5

4.8

5.0

5.3

5.5

5.8

6.0

Frequency (kHz)

Supply Voltage (V)

FIGURE 2-15:

Thermistor Current (I

)

FIGURE 2-18:

Power Supply Ripple

THERM

vs. Supply Voltage (V ).

Rejection (PSRR).

DD

DS22071A-page 10

MCP73837/8

Note: Unless otherwise indicated, V_DD= [V_REG(typical) + 1V], I_OUT= 30 mA and T_A= +25°C, Constant-voltage mode.

1

0.9

0.8

0.7

0.6

0.5

0.4

0.3

0.2

0.1

0

0.1

0.05

0

-0.05

-0.1

-0.15

-0.2

-0.25

-0.3

16

14

12

10

8

0.1

0

I_OUT= 100 mA

-0.1

-0.2

-0.3

-0.4

-0.5

6

4

-0.1

2

I_OUT= 100 mA

0

Time (Minutes)

Time (µs)

FIGURE 2-19:

Line Transient Response.

FIGURE 2-22:

Load Transient Response.

16

14

12

10

8

0.1

0

-0.1

-0.2

-0.3

-0.4

-0.5

6

4

2

I_OUT= 10 mA

0

Time (µs)

FIGURE 2-20:

Line Transient Response.

FIGURE 2-23:

(I = 1A).

V

UVLO Start Delay

AC

OUT

0.35

0.3

0.04

I_OUT= 10 mA

0.02

0.25

0.2

0.15

0.1

0.05

0

-0.02

-0.04

-0.06

-0.08

-0.1

-0.05

-0.12

Time (Minutes)

FIGURE 2-21:

Load Transient Response.

FIGURE 2-24:

V

UVLO Start Delay

USB

(USB = Low).

DS22071A-page 11

MCP73837/8

Note: Unless otherwise indicated, V_DD= [V_REG(typical) + 1V], I_OUT= 30 mA and T_A= +25°C, Constant-voltage mode.

UVLOVAC

5.0

4.0

3.0

2.0

1.0

0.0

0.12

0.1

0.08

0.06

0.04

0.02

0

V_DD= 5.2V

_PROG= USB_Low

180 mAh Li-Ion Battery

R

0

20 40 60 80 100 120 140 160 180

Time (Minutes)

FIGURE 2-28:

Complete Charge Cycle

FIGURE 2-25:

V

UVLO Start Delay

USB

(180 mAh Li-Ion Battery).

(USB = High)

5.0

4.0

3.0

2.0

1.2

1

5.0

0.12

0.1

C.C. Begins

4.0

3.0

2.0

0.8

0.6

0.4

0.2

0

0.08

0.06

0.04

0.02

0

C.V. Begins

V_DD= 5.2V

_PROG= USB_Low

180 mAh Li-Ion Battery

V_DD= 5.2V

1.0

R

1.0

0.0

R

_PROG= 1 kΩ

1200 mAh Li-Ion Battery

Preconditioning

0.0

0

1

2

3

4

5

6

7

8

9

10

Time (Minutes)

FIGURE 2-29:

Typical Charge Profile in

FIGURE 2-26:

Complete Charge Cycle

Preconditioning and CC-CV (180 mAh Li-Ion

Battery).

(1200 mAh Li-Ion Battery).

4.5

4.0

3.5

3.0

2.5

2.0

1.2

0.9

0.6

0.3

0

1.5

V_DD= 5.2V

R_PROG= 1 kΩ

1200 mAh Li-Ion Battery

1.0

0.5

0.0

0

1

2

3

4

5

6

7

8

9

10

Time (Minutes)

FIGURE 2-27:

Typical Charge Profile in

Thermal Regulation (1200 mAh Li-Ion Battery).

