MCP73828-4.1VUATR Microchip Technology, MCP73828-4.1VUATR Datasheet - Page 9

• Manufacturer Part Number: MCP73828-4.1VUATR
• Description: IC CONTROLLR LI-ION 4.1V 8-MSOP
• Manufacturer: Microchip Technology

Specifications of MCP73828-4.1VUATR

• 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
• Uvlo Start Threshold: 113 mV
• Uvlo Stop Threshold: 839 mV
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: MCP738284.1VUATR

4.0
The MCP73828 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 MCP73828 automatically performs a series
of safety checks to qualify the charge. The SHDN pin
must be above the logic high level, and the cell temper-
ature monitor must be within the upper and lower
threshold limits. The qualification parameters are con-
tinuously monitored. Deviation beyond the limits, auto-
matically suspends the charge cycle.
After the qualification parameters have been met, the
MCP73828 initiates a charge cycle. The charge com-
plete output, CD10, is pulled low throughout the pre-
conditioning and controlled current phases (see
Table 5-1 for charge complete outputs). If the cell volt-
age is below the preconditioning threshold, 2.4V typi-
cally, the MCP73828 preconditions the cell with a
scaled back current. The preconditioning current is set
to approximately 43% of the fast charge peak current.
The
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
2002 Microchip Technology Inc.
preconditioning
DEVICE OVERVIEW
Charge Qualification and
Preconditioning
Controlled Current Regulation - Fast
Charge
BAT
. Fast charge continues until the cell
SNS
safely
input developed by the drop
replenishes
SENSE
REG
, and the out-
.
deeply
4.3
When the cell voltage reaches the regulation voltage,
V
MCP73828 monitors the cell voltage at the V
This input is tied directly to the positive terminal of the
battery. The MCP73828 is offered in two fixed-voltage
versions for battery packs with either coke or graphite
anodes:
(MCP73828-4.2).
4.4
The charge cycle can be terminated by a host micro-
controller when the charge current has diminished
below approximately 10% of the peak output voltage
level. The charge complete output will go to a high
impedance state signaling when the charge can be ter-
minated. The charge is terminated by pulling the shut-
down pin, SHDN, to a logic Low level.
REG
, constant voltage regulation begins. The
Constant Voltage Regulation
Charge Cycle Completion
4.1V
(MCP73828-4.1)
MCP73828
DS21706A-page 9
and
OUT
4.2V
pin.