EVALUATION KIT AVAILABLE 28V Linear Li+ Battery Charger MAX8814 with Smart Autoboot Assistant General Description Benefits and Features The MAX8814 intelligent, stand-alone constant-current, Reduces External Components and Total Cost constant-voltage (CCCV), thermally regulated linear Integrated Current-Sensing Circuit, MOSFET Pass charger is designed for charging a single-cell lithium-ion Element, and Thermally Regulation Circuitry (Li+) battery. No Reverse Blocking Diode Required The MAX8814 controls the charging sequence from the Guarantees Safe and Accurate Battery Charging prequalification state through constant-current fast- Proprietary Die Temperature Regulation Control charge and the final constant voltage charge. The IC (+115C) Allows Maximum Charging Current achieves high flexibility by providing an adjustable fast- Without Damaging the IC charge current through an external resistor. It also fea- 4.25V to 28V Input Voltage Range with Over- tures a booting assistant circuit that distinguishes input Voltage Protection Above +7V to Protect Against sources and battery connection, and provides an out- Unqualified or Faulty AC Adapters put signal (ABO) for system booting. Soft-Start Limits Inrush Current The device operates over the extended temperature Integrated System Features for Compact Designs range (-40C to +85C), and is available in an 8-pin Programmable Fast-Charge Current: 1A Max RMS thermally enhanced 2mm x 2mm TDFN package Charge-Current Monitor for Fuel Gauging (ISET) (0.8mm max height). Input Power-Source Detection Output (POK) and Charge-Enable Input (EN) Applications Output for Autobooting (ABO) Smartphones Reduce Power Dissipation Portable Music Players Low Dropout Voltage (300mV at 500mA) Digital Still Cameras USB Appliances Ordering Information Charging Cradles and Docks TOP Bluetooth Equipment PART TEMP RANGE PIN-PACKAGE MARK 8 TDFN MAX8814ETA+ -40C to +85C ABI (2mm x 2mm) +Denotes a lead-free and RoHS-compliant package. Typical Operating Circuit BATT + 4.25V TO 28V 2.2F Li+ IN MAX8814 SYSTEM OFF SUPPLY EN ON ABI ISET POK ABO GND EP Bluetooth is a registered trademark of Bluetooth SIG. Pin Configuration appears at end of data sheet. 19-0994 Rev 3 5/1528V Linear Li+ Battery Charger MAX8814 with Smart Autoboot Assistant Absolute Maximum Ratings IN to GND...............................................................-0.3V to +30V BATT Short-Circuit Duration.......................................Continuous ABI, BATT, EN, POK to GND....................................-0.3V to +6V Operating Temperature Range ...........................-40C to +85C ABO to GND............................................-0.3V to (V + 0.3V) Junction Temperature......................................................+150C BATT ISET to GND .............................................................-0.3V to +4V Storage Temperature Range .............................-65C to +150C IN to BATT Continuous Current .........................................1A Lead Temperature (soldering, 10s) .................................+300C RMS Continuous Power Dissipation (T = +70C) A 8-Pin TDFN (derate 11.9mW/C above +70C) (multilayer PCB) ........................................................953.5mW 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, V = 4V, R = 1M to BATT, EN = 0V, R = 2.8k to GND, C = 2.2F, T = -40C to +85C, unless other- IN BATT POK ISET BATT A wise noted. Typical values are at T = +25C.) (Note 1) A PARAMETER CONDITIONS MIN TYP MAX UNITS Input Voltage Range 028V Input Operating Voltage Range 4.25 6.80 V V rising 40 V - V , IN IN BATT Power-OK Threshold mV 10mV hysteresis (typ) V falling 30 IN Overvoltage-Lockout Trip V rising, 100mV hysteresis (typ) 6.8 7 7.5 V IN Threshold Constant-current charging mode (I = 0A) 0.8 1.35 BATT IC disabled (V = 5V) 0.23 0.50 EN IN Input Current mA T = +25C 0.021 0.065 A V = 4V, IN V = 4.2V BATT T = +85C 0.021 A V = 0 to 4V, IN 110 V = 4.2V BATT Input Current BATT A IC disabled 3 T = 0C to +85C 4.179 4.200 4.221 A Battery Regulation Voltage I = 0A V BATT T = -40C to +85C 4.158 4.200 4.242 A Minimum BATT Bypass 2.2 F Capacitance T = 0C to +85C 524 570 616 A V = 3.5V BATT T = -40C to +85C 485 570 656 A Fast-Charge Current mA T = 0C to +85C 89 107 125 A V = 3.5V, BATT R = 14k ISET T = -40C to +85C 80 107 134 A Percentage of the fast-charge current, V = 2.2V, BATT Prequalification Charge Current 410 15% T = 0C to +85C A Die Temperature Regulation +115 C Threshold V Prequalification Threshold BATT V rising, 100mV hysteresis (typ) 2.3 2.5 2.7 V BATT Voltage Current-Sense Amplifier Gain I = 570mA 877.2 A/A BATT (I to I ) BATT ISET www.maximintegrated.com Maxim Integrated 2