MCP73827-4.1VUATR Microchip Technology, MCP73827-4.1VUATR Datasheet - Page 9

• Manufacturer Part Number: MCP73827-4.1VUATR
• Description: IC CONTROLLR LI-ION 4.1V 8-MSOP
• Manufacturer: Microchip Technology

Specifications of MCP73827-4.1VUATR

• Function: Charge Management
• Battery Type: Lithium-Ion (Li-Ion)
• Voltage - Supply: 4.5 V ~ 5.5 V
• Operating Temperature: -20°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
• Output Voltage: 4.141 V
• Operating Supply Voltage: 4.5 V to 5.5 V
• Supply Current: 560 mA
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 20 C
• Mounting Style: SMD/SMT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: MCP738274.1VUATR

4.0
The MCP73827 is a linear charge management con-
troller. Refer to the functional block diagram on page 2
and the typical application circuit, Figure 6-1.
4.1
Upon insertion of a battery or application of an external
supply, the MCP73827 verifies the state of the SHDN
pin. The SHDN pin must be above the logic High level.
If the SHDN pin is above the logic High level, the
MCP73827 initiates a charge cycle. The charge status
output, MODE, is pulled low throughout throughout the
preconditioning and controlled current phases (see
Table 5-1 for charge status outputs). If the cell is below
the preconditioning threshold, 2.4V typically, the
MCP73827 preconditions the cell with a scaled back
current. The preconditioning current is set to approxi-
mately 43% of the fast charge peak current. The pre-
conditioning safely replenishes deeply depleted cells
and minimizes heat dissipation in the external pass
transistor during the initial charge cycle.
4.2
Preconditioning ends and fast charging begins when
the cell voltage exceeds the preconditioning threshold.
Fast charge utilizes a foldback current scheme based
on the voltage at the V
across an external sense resistor, R
put voltage, V
voltage reaches the regulation voltage, V
© 2007 Microchip Technology Inc.
DEVICE OVERVIEW
Charge Qualification and
Preconditioning
Controlled Current Regulation - Fast
Charge
BAT
. Fast charge continues until the cell
SNS
input developed by the drop
SENSE
REG
, and the out-
.
4.3
When the cell voltage reaches the regulation voltage,
V
MCP73827 monitors the cell voltage at the V
This input is tied directly to the positive terminal of the
battery. The MCP73827 is offered in two fixed-voltage
versions for battery packs with either coke or graphite
anodes:
(MCP73827-4.2).
4.4
The charge cycle can be terminated by a host micro-
controller when the output of the charge current moni-
tor, I
the peak output voltage level. Alternatively, the transi-
tion of the charge status output, MODE, can be used to
initialize a timer to terminate the charge. The charge is
terminated by pulling the shutdown pin, SHDN, to a
logic Low Level.
REG
MON
, constant voltage regulation begins. The
, has diminished below approximately 10% of
Constant Voltage Regulation
Charge Cycle Completion
4.1V
(MCP73827-4.1)
MCP73827
DS21704B-page 9
and
BAT
4.2V
pin.