MAX8856 19-4277 Rev 0 9/08 USB/AC Adapter, Li+ Linear Battery Charger with Integrated 50m Battery Switch in TDFN General Description Features The MAX8856 complete 1-cell Li+ battery charge-man- Small, 3mm x 3mm Thermally Enhanced TDFN agement IC operates from either a USB port or AC Package (0.8mm max height) adapter. It integrates a battery disconnect switch, cur- USB-Compliant Suspend Mode (20A) rent-sense circuit, PMOS pass element, and thermal- Selectable 100mA, 500mA, and Up to 1A Input regulation circuitry, while eliminating the external reverse-blocking Schottky diode, to create a simple Current Limits and small charging solution. The charging sequence USB or AC Adapter Input initiates from power-OK indication, through prequalifi- +6V to +14V Input Overvoltage Protection cation, fast-charge, top-off charge, and finally charg- ing-complete indication for single-cell Li+ batteries. Input UVLO Below +4V Rising (3.5V Falling) Charging is controlled using constant current, constant Automatic Current Sharing Between Battery voltage, or constant die-temperature (CCCVCT ) regu- J Charging and System lation for safe operation in handhelds. Die Temperature Regulation (+100C) Two logic inputs (EN1, EN2) select suspend mode, 100mA, 500mA, or 1A input current limits to comply Low Dropout Voltage, 250mV at 0.5A with USB requirements. Proprietary thermal-regulation NTC Thermistor Input circuitry limits the die temperature to +100C to prevent Charge Status and Input-Supply Detection Flags excessive heat on the system PC board. Additional safety features include an NTC thermistor input (THM) to protect the battery. A 3.5V to 4.2V SYS output, in Ordering Information conjunction with the low-R battery switch, powers DSON the system even when the battery is deeply discharged TOP or not installed. The IC also offers a +3.3V/500A out- PART TEMP RANGE PIN-PACKAGE MARK put (V ), a charging status flag (CHG), and an input- L supply detection flag (POK). The MAX8856 operates 14 TDFN 3mm x MAX8856ETD+ -40C to +85C AEJ from a +4.25V to +5.5V supply and includes undervolt- 3mm (T1433-1) age lockout below +3.4V and overvoltage protection +Denotes a lead-free/RoHS-compliant package. up to +14V. Applications Typical Operating Circuit Cellular Phones, Smartphones, PDAs Digital Cameras, MP3 Players USB Appliances, Charging Cradles and Docks STATUS INDICATORS USB/AC-ADAPTER OVP UP TO 14V CHG IN Pin Configuration POK 3.5V TO 4.2V SYS 0.1F GND TOP VIEW V L CONTROL 14 13 12 11 10 9 8 INPUT EN1 BAT CURRENT EN2 SELECTION MA8856 GATE P SETI MAX8856 THM 1 2 3 4 5 6 7 TDFN Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxims website at www.maxim-ic.com. EVALUATION KIT AVAILABLE + BAT SYS BAT SYS IN SETI V GND L THM EN1 CHG EN2 POK GATEUSB/AC Adapter, Li+ Linear Battery Charger with Integrated 50m Battery Switch in TDFN ABSOLUTE MAXIMUM RATINGS IN to GND.............................................................. -0.3V to +16V Continuous Power Dissipation (T = +70C) A BAT, SYS, EN1, EN2, POK, CHG, GATE to GND.....-0.3V to +6V 14-Pin 3mm x 3mm TDFN (derate 18.2mW/C V , SETI, THM to GND..............................................-0.3V to +4V above +70C)...........................................................1454mW L SYS to BAT ...............................................................-0.3V to +6V Operating Temperature Range ...........................-40C to +85C V to IN ...................................................................-16V to +0.3V Junction Temperature Range ............................-40C to +150C L IN to BAT Current ...........................................................1.0A Storage Temperature Range .............................-65C to +150C RMS IN to SYS Current ...........................................................1.0A Lead Temperature (soldering, 10s) .................................+300C RMS BAT to SYS Current ........................................................1.0A RMS BAT Short-Circuit Duration.........................................Continuous Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. ELECTRICAL CHARACTERISTICS (V = 5.0V, V = 3.3V, EN1 = EN2 = GND, R = 23.58k, C = 0.1F, C = 4.7F, T = -40C to +85C, unless otherwise IN BAT SETI VL SYS A noted. Typical values are at T = +25C.) (Note 1) A PARAMETER CONDITIONS MIN TYP MAX UNITS IN IN Voltage Range 014V IN Operating Voltage Range (Note 2) 4.25 5.50 V IN Undervoltage Threshold V rising, 500mV hysteresis (typ) 3.9 4.0 4.1 V IN IN Overvoltage Threshold V rising, 150mV hysteresis (typ) 5.6 5.8 6.0 V IN Charging, I = I = 0mA 1.2 3.0 mA BAT SYS IN Supply Current Suspend, EN1 = EN2 = high, I = 0mA 20 40 A VL T = +25C 0.1 10 A IN to BAT Switch Leakage V = 14V, BAT = GND A IN T = +85C 0.5 A SYS SYS Regulated Voltage I = 0mA, V = 3.3V 3.4 3.5 3.6 V SYS BAT EN1 = low, EN2 = low 90 96 100 SYS Current Limit V = 3.3V EN1 = low, EN2 = high 450 475 500 mA SYS EN1 = high, EN2 = low 675 712 750 SYS Dropout Voltage (V - V )I = 400mA, V = 3.3V, EN1 = low, EN2 = high 350 700 mV IN BAT SYS SYS SYS Load Regulation I = 1mA to 675mA, EN1 = high, EN2 = low 10 mV SYS BAT T = +25C 4.18 4.20 4.22 A BAT Regulation Voltage I = 0mA V BAT T = -40C to +85C 4.16 4.20 4.24 A Maximum Charging Current 1 A I = 0mA 87 95 100 SYS EN1 = low, EN2 = low I = 50mA 45 SYS I = 0mA 450 475 500 EN1 = low, SYS BAT Charging Current mA EN2 = high I = 250mA 225 SYS I = 0mA 675 712 750 EN1 = high, SYS EN2 = low I = 375mA 337 SYS 2 MAX8856