DS22071A-page 12

MCP73837/8

3.0

PIN DESCRIPTION

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

TABLE 3-1: PIN FUNCTION TABLES

Pin Number

Symbol

I/O

Function

MSOP-10

DFN-10

1

2

3

4

5

6

1

2

3

4

5

6

V_AC

V_USB

I

AC-Adapter Supply Input

USB-Port Supply Input

STAT1

STAT2

V_SS

O

—

I/O

Charge Status Output 1 (Open-Drain)

Charge Status Output 2 (Open-Drain)

Battery Management 0V Reference

PROG1

Current Regulation Setting With AC-Adapter; Device Charge

Control Enable; Precondition Set Point for AC control

7

PROG2

I

Current Regulation Setting With USB-Port; Precondition Set Point

for USB control.

8

PG

TE

O

I

Available on MCP73837: Power-Good Status Output (Open-Drain)

Available on MCP73838: Timer Enable; Enables Safety Timer

(Active Low)

9

THERM

I/O

Thermistor Monitoring Input and Bias current; System Test (LDO)

Mode Input

10

—

10

V_BAT

V_SS

I/O

—

Battery Positive Input and Output Connection

EP

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).

3.1

AC-Adapter Supply Input (V_AC

)

3.5

Battery Management 0V Reference

(V_SS

)

A supply voltage of V_REG+ 0.3V to 6V from ac-dc wall-

adapter is recommended. When both the AC-Adapter

and the USB-Port supply voltages are present at same

time, the AC-Adapter dominates the regulated charge

current with the maximum value of 1A. Bypass to V_SS

with a minimum of 4.7 µF is recommended.

Connect to negative terminal of battery and input

supply.

3.6

Battery Charge Control Output

(V_BAT

)

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

batteries. Bypass to V_SSwith a minimum of 1 µF to

ensure loop stability when the battery is disconnected.

3.2

USB-Port Supply Input (V_USB)

A supply voltage of V_REG+ 0.3V to 6V from USB-Port is

recommended. When no supply voltage from V_ACpin is

available, the Li-Ion battery is charged directly from

USB-Port. Bypass to V_SSwith a minimum of 1 µF is

recommended.

3.7

AC-Adapter Current Regulation

Set (PROG1)

The AC-Adapter constant charge current is set by

placing a resistor from PROG1 to V_SS. PROG1 is the

set point of precondition and termination when the AC-

Adapter is present.

3.3

Charge Status Output 1 (STAT1)

STAT1 is an open-drain logic output for connection to a

LED for charge status indication. Alternatively, a pull-up

resistor can be applied for interfacing to a host micro-

controller.

PROG1 also functions as device charge control

enable. The MCP73837/8 is shut down when an

impedance value greater than 70 kΩ is applied to

PROG1. When PROG1 is floating, the MCP73837/8

enters stand-by mode.

3.4

Charge Status Output 2 (STAT2)

STAT2 is an open-drain logic output for connection to a

LED for charge status indication. Alternatively, a pull-up

resistor can be applied for interfacing to a host

microcontroller.

DS22071A-page 13

MCP73837/8

3.8

USB-Port Current Regulation Set

(PROG2)

3.10 Timer Enable (TE)

Timer Enable (TE) is available only on MCP73838.

(TE) enables the built-in safety timer when pull low and

disables the built-in safety timer when pull high.

The MCP73837/8 USB-Port current regulation set

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

selects a 1 unit load charge current; a logic High selects

a 5 unit loads charge current.

Note:

The built-in safety timer is available for both

MCP73837 and MCP73838 in the following

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

PROG2 also functions as the set point of precondition

and termination when USB-Port is present. When

PROG2 is floating, the MCP73837/8 enters in stand-by

mode.

3.11 Battery Temperature Monitor

(THERM)

MCP73837/8 continuously monitors the 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 the most

common 10 kΩ negative-temperature coefficient

thermistors (NTC).

3.9

Power Good (PG)

Power Good (PG) is available only on MCP73837. PG

is an open-drain logic output for connection to a LED

for input power supply indication. Alternatively, a pull-

up resistor can be applied for interfacing to a host

microcontroller.

DS22071A-page 14

MCP73837/8

4.0

DEVICE OVERVIEW

The MCP73837/8 devices are simple, yet fully integrated linear charge management controllers. Figure 4-1 depicts the

operational flow algorithm.

