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MCP73831T-2ATI/OTDatasheet PDF
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© 2008 Microchip Technology Inc. DS21984E-page 11
MCP73831/2
3.0 PIN DESCRIPTION
The descriptions of the pins are listed in Table 3-1.
TABLE 3-1: PIN FUNCTION TABLES
3.1 Battery Management Input Supply
(V
DD
)
A supply voltage of [V
REG
(typical) + 0.3V] to 6V is
recommended. Bypass to V
SS
with a minimum of
4.7 µF.
3.2 Battery Charge Control Output
(V
BAT
)
Connect to positive terminal of battery. Drain terminal
of internal P-channel MOSFET pass transistor. Bypass
to V
SS
with a minimum of 4.7 µF to ensure loop stability
when the battery is disconnected.
3.3 Charge Status Output (STAT)
STAT is an output for connection to an LED for charge
status indication. Alternatively, a pull-up resistor can be
applied for interfacing to a host microcontroller.
STAT is a tri-state logic output on the MCP73831 and
an open-drain output on the MCP73832.
3.4 Battery Management 0V Reference
(V
SS
)
Connect to negative terminal of battery and input
supply.
3.5 Current Regulation Set (PROG)
Preconditioning, fast charge and termination currents
are scaled by placing a resistor from PROG to V
SS
.
The charge management controller can be disabled by
allowing the PROG input to float.
3.6 Exposed Thermal Pad (EP)
There is an internal electrical connection between the
Exposed Thermal Pad (EP) and the V
SS
pin; they must
be connected to the same potential on the Printed
Circuit Board (PCB).
Vias are recommended to add from land area of EP to
a copper layer on the other side of the PCB for better
thermal performance.
Pin No.
Symbol Function
DFN SOT-23-5
14 V
DD
Battery Management Input Supply
2— V
DD
Battery Management Input Supply
33 V
BAT
Battery Charge Control Output
4— V
BAT
Battery Charge Control Output
5 1 STAT Charge Status Output
62 V
SS
Battery Management 0V Reference
7 — NC No Connection
8 5 PROG Current Regulation Set and Charge Control Enable
9— EP
Exposed Thermal Pad (EP); must be connected to V
SS
.
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