MCP73862-I/ML Microchip Technology, MCP73862-I/ML Datasheet - Page 21

• 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
operating 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
interconnections appear inductive at high frequencies.
These elements are in the control feedback loop during
Constant-voltage
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 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
generally tied to the input voltage. The MCP7386X
automatically enters a Low-power mode when voltage
on the V
reducing the battery drain current to 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
a summary of the state of the status outputs during a
charge cycle.
© 2008 Microchip Technology Inc.
PowerDissipation
DD
load.
input falls below the UVLO voltage (V
External Capacitors
Reverse-Blocking Protection
Enable Interface
Charge Status Interface
In
mode.
=
addition,
(
5.5V 2.7V
–
Therefore,
BAT
) 575mA
the
×
pin to V
battery
the
Table 5-1
=
2
SS
1.61W
bypass
pad of
STOP
. This
and
for
),
6.2
For optimum voltage regulation, place the battery pack
as close as possible to the device’s V
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 backplane of the PCB, thus reducing the maximum
junction temperature.
PCB Layout Issues
MCP73861/2/3/4
DS21893D-page 21
BAT
and V
SS
pins,