MCP73855T-MF_技术文档

MCP73853/55

USB Compatible Li-Ion/Li-Polymer

Charge Management Controllers

Features

Description

• Linear Charge Management Controllers

- Integrated Pass Transistor

The MCP7385X devices are highly advanced linear

charge management controllers for use in space-

limited, cost-sensitive applications. The MCP73853

combines high-accuracy constant-voltage, constant-

current regulation, cell preconditioning, cell temperature

monitoring, advanced safety timers, automatic charge

termination, internal current sensing, reverse blocking

protection and charge status and fault indication in a

space-saving 16-lead, 4 x 4 QFN package.

- Integrated Current Sense

- Reverse Blocking Protection

• High-Accuracy Preset Voltage Regulation: + 0.5%

• Two Selectable Voltage Regulation Options:

- 4.1V, 4.2V

• Programmable Charge Current

• USB Compatible Charge Current Settings

• Programmable Safety Charge Timers

• Preconditioning of Deeply Depleted Cells

• Automatic End-of-Charge Control

The MCP73855 employs all the features of the

MCP73853, with the exception of the cell temperature

monitor and one status output. The MCP73855 is

offered in a space-saving 10-lead, 3 x 3 DFN package.

The MCP73853 and MCP73855 are designed

specifically for USB applications, adhering to all the

specifications governing the USB power bus.

• Optional Continuous Cell Temperature

Monitoring:

- MCP73853

The MCP7385X devices provide two selectable voltage

regulation options (4.1V or 4.2V) for use with either

coke or graphite anodes.

• Charge Status Output for Direct LED Drive

• Fault Output for Direct LED Drive

- MCP73853

The MCP7385X devices provide complete, fully-

functional, charge management solutions, operating

with an input voltage range of 4.5V to 5.5V.

• Automatic Power-Down

• Thermal Regulation

• Temperature Range: -40°C to +85°C

• Packaging:

The MCP7385X devices are fully specified over the

ambient temperature range of -40°C to +85°C.

- 16-Lead, 4x4 mm QFN (MCP73853)

- 10-Lead, 3x3 mm DFN (MCP73855)

Package Types

16-Pin QFN

Applications

16 15 14 13

• Lithium-Ion/Lithium-Polymer Battery Chargers

• Personal Data Assistants (PDAs)

• Cellular Telephones

V_SET

V_DD1

V_DD2

V_SS1

V_BAT3

V_BAT2

V_BAT1

V_SS3

1

2

3

4

12

11

10

9

MCP73853

• Hand-Held Instruments

• Cradle Chargers

5

6

7

8

• Digital Cameras

• MP3 Players

10-Pin DFN

• Bluetooth Headsets

• USB Chargers

1

10

EN

STAT1

V_SET

2

3

4

5

9

8

7

6

V_BAT2

V_BAT1

V_DD1

MCP73855

V_SS2

V_SS1

TIMER

PROG

 2004 Microchip Technology Inc.

DS21915A-page 1

MCP73853/55

Typical Application

400 mA Lithium-Ion Battery Charger

3

2

8

9

5V

4.7 µF

V

DD1

BAT1

4.7 µF

SET

BAT2

10

1

EN

STAT1

+

–

Single

Lithium-Ion

Cell

6

TIMER

0.1 µF

5

4, 7

PROG

V

SS

MCP73855

Functional Block Diagram

Direction

Control

V

BAT1

DD1

V

BAT2

DD2

DD

G = 0.001

4 kΩ

V

REF

Charge Current

Control Amplifier

90

3 kΩ

kΩ

PROG

Voltage Control

Amplifier

+

–

11 kΩ

–

Charge

Termination

Comparator

V

REF

10 kΩ

V

REF

V

BAT3

110 kΩ

10 kΩ

+

–

Precondition

Charge_OK

Precon

600 kΩ

149 kΩ

I

/12

Precondition

Control

+

REG

Comp.

–

U

VLO

COMPARATOR

+

–

Constant-voltage/

Recharge Comp.

V

UVLO

+

–

1.58 kΩ

300 kΩ

EN

Power-On

Delay

V

REF

V

UVLO

Bias and

Reference

Generator

(1.2V)

V

REF

SET

10.3 kΩ

V

SS1

SS2

SS3

THREF

THERM

Temperature

Comparators

100 kΩ

STAT1

+

Drv Stat 1

Drv Stat 2

-

Charge Control,

50 kΩ

Charge Timers,

and

I

/12

REG

STAT2

+

-

Status Logic

Oscillator

MCP73853 ONLY

Charge_OK

TIMER

DS21915A-page 2

 2004 Microchip Technology Inc.

MCP73853/55

*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

...............................................................................6.5V

DD1,2

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

SS

DD

Maximum Junction Temperature, T ............Internally Limited

J

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

ESD protection on all pins:

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

Machine Model (200pF, No Series Resistance) ..........400V

DC CHARACTERISTICS

Electrical Specifications: Unless otherwise indicated, all limits apply for V_DD= [V_REG(Typ) + 0.3V] to 5.5V,

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

Parameters

Supply Input

Sym

Min

Typ

Max Units

Conditions

Supply Voltage

Supply Current

V_DD

I_SS

4.5

—

5.5

4

V

0.28

0.83

4.45

4.40

µA Disabled

mA Operating

—

4

UVLO Start Threshold

UVLO Stop Threshold

V_START

V_STOP

4.25

4.20

4.65

4.55

V

V_DDLow-to-High

V_DDHigh-to-Low

Voltage Regulation (Constant-Voltage Mode)

Regulated Output Voltage

V_REG

4.079

4.179

4.1

4.2

4.121

4.221

V

V_SET= V_SS

V_SET= V_DD

V_DD= [V_REG(Typ) + 1V],

I

_OUT= 10 mA, T_A= -5°C to +55°C

%/V V_DD= [V_REG(Typ) + 1V] to 5.5V

_OUT= 10 mA

Line Regulation

|(∆V_BAT

_BAT)| /∆V_DD

/

—

0.020

0.022

0.25

V

I

Load Regulation

|∆V_BAT/V_BAT

|

%

I_OUT= 10 mA to 150 mA

V_DD= [V_REG(Typ) + 1V]

