MCP73861 Datasheet

IC型号：
MCP73861
PDF描述：
Advanced Single or Dual Cell, Fully Integrated Li-Ion /Li-Po...
文件大小：
773.90KB
PDF页数：
34页
芯片厂家：
Microchip

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MCP73861/2

Power dissipation with a 5V, 卤10% input voltage source

is:

PowerDissipation

(

5.5V

鈥?/div>

2.7V

) 脳

575mA

1.61W

6.2

PCB Layout Issues

With the battery charger mounted on a 1 in

pad of

1 oz. copper, the junction temperature rise is 60掳C,

approximately. This would allow for a maximum operat-

ing ambient temperature of 50掳C before thermal

regulation is entered.

For optimum voltage regulation, place the battery pack

as close as possible to the device鈥檚 V

BAT

and V

pins.

It is recommended to 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 back-plane of the PCB, thus reducing the maximum

junction temperature.

6.1.1.3

External Capacitors

The MCP7386X is stable with or without a battery load.

In order to maintain good AC stability in the Constant

Voltage mode, a minimum capacitance of 4.7 碌F is

recommended to bypass the V

BAT

pin to V

. This

capacitance provides compensation when there is no

battery load. In addition, the battery and interconnec-

tions appear inductive at high frequencies. These

elements are in the control feedback loop during

constant voltage mode. Therefore, the bypass capaci-

tance 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鈥檚 minimum Effec-

tive Series Resistance (ESR) value. The actual value of

the capacitor and its associated ESR depends on the

output load current. A 4.7 碌F ceramic, tantalum or alu-

minum electrolytic capacitor at the output is usually

sufficient to ensure stability for up to a 1A output

current.

6.1.1.4

Reverse-Blocking Protection

The MCP7386X provides 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

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

erally tied to the input voltage. The MCP7386X auto-

matically enters a low-power mode when voltage on

the V

input falls below the undervoltage lockout

voltage (V

STOP

) reducing the battery drain current to

0.23 碌A, typically.

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 for

a summary of the state of the status outputs during a

charge cycle.

铮?/div>

2004 Microchip Technology Inc.

DS21893A-page 19

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