Click here for production status of specific part numbers. MAX1811 USB-Powered Li+ Charger General Description Features The MAX1811 is a single-cell lithium-ion (Li+) battery Charges Single-Cell Li+ Batteries Directly from charger that can be powered directly from a USB port* or USB Port from an external supply up to 6.5V. It has a 0.5% overall 0.5% Overall Charging Accuracy battery regulation voltage accuracy to allow maximum Minimal External Components utilization of the battery capacity. Input Diode Not Required The charger uses an internal FET to deliver up to 500mA Automatic IC Thermal Regulation charging current to the battery. The device can be configured for either a 4.1V or 4.2V battery, using the Preconditions Near-Depleted Cells SELV input. The SELI input sets the charge current to Convenient Power SO-8 Package (1.4W) either 100mA or 500mA. An open-drain output (CHG) indicates charge status. Ordering Information The MAX1811 has preconditioning that soft-starts a near-dead battery cell before charging. Other safety PART TEMP RANGE PIN-PACKAGE features include continuous monitoring of voltage and MAX1811ESA -40C to +85C 8 SO current and initial checking for fault conditions before charging. The MAX1811 is available in a small 1.4W thermally enhanced 8-pin SO package. Applications PDAs and Palmtops Digital Still Cameras MP3 Players Cell Phones Two-Way Pagers Hand-Held Computers Typical Operating Circuit Typical Operating Circuit TOP VIEW TO LOAD BATT SINGLE 4.35V TO 6.5V IN Li+ 4.2V MAX1811 CELL SELV 1 8 CHG SELV 4.1V SELI 2 7 EN TO IN MAX1811 ON LED GND 3 6 GND EN OFF 500mA CHG IN 4 5 BATT SELI CHG 100mA GND LOGIC OUT SO 19-2024 Rev 3 4/19MAX1811 USB-Powered Li+ Charger Absolute Maximum Ratings IN, BATT, SELI, CHG, EN to GND ............................-0.3V to 7V Operating Temperature Range ........................... -40C to +85C SELV to GND .............................................-0.3V to (V + 0.3V) Storage Temperature Range ............................ -65C to +150C IN Continuous Power Dissipation (T = +70C) Maximum Die Temperature .............................................+150C A 8-Pin SO (derate 17.5mW/C above +70C) ...................1.4W Lead Temperature (soldering, 10s) .................................+300C 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 = 4.5V, EN = IN, T = 0C to +85C, unless otherwise noted.) IN A PARAMETER CONDITIONS MIN TYP MAX UNITS Input Supply Voltage 4.35 6.50 V Input Undervoltage Lockout I rising 3.75 4.05 V IN Input Undervoltage Lockout Hysteresis 50 mV Operating, EN = IN, no load 0.9 2.0 mA Input Supply Current Shutdown, EN = GND 2.5 5.0 A SELI = GND (100mA mode), 100 V = 4.35V IN Charging Headroom mV SELI = IN (500mA mode) 200 BATT rising, transition from precondition Precondition Threshold 2.3 2.5 2.7 V to charge mode Precondition Threshold Hysteresis 80 mV CHG Output Leakage Current V = V = 6.5V 0.1 1.0 A IN CHG CHG Output Low Voltage I = 10mA 0.4 V SINK V = V = 5.5V, V = 2.7V 455 500 SELI IN BATT Charging Current SELI = GND, V = 5.5V, V = 2.7V 85 100 mA IN BATT V = 2V, SELI = GND or IN 20 43 70 BATT SELV = GND, I = 0 4.08 4.10 4.12 BATT BATT Regulation Voltage V SELV = IN, I = 0 4.18 4.20 4.22 BATT BATT Leakage Current V = 4.2V, EN = IN = GND 1 5 A BATT (Input Power Removed) BATT Shutdown Current EN = GND, V = 4.2V 0.1 2 A BATT Logic Input Low Voltage (EN, SELI, SELV) V = 4.35V to 6.5V 0.8 V IN Logic Input High Voltage (EN, SELI, SELV) V = 4.35V to 6.5V 2.0 V IN Logic Input Leakage Current (EN, SELI) V = 0 to 6.5V V , V = 6.5V or GND 1 A IN SELI EN Logic Input Leakage Current (SELV) V = 0 to 6.5V, V = V or GND 1 A IN SELV IN Die temperature beyond which charging Thermal Regulation 125 C current is reduced Maxim Integrated 2 www.maximintegrated.com