Datasheet

bq24160, bq24160A

bq24161, bq24161B

bq24163, bq24168

www.ti.com

SLUSAO0E –NOVEMBER 2011–REVISED NOVEMBER 2013

DETAILED DESCRIPTION

The bq24160/bq24160A/bq24161/bq24161B/bq24163/bq24168 are highly integrated single cell Li-Ion battery

chargers and system power path management devices targeted for space-limited, portable applications with high

capacity batteries. The dual-input, single-cell charger operates from either a USB port or alternate power source

(i.e. wall adapter or wireless power input) for a versatile solution.

The power path management feature allows the bq2416x to power the system from a high efficiency DC-to-DC

converter while simultaneously and independently charging the battery. The charger monitors the battery current

at all times and reduces the charge current when the system load requires current above the input current limit.

This allows proper charge termination and enables the system to run with a defective or absent battery pack.

Additionally, this enables instant system turn-on even with a totally discharged battery or no battery. The power-

path management architecture also permits the battery to supplement the system current requirements when the

adapter cannot deliver the peak system currents. This enables the use of a smaller adapter. The 2.5 A current

capability allows for GSM phone calls as soon as the adapter is plugged in regardless of the battery voltage. The

charge parameters are programmable using the I

C interface.

CHARGE MODE OPERATION

Charge Profile

The internal battery MOSFET is used to charge the battery. When the battery is above the MINSYS votlage, the

the internal FET is on to maximize efficiency and the PWM converter regulates the charge current into the

battery. When battery is less than MINSYS, the SYS is regulated to V

SYS(REG)

and battery is charged using the

battery FET to regulate the charge current. There are 5 loops that influence the charge current:

• Constant current loop (CC)

• Constant voltage loop (CV)

• Thermal-regulation loop

• Minimum system-voltage loop (MINSYS)

• Input-voltage dynamic power-management loop (V

-DPM)

During the charging process, all five loops are enabled and the one that is dominant takes control. The bq2416x

supports a precision Li-Ion or Li-Polymer charging system for single-cell applications. The Dynamic Power Path

Management (DPPM) feature regulates the system voltage to a minimum of V

MINSYS

, so that startup is enabled

even for a missing or deeply discharged battery. Figure 22 shows a typical charge profile including the minimum

system output voltage feature.

Product Folder Links: bq24160 bq24160A bq24161 bq24161B bq24163 bq24168