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MAX8844Z Dataheets PDF



Part Number MAX8844Z
Manufacturers Maxim Integrated Products
Logo Maxim Integrated Products
Description 28V Dual Input Linear Li+ Battery Chargers
Datasheet MAX8844Z DatasheetMAX8844Z Datasheet (PDF)

19-4279; Rev 0; 3/09 EVALUATION KIT AVAILABLE 28V Dual Input Linear Li+ Battery Chargers with Battery Detection and Overvoltage-Protected Output www.datasheet4u.com General Description Features ♦ CCCV, Thermally Regulated Linear One-Cell Li+ Battery Charger ♦ No External MOSFET, Reverse Blocking Diode, or Current-Sense Resistor ♦ Programmable Fast-Charge Currents (1ARMS max) ♦ Programmable Top-Off Current Threshold ♦ Input Overvoltage Protected 4.7V Output (SAFEOUT) from IN ♦ Input Overvolta.

  MAX8844Z   MAX8844Z



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19-4279; Rev 0; 3/09 EVALUATION KIT AVAILABLE 28V Dual Input Linear Li+ Battery Chargers with Battery Detection and Overvoltage-Protected Output www.datasheet4u.com General Description Features ♦ CCCV, Thermally Regulated Linear One-Cell Li+ Battery Charger ♦ No External MOSFET, Reverse Blocking Diode, or Current-Sense Resistor ♦ Programmable Fast-Charge Currents (1ARMS max) ♦ Programmable Top-Off Current Threshold ♦ Input Overvoltage Protected 4.7V Output (SAFEOUT) from IN ♦ Input Overvoltage Protected 4.7V Output (SAFEUSB) from USB ♦ Proprietary Die Temperature Regulation Control (+115°C) ♦ 4.25V to 28V Input Voltage Range with Input Overvoltage Protection Above +7.5V ♦ Low-Dropout Voltage (300mV at 500mA) ♦ Input Power-Source Detection Output (POK), Charge Status Output (CHG), Charge-Enable Input (EN) ♦ Output for Autobooting (ABO, MAX8844Z) ♦ Output for Autobooting (ABO, MAX8844Y) ♦ Tiny 3mm x 3mm, 14-Pin TDFN Package, 0.8mm Height (max) MAX8844Z/MAX8844Y The MAX8844Z/MAX8844Y intelligent, stand-alone constant-current, constant-voltage (CCCV), thermally regulated dual input linear chargers are designed for charging a single-cell lithium-ion (Li+) battery. The MAX8844Z/MAX8844Y integrate a current-sense circuit, MOSFET pass element, thermal-regulation circuitry, and eliminate the external reverse-blocking Schottky diode to create the simplest and smallest charging solutions for handheld equipment. The IC controls the charging sequence from the prequalification state through constant current fast-charge, top-off charge, and full-charge indication. Proprietary thermal-regulation circuitry limits the die temperature during fast-charging or when the IC is exposed to high ambient temperatures, allowing maximum charging current without damaging the IC. The MAX8844Z/MAX8844Y achieve high flexibility by providing adjustable fast-charge currents (SETI) and an adjustable top-off current threshold (MIN) through external resistors. The IC features a booting assistant circuit that distinguishes input sources and battery connection and provides an enable signal (ABO, ABO) for system booting. The ICs also integrate two input overvoltage-protected LDO outputs (SAFEOUT, SAFEUSB) for low-voltagerated USB or charger inputs in system, and a battery pack detection circuit (DETBAT) that disables the charger when the battery pack is absent. Other features include an active-low control input (EN), an active-low input power source detection output (POK), and a fully charged top-off threshold detection output (CHG). The MAX8844Z/MAX8844Y automatically select between either the USB or IN source. If both sources are present at the same time, highest priority is given to the IN source. The IN source is selected to ensure the shortest charging time for the system since it is able to deliver the highest current. The MAX8844Z/MAX8844Y accept an input supply range from 4.25V to 28V (IN and USB), but disable charging if the input voltage exceeds +7.5V to protect against unqualified or faulty AC adapters. The ICs operate over the extended temperature range (-40°C to +85°C) and are available in a compact 14-pin, thermally enhanced, leadfree TDFN 3mm x 3mm package (0.8mm max height). Ordering Information PART MAX8844ZETD+ MAX8844YETD+ PINPACKAGE 14 TDFN-EP* 14 TDFN-EP* TOP MARK AEK AEN ABO ACTIVE STATE Active high Active low +Denotes a lead(Pb)-free/RoHS-compliant package. *EP = Exposed pad. Applications Cellular and Cordless Phones Smart Phones and PDAs Digital Still Cameras MP3 Players Bluetooth is a registered trademark of Bluetooth SIG. Note: All devices are specified over the -40°C to +85°C operating temperature range. USB Appliances Charging Cradles and Docks Bluetooth® Equipment Typical Operating Circuit and Pin Configuration appear at end of data sheet. ________________________________________________________________ Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. 28V Dual Input Linear Li+ Battery Chargers with Battery Detection and Overvoltage-Protected Output MAX8844Z/MAX8844Y ABSOLUTE www.datasheet4u.com MAXIMUM RATINGS Junction Temperature ......................................................+150°C Storage Temperature Range .............................-65°C to +150°C Lead Temperature (soldering, 10s) .................................+300°C IN, USB to GND......................................................-0.3V to +30V ABI, BATT, EN, POK, ABO, ABO, CHG, DETBAT, SETI, MIN, SAFEOUT, SAFEUSB to GND.................................................-0.3V to +6V IN to BATT Continuous Current .........................................1ARMS Continuous Power Dissipation (TA = +70°C) 14 TDFN (derate 24.4mW/°C above 70°C) (multilayer PCB) ....................................................1951.2mW BATT Short-Circuit Duration .......................................Continuous Operating Temperature Range ..


MAX8844Y MAX8844Z MAX8845Y


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