MCP73832T-2ACI/OT Microchip Technology Inc., MCP73832T-2ACI/OT Datasheet - Page 12

• Manufacturer Part Number: MCP73832T-2ACI/OT
• Description: TINY INTEGRATED LI-ION/LI-POLY CHARGE MGNT CONTROLLER, 4.2V VREG
• Manufacturer: Microchip Technology Inc.

Specifications of MCP73832T-2ACI/OT

• Lead Free Status / Rohs Status: RoHS Compliant part Electrostatic Device

MCP73831/2
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 plac-
ing a programming resistor (R
input to V
current 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.
DS21984B-page 12
Where:
R
PROG
I
REG
DD
DETAILED DESCRIPTION
Analog Circuitry
input is the input supply to the MCP73831/2.
SS
BATTERY MANAGEMENT INPUT
SUPPLY (V
CURRENT REGULATION SET
(PROG)
BATTERY CHARGE CONTROL
OUTPUT (V
. The program resistor and the charge
=
=
STOP
I
kOhms
milliampere
REG
). This feature prevents draining
DD
=
BAT
)
---------------- -
R
DD
1000V
)
PROG
DD
PROG
supply is not present.
input falls below the
) from the PROG
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 differ-
ent 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 summarize the state of the status output
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 A, typically.
Shutdown
No Battery Present
Preconditioning
Constant-Current Fast
Charge
Constant Voltage
Charge Complete –
Standby
Charge Cycle State
SS
enables the device. Allowing the PROG input to
Digital Circuitry
STATUS INDICATOR (STAT)
DEVICE DISABLE (PROG)
STATUS OUTPUT
© 2006 Microchip Technology Inc.
MCP73831 MCP73832
Hi-Z
Hi-Z
H
L
L
L
STAT1
Hi-Z
Hi-Z
Hi-Z
L
L
L