MAX1508
Linear Li+ Battery Charger with Integrated Pass FET, Thermal Regulation, and ACOK Flag in 3mm x 3mm TDFN
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Overview
Features and Benefits
- 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 Die-Temperature Regulation Control (+100°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 (Active-Low ACOK)
- Soft-Start Limits Inrush Current
- No Prequalification State for the MAX1508Y and MAX1508Z
- Charge Status Output (Active-Low CHG) for LED or Microprocessor Interface
- Small 3mm x 3mm 8-Pin Thin DFN Package, 0.8mm High
- Active-Low Charge Enable (Active-Low EN) (MAX1508 and MAX1508Z)
- Active-High Charge Enable (EN) (MAX1508Y)
Product Details
The MAX1508 is an intelligent, stand-alone constant-current, constant-voltage (CCCV), thermally regulated linear charger for a single-cell lithium-ion (Li+) battery. The MAX1508 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 MAX1508 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. The MAX1508Y and MAX1508Z eliminate the prequalification state to allow startup into a load without a battery.
Proprietary thermal-regulation circuitry limits the die temperature to +100°C when fast charging or while exposed to high ambient temperatures, allowing maximum charging current without damaging the IC.
The MAX1508 achieves high flexibility by providing an adjustable fast-charge current by an external resistor. Other features include the charging status (active-low CHG) of the battery, an active-low control input (active-low EN) for the MAX1508 and MAX1508Z (active-high control input for the MAX1508Y), and an active-low input power-source detection output (active-low ACOK).
The MAX1508 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 MAX1508 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.
Applications
- Bluetooth® Equipment
- Cell Phones/Cordless Phones
- Charging Cradles and Docks
- Digital Cameras and MP3 Players
- PDAs
- USB Appliances
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Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Evaluation Kits (2)
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