MCP73831T-2ATI/OT Microchip Technology, MCP73831T-2ATI/OT Datasheet - Page 15

• Manufacturer Part Number: MCP73831T-2ATI/OT
• Description: IC CONTROLLR LI-ION 4.2V SOT23-5
• Manufacturer: Microchip Technology

Specifications of MCP73831T-2ATI/OT

• Battery Type: Lithium-Ion (Li-Ion), Lithium-Polymer (Li-Pol)
• Function: Charge Management
• Voltage - Supply: 3.75 V ~ 6 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: SC-74A, SOT-753
• Input Voltage: 6V
• Battery Charge Voltage: 4.2V
• Charge Current Max: 500mA
• Battery Ic Case Style: SOT-23
• No. Of Pins: 5
• No. Of Series Cells: 1
• Output Voltage: 4.2 V
• Operating Supply Voltage: 3.75 V to 6 V
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Contains lead / RoHS non-compliant
• Other names: MCP73831T-2ATI/OT; MCP73831T-2ATI/OTTR

5.0
5.1
5.1.1
The V
The MCP73831/2 automatically enter a Power-Down
mode if the voltage on the V
UVLO voltage (V
the battery pack when the V
5.1.2
Fast charge current regulation can be scaled by placing
a programming resistor (R
to V
are calculated using the following equation:
The preconditioning trickle charge current and the
charge termination current are ratiometric to the fast
charge current based on the selected device options.
5.1.3
The battery charge control output is the drain terminal
of an internal P-channel MOSFET. The MCP73831/2
provide constant current and voltage regulation to the
battery pack by controlling this MOSFET in the linear
region. The battery charge control output should be
connected to the positive terminal of the battery pack.
© 2008 Microchip Technology Inc.
Where:
R
PROG
SS
I
REG
DD
. The program resistor and the charge current
DETAILED DESCRIPTION
Analog Circuitry
input is the input supply to the MCP73831/2.
BATTERY MANAGEMENT INPUT
SUPPLY (V
CURRENT REGULATION SET
(PROG)
BATTERY CHARGE CONTROL
OUTPUT (V
=
=
STOP
I
kOhms
milliampere
REG
). This feature prevents draining
DD
=
BAT
PROG
)
---------------- -
R
DD
1000V
)
PROG
DD
supply is not present.
) from the PROG input
input falls below the
5.2
5.2.1
The charge status output of the MCP73831 has three
different states: High (H), Low (L), and High-Imped-
ance (Hi-Z). The charge status output of the
MCP73832 is open-drain, and, as such, has two
different states: Low (L), and High-Impedance (Hi-Z).
The charge charge status output can be used to
illuminate 1, 2, or tri-color LEDs. Optionally, the charge
status output can be used as an interface to a host
microcontroller.
Table 5-1
during a charge cycle..
TABLE 5-1:
5.2.2
The current regulation set input pin (PROG) can be
used to terminate a charge at any time during the
charge cycle, as well as to initiate a charge cycle or
initiate a recharge cycle.
Placing a programming resistor from the PROG input to
V
float or by applying a logic-high input signal, disables
the device and terminates a charge cycle. When
disabled, the device’s supply current is reduced to
25 µA, typically.
Shutdown
No Battery Present
Preconditioning
Constant-Current Fast
Charge
Constant Voltage
Charge Complete –
Standby
SS
Charge Cycle State
enables the device. Allowing the PROG input to
Digital Circuitry
summarize the state of the status output
STATUS INDICATOR (STAT)
DEVICE DISABLE (PROG)
STATUS OUTPUT
MCP73831/2
MCP73831 MCP73832
Hi-Z
Hi-Z
H
L
L
L
DS21984E-page 15
STAT1
Hi-Z
Hi-Z
Hi-Z
L
L
L