BQ24153A_14 Datasheet, PDF (16/46 Pages) Texas Instruments – Fully Integrated Switch-Mode One-Cell Li-Ion Charger With Full USB Compliance and USB-OTG Support

bq24153A, bq24156A
bq24158, bq24159
SLUSAB0C – OCTOBER 2010 – REVISED JULY 2013
www.ti.com
DETAILED FUNCTIONAL DESCRIPTION
For a current restricted power source, such as a USB host or hub, a high efficiency converter is critical to fully
use the input power capacity for quickly charging the battery. Due to the high efficiency for a wide range of input
voltages and battery voltages, the switch mode charger is a good choice for high speed charging with less power
loss and better thermal management than a linear charger.
The bq24153A/8/9 are highly integrated synchronous switch-mode chargers, featuring integrated FETs and small
external components, targeted at extremely space-limited portable applications powered by 1-cell Li-Ion or Li-
polymer battery pack. Furthermore, bq24153A/8 also has bi-directional operation to achieve boost function for
USB OTG support.
The bq24153A/8 have three operation modes: charge mode, boost mode, and high impedance mode, while the
bq24156A/9 only has charge mode and high impedance mode. In charge mode, the IC supports a precision Li-
ion or Li-polymer charging system for single-cell applications. In boost mode, the IC boosts the battery voltage to
VBUS for powering attached OTG devices. In high impedance mode, the IC stops charging or boosting and
operates in a mode with very low current from VBUS or battery, to effectively reduce the power consumption
when the portable device is in standby mode. Through I²C communication with a host, referred to as "HOST or
32-second" control/mode, the IC achieves smooth transition among the different operation modes. Even when no
I²C communication is available, the IC starts a 15 minute saftey timer and enters "15-minute" (default) mode.
During 15-minute operation, the charger will still charge the battery but using each register's default values.
Input Voltage Protection
Input Overvoltage Protection
The IC provides a built-in input overvoltage protection to protect the device and other components against
damage if the input voltage (Voltage from VBUS to PGND) goes too high. When an input overvoltage condition is
detected, the IC turns off the PWM converter, sets fault status bits, and sends out a fault pulse from the STAT
pin. Once V_BUS drops below the input overvoltage exit threshold, the fault is cleared and charge process
resumes.
Bad Adaptor Detection/Rejection
Although not shown in Figure 26, at power-on-reset (POR) of VBUS, the IC performs the bad adaptor detection
by applying a current sink to VBUS. If the VBUS is higher than V_IN(MIN) for 30ms, the adaptor is good and the
charge process begins. Otherwise, if the VBUS drops below V_IN(MIN), a bad adaptor is detected. Then, the IC
disables the current sink, sends a send fault pulse in FAULT pin and sets the bad adaptor flag (B2 - B0 = 011 for
Register 00H). After a delay of T_INT, the IC repeats the adaptor detection process, as shown in Figure 27 and
Figure 28.
Adpator
VBUS
VBUS
I_SHORT
(30 mA)
Adaptor Detection Control
GND
PGND
V_IN
V_IN(MIN)
V_{IN_GOOD}
Deglitch
30ms
V_{IN_POOR}
START
Delay
T_INT
Figure 27. Bad Adaptor Detection Circuit
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