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Programmable Charge Current Up to 800mA No MOSFET, Sense Resistor or Blocking Diode Rquired Complete Linear Charger in SOT-23-5 Package for Single Cell Lithium-Ion Baeries Constant-Current/Constant-Voltage Charges Single Cell Li-Ion Baeries Directly from USB Port Preset 4.2V Charge Voltage with 1.5% Accuracy Automac Recharge Charge Status Output Pins C/10 Charge Terminaon 2.9V Trickle Charge Threshold So-Start Limits Inrush Current Available Radiator in SOT23-5 Package, the Radiator need connect GND or impending Applicaons Cellular Telephones, PDAs, GPS Charging Docks and Cradles Digital Sll Cameras, Portable Devices USB Bus-Powered Chargers, Chargers Package Types Figure 1. Package Types of FC9054
Pin Configuraons Figure 2 Pin Configuraon of FC9054(Top View) Pin Descripon Pin Name Pin Number CHRG 1 When the baery is being charged, the CHRG pin is pulled low by an internal switch, otherwise CHRG pin is in high impedance state. GND 2 GND BAT 3 Connect the posi ve terminal of the ba ery to BAT pin. BAT pin draws l ess than 2uA current in chip disable mode or in sleep mode. BAT pin provides charge current to the baery and provides regulaon voltage of 4.2V. Vcc 4 VIN is the power supply to the internal circuit. When VIN drops to within 30mv of the BAT pin v oltage, FC9054 enters low power sleep mode, dropping BAT pin’s current to less than 2uA PROG 5 charge current is set by co nnecng a resistor R PROG from this pin to GND. When in precharge mode, the PROG pin’s voltage is regulated to 0.1V. When in constant charge current mode, the PROG pin’s v oltage is regulated to 1V. In all modes during charging, the voltage on PROG pin can be used to measure the charge current as follows: IBAT=(VPROG/RPROG)*1000----(FC9054) Ordering Informaon FC9054 Circuit Type Packing: Blank ：Tube R: Tape and Reel T : SOT-23-5 CHRG 1 GND 2 BAT 3
5 PROG
4 VCC
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145°C Tdie 80%Vin 45%Vin VCC BAT 5uA REF 1.22V SHDN R3 0.1V 2.9V TO BAT 3uA VCC PROG GND 5 2 1000x FC9054 2019. 05. 13 3/8Revision No : 0
(VIN = 5V, TA = 25°C unless otherwise specified) Parameters Symbol Test Condion Min. Typ. Max. Unit Input Supply Voltage VCC 4.0 5 8.0 V Input Supply Current Icc Charge Mode, R PROG =2k Shutdown Mode (RPROG Not Connected, VCC < VBAT, or VCC< VUV) 150 500 100 µA Regulated Output (Float) Voltage VFLOAL 0℃≤TA≤85℃，IBAT=40mA 4.137 4.2 4.26 V BAT Pin Current IBAT RPROG = 2k, Current Mode RPROG = 3k, Current Mode Standby Mode, VBAT = 4.2V 450 300 500 350 -2.5 550 400 -2.6 mA mA uA Trickle Charge Current ITRIKL V BAT<VTRIKL, RPROG=2K 60 65 70 mA Trickle Charge Threshold Voltage V TRIKL R PROG=2K, VBAT Rising 2.8 2.9 3.0 V Trickle Charge Hysteresis Voltage V TRHYS RPROG=2K 60 80 100 mv Undervoltage Vuv Vcc increasing 3.5 3.7 3.9 V PROG pin voltage Vprog RPROG = 2k, Current Mode 0.9 1 1.1 V CHRG pin voltage VCHRG ICHRG=5mA 0.3 0.6 V Junction Temperature in Constant Temperature Mode TL M 145 ℃ FC9054 2019. 05. 13 4/8Revision No : 0
Vin=5V 0.4 10uF Vcc CHRG GND PROG Bat+ RPROG Li-ion10uF Bat- BAT FC9054 FC9054 2019. 05. 13 5/8Revision No : 0
The FC9054 is a linear charger circuit specially designed for single cell lithium- ion ba eries. When the FC9054 is powered with a baery connected, the IC first detects if the cell voltage is ready for full charge current. If the cell voltage is less than the prequal level (3V ty p), the ba ery is precharged with a 55mA current un l the cell reaches the proper level. The full charging current, as set by PROG pin, is then applied Soft-Start The FC9054 includes a soft-start function to control the rise rate of the charging current rising from zero to t he f ast-charging current level in constant current mode. During charger soft-start, the FC9054 ra mps up t he vo ltage on PR OG pin with c onstant well-controlled slew rate. The charging current is proportional to the PROG voltage. The soft-start time is 20us (typical), which is independent of the fast-charging current level. Charging Current Setting The charge current is programmed by using a resistor from the PROG pin to the gr ound. The ba ery charge current is 1000 mes the current out of the PROG pin. The ba ery charge current is calculated by the following equaon: ICHG=VPROG*1000/RPROG Where VPROG is PROG regula on vol tage (nominal=1V). The charging current set factor and the PROG regula on voltage are shown in the Electrical Characteris cs. The PROG regulaon voltage is reduced by thermal regulaon funcon. Battery Full Indication Current mo de charging stopped wh en I bat f alls to 10% of t he current set by R PROG and the charger is in voltage mode. After the FC9054 stopped current mode charging, it keeps operating in voltage mode without turning off the charger. When the PROG pin's voltage down to 100mv over 2ms, the charger will stop operating and the Vcc current down to 55uA. Charge Status Outputs The open-drain CHR G outputs can be used to drive LED indicate four charger operations are shown in Table 1. Charge state Red LED（CHRG） charging bright Charge Termination extinguish Vin too low; Temperature of battery too low or too high; no battery extinguish BAT PIN Connect 10u Capacitance; No battery Extinguish (T=1-4s) Table 1. Increase the heat regulating current Reduce the v oltage drop across the internal MOSFET can significantly reduce the power consumpon of the IC. During thermal regula on, this has an increased current supplied to the ba ery. One strategy is accomplished by an external element (e.g., a resistor or a diode) will be part of the power consumpon. Example: FC9054 is powered by a 5V AC adapter, it charge to one with a 3. 75V v oltage lithium- ion b aery, and set the full-scale charge current 800mA by programming. Assuming θJA is 125 ℃/W, at 25 ℃ ambient temperature condions , the charging current is approximately: IBAT Increase the v oltage across the resi stor in series with a 5V AC adapter(Figure 3), the on-chip power dissipaon can be reduced, thereby increasing the heat regulang current: IBAT S BAT RCC BAT JA mA FC9054 2019. 05. 13 6/8Revision No : 0
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