Li-ion/Li-Polymer Battery Charger Accepting Two Power Sources

® ISL6299A Data Sheet January 3, 2006 FN9212.1 Li-ion/Li-Polymer Battery Charger Accepting Two Power Sources The ISL6299A is a fully integrated low-cost single-cell Li-ion or Li-polymer battery charger. The charger accepts two power inputs, normally one from a USB (Universal Serial Bus) port and the other from a desktop cradle. The ISL6299A is an ideal charger for smart handheld devices that need to communicate with a personal computer via USB. The ISL6299A features 28V and 7V maximum voltages for the cradle and the USB inputs respectively. Due to the 28V rating for the cradle input, low-cost, large output tolerance adapters can be used safely. When both inputs are powered, the cradle input is used to charge the battery. The charge current is programmable for the cradle input with a small resistor. The end-of-charge current for the cradle input is also programmable by another external resistor. The charger incorporates Thermaguard™ which protects the IC against over temperature. If the die temperature rises above a typical value of 100°C, a thermal foldback function reduces the charge current automatically to prevent further temperature rise. The charger preconditions the battery with low current when the battery voltage is below 2.6V. The charger has two indication pins. The PPR (power present) pin outputs an open-drain logic LOW when either the cradle or the USB input power is attached. The CHG (charge) pin is also an open-drain output that indicates a logic LOW when the charge current is above a minimum current level. When the charge current is below the minimum current, the CHG pin indicates a logic HIGH signal and the status is latched. The latch will be reset at one of these events: (1) the part is disabled and re-enabled; (2) the selected input source has been removed and re-applied, (3) The USBON turns LOW, or (4) The BAT pin voltage falls below the recharge threshold (~4.0V). Features • Complete Charger for Single-Cell Li-ion/Polymer Batteries • Dual Input Power Sources for Cradle and USB • Low Component Count • Integrated Pass Element • Fixed 380mA USB Charge Current • Programmable Cradle Charge Current • Charge Current Thermaguard™ for Thermal Protection • 28V Maximum Voltage for the Cradle Input • Charge Indication • Adapter Presence Indication • Less than 0.5µA Leakage Current off the Battery when No Input Power Attached • Programmable end-of-charge current with latch for Cradle Input • Ambient Temperature Range: -40°C to 85°C • No External Blocking Diode Required • Pb-Free Plus Anneal Available (RoHS Compliant) Applications • Smart Handheld Devices • Cell Phones, PDAs, MP3 Players • Digital Still Cameras • Handheld Test Equipment Related Literature • Technical Brief TB363 “Guidelines for Handling and Processing Moisture Sensitive Surface Mount Devices (SMDs)” • Technical Brief TB389 “PCB Land Pattern Design and Surface Mount Guidelines for QFN Packages” Ordering Information PART # ISL6299AIRZ (Note) PART TEMP. MARKING RANGE (°C) 99AZ -40 to 85 PACKAGE PKG. DWG. # 10 Ld 3x3 DFN L10.3x3C (Pb-free) Pinout ISL6299A (DFN) TOP VIEW ISL6299AIRZ-T 99AZ (Note) 10 Ld 3x3 DFN Tape and Reel (Pb-free) CRDL USB PPR CHG EN 1 2 3 4 5 NOTE: Intersil Pb-free plus anneal products employ special Pb-free material sets; molding compounds/die attach materials and 100% matte tin plate termination finish, which are 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. 10 BAT 9 8 7 6 ICDL GND USBON IMIN 1 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. 1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc. Copyright Intersil Americas Inc. 2005-2006. All Rights Reserved. Thermaguard is a trademark of Intersil Americas Inc. All other trademarks mentioned are the property of their respective owners. ISL6299A Block Diagram CRDL USB BAT TEMP MONITOR CA + CPPR VA ICDL REFERENCE CURRENT CONTROL + VREF IR IMIN USB CPPR LBAT CRDL BAT ENA PPR CONTROL CHG EN GND USBON 2 FN9212.1 January 3, 2006 ISL6299A Typical Applications A Simple Charger Accepting Power from Both a USB Port and a Desktop Cradle TO CRADLE CONNECTOR TO USB CONNECTOR R1 C2 C1 USB TO BATTERY CRDL BAT ICDL ISL6299A USBON PPR CHG EN RIMIN IMIN GND DISABLE ENABLE RICD L C3 ON OFF R2 D1 R3 D2 COMPONENT SELECTION RICDL RIMIN R2, R3 C1, C2, C3 R1 D1, D2 28.71kΩ for 0.55A cradle charge current 158kΩ for 80mA end-of-charge current 350Ω 1µF ceramic capacitor 1Ω LEDs A Simple Charger with Programmable Charge Current and Wide Input Voltage Range TO CRADLE CONNECTOR C1 USB TO BATTERY CRDL BAT ICDL R2 USBON PPR CHG EN RIMIN IMIN GND DISABLE ENABLE D1 D2 R3 ISL6299A RICDL C3 COMPONENT SELECTION RICDL RIMIN R2, R3 C1, C3 R1 D1, D2 28.71kΩ for 0.55A cradle charge current 158kΩ for 80mA end-of-charge current 350Ω 1µF ceramic capacitor 1Ω LEDs 3 FN9212.1 January 3, 2006 ISL6299A Absolute Maximum Ratings Supply Voltage (USB) . