MAX1757
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MAX1757

Stand-Alone, Switch-Mode Li+ Battery Charger with Internal 14V Switch

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Compact, 1-to-3 Cell Lithium-Ion Battery Charger Uses Internal Power Switch to Deliver Up to 1.5A

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Part Details
Part Models 2
1ku List Price Starting From $9.51
Features
  • Stand-Alone Charger Safely Charges Up to Three Li+ Batteries
    • Continuous Voltage and Temperature Monitoring
    • Input Current Limiting
    • ±0.8% Battery Regulation Voltage Accuracy
    • Up to 1.5A Programmable Charge Current
  • Low Power Consumption Extends Battery Life
    • 0.1µA Shutdown Battery Current
    • Low-Dropout 98% Duty Cycle
  • Flexible Input Voltage Range Enables the Use of Low Cost Wall Adapters
    • Input Voltage Up to 14V
    • Precharges Near-Dead Cells
  • Fixed 300kHz PWM Oscillator Allows Effective Noise Filtering
  • 28-Pin SSOP Package Saves Board Space
Additional Details
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The MAX1757 is a switch-mode lithium-ion (Li+) battery charger that charges one to three 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 MAX1757 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 by automatically reducing battery-charging current prevents overload of the input supply, 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 3 by pin strapping. Battery temperature is monitored by an external thermistor to prevent charging outside the acceptable temperature range.

The MAX1757 is available in a space-saving 28-pin SSOP package. Use the MAX1757EVKIT to help reduce design time. For a stand-alone charger with a 28V switch, refer to the MAX1758 data sheet. For a charger controller capable of up to 4A charging current, refer to the MAX1737 data sheet.

Applications

  • Desktop Cradle Chargers
  • Handheld Instruments (PDAs, Palmtops)
  • Li+ Battery Packs
  • Notebook Computers
  • PDAs
Part Models 2
1ku List Price Starting From $9.51

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Documentation

Documentation

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
MAX1757EAI+
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MAX1757EAI+T
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Product Lifecycle

PCN

Mar 13, 2023

- 2361N

WAFER FAB

MAX1757EAI+

PRODUCTION

MAX1757EAI+T

PRODUCTION

Filter by Model

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Part Models

Product Lifecycle

PCN

Mar 13, 2023

- 2361N

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WAFER FAB

MAX1757EAI+

PRODUCTION

MAX1757EAI+T

PRODUCTION

Software & Part Ecosystem

Software & Part Ecosystem

Evaluation Kit

Evaluation Kits 1

MAX1758EVKIT

Evaluation Kit for the MAX1757, MAX1758

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MAX1758EVKIT

Evaluation Kit for the MAX1757, MAX1758

Evaluation Kit for the MAX1757, MAX1758

Features and Benefits

  • Complete Li+ Charging Solution up to 3-Series Cells (MAX1757) and 4-Series Cells (MAX1758)
  • 1.5A Battery-Charging Current
  • Low Heat/High Efficiency
  • 300kHz PWM Operation
  • Up to 14V Input Voltage Range (MAX1757)
  • Up to 28V Input Voltage Range (MAX1758)
  • 28-Pin SSOP Package
  • Surface-Mount Construction
  • Fully Assembled and Tested

Product Detail

The MAX1757/MAX1758 evaluation kits (EV kits) are assembled and tested PC boards that implement a step-down, switching lithium-ion (Li+) battery charger. The MAX1757 EV kit can be set to charge 1- to 3-series cells, and the MAX1758 EV kit can be set to charge 1- to 4-series cells. The cell voltage can be set between 4.0V and 4.4V using standard 1% resistors while maintaining 1% overall regulation voltage accuracy. Three LEDs indicate the charging status.

The MAX1757/MAX1758 EV kits detect faulty cells and terminate charging. Two capacitors are used to set the charge termination, prequalification, and fault timeout periods. A user-supplied thermistor may be connected to either EV kit to monitor battery temperature and suspend charging for over-/undertemperature conditions.

Applications

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

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