SHUTDOWN MODE*

* Continuously Monitored

V

<

V_BAT

-100 mV

^DD< V_STOP

V_DD

STAT1 = Hi-Z

STAT2 = Hi-Z

PG = Hi-Z

SYSTEM TEST (LDO) MODE

> (V -100 mV)

STANDBY MODE *

V

> (V

+100 mV)

THERM

DD

BAT

REG

STAT1 = LOW

STAT2 = LOW

PG = LOW

PROG > 200k

Ω

STAT1 = Hi-Z

STAT2 = Hi-Z

PG = LOW

Timer Suspended

V

< V

PTH

BAT

PRECONDITIONING MODE

Charge Current = I

PREG

STAT1 = LOW

STAT2 = Hi-Z

PG = LOW

Timer Reset

V

> V

PTH

BAT

TIMER FAULT

TEMPERATURE FAULT

FAST CHARGE MODE

V

> V

BAT PTH

No Charge Current

Charge Current = I

REG

Timer Expired

STAT1 = Hi-Z

STAT2 = Hi-Z

PG = LOW

STAT1 = Hi-Z

STAT2 = Hi-Z

PG = LOW

STAT1 = LOW

STAT2 = Hi-Z

PG = LOW

V

< V

RTH

BAT

Timer Suspended

Timer Enabled

V

= V

REG

BAT

CONSTANT VOLTAGE MODE

Charge Voltage = V

REG

STAT1 = LOW

STAT2 = Hi-Z

PG = LOW

I

< I

TERM

BAT

Timer Expired

CHARGE COMPLETE MODE

No Charge Current

STAT1 = Hi-Z

STAT2 = LOW

PG = LOW

FIGURE 4-1:

Flow Chart.

DS22071A-page 15

MCP73837/8

In this mode, the MCP73837/8 supplies a percentage

of the charge current (established with the value of the

resistor connected to the PROG pin) to the battery. The

percentage or ratio of the current is factory set. Refer to

4.1

Undervoltage Lockout (UVLO)

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. The UVLO circuitry has a built-in

hysteresis of 75 mV for the USB-Port and 55 mV for the

AC-Adapter.

Section 1.0

“Electrical

Characteristics”

for

preconditioning current options.

When the voltage at the V_BATpin rises above the

preconditioning threshold, the MCP73837/8 enters the

constant current or fast charge mode.

In the event a battery is present when the input power

is applied, the input supply must rise 100 mV above the

battery voltage before MCP73837/8 becomes

operational.

4.5

Constant Current MODE - Fast

Charge

The UVLO circuit places the device in shutdown mode

if the input supply falls to within +100 mV of the battery

voltage.

During the constant current mode, the programmed

(AC-Adapter) or selected (USB-Port) charge current is

supplied to the battery or load.

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

supply is below the UVLO threshold or within +100 mV

of the voltage at the V_BATpin, the MCP73837/8 is

placed in a shutdown mode.

For AC-Adapter, the charge current is established

using a single resistor from PROG to V_SS. The

program resistor and the charge current are calculated

using the following equation:

During any UVLO condition, the battery reverse

discharge current shall be less than 2 µA.

EQUATION 4-1:

4.2

AUTONOMOUS POWER SOURCE

SELECTION

1000V

R_PROG

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

The MCP73837/8 devices are designed to select the

USB-port or the AC-Adapter as the power source

automatically. If the AC-Adapter input is not present,

the USB-Port is selected. If both inputs are available,

the AC-Adapter has first priority.

where R_PROGis in kilo-ohms (kΩ) and I_REGis in

milliampers (mA).

When charging from

a

USB-Port, the host

microcontroller has the option of selecting either a one

unit load or a five unit loads charge rate based on the

PROG2 input. A logic LOW selects a one unit load

charge rate, a HIGH selects a five unit loads charge

rate, and high impedance input suspends or disables

charging.

Note:

If the input power is switched during a

charge cycle, the power path switch-over

shall be a break-before-make connection.

As a result, the charge current can

momentarily go to zero. The charge cycle

timer shall remain continuous.

Note:

USB Specification Rev. 2.0 defines the

maximum absolute current for one unit

load is 100 mA. This value is not an aver-

age over time and shall not be exceed.