Supply Ripple Attenuation

PSRR

—

50

26

—

1

dB I_OUT= 10 mA, 10 Hz to 1 kHz

dB I_OUT= 10 mA, 10 Hz to 10 kHz

24

dB

µA

I

_OUT= 10 mA, 10 Hz to 1 MHz

0.24

Output Reverse-Leakage

Current

I

V_DD< V_BAT= V_REG(Typ)

DISCHARGE

Current Regulation (Fast Charge Constant-Current Mode)

Fast Charge Current

Regulation

I_REG

70

85

100

475

mA PROG = OPEN

mA PROG = V_SS

T_A= -5°C to +55°C

325

400

Preconditioning Current Regulation (Trickle Charge Constant-Current Mode)

Precondition Current

Regulation

I_PREG

5

9

15

75

mA PROG = OPEN

mA PROG = V_SS

T_A= -5°C to +55°C

25

40

Precondition Threshold

Voltage

V_PTH

2.70

2.75

2.80

2.85

2.90

2.95

V

V_SET= V_SS

V_SET= V_DD

V_BATLow-to-High

 2004 Microchip Technology Inc.

DS21915A-page 3

MCP73853/55

DC CHARACTERISTICS (Continued)

Electrical Specifications: Unless otherwise indicated, all limits apply for V_DD= [V_REG(Typ) + 0.3V] to 5.5V,

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

Parameters

Sym

Min

Typ

Max Units

Conditions

Charge Termination

Charge Termination Current

I_TERM

3.7

18

6.5

32

9.3

46

mA PROG = OPEN

mA PROG = V_SS

T_A= -5°C to +55°C

Automatic Recharge

Recharge Threshold Voltage

V_RTH

V_REG– V_REG– V_REG

–

V

V_BATHigh-to-Low

300mV 200mV 100mV

Thermistor Reference - MCP73853

Thermistor Reference

Output Voltage

V_THREF

2.475

200

—

2.55

—

2.625

—

V

T_A= 25°C, V_DD= V_REG(Typ) + 1V,

I_THREF= 0 mA

Thermistor Reference

Source Current

I_THREF

µA

Thermistor Reference Line

Regulation

|(∆V_THREF

/

0.05

0.02

0.25

0.10

%/V V_DD= [V_REG(Typ) + 1V] to 5.5V

V_THREF)|/∆V_DD

|∆V

/

%

Thermistor Reference Load

Regulation

I_THREF= 0 mA to 0.20 mA

THREF

V

THREF|

Thermistor Comparator - MCP73853

Upper Trip Threshold

Upper Trip Point Hysteresis

Lower Trip Threshold

Lower Trip Point Hysteresis

Input Bias Current

V_T1

V_T1HYS

V_T2

1.18

—

1.25

-50

0.62

80

1.32

—

V

mV

V

0.59

—

0.66

—

V_T2HYS

I_BIAS

mV

µA

—

2

Status Indicator – STAT1, STAT2

Sink Current

I_SINK

V_OL

I_LK

4

8

12

400

1

mA

Low Output Voltage

Input Leakage Current

Enable Input

—

200

0.01

mV I_SINK= 1 mA

µA I_SINK= 0 mA, V_STAT1,2= 5.5V

Input High Voltage Level

Input Low Voltage Level

Input Leakage Current

Thermal Shutdown

Die Temperature

V_IH

V_IL

I_LK

1.4

—

0.8

1

V

—

0.01

µA V_ENABLE= 5.5V

T_SD

—

155

10

—

°C

Die Temperature Hysteresis

T_SDHYS

DS21915A-page 4

 2004 Microchip Technology Inc.

MCP73853/55

AC CHARACTERISTICS

Electrical Specifications: Unless otherwise indicated, all limits apply for V_DD= [V_REG(Typ) + 0.3V] to 5.5V,

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

Parameters

Sym

Min

Typ

Max

Units

Conditions

V_DDLow-to-High

UVLO Start Delay

t_START

—

5

ms

Current Regulation

Transition Time Out of

Preconditioning

t_DELAY

t_RISE

—

1

ms

V_BAT< V_PTHto V_BAT> V_PTH

I_OUTRising to 90% of I_REG

Current Rise Time Out of

Preconditioning

Fast Charge Safety Timer

Period

t_FAST

1.1

1.5

1.9

Hours C_TIMER= 0.1 µF

Minutes C_TIMER= 0.1 µF

Hours C_TIMER= 0.1 µF

Preconditioning Current Regulation

Preconditioning Charge

Safety Timer Period

t_PRECON

45

60

3

75

Charge Termination

Elapsed Time Termination

Period

t_TERM

2.2

3.8

Status Indicators

Status Output turn-off

Status Output turn-on

t_OFF

t_ON

—

200

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 5.5.

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

Thermal Package Resistances

T_A

T_J

T_A

-40

-65

—

+85

+125

+150

°C

4-Layer JC51-7

Thermal Resistance, 16-L, 4mm x 4mm QFN

Thermal Resistance, 10-L, 3mm x 3mm DFN

θ_JA

—

37

51

—

°C/W Standard Board,

Natural Convection

4-Layer JC51-7

°C/W Standard Board,

Natural Convection

θ_JA

 2004 Microchip Technology Inc.

DS21915A-page 5

MCP73853/55

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(Typ) + 1V], I_OUT= 10 mA and T_A= +25°C.

