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RT9502 Dataheets PDF



Part Number RT9502
Manufacturers Richtek Technology
Logo Richtek Technology
Description Linear Single Cell Li-Ion Battery Charger IC
Datasheet RT9502 DatasheetRT9502 Datasheet (PDF)

RT9502 Linear Single Cell Li-Ion Battery Charger IC with Dual Input Supply General Description The RT9502 is a fully integrated low cost single-cell LiIon battery charger IC ideal for portable applications. The RT9502 is capable of being powered up from AC adapter and USB (Universal Serial Bus) port inputs. The RT9502 can automatically detect and select the AC adapter and the USB port as the power source for the charger. The RT9502 enters sleep mode when both supplies are removed. The RT9502 o.

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RT9502 Linear Single Cell Li-Ion Battery Charger IC with Dual Input Supply General Description The RT9502 is a fully integrated low cost single-cell LiIon battery charger IC ideal for portable applications. The RT9502 is capable of being powered up from AC adapter and USB (Universal Serial Bus) port inputs. The RT9502 can automatically detect and select the AC adapter and the USB port as the power source for the charger. The RT9502 enters sleep mode when both supplies are removed. The RT9502 optimizes the charging task by using a control algorithm including precondition mode, fast charge mode and constant voltage mode. The charging task is terminated as the charge current drops below the preset threshold. The USB charge current can be selected from preset ratings of 100mA and 500mA, while the AC adapter charge current can be programmed up to 1A with an external resister. The internal thermal feedback circuitry regulates the die temperature to optimize the charge rate for all ambient temperatures. The RT9502 features 18V and 7V maximum rating voltages for AC adapter and USB port inputs respectively. The other features are under voltage protection, over voltage protection for AC adapter supply and battery temperature monitoring. Features z Automatic Input Supplies Selection z 18V Maximum Rating for AC Adapter z Integrated Selectable 100mA and 500mA USB Charge Current z Internal Integrated P-MOSFETs z AC Adapter Power Good Status Indicator z Charge Status Indicator z Under Voltage Protection z Over Voltage Protection z Automatic Recharge Feature z Battery Temperature Monitoring z Small 10-Lead WDFN Package z Thermal Feedback Optimizing Charge Rate z RoHS Compliant and 100% Lead (Pb)-Free Applications z Digital Cameras z Cellular Phones z Personal Digital Assistants (PDAs) z MP3 Players z Hand Held PCs Pin Configurations Ordering Information RT9502 Package Type QW : WDFN-10L 3x3 (W-Type) Lead Plating System P : Pb Free G : Green (Halogen Free and Pb Free) (TOP VIEW) ACIN 1 USB 2 CHG_S 3 PGOOD 4 GND 5 GND 11 9 10 BATT 9 TS 8 EN 7 ISETU ISETA WDFN-10L 3x3 Note : Richtek products are : ` RoHS compliant and compatible with the current requirements of IPC/JEDEC J-STD-020. ` Suitable for use in SnPb or Pb-free soldering processes. Marking Information For marking information, contact our sales representative directly or through a Richtek distributor located in your area. DS9502-02 April 2011 www.richtek.com 1 RT9502 Typical Application Circuit AC Adapter RT9502 1 ACIN 10 BATT 1uF + Battery Pack USB 2 USB 1uF To System To System 3 CHG_S 4 PGOOD 5, Exposed Pad(11) GND 9 TS 8 EN 7 ISETU ISETA 6 Chip Shutdown Chip Enable H : 500mA L : 100mA RSET 0.1uF to 10uF Pre-Charge Phase Fast Charge Phase Programmed Charge Current Constant Voltage Phase & Re-Charge Phase Standby Phase 4.1V Recharge Threshold Battery Voltage Charging Current 1/10 Programmed Charge Current 2.8V Precharge Threshold Charge Complete Functional Pin Description Pin No. Pin Name Pin Function 1 ACIN 2 USB 3 CHG_S 4 PGOOD 5 GND 6 ISETA 7 ISETU 8 EN 9 TS 10 BATT 11 (Exposed Pad) GND AC Adaptor Charge Input Supply. USB Charge Input Supply. Charge Status Indicator Output (open drain). Power Good Indicator Output (open drain). Ground. Wall Adaptor Supply Charge Current Set Point. USB Supply Charge Current Set Input (active low). Charge Enable Input (active low). Temperature Sense Input. Battery Charge Current Output. The exposed pad must be soldered to a large PCB and connected to GND for maximum power dissipation. www.richtek.com 2 DS9502-02 April 2011 Function Block Diagram USB SENSE MOSFET USB P-MOSFET RT9502 Charge Input Selection ACIN 2.5V OVP Comparator + OVP - SENSE MOSFET ACIN P-MOSFET ISETA GND 1.5k 7.5k 1uA 2.5V 0.5V 0.25V Precharge VREF ACIN/USB Thermal Sense 115 C VFB DRV VCC/USB Loop Controller Termination Comparator - 0.25V 0.9V + - Charge Disable + 1uA VREF Thermal Sense Logic Temperature Fault Temperature Sense BATT PGOOD CHG_S ISETU EN TS DS9502-02 April 2011 www.richtek.com 3 SLEEP UVP / OVP DISABLE RT9502 RT9502 Flow Chart Start-Up ACIN/USB Power Up VEN > 1.4V ? NO VACIN > 6.5V or (VACIN < 4.4V and VUSB < 4.4V) ? NO VACIN < VBATT and VUSB < VBATT ? NO 1ms Delay Table Precharge Phase Fast Charge Phase Standby/Fault Recharge Phase YES YES YES DISABLE MODE P-MOSFET OFF IBATT=0 OVP/UVP MODE P-MOSFET OFF IBATT=0 SLEEP MODE P-MOSFET OFF IBATT=0 Start-Up VTS > 2.5V or VTS < 0.5V? NO VBATT > 2.8V? NO YES YES IBATT = 0.1 Charge Current /CHG_S Pull Down TEMP FAULT/CHG_S HIGH IMPEDANCE IBATT = Charge Current /CHG_S Pull Down YES NO VBATT ~ 4.2V, IBATT < 0.1 ICHG? YES STANDBY PFET OFF VBATT = 4.2V, IBATT = 0 RECHARGE YES VBATT > 4.1 V? NO www.richtek.com 4 DS9502-02 April 2011 RT9502 Absolute Maximum Ratings (Note 1) z ACIN Input Voltage -------------------------------------------------------------------------------------------------------- −0.3V to 18.


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