4.3

Charge Qualification

For a charge cycle to begin, all UVLO conditions must

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

Constant current mode is maintained until the voltage

at the V_BATpin reaches the regulation voltage, V_REG.,

when constant current mode is invoked, the internal

timer is reset.

A charge current programming resistor must be con-

nected from PROG1 to V_SS. If the PROG1 or PROG2

pin are open or floating, the MCP73837/8 is disabled

and the battery reverse discharge current is less than

2 µA. In this manner, the PROG1 pin acts as a charge

enable and can be used as a manual shutdown.

4.5.1

TIMER EXPIRED DURING

CONSTANT CURRENT - FAST

CHARGE MODE

4.4

Preconditioning

If the internal timer expires before the recharge voltage

threshold is reached, a timer fault is indicated and the

charge cycle terminates. The MCP73837/8 remains in

this condition until the battery is removed, the input

battery is removed or the PROG1/2 pin is opened. If the

battery is removed or the PROG1/2 pin is opened, the

MCP73837/8 enters the Stand-by mode where it

remains until a battery is reinserted or the PROG1/2 pin

If the voltage at the V_BATpin is less than the

preconditioning threshold, the MCP73837/8 enters a

preconditioning mode. The preconditioning threshold is

factory set. Refer to Section 1.0 “Electrical

Characteristics” for preconditioning threshold

options.

DS22071A-page 16

MCP73837/8

is reconnected. If the input power is removed, the

MCP73837/8 is in Shutdown. When the input power is

reapplied, a normal start-up sequence ensues.

4.9

Thermal Regulation

The MCP73837/8 limits the charge current based on

the die temperature. The thermal regulation optimizes

the charge cycle time while maintaining device

reliability. Figure 4-2 depicts the thermal regulation for

the MCP73837/8. Refer to Section 1.0 “Electrical

Characteristics” for thermal package resistances and

Section 6.1.1.2 “Thermal Considerations” for

calculating power dissipation.

4.6

Constant Voltage Mode

When the voltage at the V_BATpin reaches the

regulation voltage, V_REG, constant voltage regulation

begins. The regulation voltage is factory set to 4.20V,

4.35V, 4.40V, or 4.5V with a tolerance of ± 0.5%.

.

4.7

Charge Termination

1200

1100

1000

900

800

700

600

500

400

300

200

100

0

R_PROG= 1 kΩ

The charge cycle is terminated when, during constant

voltage mode, the average charge current diminishes

below a percentage of the programmed charge current

(established with the value of the resistor connected to

the PROG pin) or the 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 percentage or ratio of the

current is factory set. The timer period is factory set and

can be disabled. Refer to Section 1.0 “Electrical

Characteristics” for charge termination current ratio

and timer period options.

25 35 45 55 65 75 85 95 105 115 125 135 145 155

Junction Temperature (°C)

FIGURE 4-2:

Thermal Regulation.

The charge current is latched off and the MCP73837/8

enters a charge complete mode.

4.10 Thermal Shutdown

The MCP73837/8 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 MCP73837/8 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.

Note:

Charge termination and automatic

recharge features avoid constant charging

Li-Ion batteries to prolong the life of Li-Ion

batteries while keeping their capacity at

healthy level.

DS22071A-page 17

MCP73837/8

at the THERM pin to factory set thresholds of 1.20V

and 0.25V, typically. Once a voltage outside the

thresholds is detected during a charge cycle, the

MCP73837/8 immediately suspends the charge cycle.

5.0

DETAILED DESCRIPTION

5.1

Analog Circuitry

The MCP73837/8 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

BATTERY MANAGEMENT INPUT

SUPPLY (V

)

DD

The V_DDinput is the input supply to the MCP73837/8.

The MCP73837/8 can be supplied by either AC-

Adapter (V_AC) or USB-Port (V_USB) with autonomous

source selection. The MCP73837/8 automatically

enters a Power-down mode if the voltage on the V_DD

input falls to within +100 mV of the battery voltage or

below the UVLO voltage (V_STOP). This feature prevents

draining the battery pack when both the V_ACand V_USB

supplies are not present.

