BQ24232H_15 Datasheet, PDF (16/42 Pages) Texas Instruments – bq2423xx USB-Friendly Lithium-Ion Battery Charger and Power-Path Management IC

bq24230H, bq24232H
SLUSBI8A – JANUARY 2014 – REVISED DECEMBER 2014
www.ti.com
9.3.3.1.2 DPPM Mode
When the sum of the charging and system load currents exceeds the preset maximum input current
(programmed with EN1, EN2, and ILIM pins), the voltage at OUT decreases. Once the voltage on the OUT pin
falls to V_DPPM, the bq2423xH enters DPPM mode. In this mode, the charging current is reduced as the OUT
current goes up in order to maintain the system output. Battery termination is disabled while in DPPM mode.
9.3.3.1.3 Battery Supplement Mode
While in DPPM mode, if the charging current falls to zero and the system load current increases beyond the
programmed input current limit, the voltage at OUT reduces further. When the OUT voltage drops below the
battery voltage by V_BSUP1, the battery supplements the system load. The battery stops supplementing the system
load when the voltage on the OUT pin rises above the battery voltage by V_BSUP2.
During supplement mode, the battery supplement current is not regulated; however, a short-circuit protection
circuit is built in. If during battery supplement mode, the voltage at OUT drops 250 mV below the BAT voltage,
the OUT output is turned off if the overload exists after t_DGL(SC2). The short-circuit recovery timer then starts
counting. After t_REC(SC2), OUT turns on and attempts to restart. If the short circuit remains, OUT is turned off and
the counter restarts. Battery termination is disabled while in supplement mode.
500 mA
400 mA
250 mA
0 mA
400 mA
150 mA
0 mA
150 mA
0 mA
-100 mA
4 .4 V
4 .3 V
~ 3.6V
DPM loop active
Supplement
Mode
Figure 13. bq2423xH DPPM and Battery Supplement Modes
(V_OREG = 4.4 V, V_BAT = 3.6 V, I_LIM = 400 mA, I_CHG = 150 mA)
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