MAX8677A 19-0722 Rev 1 1/07 1.5A Dual-Input USB/AC Adapter Charger and Smart Power Selector General Description Features The MAX8677A is an integrated 1-cell Li+ charger and Complete Charger and Smart Power Selector Smart Power Selector with dual (DC and USB) power No External MOSFETs Required inputs. It can operate with either separate inputs for USB and AC adapter power*, or from a single input that Common or Separate USB and Adapter Inputs accepts both. All power switches for charging and System Operates with Discharged or No Battery switching the load between battery and external power are included on-chip. No external MOSFETs are Automatic Adapter/USB/Battery Switchover required. Load Peaks Over Adapter Rating Are Supported The MAX8677A features a Smart Power Selector to by Battery make the best use of limited USB or adapter power. Input Overvoltage Protection to 16V The battery charge current and input current limit are independently set up to 1.5A and 2A, respectively. 40m System-to-Battery Switch Input power not used by the system charges the bat- Thermal Regulation Prevents Overheating tery. USB input current can be set to 100mA or 500mA. Automatic input selection switches the system load CHG, DOK, UOK, and FLT Indicators from battery to external power. 5.3V (typ) SYS Regulation Voltage Other features include overvoltage protection (OVP), charge status and fault outputs, power-OK monitors, Ordering Information charge timer, and battery thermistor monitor. Additionally, on-chip thermal limiting reduces the battery PIN- PKG charge rate to prevent overheating. The MAX8677A is PART TEMP RANGE PACKAGE CODE available in a 4mm x 4mm, 24-pin TQFN-EP package. 24 TQFN-EP MAX8677AETG+ -40C to +85C T2444-4 (4mm x 4mm) . Applications +Denotes a lead-free package. PDAs, Palmtops, and Wireless Handhelds Smart Cell Phones Pin Configuration Portable Media/MP3 Players GPS Navigation Digital Cameras 18 17 16 15 14 13 CHG 19 12 THM Typical Operating Circuit SYS 20 11 ISET SYS 21 10 CT MAX8677A DOK 22 9 GND AC MAX8677A ADAPTER SYS DC UOK 23 8 VL Q1 CHARGE LOAD FLT 24 7 PSET CURRENT CURRENT SYSTEM LOAD 12 3456 USB USB BAT Q3 Q2 TQFN CHARGE AND (4mm x 4mm x 0.8mm) BATTERY SYS LOAD SWITCH GND Smart Power Selector is a trademark of Maxim Integrated Products, Inc. *Protected by U.S. Patent 6,507,172. Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct at 1-888-629-4642, or visit Maxims website at www.maxim-ic.com. EVALUATION KIT AVAILABLE DONE BAT DC BAT DC USB CEN USB PEN1 TSET PEN2 USUS1.5A Dual-Input USB/AC Adapter Charger and Smart Power Selector ABSOLUTE MAXIMUM RATINGS DC, PEN1 to GND .................................................-0.3V to +16V USB Continuous Current (total in 2 pins) ......................2.0 A RMS USB to GND .............................................................-0.3V to +9V BAT Continuous Current (total in 2 pins).......................2.4 A RMS VL to GND ................................................................-0.3V to +4V Continuous Power Dissipation (T = +70C) A BAT, SYS, CEN, USUS, PEN2, TSET to GND...........-0.3V to +6V (derate 27.8 mW/C above +70C).......................... 2222mW THM, PSET, ISET, CT to GND .........................-0.3V to VL + 0.3V Operating Temperature Range ...........................-40C to +85C DONE, CHG, DOK, UOK, FLT to GND.....................-0.3V to +6V Junction Temperature Range ............................-40C to +125C EP (exposed paddle) to GND ...............................-0.3V to +0.3V Storage Temperature Range .............................-65C to +150C DC Continuous Current (total in 2 pins) ........................2.4 A Lead Temperature (soldering, 10s) .................................+300C RMS SYS Continuous Current (total in 2 pins) .......................2.4 A RMS 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 = 5V, THM = CEN = USUS = GND, V = 4V, V = V = 5V, USB, TSET, DONE, CHG, DOK, UOK, FLT are unconnected, DC BAT PEN1 PEN2 T = -40C to +85C, unless otherwise noted. Typical values are at T = +25C.) (Note 1) A A PARAMETER CONDITIONS MIN TYP MAX UNITS DC-TO-SYS PREREGULATOR DC Operating Range 4.1 6.6 V DC Standoff Voltage V = V = 0V 14 V BAT SYS DC Undervoltage Threshold Whe n V g oes low , V r i si ng , 500m V typi cal hy steres is 3.95 4.0 4.05 V D O K D C DC Overvoltage Threshold W hen V g oes hi g h, V r i si ng , 100m V typi cal hysteres is 6.8 6.9 7.0 V DOK D C I = I = 0mA, V = 0V 1 2 SYS BAT CEN DC Supply Current mA I = I = 0mA, V = 5V 0.8 1.5 SYS BAT CEN DC Shutdown Current V = V = USUS = 5V, V = 0V 195 333 A DC CEN PEN1 DC-to-SYS On-Resistance I = 400mA, V = 5V 0.2 0.35 SYS CEN When SYS regulation and charging stops, V falling, DC DC-to-BAT Dropout Voltage 10 50 90 mV 150mV hysteresis R = 1.5k 1800 2000 2200 PSET R = 3k 900 1000 1100 PSET R = 6.3k 450 475 500 PSET DC Current Limit V = 6V, V = 5V, DC SYS mA (See Table 2 for Input Source V = 0V, V = 5V PEN1 PEN2 T = +25C A 450 475 500 Control) (500mA USB mode) V = 0V, V = 0V PEN1 PEN2 80 95 100 (100mA USB mode) PSET Resistance Range 1.5 6.3 k SYS Regulation Voltage V = 6V, I = 1mA to 1.75A, V = 5V 5.1 5.3 5.5 V DC SYS CEN Connecting DC when no USB present 1.5 ms Input Current Soft-Start Time Connecting DC with USB present 50 s Die temperature at which charging and input current limits Thermal-Limit Temperature 100 C are reduced Thermal-Limit Gain I reduction/die temperature (above +100C) 5 %/C SYS VL Voltage I = 0mA to 10mA 3.0 3.3 3.6 V VL 2 MAX8677A