BQ24401_15 Datasheet, PDF (2/27 Pages) Texas Instruments – Programmable NiCd/NiMH Fast-Charge Management IC

bq24401
SLUS497A – SEPTEMBER 2001 – REVISED MARCH 2010
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These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam
during storage or handling to prevent electrostatic damage to the MOS gates.
PIN DESCRIPTIONS
SNS
V_SS
LED
BAT
TS
RC
V_CC
MOD
Current-sense input
Enables the bq24401 to sense the battery current via the voltage developed on this pin by an
external sense-resistor connected in series with the battery pack
System Ground
Connect to the battery’s negative terminal
Charge-status output
Open-drain output that indicates the charging status by turning on, turning off, or flashing an external
LED, driven through a resistor.
Battery-voltage input
Battery-voltage sense input. A simple resistive divider, across the battery terminals, generates this
input.
Temperature-sense input
Input for an external battery-temperature monitoring circuit. An external resistive divider network with
a negative temperature-coefficient thermistor sets the lower and upper temperature thresholds.
Timer-program input
Used to program the maximum fast charge-time, maximum top-off charge-time, hold-off period, trickle
charge rate, and to disable or enable top-off charge. A capacitor from V_CC and a resistor to ground
connect to this pin.
Supply-voltage input
Recommended bypassing is 10µF + 0.1µF to 0.22µF of decoupling capacitance near the pin.
Modulation-control output
Push-pull output that controls the charging current to the battery. MOD switches high to enable
charging current to flow and low to inhibit charging-current flow.
2
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