Highly Integrated, Linear Battery Charger with Thermal Regulation for Portable Applications

First Temperature-Regulated, CC-CV Battery Charger with Overvoltage Protection for Portable Applications

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The MAX1501 intelligent, constant-current, constant-voltage (CCCV), temperature-regulated battery charger charges a single lithium-ion (Li+) cell or three-cell NiMH/NiCd batteries. The device integrates the current-sense resistor, PMOS pass element, and thermal-regulation circuitry, while eliminating the reverse-blocking Schottky diode to create the simplest charging solution for hand-held equipment.

For single-cell Li+ batteries, the MAX1501 functions as a stand-alone charger to control the charging sequence from the prequalification state through fast charge, top-off, and charge termination. With 3-cell NiMH/NiCd batteries, the MAX1501 requires collaboration with a microcontroller to determine the best charging algorithm. 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 charger. The MAX1501 continually supplies a regulated output voltage under no-battery conditions, allowing battery changing without interrupting system power.

The device achieves high flexibility by providing an adjustable fast-charge current, top-off current, safety timer (disabled in the MAX1501Z), and thermal-regulation setpoint. Other features include input power detection (active-low ACOK) and input under-/overvoltage protection. The MAX1501 provides active-low control inputs.

The MAX1501 accepts a 4.5V to 13V supply, but disables charging when the input voltage exceeds 6.5V, preventing excessive power dissipation. The MAX1501 operates over the extended temperature range (-40°C to +85°C) and is available in a compact 16-pin thermally enhanced 5mm x 5mm thin QFN package with 0.8mm profile.
MAX1501: Typical Operating Circuit MAX1501: Typical Operating Circuit Enlarge+

Key Features

  • Stand-Alone 1-Cell Li+ Charging, Microprocessor- Controlled 3-Cell NiMH/NiCd Charging
  • No FET, Reverse-Blocking Diode, or Current- Sense Resistor Required
  • 1.4A (max) Programmable Fast-Charge Current
  • +95°C, +115°C, and +135°C Proprietary Programmable Die Temperature Regulation Control
  • 4.5V to 13V Input Voltage Range with Input Overvoltage (OVLO) Protection Above 6.5V
  • Programmable Top-Off Current Threshold: 10%, 20%, or 30% of the Fast-Charge Current
  • Charge-Current Monitor for Fuel Gauging
  • Programmable Safety Timer (3, 4.5, or 6 hours)
  • Input Power Detection Output (active-low ACOK) and Charge Enable Input (active-low CHGEN)
  • Automatic Recharge
  • Digital Soft-Start Limits Inrush Current
  • Charge Status Outputs for LEDs or µP Interface


  • Bluetooth® Equipment
  • Cell Phones/Cordless Phones
  • Charging Cradles and Docks
  • Digital Cameras and MP3 Players
  • PDAs
  • USB Appliances

See parametric specs for Battery Chargers (74)

Part NumberLithium Ion CellsProtected VIN
Charging VIN
Charge Rate Set byMax. ICHG
Charge TerminationCharge RegulationOper. Temp.
maxmaxSee Notes
MAX1501 1136.25Resistor1.4TimerLinear-40 to +85
$2.31 @1k

Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

MAX1501EVKIT: Evaluation Kit for the MAX1501
Request Reliability Report for: MAX1501 
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C   Material Composition  

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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