The MAX8808X/MAX8808Y/MAX8808Z intelligent, stand-alone constant-current/constant-voltage (CCCV), thermally regulated linear chargers are designed for charging a single-cell lithium-ion (Li+) battery. The MAX8808X/MAX8808Y/MAX8808Z integrate the current-sense circuit, MOS pass element, and thermal-regulation circuitry, and eliminate the reverse-blocking Schottky diode to create the simplest and smallest charging solution for handheld equipment. The MAX8808XETA functions as a stand-alone charger to control the charging sequence from the prequalification state through fast-charge, top-off charge, and fullcharge indication. The MAX8808Y and MAX8808Z eliminate the prequalification state to allow startup into a load without a battery. 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 MAX8808X/MAX8808Y/MAX8808Z achieve high flexibility by providing an adjustable fast-charge current with an external resistor. Other features include a battery charging-status indicator (active-low CHG), an active-low control input (EN) for the MAX8808XETA and MAX8808Z (active-high control input for the MAX8808Y), and an active-low input power-source detection output (active-low ACOK). The MAX8808X/MAX8808Y/MAX8808Z accept a +4.25V to +15V supply, but disable charging when the input voltage exceeds +7V to protect against unqualified or faulty AC adapters. The MAX8808X/MAX8808Y/MAX8808Z operate over the extended temperature range (-40°C to +85°C) and are available in a compact 8-pin thermally enhanced 2mm x 2mm TDFN package with 0.8mm (max) 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 (1A max)
- Proprietary Die Temperature Regulation Control (+115°C)
- +4.25V to +15V Input Voltage Range with Input OVP Above +7V
- Charge-Current Monitor for Fuel Gauging
- Low Dropout Voltage—300mV at 500mA
- Input Power-Source Detection Output (Active-Low ACOK) and Charge-Enable Input (Active-Low EN or EN)
- Soft-Start Limits Inrush Current
- Charge-Status Output (Active-Low CHG) for LED or Microprocessor (μP) Interface
- Tiny 2mm x 2mm 8-Pin TDFN Package, 0.8mm (max) Height
Applications
- Cell Phones/Cordless Phones
- Charging Cradles and Docks
- Digital Still Cameras and MP3 Players
- Smartphones and PDAs
- USB Appliances
