bq24030-Q1

bq24031-Q1

This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with

appropriate precautions. Failure to observe proper handling and installation procedures can cause damage.

ESD damage can range from subtle performance degradation to complete device failure. Precision integrated circuits may be more

susceptible to damage because very small parametric changes could cause the device not to meet its published specifications.

DESCRIPTION (CONTINUED)

The power select pin (PSEL) defines which input source is to be used first (primary source is either AC or USB).

If the primary source is not available, then the IC automatically switches over to the secondary source (if

available) or the battery as the last option. If the PSEL is set low, the USB input is selected first and (if not

available) the AC line is selected (if available) but programmed to a USB input limiting rate (100 mA/500 mA

max). This feature allows the use of one input connector, where the host programs the PSEL pin according to

what source is connected (AC adapter or USB port).

The ISET1 pin programs the battery's fast-charge constant current level with a resistor. During normal AC

operation, the input supply provides power to both the OUT (system) and BAT pins. For peak or excessive loads

(typically when operating from the USB power, PSEL = low) that would cause the input source to enter current

limit (or Q3 – USB FET limiting current) and its source and system voltage (OUT pin) to drop, the dynamic

power-path management (DPPM) feature reduces the charging current attempting to prevent any further drop in

system voltage. This feature allows the selection of a lower current rated adapter based on the average load

OUT PIN FOR AC

BATTERY

ORDERABLE

TOP-SIDE

INPUT CONDITIONS

VOLTAGE (V)

PART NUMBER

MARKING

(3)

4.2

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BQ24030

–40°C to 85°C

QFN – RHL

Reel of 3000

4.1

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BQ24031

(1)

For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TI

web site at www.ti.com.

(2)

This product is RoHS compatible, including a lead concentration that does not exceed 0.1% of total product weight, and is suitable for

use in specified lead-free soldering processes. In addition, this product uses package materials that do not contain halogens, including

bromine (Br) or antimony (Sb) above 0.1% of total product weight.

(3)

When power is applied via the USB pin (PSEL = low), the input voltage is switched straight through to the OUT pin, unless the USB

input current limit is active, and then the OUT pin voltage typically drops to the DPPM-OUT threshold or battery voltage (whichever is

higher).

(4)

Package drawings, thermal data, and symbolization are available at www.ti.com/packaging.

(5)

2

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