bq2054
Lithium Ion Fast-Charge IC
Features General Description вћ¤ Safe charge of Lithium Ion battery packs The bq2054 Lithium Ion FastCharge IC is designed to optimize
charging of lithium ion (Li-Ion)
chemistry batteries. A flexible
pulse-width modulation regulator
allows the bq2054 to control voltage
and current during charging. The
regulator frequency is set by an external capacitor for design flexibility.
The switch-mode design keeps
power dissipation to a minimum. вћ¤ Voltage-regulated currentlimited charging
вћ¤ Fast charge terminated by selectable minimum current; safety
backup termination on maximum
time
вћ¤ Charging continuously qualified
by temperature and voltage limits
вћ¤ Pulse-width modulation control
ideal for high-efficiency switchmode power conversion The bq2054 measures battery temperature using an external thermistor for charge qualification. Charging
begins when power is applied or on
battery insertion. вћ¤ Direct LED control outputs display charge status and fault conditions For safety, the bq2054 inhibits
charging until the battery voltage
and temperature are within con-Pin Connections Pin Names TM 1 16 LED2/DSEL ICTL 2 15 LED1 BAT 3 14 MOD VCOMP 4 13 VCC ICOMP 5 12 VSS ITERM 6 11 LCOM SNS 7 10 LED3 TS 8 9 TPWM 16-Pin Narrow
DIP or SOIC figured limits. If the battery voltage …