4.250

4.230

4.210

4.190

4.170

4.150

1.00

0.90

0.80

0.70

0.60

0.50

0.40

0.30

0.20

V_SET= V_DD

V_DD= 5.2 V

V_SET= V_DD

V_DD= 5.2 V

0

50 100 150 200 250 300 350 400

0

50 100 150 200 250 300 350 400

I_OUT(mA)

FIGURE 2-1:

Battery Regulation Voltage

FIGURE 2-4:

Supply Current (I_SS) vs.

(V_BAT) vs. Charge Current (I_OUT).

Charge Current (I_OUT).

4.250

4.230

4.210

4.190

4.170

4.150

1.00

0.90

0.80

0.70

0.60

0.50

0.40

0.30

0.20

V_SET= V_DD

I_OUT= 375 mA

V_SET= V_DD

I_OUT= 375 mA

4.5

4.7

4.9

5.1

_DD(V)

5.3

5.5

4.5

4.7

4.9

5.1

5.3

5.5

V

V_DD(V)

FIGURE 2-2:

Battery Regulation Voltage

FIGURE 2-5:

Supply Current (I_SS) vs.

(V_BAT) vs. Supply Voltage (V_DD).

Supply Voltage (V_DD).

4.250

4.230

4.210

4.190

4.170

4.150

1.00

0.90

0.80

0.70

0.60

0.50

0.40

0.30

0.20

V_SET= V_DD

I_OUT= 10 mA

V_SET= V_DD

I_OUT= 10 mA

4.5

4.7

4.9

5.1

_DD(V)

5.3

5.5

4.5

4.7

4.9

5.1

5.3

5.5

V

V_DD(V)

FIGURE 2-3:

Battery Regulation Voltage

FIGURE 2-6:

Supply Current (I_SS) vs.

(V_BAT) vs. Supply Voltage (V_DD).

Supply Voltage (V_DD).

DS21915A-page 6

 2004 Microchip Technology Inc.

MCP73853/55

2.0

TYPICAL PERFORMANCE CURVES (CONT)

NOTE: Unless otherwise indicated, V_DD= [V_REG(Typ) + 1V], I_OUT= 10 mA and T_A= +25°C.

0.45

0.40

0.35

0.30

0.25

0.20

0.15

0.10

0.05

0.00

1.00

0.90

0.80

0.70

0.60

0.50

0.40

0.30

0.20

V_SET= V_DD

V_DD= V_SS

V_SET= V_DD

I_OUT= 10 mA

+85°C

+25°C

-40°C

2.0

2.4

2.8

3.2

3.6

4.0

4.4

V_BAT(V)

T_A(°C)

FIGURE 2-7:

Output Leakage Current

FIGURE 2-10:

Supply Current (I_SS) vs.

(I_DISCHARGE) vs. Battery Voltage (V_BAT).

Ambient Temperature (T_A).

2.575

4.250

4.230

4.210

4.190

4.170

4.150

MCP73853

_SET= V_DD

I_THREF= 100 µA

V_SET= V_DD

I_OUT= 10 mA

V

2.565

2.555

2.545

2.535

2.525

4.5

4.7

4.9

5.1

5.3

5.5

V_DD(V)

T_A(°C)

FIGURE 2-8:

Thermistor Reference

FIGURE 2-11:

Battery Regulation Voltage

Voltage (V_THREF) vs. Supply Voltage (V_DD).

(V_BAT) vs. Ambient Temperature (T_A).

2.575

MCP73853

_SET= V_DD

I_THREF= 100 µA

MCP73853

V_SET= V_DD

V

2.565

2.555

2.545

2.535

2.525

2.565

2.555

2.545

2.535

2.525

0

25

50

75 100 125 150 175 200

I_THREF(µA)

T_A(°C)

FIGURE 2-9:

Thermistor Reference

FIGURE 2-12:

Thermistor Reference

Voltage (V_THREF) vs. Thermistor Bias Current

(I_THREF).

Voltage (V_THREF) vs. Ambient Temperature (T_A).

 2004 Microchip Technology Inc.

DS21915A-page 7

MCP73853/55

2.0

TYPICAL PERFORMANCE CURVES (CONT)

NOTE: Unless otherwise indicated, V_DD= [V_REG(Typ) + 1V], I_OUT= 10 mA and T_A= +25°C.

FIGURE 2-13:

Line Transient Response.

FIGURE 2-16:

Line Transient Response.

FIGURE 2-14:

Load Transient Response.

FIGURE 2-17:

Load Transient Response.

0

-10

-20

-30

-40

-50

-60

-70

MCP73853

V_DD= 5.2 V

V_AC= 100 mVp-p

I_OUT= 10 mA

-10

-20

-30

-40

-50

-60

-70

C_OUT= 10 µF, Ceramic

MCP73853

V_DD= 5.2 V

V_AC= 100 mVp-p

I_OUT= 100 mA

C_OUT= 10 µF, X7R, Ceramic

-80

0.01

0.1

1

10

100

1000

0.01

0.1

1

10

100

1000

Frequency (kHz)

FIGURE 2-15:

Power Supply Ripple

FIGURE 2-18:

Power Supply Ripple

Rejection.

DS21915A-page 8

 2004 Microchip Technology Inc.

MCP73853/55

2.0

TYPICAL PERFORMANCE CURVES (CONT)

NOTE: Unless otherwise indicated, V_DD= [V_REG(Typ) + 1V], I_OUT= 10 mA, and T_A= +25°C.

500

400

300

200

100

0

300

295

290

285

280

275

270

265

260

255

250

V_SET= V_DD

R_PROG= 1.6 kΩ

OPEN

4.8K

1.6K

536

0

T_A(°C)

R_PROG(Ω)

FIGURE 2-19:

Charge Current (I_OUT) vs.

FIGURE 2-20:

Charge Current (I_OUT) vs.

Programming Resistor (R_PROG).

Ambient Temperature (T_A).

