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MCP73861/2/3/4

5.0

5.1

5.1.1

DETAILED DESCRIPTION

Analog Circuitry

BATTERY MANAGEMENT INPUT

SUPPLY (V

DD1

, V

DD2

)

Figure 6-1 depicts a typical application circuit with

connection of the THERM input. The resistor values of

R

T1

and R

T2

are calculated with the following

equations.

For NTC thermistors:

2

脳

R

COLD

脳

R

HOT

R

T1

= ----------------------------------------------

R

COLD

鈥?/div>

R

HOT

2

脳

R

COLD

脳

R

HOT

R

T2

= ----------------------------------------------

R

COLD

鈥?/div>

3

脳

R

HOT

For PTC thermistors:

2

脳

R

COLD

脳

R

HOT

R

T1

= ----------------------------------------------

R

HOT

鈥?/div>

R

COLD

2

脳

R

COLD

脳

R

HOT

R

T2

= ----------------------------------------------

R

HOT

鈥?/div>

3

脳

R

COLD

Where:

R

COLD

and R

HOT

are the thermistor

resistance values at the temperature window

of interest.

Applying a voltage equal to V

THREF

/3 to the THERM

input disables temperature monitoring.

The V

DD

input is the input supply to the MCP7386X.

The MCP7386X automatically enters a Power-down

mode if the voltage on the V

DD

input falls below the

UVLO voltage (V

STOP

). This feature prevents draining

the battery pack when the V

DD

supply is not present.

5.1.2

PROG INPUT

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

SS

allows for a

maximum fast charge current of 1.2A, typically. The

minimum fast charge current is 100 mA, set by letting

the PROG input float. The following formula calculates

the value for R

PROG

:

13.2

鈥?/div>

11

脳

I

REG

R

PROG

= ----------------------------------------

12

脳

I

REG

鈥?/div>

1.2

where:

I

REG

= the desired fast charge current in amps.

R

PROG

= measured in k惟.

The preconditioning trickle-charge current and the

charge termination current are scaled to approximately

10% and 8% of I

REG

, respectively.

5.1.5

TIMER SET INPUT (TIMER)

The TIMER input programs the period of the safety

timers by placing a timing capacitor (C

TIMER

) between

the TIMER input pin and V

SS

. Three safety timers are

programmed via the timing capacitor.

The preconditioning safety timer period:

C

TIMER

-

t

PRECON

= ------------------

脳

1.0Hour s

0.1渭F

The fast charge safety timer period:

C

TIMER

-

t

FAST

= ------------------

脳

1.5Hours

0.1渭F

The elapsed time termination period:

C

TIMER

-

t

TERM

= ------------------

脳

3.0Hours

0.1渭F

The preconditioning timer starts after qualification and

resets when the charge cycle transitions to the fast

charge, Constant-current mode. The fast charge timer

and the elapsed timer start once the MCP7386X

transitions 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.

5.1.3

CELL TEMPERATURE SENSOR

BIAS (THREF)

A 2.5V voltage reference is provided to bias an external

thermistor for continuous cell temperature monitoring

and prequalification. A ratio metric window comparison

is performed at threshold levels of V

THREF

/2 and

V

THREF

/4.

5.1.4

CELL TEMPERATURE SENSOR

INPUT (THERM)

The MCP73861/2/3/4 continuously monitors tempera-

ture by comparing the voltage between the THERM

input and V

SS

with the upper and lower temperature

thresholds. A negative or positive temperature

coefficient, NTC or PTC thermistor and an external

voltage-divider typically develop 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

DD

is not applied, eliminating additional

discharge of the battery pack.

漏

2005 Microchip Technology Inc.

DS21893C-page 15

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MCP73864T-I/ML 产品属性

制造商
Microchip
产品种类
电池管理
电池类型
Li-Ion, Li-Poly
输出电压
8.2 V, 8.4 V
输出电流
1200 mA
最大工作温度
+ 85 C
最小工作温度
- 40 C
封装 / 箱体
QFN
封装
Reel
安装风格
SMD/SMT
工厂包装数量
3300

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