DATASHEET ISL9220, ISL9220A FN6936 Rev 3.00 Switching Charger for 1-Cell and 2-Cell Li-ion Batteries February 16, 2012 The ISL9220, ISL9220A is a cost-effective and versatile Features battery charger for 1-cell and 2-cell Li-ion and Li-Polymer Highly Integrated Battery Charger IC based portable applications. Charges 1- and 2-Cell Li-ion or Li-Polymer Batteries The device features synchronous PWM technology, maximizing power efficiency, thus minimizing charge time and heat. The Up to 2A Charge Current 1.2MHz switching frequency allows use of small external Synchronous Buck Topology with Integrated Power FETs inductors and capacitors. 1.2MHz Switching Frequency A simple charge current programming method is provided. External resistors program the fast charge and end-of-charge 0.5% Charge Voltage Accuracy currents. Programmable Input Current Limit with One External The two status outputs can be used to drive LEDs, or can be Resistor connected to host processor. Thermistor Interface for Battery Detection and Temperature A programmable charge timer provides the ability to detect Qualified Charging defective batteries, and provides a secondary method of Two Status Outputs detecting charge termination. Programmable Charge Safety Timer A thermistor interface is provided for battery presence detection, and for temperature qualified charging conditions. Short-Circuit and Thermal Protection Additional features include preconditioning of an Small 4mmx4mm TQFN Package over-discharged battery, automatic recharge, and thermally -40C to +85C Operating Temperature Range enhanced QFN package. Related Literature Applications TB363 Guidelines for Handling and Processing Moisture PDAs and Smart Phones Sensitive Surface Mount Devices (SMDs) MP3 and Portable Media Players TB379 Thermal Characterization of Packaged Handheld GPS Devices Semiconductor Devices Digital Still Cameras TB389 PCB Land Pattern Design and Surface Mount Industrial Handheld Scanners Guidelines for QFN Packages AN1589, ISL9220IRTZEVAL1Z (1-cell), ISL9220AIRTZEVAL1Z (2-cell) Evaluation Board Pin Configuration ISL9220, ISL9220A (20 LD TQFN) TOP VIEW STAT2 PGND 1 15 EN SW 2 14 AGND SW 3 PAD 13 (AGND) ISET1 VHI 12 4 ISET2 VIN 5 11 FN6936 Rev 3.00 Page 1 of 15 February 16, 2012 VBAT STAT1 6 20 ISNS TIME 7 19 CISP RTH 8 18 CISN VBIAS 9 17 VIN PGND 10 16ISL9220, ISL9220A Pin Descriptions PIN SYMBOL DESCRIPTION 1 STAT2 Open-drain indication pin. In conjunction with STAT1 this pin provides a unique indication for each charging state of the cycle. This pin is capable to sink 10mA minimum current to drive an LED. 2EN IC enable input. Drive this pin to logic LO to enable the charger. Drive this pin to logic HI to disable the charger. Do not leave this pin floating. 3 AGND Analog ground. 4 ISET1 Charge current programing pin. Connect a resistor between this pin and the GND pin to set the charge current. 5 ISET2 End-of-charge current programing pin. Connect a resistor between this pin and the GND pin to set the end-of-charge current. 6 VBAT Battery connection pin. Connect this pin to the battery. A 10F or larger X5R ceramic capacitor is recommended for decoupling and stability purposes. 7 ISNS Output current sense pin. Connect a current sense resistor from this pin to V . No decoupling capacitor is needed at BAT this pin. 8 CISP Input current sense positive connection pin. Connector a sense resistor from this pin the CISN. 9 CISN Input current sense negative connection pin. Connector a sense resistor from this pin the CISP. 10, 11 VIN Input supply voltage. Connect a 4.7F ceramic capacitor from VIN to PGND. 12 VHI High-side NMOS FET gate drive supply pin. Connect the anode of a Schottky diode to VBIAS pin and the cathode to VHI pin. Connect a 0.1F capacitor from VHI pin to SW pin. See Typical Application Diagrams on page 6. 13, 14 SW Switch node and inductor connection pin. 15, 16 PGND Power ground. 17 VBIAS Internal 5V regulator output. Connect a 0.1F ~ 4.7F ceramic capacitor from this pin to AGND. A typical 1F ceramic capacitor is recommended. 18 RTH Input for an external NTC thermistor for battery temperature monitoring. 19 TIME The TIME pin sets the oscillation period by connecting a timing capacitor between this pin and GND. The oscillator also provides a time reference for the charger. The timer function can be disabled by connecting the TIME pin to GND. If the timer is disabled, there will be no timeout function for any operation mode including trickle charge and fast charge modes. 20 STAT1 Open-drain indication pin. In conjunction with STAT2 this pin provides a unique indication for each charging state of the cycle. This pin is capable to sink 10mA minimum current to drive an LED. EPAD Exposed pad. Connect to GND electrically. Thermally, connect as much as possible copper to this pad either on the component layer or other layers through thermal vias to enhance the thermal performance. Ordering Information PACKAGE PART NUMBER NUMBER TEMP. RANGE Tape & Reel PKG. (Notes 1, 2, 3) PART MARKING OF CELLS (C) (Pb-free) DWG. ISL9220IRTZ-T 92 20IRTZ 1 -40 to +85 20 Ld 4x4 TQFN L20.4x4E ISL9220IRTZ-T7A 92 20IRTZ 1 -40 to +85 20 Ld 4x4 TQFN L20.4x4E ISL9220AIRTZ-T 922 0AIRTZ 2 -40 to +85 20 Ld 4x4 TQFN L20.4x4E ISL9220AIRTZ-T7A 922 0AIRTZ 2 -40 to +85 20 Ld 4x4 TQFN L20.4x4E ISL9220IRTZEVAL1Z Evaluation Board ISL9220AIRTZEVAL1Z Evaluation Board NOTES: 1. Please refer to TB347 for details on reel specifications. 2. These Intersil Pb-free plastic packaged products employ special Pb-free material sets, molding compounds/die attach materials, and 100% matte tin plate plus anneal (e3 termination finish, which is RoHS compliant and compatible with both SnPb and Pb-free soldering operations). Intersil Pb- free products are MSL classified at Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020. 3. For Moisture Sensitivity Level (MSL), please see device information page for ISL9220, ISL9220A.For more information on MSL please see techbrief TB363. FN6936 Rev 3.00 Page 2 of 15 February 16, 2012