 2004 Microchip Technology Inc.

DS21915A-page 9

MCP73853/55

3.0

PIN DESCRIPTION

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

TABLE 3-1:

MCP73853

PIN FUNCTION TABLE

MCP73855

Sym

Description

1

2

3

V_SET

V_DD1

Voltage Regulation Selection

Battery Management Input Supply

Battery Management 0V Reference

Current Regulation Set

3

—

4

V_DD2

4

V_SS1

5

PROG

THREF

THERM

TIMER

V_SS3

6

—

6

Cell Temperature Sensor Bias

Cell Temperature Sensor Input

Timer Set

7

8

9

—

8

Battery Management 0V Reference

Battery Charge Control Output

Battery Voltage Sense

10

11

12

13

14

15

16

V_BAT1

V_BAT2

V_BAT3

V_SS2

9

—

7

Battery Management 0V Reference

Logic Enable

10

—

1

EN

STAT2

STAT1

Fault Status Output

Charge Status Output

3.1

Voltage Regulation Selection

(V

3.7

Timer Set (TIMER)

)

SET

Connect to V_SSfor 4.1V regulation voltage. Connect to

_DDfor 4.2V regulation voltage.

All safety timers are scaled by C_TIMER/0.1 µF.

3.8

Battery Charge Control Output

(V , V

V

)

BAT2

BAT1

3.2

Battery Management Input Supply

(V , V

Connect to positive terminal of battery. Drain terminal

of internal P-channel MOSFET pass transistor. Bypass

to V_SSwith a minimum of 4.7 µF to ensure loop stability

when the battery is disconnected.

)

DD2

DD1

A supply voltage of [V_REG(Typ) + 0.3V] to 5.5V is

recommended. Bypass to V_SSwith a minimum of

4.7 µF.

3.9

Battery Voltage Sense (V

)

BAT3

3.3

Battery Management 0V Reference

(V , V , V

Voltage sense input. Connect to positive terminal of

battery. A precision internal resistor divider regulates

)

SS3

SS1

SS2

the final voltage on this pin to V_REG

.

Connect to negative terminal of battery.

3.10 Logic Enable (EN)

3.4

Current Regulation Set (PROG)

Input to force charge termination, initiate charge, clear

faults or disable automatic recharge.

Preconditioning, fast and termination currents are

scaled by placing a resistor from PROG to V_SS

.

3.11 Fault Status Output (STAT2)

3.5

Cell Temperature Sensor Bias

(THREF)

Current-limited, open-drain drive for direct connection

to a LED for charge status indication. Alternatively, a

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

microcontroller.

THREF is a voltage reference to bias external

thermistor for continuous cell temperature monitoring

and pre-qualification.

3.12 Charge Status Output (STAT1)

3.6

Cell Temperature Sensor Input

(THERM)

Current-limited, open-drain drive for direct connection

to a LED for charge status indication. Alternatively, a

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

microcontroller.

Input for an external thermistor for continuous cell-

temperature monitoring and prequalification. Connect

to THREF/3 to disable temperature sensing.

DS21915A-page 10

 2004 Microchip Technology Inc.

MCP73853/55

With V_SETtied to V_SS, the MCP7385X devices regulate

to 4.1V. With V_SETtied to V_DD, the MCP7385X devices

regulate to 4.2V.

4.0

DEVICE OVERVIEW

The MCP7385X devices are highly advanced linear

charge management controllers. Refer to the functional

block diagram. Figure 4-2 depicts the operational flow

algorithm from charge initiation to completion and

automatic recharge.

4.4

Charge Cycle Completion and

Automatic Recharge

The MCP7385X devices monitor the charging current

during the Constant-voltage Regulation mode. The

charge cycle is considered complete when either the

charge current has diminished below approximately

7% of the regulation current (I_REG), or the elapsed timer

has expired.

4.1

Charge Qualification and

Preconditioning

Upon insertion of a battery, or application of an external

supply, the MCP7385X devices automatically perform a

series of safety checks to qualify the charge. The input

source voltage must be above the Undervoltage Lock-

out (UVLO) threshold, the enable pin must be above the

logic high level, and the cell temperature monitor must

be within the upper and lower thresholds (MCP73853

only). The qualification parameters are continuously

monitored, with any deviation beyond the limits automat-

ically suspending, or terminating, the charge cycle. The

input voltage must deviate below the UVLO stop

threshold for at least one clock period to be considered

valid.

The MCP7385X devices automatically begin a new

charge cycle when the battery voltage falls below the

recharge threshold (V_RTH), assuming all the qualifica-

tion parameters are met.

4.5

Thermal Regulation

The MCP7385X devices limit the charge current based

on the die temperature. Thermal regulation optimizes

the charge cycle time while maintaining device reliabil-

ity. If thermal regulation is entered, the timer is automat-

ically slowed down to ensure that a charge cycle will

not terminate prematurely. Figure 4-1 depicts the

thermal regulation.

Once the qualification parameters have been met, the

MCP7385X devices initiate a charge cycle. The charge

status output is pulled low throughout the charge cycle

(see Tables 5-1 and 5-2 for charge status outputs). If

the battery voltage is below the preconditioning thresh-

old (V_PTH), the MCP7385X devices precondition the

battery with a trickle charge. The preconditioning

current is set to approximately 10% of the fast charge

regulation current. The preconditioning trickle charge

safely replenishes deeply depleted cells and minimizes

heat dissipation during the initial charge cycle. If the

battery voltage has not exceeded the preconditioning

threshold before the preconditioning timer has expired,

a fault is indicated and the charge cycle is terminated.

450

400

350

Minimum

Maximum

300

250

200

150

100

50

0

20

40

60

80

100

120

140

4.2

Constant Current Regulation –

Fast Charge

Junction Temperature (C)

Preconditioning ends and fast charging begins when

the battery voltage exceeds the preconditioning thresh-

old. Fast charge regulates to a constant current (I_REG),

which is set via an external resistor connected to the

PROG pin. Fast charge continues until either the

FIGURE 4-1:

Current vs. Junction Temperature.

