MCP73844-840I/MS Microchip Technology, MCP73844-840I/MS Datasheet - Page 14

• Manufacturer Part Number: MCP73844-840I/MS
• Description: IC CONTROLLER LI-ION 8.4V 8MSOP
• Manufacturer: Microchip Technology

Specifications of MCP73844-840I/MS

• Battery Type: Lithium-Ion (Li-Ion), Lithium-Polymer (Li-Pol)
• Package / Case: 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
• Function: Charge Management
• Voltage - Supply: 8.7 V ~ 12 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Output Voltage: 8.442 V
• Output Current: 10 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: 8.90 V
• Uvlo Stop Threshold: 8.85 V
• Input Voltage: 12V
• Battery Charge Voltage: 8.4V
• Charge Current Max: 10mA
• Battery Ic Case Style: MSOP
• No. Of Pins: 8
• No. Of Series Cells: 2
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: MCP7383XRD-PPM - REFERENCE DESIGN PWR-PTH MCP7383MCP7384XEV - KIT EVALUATION FOR MCP7384X
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

MCP73841/2/3/4
5.1.6
The MCP7384X monitors the battery voltage at the
V
terminal of the battery. The MCP7384X is offered in
four fixed-voltage versions for single or dual series cell
battery packs, with either coke or graphite anodes:
5.1.7
The MCP7384X controls the gate drive to an external
P-channel MOSFET. The P-channel MOSFET is
controlled in the linear region regulating current and
voltage supplied to the cell. The drive output is
automatically turned off when the voltage on the V
input falls below the undervoltage lockout voltage
(V
DS21823C-page 14
BAT
- 4.1V (MCP73841-4.1, MCP73843-4.1)
- 4.2V (MCP73841-4.2, MCP73843-4.2)
- 8.2V (MCP73842-8.2, MCP73844-8.2)
- 8.4V (MCP73842-8.4, MCP73844-8.4)
STOP
pin. This input is tied directly to the positive
).
BATTERY VOLTAGE SENSE (V
DRIVE OUTPUT (DRV)
BAT
DD
)
5.2
5.2.1
A status output provides information on the state-of-
charge. The current-limited, open-drain output can be
used to illuminate an external LED. Optionally, a pull-up
resistor can be used on the output for communication
with a host microcontroller. Table 5-1 summarizes the
state of the status output during a charge cycle.
TABLE 5-1:
The flashing rate (1 Hz) is based off a timer capacitor
(C
value of the timer capacitor.
5.2.2
The logic-enable input pin (EN) can be used to
terminate a charge anytime during the charge cycle,
initiate a charge cycle or initiate a recharge cycle.
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
terminates a charge cycle. When disabled, the device’s
supply current is reduced to 0.25 µA, typically.
Qualification
Preconditioning
Constant-Current Fast
Charge
Constant-Voltage
Charge Complete
Safety Timer Fault
Cell Temperature Invalid
Disabled - Sleep mode
Battery Disconnected
TIMER
Charge Cycle State
) of 0.1 µF. The rate will vary based on the
Digital Circuitry
CHARGE STATUS OUTPUT (STAT1)
LOGIC ENABLE (EN)
STATUS OUTPUTS
 2004 Microchip Technology Inc.
(1 Hz, 50% duty cycle)
(1 Hz, 50% duty cycle)
Flashing
Flashing
Stat1
OFF
OFF
OFF
OFF
ON
ON
ON