If temperature monitoring is not required, place a

standard 10 kΩ resistor from THERM to V_SS

.

5.1.5 SYSTEM TEST (LDO) MODE

The MCP73837/8 can be placed in a system test mode.

In this mode, the MCP73837/8 operates as a low drop-

out linear regulator (LDO). The output voltage is

regulated to the factory set voltage regulation option.

The available output current is limited to the pro-

grammed fast charge current. For stability, the V_BAT

output must be bypassed to V_SSwith a minimum

capacitance of 1 µF for output currents up to 250 mA.

A minimum capacitance of 4.7 µF is required for output

currents above 250 mA.

5.1.2

AC-ADAPTER CURRENT

REGULATION SET (PROG1)

For the MCP73837/8, the charge current regulation

can be scaled by placing a programming resistor

(R_PROG) from the PROG input to V_SS. The program

resistor and the charge current are calculated using

the following equation:

The system test mode is entered by driving the THERM

input greater than (V_DD- 100 mV) with no battery

connected to the output. In this mode, the MCP73837/

8 can be used to power the system without a battery

being present.

EQUATION 5-1:

1000V

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

R_PROG

Where:

Note 1: I_THERMis disabled during shutdown,

stand-by, and system test modes.

R_PROG

I_REG

=

kilo-ohms (kΩ)

milli-ampere (mA)

2: A pull-down current source on the

THERM input is active only in stand-by

and system test modes.

The preconditioning current and the charge

termination current are ratiometric to the fast charge

current based on the selected device options.

3: During system test mode, the PROG

input sets the available output current

limit.

5.1.3

BATTERY CHARGE CONTROL

OUTPUT (V

4: System test mode shall be exited by

releasing the THERM input or cycling

input power.

)

BAT

The battery charge control output is the drain terminal

of an internal P-channel MOSFET. The MCP73837/8

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

Digital Circuitry

5.2.1

STATUS INDICATORS AND POWER

GOOD (PG) OPTION

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.

5.1.4

TEMPERATURE QUALIFICATION

(THERM)

The MCP73837/8 continuously monitors battery

temperature during a charge cycle by measuring the

voltage between the THERM and the V_SSpins. An

internal 50 µA current source provides the bias for the

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 MCP73837/8 compares the voltage

DS22071A-page 18

MCP73837/8

5.2.2

USB-PORT CURRENT

5.2.4

TIMER ENABLE (TE) OPTION

REGULATION SELECT (PROG2)

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. The TE option is

available only on MCP73838.

For the MCP73837/8, driving the PROG2 input to a

logic Low selects the low charge current setting

(maximum 100 mA). Driving the PROG2 input to a logic

High selects the high charge current setting (maximum

500 mA).

TABLE 5-1:

STATUS OUTPUTS

CHARGE CYCLE STATE

Shutdown

STAT1 STAT2

PG

Hi-Z

L

5.2.5

DEVICE DISABLE (PROG1/2)

Hi-Z

L

Hi-Z

L

The current regulation set input pin (PROG1/2) can be

used to terminate a charge at any time during the

charge cycle, as well as to initiate a charge cycle or to

initiate a recharge cycle. Placing a programming

resistor from the PROG1/2 input to V_SSenables the

device. Allowing the PROG1/2 input to float or applying

a logic-high input signal, disables the device and

terminates a charge cycle. When disabled, the device’s

supply current is reduced to 75 µA, typically.

Standby

Preconditioning

L

Constant Current

Constant Voltage

Charge Complete - Standby

Temperature Fault

Timer Fault

L

Hi-Z

L

Hi-Z

L

System Test Mode

L

5.2.3

POWER GOOD (PG) OPTION

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 be pulled up only

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

to the MCP73837 is above the UVLO threshold and

greater than the battery voltage. If the supply voltage is

above the UVLO, but below V_REG(typical)+0.3V, the

MCP73837 will pulse the PG output as the device

determines if a battery is present. The PG option is

available only on MCP73837.

DS22071A-page 19

MCP73837/8

Lithium-Polymer cells Constant-current followed by

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

alone MCP73837 application circuit, while Figure 6-2

and Figure 6-3 depict the accompanying charge

profile.

