MCP73862-I/ML Microchip Technology, MCP73862-I/ML Datasheet - Page 19

• Manufacturer Part Number: MCP73862-I/ML
• Description: IC CONTROLLER LI-ION 8.7V 16QFN
• Manufacturer: Microchip Technology

Specifications of MCP73862-I/ML

• Function: Charge Management
• Battery Type: Lithium-Ion (Li-Ion), Lithium-Polymer (Li-Pol)
• Voltage - Supply: 8.7 V ~ 12 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 16-QFN
• Product: Charge Management
• Output Voltage: 8.442 V
• Output Current: 1200 mA
• Operating Supply Voltage: 8.7 V to 12 V
• Supply Current: 4 mA
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• Uvlo Start Threshold: 9.05 V
• Uvlo Stop Threshold: 8.95 V
• Lead Free Status / RoHS Status: Request inventory verification / Request inventory verification

Power dissipation with a 5V, ±10% input voltage source
is:
With the battery charger mounted on a 1 in
1 oz. copper, the junction temperature rise is 60°C,
approximately. This would allow for a maximum operat-
ing ambient temperature of 50°C before thermal
regulation is entered.
6.1.1.3
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 µF is
recommended to bypass the V
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’s 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 µF 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
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
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
voltage (V
0.23 µA, typically.
6.1.1.6
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.
 2004 Microchip Technology Inc.
PowerDissipation
DD
input falls below the undervoltage lockout
STOP
External Capacitors
Reverse-Blocking Protection
Enable Interface
Charge Status Interface
) reducing the battery drain current to
=
5.5V 2.7V
–
BAT
575mA
pin to V
=
2
1.61W
SS
pad of
. This
6.2
For optimum voltage regulation, place the battery pack
as close as possible to the device’s V
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.
PCB Layout Issues
MCP73861/2
DS21893A-page 19
BAT
and V
SS
pins.