Typical Maximum Charge

4.6

Thermal Shutdown

battery voltage reaches the regulation voltage (V_REG

or the fast charge timer expires; in which case, a fault

is indicated and the charge cycle is terminated.

)

The MCP7385X devices suspend charge if the die

temperature exceeds 155°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.

4.3

Constant Voltage Regulation

When the battery voltage reaches the regulation volt-

age (V_REG), constant voltage regulation begins. The

MCP7385X devices monitor the battery voltage at the

V

_BATpin. This input is tied directly to the positive termi-

nal of the battery. The MCP7385X devices select the

voltage regulation value based on the state of V_SET

.

 2004 Microchip Technology Inc.

DS21915A-page 11

MCP73853/55

Figure 6-1 depicts a typical application circuit with

connection of the THERM input. The resistor values of

R_T1and R_T2are calculated with the following

equations.

5.0

DETAILED DESCRIPTION

5.1

Analog Circuitry

For NTC thermistors:

5.1.1

BATTERY MANAGEMENT INPUT

SUPPLY (V_DD1, V_DD2

)

2 × R_COLD× R_HOT

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

R_T1

=

R

_COLD– R_HOT

The V_DDinput is the input supply to the MCP7385X

devices. The MCP7385X devices automatically enter a

power-down mode if the voltage on the V_DDinput falls

below the UVLO voltage (V_STOP). This feature prevents

draining the battery pack when the V_DDsupply is not

present.

2 × R_COLD× R_HOT

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

R_T2

=

R

_COLD– 3 × R_HOT

For PTC thermistors:

2 × R_COLD× R_HOT

5.1.2

PROG INPUT

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

R_T1

=

R

_HOT– R_COLD

Fast charge current regulation can be scaled by placing

a programming resistor (R_PROG) from the PROG input

to V_SS. Connecting the PROG input to V_SSallows for a

maximum fast charge current of 400 mA, typically. The

minimum fast charge current is 85 mA (Typ) and is set

by letting the PROG input float. Equation 5-1 calculates

2 × R_COLD× R_HOT

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

_HOT– 3 × R_COLD

R_T2

=

R

Where:

the value for R_PROG

.

R_COLDand R_HOTare the thermistor

resistance values at the temperature window

of interest.

EQUATION 5-1:

13.32 – 33.3 × I_REG

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

14.1 × I_REG– 1.2

Applying a voltage equal to V_THREF/3 to the THERM

input disables temperature monitoring.

R_PROG

=

Where:

5.1.5

TIMER SET INPUT (TIMER)

I_REGis the desired fast charge current in

amps

The TIMER input programs the period of the safety tim-

ers by placing a timing capacitor (C_TIMER) between the

TIMER input pin and V_SS. Three safety timers are

programmed via the timing capacitor.

R_PROGis in kilo-ohms.

The preconditioning trickle charge current and the

charge termination current are scaled to approximately

10% and 7% of I_REG, respectively.

The preconditioning safety timer period:

C_TIMER

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

× 1.0Hours

t_PRECON

=

0.1µF

5.1.3

CELL TEMPERATURE SENSOR

BIAS (THREF)

The fast charge safety timer period:

A 2.55V voltage reference is provided to bias an exter-

nal thermistor for continuous cell temperature monitor-

C_TIMER

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

× 1.5Hours

t_FAST

=

0.1µF

ing and prequalification.

comparison is performed at threshold levels of

_THREF/2 and V_THREF/4.

A ratio-metric window

V

And, the elapsed time termination period:

C_TIMER

5.1.4

CELL TEMPERATURE SENSOR

INPUT (THERM)

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

× 3.0Hours

t_TERM

=

0.1µF

The MCP73853 continuously monitors temperature by

comparing the voltage between the THERM input and

V_SSwith the upper and lower temperature thresholds.

A negative or positive temperature coefficient, NTC or

PTC thermistor and an external voltage divider typically

develops this voltage. The temperature-sensing circuit

has its own reference to which it performs a ratio-metric

comparison. Therefore, it is immune to fluctuations in

the supply input (V_DD). The temperature-sensing circuit

is removed from the system when V_DDis not applied,

eliminating additional discharge of the battery pack.

The preconditioning timer starts after qualification and

resets when the charge cycle transitions to the

constant-current, fast charge phase. The fast charge

timer and the elapsed timer start after the MCP7385X

devices transition from preconditioning. The fast

charge timer resets when the charge cycle transitions

to the Constant-voltage mode. The elapsed timer will

expire and terminate the charge if the sensed current

does not diminish below the termination threshold.

During thermal regulation, the timer is slowed down

proportional to the charge current.

 2004 Microchip Technology Inc.

DS21915A-page 13

MCP73853/55

5.1.6

BATTERY VOLTAGE SENSE (V_BAT3)

TABLE 5-2:

STATUS OUTPUT – MCP73855

The MCP73853 monitors the battery voltage at the

V_BAT3pin. This input is tied directly to the positive

terminal of the battery pack.

CHARGE CYCLE STATE

STAT1

Qualification

OFF

ON

Preconditioning

Constant Current Fast Charge

Constant Voltage

Charge Complete

Fault

5.1.7

BATTERY CHARGE CONTROL

OUTPUT (V_BAT1, V_BAT2

ON

)

ON

The battery charge control output is the drain terminal of

an internal P-channel MOSFET. The MCP7385X

devices provide constant-current and constant-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.

OFF

Flashing (1Hz,

50% duty cycle)

THERM Invalid

Flashing (1Hz,

50% duty cycle)

Disabled - Sleep mode

OFF

Input Voltage Disconnected

5.2

Digital Circuitry

Note:

OFF state: open-drain is high impedance;

ON state: open-drain can sink current, typ-

ically 7 mA; FLASHING: toggles between

OFF state and ON state.

5.2.1

CHARGE STATUS OUTPUTS

(STAT1,STAT2)

Two status outputs provide information on the state of

charge for the MCP73853. One status output provides

information on the state of charge for the MCP73855.