6.0

APPLICATIONS

The MCP73837/8 devices are designed to operate in

conjunction with a host microcontroller or in stand-

alone applications. The MCP73837/8 devices provide

the preferred charge algorithm for Lithium-Ion and

1

2

3

10

V

BAT

AC

Thermsitor

9

C

OUT

Single

Li-Ion

Cell

USB Port

THERM

USB

C

IN1

1

ΚΩ

REGULATED

WALL CUBE

C

IN2

5

V

STAT1

SS

1

ΚΩ

4

8

7

6

STAT2

/PG

PROG2

PROG1

Hi

Low

R

PROG

MCP73837

MCP73837 Typical Stand-Alone Application Circuit.

FIGURE 6-1:

6.1

Application Circuit Design

5.0

4.0

3.0

2.0

1.2

1

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.

0.8

0.6

0.4

0.2

0

V_DD= 5.2V

_PROG= 1 kΩ

1200 mAh Li-Ion Battery

1.0

0.0

R

Time (Minutes)

6.1.1

COMPONENT SELECTION

FIGURE 6-2:

Typical Charge Profile

(1200 mAh Li-Ion Battery).

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.

4.5

4.0

3.5

3.0

2.5

2.0

1.5

1.2

0.9

0.6

0.3

0

6.1.1.1

Charge Current

The preferred fast charge current for Lithium-Ion cells

should always follow references and guidance from

battery manufacturers. For example, programming

700 mA fast charge current for a 1000 mAh Li-Ion

battery pack if its preferred fast charge rate is 0.7C.

This will result the shortest charge cycle time without

degradation a battery's life and performance.

V_DD= 5.2V

1.0

R

_PROG= 1 kΩ

0.5

0.0

1200 mAh Li-Ion Battery

0

1

2

3

4

5

6

7

8

9

10

Time (Minutes)

6.1.1.2

Thermal Considerations

FIGURE 6-3:

Thermal Regulation (1200 mAh Li-Ion Battery).

Typical Charge Profile in

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:

DS22071A-page 20

MCP73837/8

Placing a programming resistor from the PROG1 input

to V_SSor driving PROG2 to logic High or Low enables

the device. Allowing either the PROG1 or PROG2 input

float disables the device and terminates a charge cycle.

When disabled, the device’s supply current is reduced

to 75 µA, typically.

EQUATION 6-1:

PowerDissipation = (V

– V

) × I

PTHMIN REGMAX

DDMAX

Where:

V_DDMAX

I_REGMAX

V_PTHMIN

=

the maximum input voltage

the maximum fast charge current

6.1.1.6

Temperature Monitoring

the minimum transition threshold

voltage

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.

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

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

is:

For NTC thermistors:

EXAMPLE 6-1:

EQUATION 6-2:

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

R_T2× R_COLD

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

R

_T2+ R_COLD

This power dissipation with the battery charger in the

MSOP-10 package will cause thermal regulation to be

entered as depicted in Figure 6-3. Alternatively, the

3 mm x 3 mm DFN package could be utilized to reduce

the charge cycle times.

R_T2× R_HOT

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

_T2+ R_HOT

R

Where:

R_T1

=

the fixed series resistance

the fixed parallel resistance

6.1.1.3

External Capacitors

R_T2

R_COLD

the thermistor resistance at the

lower temperature of interest

The MCP73837/8 is stable with or without a battery

load. In order to maintain good AC stability in the

Constant Voltage mode, a minimum capacitance of

R_HOT

=

the thermistor resistance at the

upper temperature of interest

1 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.

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.

6.1.1.7

Charge Status Interface

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 1 µF ceramic,

tantalum, or aluminum electrolytic capacitor at the

output is usually sufficient to ensure stability for output

currents up to 500 mA.

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

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

output during a charge cycle.

6.2

PCB Layout Issues

6.1.1.4

Reverse-Blocking Protection

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.

The MCP73837/8 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.

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.

6.1.1.5

Charge Inhibit

The current regulation set input pin (PROG1/2) can be

used to terminate a charge at any time during the

charge cycle, as well as to initiate a charge cycle or

initiate a recharge cycle.

