BQ24232HA Datasheet, PDF(13/36 Page) Texas Instruments – USB-Friendly Lithium-Ion Battery Charger

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BQ24232HA Datasheet, PDF (13/36 Pages) Texas Instruments – USB-Friendly Lithium-Ion Battery Charger

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bq24232HA

SLUSCG4 â MAY 2016

7.3 Feature Description

7.3.1 Undervoltage Lockout

The bq24232HA remains in power-down mode when the input voltage at the IN pin is below the undervoltage

lockout (UVLO) threshold.

During the power-down mode, the host commands at the control inputs (CE, EN1 and EN2) are ignored. The Q1

FET connected between IN and OUT pins is off, and the status outputs CHG and PGOOD are high impedance.

The Q2 FET that connects BAT to OUT is ON. During power-down mode, the VOUT(SC2) circuitry is active and

monitors for overload conditions on OUT.

7.3.2 Power On

When VIN exceeds the UVLO threshold, the bq24232HA powers up. While VIN is below VBAT + VIN(DT), the host

commands at the control inputs (CE, EN1, and EN2) are ignored. The Q1 FET connected between IN and OUT

pins is off, and the status outputs CHG and PGOOD are high impedance. The Q2 FET that connects BAT to

OUT is ON. During this mode, the VOUT(SC2) circuitry is active and monitors for overload conditions on OUT.

When VIN rises above VBAT + VIN(DT), PGOOD is low to indicate that the valid power status and the CE, EN1, and

EN2 inputs are read. The device enters standby mode whenever (EN1, EN2) = (1, 1) or if an input overvoltage

condition occurs. In standby mode, Q1 is OFF and Q2 is ON. During standby mode, the VOUT(SC2) circuitry is

active and monitors for overload conditions on OUT.

When the input voltage at IN is within the valid range: VIN > UVLO AND VIN > VBAT + VIN(DT) AND VIN < VOVP, and

the EN1 and EN2 pins indicate that the USB suspend mode is not enabled [(EN1, EN2) â (HI, HI)], all internal

timers and other circuit blocks are activated. The device checks for short circuits at the ISET and ILIM pins. If no

short conditions exists, the device switches on the input FET Q1 with a 100-mA current limit to check for a short

circuit at OUT. If VOUT rises above VSC, the FET Q1 switches to the current-limit threshold set by EN1, EN2, and

RILIM and the device enters normal operation where the system is powered by the input source (Q1 is on), and

the device continuously monitors the status of CE, EN1, and EN2 as well as the input voltage conditions.

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