The MAX1507ETA is an intelligent, stand-alone constant-current, constant-voltage (CCCV), thermally regulated linear charger for a single-cell lithium-ion (Li+) battery. The MAX1507ETA integrates the current-sense circuit, MOS pass element, and thermal-regulation circuitry, and also eliminates the reverse-blocking Schottky diode to create the simplest and smallest charging solution for hand-held equipment. The MAX1507ETA functions as a stand-alone charger to control the charging sequence from the prequalification state through fast-charge, top-off charge, and full-charge indication. Proprietary thermal-regulation circuitry limits the die temperature when fast charging or while exposed to high ambient temperatures, allowing maximum charging current without damaging the IC. The MAX1507ETA achieves high flexibility by providing an adjustable fast-charge current and thermal regulation setpoints. Other features include the charging status (active-low CHG) of the battery and an active-low control input (active-low EN). The MAX1507ETA accepts a +4.25V to +13V supply, but disables charging when the input voltage exceeds +7V to protect against unqualified or faulty AC adapters. The MAX1507ETA operates over the extended temperature range (-40°C to +85°C) and is available in a compact 8-pin thermally enhanced 3mm x 3mm Thin DFN package with 0.8mm height.
Feature
- Stand-Alone Linear 1-Cell Li+ Battery Charger
- No External FET, Reverse-Blocking Diode, or Current-Sense Resistor Required
- Programmable Fast-Charge Current (0.8A max)
- Proprietary Programmable Die-Temperature Regulation Control (+90°C, +100°C, and +130°C)
- +4.25V to +13V Input Voltage Range with Input Overvoltage Protection (OVP) Above +7V
- Charge-Current Monitor for Fuel Gauging
- Low Dropout Voltage—130mV at 0.425A
- Input Power-Source Detection Output (VL) and Charge-Enable Input (Active-Low EN)
- Soft-Start Limits Inrush Current
- Charge Status Output (Active-Low CHG) for LED or Microprocessor Interface
- Small 3mm x 3mm 8-Pin Thin DFN Package, 0.8mm High
Applications
- Bluetooth? Equipment
- Cell Phones/Cordless Phones
- Charging Cradles and Docks
- Digital Cameras and MP3 Players
- PDAs
- USB Appliances