The current-limited, open-drain outputs can be used to

illuminate external LEDs. Optionally, a pull-up resistor

can be used on the output for communication with a

host microcontroller. Table 5-1 and Table 5-2 summa-

rize the state of the status outputs during a charge

cycle for the MCP73853 and MCP73855, respectively.

The flashing rate (1 Hz) is based off a timer capacitor

(C_TIMER) of 0.1 µF. The rate will vary based on the

value of the timer capacitor.

5.2.1.1

MCP73853 Only

STAT2 is on whenever the input voltage is above the

under voltage lockout, the device is enabled, and all

conditions are normal.

During a fault condition, the STAT1 status output will be

off and the STAT2 status output will flash. To recover

from a fault condition, the input voltage must be

removed and then reapplied, or the enable input, EN,

must be de-asserted to a logic-low, then asserted to a

logic-high.

TABLE 5-1: STATUS OUTPUTS – MCP73853

CHARGE

STAT1

STAT2

CYCLE STATE

Qualification

OFF

ON

OFF

Preconditioning

When the voltage on the THERM input is outside the

preset window, the charge cycle will either not start or

be suspended. However, the charge cycle is not termi-

nated, with recovery beng automatic. The charge cycle

will resume (or start) once the THERM input is valid and

all other qualification parameters are met.

Constant-

current Fast

Charge

ON

Constant-

voltage

ON

OFF

ON

Charge

Complete

Flashing (1 Hz,

50% duty cycle)

5.2.2

V_SETINPUT

Fault

OFF

The V_SETinput selects the regulated output voltage of

the MCP7385X devices. With V_SETtied to V_SS, the

MCP7385X devices regulate to 4.1V. With V_SETtied to

THERM Invalid

Flashing (1 Hz,

50% duty cycle)

V_DD, the MCP7385X devices regulate to 4.2V.

Disabled -

Sleep mode

OFF

5.2.3 LOGIC ENABLE (EN)

Input Voltage

Disconnected

OFF

The logic enable input pin (EN) can be used to termi-

nate a charge anytime during the charge cycle, initiate

a charge cycle or initiate a recharge cycle.

Note:

OFF state: open-drain is high-impedance;

ON state: open-drain can sink current,

typically 7 mA; FLASHING: toggles

between OFF and ON states.

Applying a logic-high input signal to the EN pin, or tying

it to the input source, enables the device. Applying a

logic-low input signal disables the device and termi-

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

supply current is reduced to 0.28 µA, typically.

DS21915A-page 14

 2004 Microchip Technology Inc.

MCP73853/55

cells, constant current followed by constant voltage.

Figure 6-1 depicts a typical stand-alone application

circuit, while Figures 6-2 and 6-3 depict the

accompanying charge profile.

6.0

APPLICATIONS

The MCP7385X devices are designed to operate in

conjunction with a host microcontroller or in stand-

alone applications. The MCP7385X devices provide

the preferred charge algorithm for Li-Ion/Li-Polymer

Regulated Wall Cube

STAT1

EN V_SS2

or

16 15 14 13

USB Power Bus

V_SET

V_DD1

V_DD2

V_SS1

V_BAT3

12

1

2

3

4

+

-

Single

Lithium-Ion

Cell

V_BAT2

V_BAT1

V_SS3

11

10

9

MCP73853

5

6

7

8

PROG

R_PROG

TIMER

C_TIMER

R_T1

R_T2

FIGURE 6-1:

Typical Application Circuit.

Preconditioning

Mode

Constant-current

Mode

Constant-voltage

Mode

Regulation

Voltage

(V

)

REG

Regulation

Current

(I

)

REG

Charge

Voltage

Transition

Threshold

(V

)

PTH

Precondition

Current

Charge

Current

(I

)

PREG

Termination

Current

(I

)

TERM

Precondition

Safety Timer

Fast Charge

Safety Timer

Elapsed Time

Termination Timer

FIGURE 6-2:

Typical Charge Profile.

 2004 Microchip Technology Inc.

DS21915A-page 15

MCP73853/55

Preconditioning

Mode

Constant-current

Mode

Constant-voltage

Mode

Regulation

Voltage

(V

)

REG

Regulation

Current

(I

)

REG

Charge

Voltage

Transition

Threshold

(V

)

PTH

Precondition

Current

Charge

Current

(I

)

PREG

Termination

Current

(I

)

TERM

Precondition

Safety Timer

Fast Charge

Safety Timer

Elapsed Time

Termination Timer

FIGURE 6-3:

Typical Charge Profile in Thermal Regulation.

DS21915A-page 16

 2004 Microchip Technology Inc.

MCP73853/55

6.1.1.3

EXTERNAL CAPACITORS

6.1

Application Circuit Design

Due to the low efficiency of linear charging, the most

important factors are thermal design and cost. These

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

exists 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.

The MCP7385X devices are 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 intercon-

nections 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.

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 up to

the maximum output current.

6.1.1

COMPONENT SELECTION

Selection of the external components in Figure 6-1 is

crucial to the integrity and reliability of the charging sys-

tem. The following discussion is intended to be a guide

for the component selection process.

6.1.1.1

CURRENT PROGRAMMING RESISTOR

(R_PROG

)

6.1.1.4

REVERSE BLOCKING PROTECTION

The preferred fast charge current for Lithium-Ion cells

is at the 1C rate, with an absolute maximum current at

the 2C rate. For example, a 500 mAH battery pack has

a preferred fast charge current of 500 mA. Charging at

this rate provides the shortest charge cycle times

without degradation to the battery pack performance or

life.

The MCP7385X devices provide protection from a

faulted or shorted input or from a reversed-polarity

input source. Without the protection, a faulted or

shorted input would discharge the battery pack through

the body diode of the internal pass transistor.