DS22071A-page 21

MCP73837/8

7.0

7.1

PACKAGING INFORMATION

Package Marking Information

10-Lead DFN

Example:

Marking

Code

Marking

Code

Part Number *

1

2

3

4

5

10

9

1

10

9

XXXX

XYWW

NNN

BABA

0748

256

2

3

4

5

MCP73837-FCI/MF

MCP73837-FJI/MF

MCP73837-NVI/MF

MCP73838-FCI/MF

MCP73838-FJI/MF

MCP73838-NVI/MF

BABA

BABB

BABC

BACA

BACB

BACC

MCP73837T-FCI/MF

MCP73837T-FJI/MF

MCP73837T-NVI/MF

MCP73838T-FCI/MF

MCP73838T-FJI/MF

MCP73838T-NVI/MF

BABA

BABB

BABC

BACA

BACB

BACC

8

7

6

* Consult Factory for Alternative Device Options.

Example:

10-Lead MSOP * *

Marking

Code

Marking

Code

Part Number *

MCP73837-FCI/UN

MCP73837-FJI/UN

MCP73837-NVI/UN

MCP73838-FCI/UN

MCP73838-FJI/UN

MCP73838-NVI/UN

837FCI MCP73837T-FCI/UN

837FCI

837FJI

837NVI

838FCI

838FJI

838NVI

837FCI

748256

XXXXXX

YWWNNN

837FJI

MCP73837T-FJI/UN

837NVI MCP73837T-NVI/UN

838FCI MCP73838T-FCI/UN

838FJI

MCP73838T-FJII/UN

838NVI MCP73838T-NVI/UN

* Consult Factory for Alternative Device Options.

* * Consult Factory for MSOP Package Availability.

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.

DS22071A-page 22

MCP73837/8

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DS22071A-page 23

MCP73837/8

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DS22071A-page 24

MCP73837/8

APPENDIX A: REVISION HISTORY

Revision A (November 2007)

• Original Release of this Document.

DS22071A-page 25

MCP73837/8

NOTES:

DS22071A-page 26

MCP73837/8

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)

MCP73837-FCI/UN: 10-lead MSOP pkg.

Output Temp. Package

Options*

MCP73837-FJI/UN: 10-lead MSOP pkg.

MCP73837-NVI/UN: 10-lead MSOP pkg.

MCP73837-FCI/MF: 10-lead DFN pkg.

MCP73837-FJI/MF: 10-lead DFN pkg.

MCP73837-NVI/MF: 10-lead DFN pkg.

Device:

MCP73837: 1A Fully Integrated Charger,

PG function on pin 8

MCP73837T: 1A Fully Integrated Charger,

PG function on pin 8

a)

b)

c)

d)

e)

f)

MCP73838-FCI/UN: 10-lead MSOP pkg.

MCP73838-FJI/UN: 10-lead MSOP pkg.

MCP73838-NVI/UN: 10-lead MSOP pkg.

MCP73838-FCI/MF: 10-lead DFN pkg.

MCP73838-FJI/MF: 10-lead DFN pkg.

MCP73838-NVI/MF: 10-lead DFN pkg.

(Tape and Reel)

MCP73838: 1A Fully Integrated Charger,

TE function on pin 8

MCP73838T: 1A Fully Integrated Charger,

TE function on pin 8

(Tape and Reel)

* * Consult Factory for Alternative Device Options

Output Options * *

* Refer to table below for different operational options.

* * Consult Factory for Alternative Device Options.

Temperature:

I

=

-40°C to +85°C

Package Type:

MF

UN

=

Plastic Dual Flat No Lead (DFN)

(3x3x0.9 mm Body), 10-lead

Plastic Micro Small Outline Package (MSOP***),

10-lead

* Operational Output Options

Output Options

V_REG

I_PREG/I_REG

V_PTH/V_REG

I_TERM/I_REG

V_RTH/V_REG

Timer Period

AM

BZ

FC

GP

G8

NV

YA

6S

B6

CN

4.20V

4.35V

4.40V

4.50V

4.20V

10%

100%

10%

100%

10%

71.5%

N/A

7.5%

5.0%

20%

96.5%

94%

0 hours

6 hours

8 hours

6 hours

4 hours

71.5%

N/A

71.5%

66.5%

71.5%

* * Consult Factory for Alternative Device Options.

