BQ24030-Q1 Datasheet, PDF (24/34 Pages) Texas Instruments – SINGLE-CHIP CHARGE AND SYSTEM POWER-PATH MANAGEMENT IC

bq24030-Q1
bq24031-Q1
SLUS793B – APRIL 2008 – REVISED OCTOBER 2009.................................................................................................................................................... www.ti.com
This short-circuit disable feature was implemented mainly for power up when inserting a battery. Because the
BAT input voltage rises much faster than the OUT voltage (V_OUT < V_BAT – 200 mV), with most any capacitive load
on the output, the part can get stuck in short-circuit mode. Placing a capacitor between the DPPM pin and
ground slows the V_DPPM rise time during power up, and delays the short-circuit protection. Too large a
capacitance on this pin (too much of a delay) could allow too-high currents if the output were shorted to ground.
The recommended capacitance is 1 nF to 10 nF. The V_DPPM rise time is a function of the 100-µA DPPM current
source, the DPPM resistor, and the capacitor added.
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