6.1.1.5

ENABLE INTERFACE

400 mA is the typical maximum charge current

obtainable from the MCP7385X devices. For this situa-

tion, the PROG input should be connected directly to

In the stand-alone configuration, the enable pin is gen-

erally tied to the input voltage. The MCP7385X devices

automatically enter a low power mode when voltage on

the V_DDinput falls below the UVLO voltage (V_STOP),

reducing the battery drain current to 0.28 µA, typically.

V_SS

.

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:

6.1.1.6

CHARGE STATUS INTERFACE

Two status outputs provide information on the state of

charge. The current-limited, open-drain outputs can be

used to illuminate external LEDs. Refer to Table 5-1

and Table 5-2 for a summary of the state of the status

output during a charge cycle.

PowerDissipation = (V

– V

) × I

DDMAX

PTHMIN

REGMAX

6.2

PCB Layout Issues

Where V_DDMAXis the maximum input voltage

(I_REGMAX) is the maximum fast charge current, and

V_PTHMINis the minimum transition threshold voltage.

Power dissipation with a 5V, +/-10% input voltage

source is:

For optimum voltage regulation, place the battery pack

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

It is recommended that the designer minimize voltage

drops along the high-current-carrying PCB traces.

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.

PowerDissipation = (5.5V – 2.7V) × 475mA = 1.33W

With the battery charger mounted on a 1 in²pad of

1 oz. copper, the junction temperature rise is approxi-

mately 50°C. This would allow for a maximum operat-

ing ambient temperature of 35°C before thermal

regulation is entered.

 2004 Microchip Technology Inc.

DS21915A-page 17

MCP73853/55

7.0

7.1

PACKAGING INFORMATION

Package Marking Information

16-Lead QFN (MCP73853)

Example

XXXXXXX

YYWWNNN

73853

I/ML

0429256

10-Lead DFN (MCP73855)

Example

3855

I429

256

XXXX

XYWW

NNN

Legend: XX...X Customer specific information*

YY

WW

NNN

Year code (last 2 digits of calendar year)

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

Alphanumeric traceability code

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.

*

Standard OTP marking consists of Microchip part number, year code, week code, and traceability code.

DS21915A-page 18

 2004 Microchip Technology Inc.

MCP73853/55

16-Lead Plastic Quad Flat No Lead Package (ML) 4x4x0.9 mm Body (QFN) – Saw Singulated

D

D1

EXPOSED

METAL

PAD

e

E1

E

2

1

b

n

OPTIONAL

INDEX

L

TOP VIEW

BOTTOM VIEW

AREA

A3

A

A1

Units

Dimension Limits

INCHES

MILLIMETERS*

MIN

NOM

16

MAX

MIN

NOM

16

MAX

n

e

Number of Pins

Pitch

.026 BSC

0.65 BSC

0.90

Overall Height

Standoff

A

.031

.035

.001

.008 REF

.039

0.80

1.00

A1

A3

E

.000

.002

0.00

0.02

0.05

Contact Thickness

Overall Width

Exposed Pad Width

Overall Length

Exposed Pad Length

Contact Width

Contact Length

0.20 REF

4.00

.152

.100

.152

.100

.010

.012

.157

.106

.157

.106

.012

.016

.163

.110

.163

.110

.014

.020

3.85

2.55

3.85

2.55

0.25

0.30

4.15

2.80

4.15

2.80

0.35

0.50

E2

D

2.70

4.00

D2

b

2.70

0.30

L

0.40

*Controlling Parameter

Notes:

JEDEC equivalent: MO-220

Drawing No. C04-127

Revised 04-24-05

 2004 Microchip Technology Inc.

DS21915A-page 19

MCP73853/55

10-Lead Plastic Dual Flat No Lead Package (MF) 3x3x0.9 mm Body (DFN) – Saw Singulated

p

b

E

n

L

D

D2

EXPOSED

METAL

PAD

2

1

PIN 1

ID INDEX

AREA

E2

TOP VIEW

BOTTOM VIEW

(NOTE 2)

A

EXPOSED

TIE BAR

A3

A1

(NOTE 1)

Units

INCHES

NOM

MILLIMETERS*

Dimension Limits

MIN

MAX

MIN

NOM

10

MAX

n

e

Number of Pins

Pitch

10

.020 BSC

0.50 BSC

0.90

Overall Height

Standoff

A

.031

.035

.001

.008 REF.

.039

.002

0.80

1.00

A1

A3

E

.000

0.00

0.02

0.05

Lead Thickness

Overall Length

Exposed Pad Length

Overall Width

Exposed Pad Width

Lead Width

0.20 REF.

3.00

.112

.055

.112

.047

.008

.012

.118

--

.124

.096

.124

.069

.015

.020

2.85

1.39

2.85

1.20

0.18

0.30

3.15

2.45

3.15

1.75

0.30

0.50

(Note 3)

E2

D

--

.118

--

3.00

D2

b

--

.010

.016

0.25

Lead Length

L

0.40

*Controlling Parameter

Notes:

1. Package may have one or more exposed tie bars at ends.

2. Pin 1 visual index feature may vary, but must be located within the hatched area.

3. Exposed pad dimensions vary with paddle size.

4. JEDEC equivalent: Not registered

Drawing No. C04-063

Revised 05/24/04

DS21915A-page 20

 2004 Microchip Technology Inc.

MCP73853/55

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

X

XX

a)

MCP73853T-I/ML: Tape and Reel,

Temperature Package

Range

USB compatible charge

controller with tempera-

ture monitor

b)

MCP73853-I/ML: USB compatible charge

controller with tempera-

ture monitor

Device

MCP73853:

USB compatible charge controller with tem-

perature monitor

a)

b)

MCP73855T-I/MF: Tape and Reel,

USB compatible charge

controller

MCP73855-I/MF: USB compatible charge

controller

MCP73853T: USB compatible charge controller with tem-

perature monitor, Tape and Reel

MCP73855:

USB compatible charge controller

MCP73855T: USB compatible charge controller,

Tape and Reel

Temperature Range

Package

I

= -40°C to +85°C (Industrial)

ML

MF

=

Plastic Quad Flat No Lead, 4x4 mm Body (QFN),

16-Lead

=

Plastic Dual Flat No Lead, 3x3 mm Body (DFN),

10-Lead

Sales and Support

Data Sheets

Products supported by a preliminary Data Sheet may have an errata sheet describing minor operational differences and

recommended workarounds. To determine if an errata sheet exists for a particular device, please contact one of the following:

1. Your local Microchip sales office

2. The Microchip Worldwide Site (www.microchip.com)

Please specify which device, revision of silicon and Data Sheet (include Literature #) you are using.