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 7V Supply Voltage (CRDL) . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 28V Other Input Voltage (EN, USBON, ICDL, IMIN, BAT) . . . -0.3V to 7V Open-Drain Pull-Up Voltage (PPR, CHG) . . . . . . . . . . . . -0.3V to 7V Thermal Information Thermal Resistance θJA (°C/W) θJC (°C/W) DFN Package (Notes 1, 2) . . . . . . . . . . 40 2.5 Maximum Junction Temperature (Plastic Package) . . . . . . . . 150°C Maximum Storage Temperature Range . . . . . . . . . . . -65°C to 150°C Maximum Lead Temperature (Soldering 10s) . . . . . . . . . . . . . 300°C Recommended Operating Conditions Ambient Temperature Range . . . . . . . . . . . . . . . . . . . .-40°C to 85°C Supply Voltage (USB Pin) . . . . . . . . . . . . . . . . . . . . . . 4.3V to 5.5V Supply Voltage (CRDL Pin) . . . . . . . . . . . . . . . . . . . . . . 4.3V to 24V Typical Cradle Charge Current . . . . . . . . . . . . . . . . . . 300mA to 1A Typical USB Charge Current . . . . . . . . . . . . . . . . . . . . . . . . . 380mA CAUTION: Stresses above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. NOTES: 1. θJA is measured in free air with the component mounted on a high effective thermal conductivity test board with “direct attach” features. See Tech Brief TB379. 2. For theta θJC the "case temp." location is the center of the exposed metal pad on the package underside. Electrical Specifications PARAMETER POWER-ON RESET Rising USB/CRDL Threshold Falling USB/CRDL Threshold VIN-BAT OFFSET VOLTAGE Rising Edge Falling Edge STANDBY CURRENT BAT Pin Sink Current CRDL Pin Supply Current USB Pin Supply Current CRDL/USB Pin Supply Current VOLTAGE REGULATION Output Voltage (Note 4) Typical Values Are Tested at USB = CRDL = 5V and ambient temperature is at 25°C, Unless Otherwise Noted. All Maximum and Minimum Values Are Guaranteed Under the Recommended Operating Conditions. SYMBOL TEST CONDITIONS MIN TYP MAX UNITS 3.4 3.2 3.9 3.7 4.2 4.0 V V VOS VOS VBAT = 4.0V, use CHG pin to indicate the comparator output (Note 3) 20 150 80 250 - mV mV ISTANDBY EN = HIGH or both inputs are floating ICRDL IUSB EN = LOW or floating EN = HIGH - 0.05 150 150 0.4 0.5 220 220 0.8 µA µA µA mA VCH Load = 10mA VBAT = 3.8V, ICHARGER = 0.3A VBAT = 3.8V, ICHARGER = 0.3A 4.158 200 200 4.2 600 700 4.242 900 900 V mΩ mΩ CRDL PMOS On Resistance (Note 8) USB PMOS On Resistance (Note 8) CHARGE CURRENT (Note 5) ICDL Pin Output Voltage CRDL Input Constant Charge Current CRDL Input Trickle Charge Current CRDL End-of-Charge Threshold USB Input Constant Charge Current (Note 6) USB Input Trickle Charge Current (Note 4) USB End-of-Charge Threshold VICDL VBAT = 3.8V 1.17 500 11 69 325 12 64 1.20 550 15 88 380 14 76 1.23 600 19 107 425 17 84 V mA % mA mA % mA ICHARGE RICDL = 28.7kΩ, VBAT = 3.8V, VCRDL = 5V ITRICKLE IMIN RICDL = 28.7kΩ, VBAT = 2.0V, VCRDL = 5V Given as a % of the CRDL ICHARGE RIMIN = 158kΩ ICHARGE USBON = HIGH, VBAT = 3.8V ITRICKLE IMIN VBAT = 2.0V, given as a % of the USB ICHARGE 4 FN9212.1 January 3, 2006 ISL6299A Electrical Specifications PARAMETER Typical Values Are Tested at USB = CRDL = 5V and ambient temperature is at 25°C, Unless Otherwise Noted. All Maximum and Minimum Values Are Guaranteed Under the Recommended Operating Conditions. (Continued) SYMBOL TEST CONDITIONS MIN TYP MAX UNITS PRECONDITIONING CHARGE THRESHOLD Preconditioning Charge Threshold Voltage INTERNAL TEMPERATURE MONITORING Current Foldback Threshold (Note 7) LOGIC INPUT AND OUTPUT USBON Logic Input High USBON Logic Input LOW EN Pin Logic Input High EN Pin Logic Input Low EN Pin Internal Pull Down Resistance USBON Pin internal Pull Down Resistance CHG/PPR Sink Current NOTES: 3. The 4.0V VBAT is selected so that the CHG output can be used as the indication for the offset comparator output indication. If the VBAT is lower than the POR threshold, no output pin can be used for indication. 4. The maximum and minimum limits are guaranteed over -40°C to 70°C ambient temperature range. 5. The charge current can be affected by the thermal foldback function if the IC under the test setup cannot dissipate the heat. 6. Constant current can be affected if the junction temperature exceeds 70 °C. 7. Guaranteed by characterization or correlation to other test. 8. Tested at TJ = 25°C. Pin Voltage = 0.8V 1.3 1.3 350 700 10 600 1000 0.4 0.4 850 1300 V V V V kΩ kΩ mA TFOLD 85 100 115 °C VMIN 2.5 2.6 2.7 V Functional Pin Description CRDL (Pin 1) Crad