MCP73833 Microchip Technology, Inc., MCP73833 Datasheet - Page 9

• Manufacturer Part Number: MCP73833
• Description: 1A output current linear charge management controller. Includes integrated pass transistor, integrated current sensing, and reverse discharge protection. Also includes safety features such as cell temperature monitoring, on-chip thermal regulation an
• Manufacturer: Microchip Technology, Inc.

3.0
Descriptions of the pins are listed in
TABLE 3-1:
3.1
A supply voltage of [V
recommended. Bypass to V
3.2
STAT1 and STAT2 are open-drain logic outputs for con-
nection to a LED for charge status indication.
Alternatively, a pull-up resistor can be applied for
interfacing to a host microcontroller.
3.3
Connect to negative terminal of battery and input
supply.
3.4
Preconditioning, fast charge, and termination currents
are scaled by placing a resistor from PROG to V
The charge management controller can be disabled by
allowing the PROG input to float.
3.5
The power good (PG) option is a pseudo open-drain
output. The PG output can sink current, but not source
current. However, there is a diode path back to the
input, and, as such, the PG output should only be
pulled up to the input. The PG output is low whenever
the input to the MCP73833 is above the UVLO
threshold and greater than the battery voltage.
© 2006 Microchip Technology Inc.
DFN
10
1
2
3
4
5
6
7
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Pin No.
PIN DESCRIPTIONS
Battery Management Input Supply
(V
Charge Status Outputs (STAT1,
STAT2)
Battery Management 0V Reference
(V
Current Regulation Set (PROG)
Power Good Indication (PG)
MCP73833 Only
DD
SS
MSOP
)
)
10
1
2
3
4
5
6
7
8
9
PIN FUNCTION TABLE
REG
(typ.) + 0.3V] to 6V is
Symbol
THERM
PG, TE
SS
STAT1
STAT2
PROG
V
V
V
V
V
BAT
BAT
DD
DD
SS
with a minimum of 1 µF.
Table
Battery Management Input Supply
Battery Management Input Supply
Charge Status Output
Charge Status Output
Battery Management 0V Reference
Current Regulation Set and Charge Control Enable
MCP73833: Power Good output, MCP73834: Timer Enable input
Thermistor input
Battery Charge Control Output
Battery Charge Control Output
3-1.
SS
.
3.6
The timer enable (TE) input option is used to enable or
disable the internal timer. A low signal on this pin
enables the internal timer and a high signal disables
the internal timer. The TE input can be used to disable
the timer when the charger is supplying current to
charge the battery and power the system load. The TE
input is compatible with 1.8V logic.
3.7
An internal 50 µA current source provides the bias for
most common 10 kΩ negative-temperature coefficient
thermistors (NTC). The MCP73833/4 compares the
voltage at the THERM pin to factory set thersholds of
1.20V and 0.25V, typically.
3.8
Connect to positive terminal of battery. Drain terminal
of internal P-channel MOSFET pass transistor. Bypass
to V
when the battery is disconnected.
SS
with a minimum of 1 µF to ensure loop stability
Timer Enable Input (TE)
MCP73834 Only
Thermistor Input (THERM)
Battery Charge Control Output
(V
Function
BAT
)
MCP73833/4
DS22005A-page 9