Customer Notification System

Register on our web site (www.microchip.com) to receive the most current information on our products.

 2004 Microchip Technology Inc.

DS21915A-page 21

MCP73853/55

NOTES:

DS21915A-page 22

 2004 Microchip Technology Inc.

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 WAR-

RANTIES 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’s products as critical components in

life support systems is not authorized except with express

written approval by Microchip. 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, microID, MPLAB, PIC, PICmicro,

PICSTART, PRO MATE, PowerSmart, rfPIC, and

SmartShunt are registered trademarks of Microchip

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

AmpLab, FilterLab, MXDEV, MXLAB, PICMASTER, 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, dsPICDEM,

dsPICDEM.net, dsPICworks, ECAN, ECONOMONITOR,

FanSense, FlexROM, fuzzyLAB, In-Circuit Serial

Programming, ICSP, ICEPIC, Migratable Memory, MPASM,

MPLIB, MPLINK, MPSIM, PICkit, PICDEM, PICDEM.net,

PICLAB, PICtail, PowerCal, PowerInfo, PowerMate,

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SmartTel and Total Endurance are trademarks of Microchip

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SQTP is a service mark of Microchip Technology Incorporated

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All other trademarks mentioned herein are property of their

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Printed on recycled paper.

Microchip received ISO/TS-16949:2002 quality system certification for

its worldwide headquarters, design and wafer fabrication facilities in

Chandler and Tempe, Arizona and Mountain View, California in

October 2003. The Company’s quality system processes and

procedures are for its PICmicro^®8-bit MCUs, 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.

 2004 Microchip Technology Inc.

DS21915A-page 23

WORLDWIDE SALES AND SERVICE

AMERICAS

ASIA/PACIFIC

EUROPE

Corporate Office

Australia - Sydney

Tel: 61-2-9868-6733

Fax: 61-2-9868-6755

India - Bangalore

Tel: 91-80-2229-0061

Fax: 91-80-2229-0062

Austria - Weis

Tel: 43-7242-2244-399

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

China - Beijing

Tel: 86-10-8528-2100

Fax: 86-10-8528-2104

Denmark - Ballerup

Tel: 45-4450-2828

Fax: 45-4485-2829

India - New Delhi

Tel: 91-11-5160-8631

Fax: 91-11-5160-8632

China - Chengdu

Tel: 86-28-8676-6200

Fax: 86-28-8676-6599

France - Massy

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

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

Japan - Kanagawa

Tel: 81-45-471- 6166

Fax: 81-45-471-6122

Atlanta

China - Fuzhou

Tel: 86-591-8750-3506

Fax: 86-591-8750-3521

Germany - Ismaning

Tel: 49-89-627-144-0

Fax: 49-89-627-144-44

Korea - Seoul

Alpharetta, GA

Tel: 770-640-0034

Fax: 770-640-0307

Tel: 82-2-554-7200

Fax: 82-2-558-5932 or

82-2-558-5934

Italy - Milan

Tel: 39-0331-742611

Fax: 39-0331-466781

China - Hong Kong SAR

Tel: 852-2401-1200

Fax: 852-2401-3431

Boston

Singapore

Tel: 65-6334-8870

Fax: 65-6334-8850

Westford, MA

Tel: 978-692-3848

Fax: 978-692-3821

Netherlands - Drunen

Tel: 31-416-690399

Fax: 31-416-690340

China - Shanghai

Tel: 86-21-5407-5533

Fax: 86-21-5407-5066

China - Shenyang

Tel: 86-24-2334-2829

Fax: 86-24-2334-2393

Taiwan - Kaohsiung

Tel: 886-7-536-4818

Fax: 886-7-536-4803

Chicago

Itasca, IL

Tel: 630-285-0071

Fax: 630-285-0075

England - Berkshire

Tel: 44-118-921-5869

Fax: 44-118-921-5820

Taiwan - Taipei

Tel: 886-2-2500-6610

Fax: 886-2-2508-0102

Dallas

Addison, TX

China - Shenzhen

Tel: 86-755-8203-2660

Fax: 86-755-8203-1760

Tel: 972-818-7423

Fax: 972-818-2924

Taiwan - Hsinchu

Tel: 886-3-572-9526

Fax: 886-3-572-6459

China - Shunde

Detroit

Tel: 86-757-2839-5507

Fax: 86-757-2839-5571

Farmington Hills, MI

Tel: 248-538-2250

Fax: 248-538-2260

China - Qingdao

Tel: 86-532-502-7355

Fax: 86-532-502-7205

Kokomo

Kokomo, IN

Tel: 765-864-8360

Fax: 765-864-8387

Los Angeles

Mission Viejo, CA

Tel: 949-462-9523

Fax: 949-462-9608

San Jose

Mountain View, CA

Tel: 650-215-1444

Fax: 650-961-0286

Toronto

Mississauga, Ontario,

Canada

Tel: 905-673-0699

Fax: 905-673-6509

10/20/04

DS21915A-page 24

 2004 Microchip Technology Inc.


型号：	MCP73855T-MF
厂家：	MICROCHIP
描述：	USB Compatible Li-Ion/Li-Polymer Charge Management Controllers
文件：	总24页 (文件大小：275K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

MCP73855T-MF [MICROCHIP]

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