BQ24230H_14 Datasheet, PDF(17/38 Page) Texas Instruments – USB-Friendly Lithium-Ion Battery Charger and Power-Path Management IC

English

English German Russian Spanish Italian Polish Chinese Japanese Korean French Portuguese	Language :

BQ24230H_14 Datasheet, PDF (17/38 Pages) Texas Instruments – USB-Friendly Lithium-Ion Battery Charger and Power-Path Management IC

◁

www.ti.com

PRECHARGE

CC FAST CHARGE

CV TAPER

VBAT(REG)

IO(CHG)

Battery Current

bq24230H

bq24232H

SLUSBI8 â JANUARY 2014

DONE

VLOWV

I(PRECHG)

I(TERM)

Battery Voltage

CHG = Hi-z

Figure 21.

In the precharge phase, the battery is charged with the precharge current (IPRECHG). Once the battery voltage

crosses the VLOWV threshold, the battery is charged with the fast-charge current (ICHG). As the battery voltage

reaches VBAT(REG), the battery is held at a constant voltage of VBAT(REG) and the charge current tapers off as the

battery approaches full charge. When the battery current reaches ITERM, the CHG pin indicates charging done by

going high impedance.

IPRECHG = KPRECHG/RISET

(1)

Termination detection is disabled whenever the charge rate is reduced because of the actions of the thermal

loop, the DPPM loop, or the VIN(LOW) loop.

The value of the fast-charge current is set by the resistor connected from the ISET pin to VSS, and is given by

Equation 2:

ICHG = KISET/RISET

(2)

The charge current limit is adjustable from 25 mA to 500 mA. The valid resistor range is 1.74 kâ¦ to 34.8 kâ¦.

Note that if ICHG is programmed as greater than the input current limit, the battery does not charge at the rate of

ICHG, but at the slower rate of IIN(MAX) (minus the load current on the OUT pin, if any). In this case, the charger

timers are proportionately slowed down.

Product Folder Links: bq24230H bq24232H

Submit Documentation Feedback

▷