* * * Consult Factory for MSOP Package Availability

DS22071A-page 27

MCP73837/8

NOTES:

DS22071A-page 28

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, microID, MPLAB, PIC,

PICmicro, PICSTART, PRO MATE, rfPIC and SmartShunt are

registered trademarks of Microchip Technology Incorporated

in the U.S.A. and other countries.

AmpLab, FilterLab, Linear Active Thermistor, Migratable

Memory, 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, FlexROM, fuzzyLAB,

In-Circuit Serial Programming, ICSP, ICEPIC, Mindi, MiWi,

MPASM, MPLAB Certified logo, MPLIB, MPLINK, PICkit,

PICDEM, PICDEM.net, PICLAB, PICtail, PowerCal,

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

Mode, Smart Serial, SmartTel, Total Endurance, UNI/O,

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.

DS22071A-page 29

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: 91-80-4182-8400

Fax: 91-80-4182-8422

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 - Fuzhou

Tel: 86-591-8750-3506

Fax: 86-591-8750-3521

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 - Hong Kong SAR

Tel: 852-2401-1200

Fax: 852-2401-3431

Malaysia - Kuala Lumpur

Tel: 60-3-6201-9857

Fax: 60-3-6201-9859

Dallas

Addison, TX

Tel: 972-818-7423

Fax: 972-818-2924

UK - Wokingham

Tel: 44-118-921-5869

Fax: 44-118-921-5820

China - Nanjing

Tel: 86-25-8473-2460

Fax: 86-25-8473-2470

Malaysia - Penang

Tel: 60-4-227-8870

Fax: 60-4-227-4068

Detroit

Farmington Hills, MI

Tel: 248-538-2250

Fax: 248-538-2260

China - Qingdao

Tel: 86-532-8502-7355

Fax: 86-532-8502-7205

Philippines - Manila

Tel: 63-2-634-9065

Fax: 63-2-634-9069

Kokomo

Kokomo, IN

Tel: 765-864-8360

Fax: 765-864-8387

China - Shanghai

Tel: 86-21-5407-5533

Fax: 86-21-5407-5066

Singapore

Tel: 65-6334-8870

Fax: 65-6334-8850

China - Shenyang

Tel: 86-24-2334-2829

Fax: 86-24-2334-2393

Taiwan - Hsin Chu

Tel: 886-3-572-9526

Fax: 886-3-572-6459

Los Angeles

Mission Viejo, CA

Tel: 949-462-9523

Fax: 949-462-9608

China - Shenzhen

Tel: 86-755-8203-2660

Fax: 86-755-8203-1760

Taiwan - Kaohsiung

Tel: 886-7-536-4818

Fax: 886-7-536-4803

Santa Clara

Santa Clara, CA

Tel: 408-961-6444

Fax: 408-961-6445

China - Shunde

Tel: 86-757-2839-5507

Fax: 86-757-2839-5571

Taiwan - Taipei

Tel: 886-2-2500-6610

Fax: 886-2-2508-0102

Toronto

Mississauga, Ontario,

Canada

Tel: 905-673-0699

Fax: 905-673-6509

China - Wuhan

Tel: 86-27-5980-5300

Fax: 86-27-5980-5118

Thailand - Bangkok

Tel: 66-2-694-1351

Fax: 66-2-694-1350

China - Xian

Tel: 86-29-8833-7252

Fax: 86-29-8833-7256

10/05/07

DS22071A-page 30


型号：	MCP738376SIUN
厂家：	MICROCHIP
描述：	Advanced Stand-Alone Li-Ion / Li-Polymer Battery Charge Management Controller with Autonomous AC-Adapter or USB-Port Source Selection 先进的独立锂离子/锂聚合物电池充电管理控制器，自主交流适配器或USB端口源选择电池控制器
文件：	总30页 (文件大小：816K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

MCP738376SIUN [MICROCHIP]

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