MCP73831 Datasheet, PDF (9/24 Pages) Microchip Technology – Miniature Single-Cell, Fully Integrated Li-Ion, Li-Polymer Charge Management Controllers

MCP73831/2
3.0 PIN DESCRIPTION
The descriptions of the pins are listed in Table 3-1.
TABLE 3-1: PIN FUNCTION TABLES
Pin No.
DFN SOT23-5
Symbol
Function
1
4
2
—
3
3
4
—
5
1
6
2
7
—
8
5
V_DD
V_DD
V_BAT
V_BAT
STAT
V_SS
NC
PROG
Battery Management Input Supply
Battery Management Input Supply
Battery Charge Control Output
Battery Charge Control Output
Charge Status Output
Battery Management 0V Reference
No Connection
Current Regulation Set and Charge Control Enable
3.1 Battery Management Input Supply
(V_DD)
A supply voltage of [V_REG (typ.) + 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.
3.4 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.
3.3 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.
© 2006 Microchip Technology Inc.
DS21984B-page 9