Stand-Alone, Switch-Mode Li+ Battery Charger with Internal 28V Switch

Please check latest availability status for a specific part variant.


The MAX1758 is a switch-mode lithium-ion (Li+) battery charger that charges one-to-four cells. It provides a regulated charging current accurate to ±10% and a regulated voltage with only a ±0.8% total voltage error at the battery terminals. The internal high-side switch delivers a programmable current of up to 1.5A to charge the battery. The built-in safety timer automatically terminates charging once the adjustable time limit has been reached.

The MAX1758 regulates the voltage set point and charging current using two loops that work together to transition smoothly between voltage and current regulation. An additional control loop monitors the total current drawn from the input source (charging + system), and automatically reduces battery-charging current, preventing overload of the input supply and allowing the use of a low-cost wall adapter.

The per-cell battery regulation voltage is set between 4.0V and 4.4V using standard 1% resistors. The number of cells is set from 1-to-4 by pin strapping. Battery temperature is monitored by an external thermistor to prevent charging outside the acceptable temperature range.

The MAX1758 is available in a space-saving 28-pin SSOP package. Use the MAX1758EVKIT to help reduce design time. For a stand-alone charger with a 14V switch, refer to the MAX1757 data sheet. For a charger controller capable of up to 4A charging current, refer to the MAX1737 data sheet.
MAX1758: Typical Operating Circuit MAX1758: Typical Operating Circuit Enlarge+

Key Features

  • Stand-Alone Charger for Up to 4 Li+ Batteries
  • ±0.8% Battery Regulation Voltage Accuracy
  • Low-Dropout 98% Duty Cycle
  • Safely Precharges Near-Dead Cells
  • Continuous Voltage and Temperature Monitoring
  • 0.1µA Shutdown Battery Current
  • Input Voltage Up to 28V
  • Up to 1.5A Programmable Charge Current
  • Safety Timer Prevents Overcharging
  • Input Current Limiting
  • Space-Saving 28-Pin SSOP
  • 300kHz PWM Oscillator Reduces Noise


  • Desktop Cradle Chargers
  • Handheld Instruments (PDAs, Palmtops)
  • Li+ Battery Packs
  • Notebook Computers

See parametric specs for Battery Chargers (73)

Part NumberLithium Ion CellsProtected VIN
Charging VIN
Charge Rate Set byMax. ICHG
Charge TerminationCharge RegulationOper. Temp.
maxmaxSee Notes
2828Resistor1.5TimerSwitchmode-40 to +85
$3.71 @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.

MAX1757EVKIT: Evaluation Kit for the MAX1757, MAX1758
MAX1758EVKIT: Evaluation Kit for the MAX1757, MAX1758
Product Reliability Reports: MAX1758.pdf 
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.

Quality Management System >
Environmental Management System >


Related Resources

23VIN 3.2AOUT USB-C Buck-Boost Charger with Integrated FETs for 2S Li-Ion Batteries

  • 3.5V to 23V Input Operating Range, 30VDC Withstand Voltage
  • Reverse Leakage Protection
  • 50mA to 3.15A Programmable Input Current Limit

2S-4S ModelGauge m5 EZ Fuel Gauge with Protector, Internal Self-Discharge Detection, and SHA-256 Authentication

  • Battery Health + Programmable Safety/Protection
  • ModelGauge m5 EZ Algorithm
  • Precision Measurement Without Calibration

12-Channel High-Voltage Data Acquisition System

  • AEC-Q100 Grade 2 Temperature Range
  • Operating Voltage from 9V to 65V
  • Ultra-Low-Power Operation