Single-Cell Li-Ion/Li-Polymer Battery Travel Charger

MC34674
  • Archived
  • This page contains information on a product that is no longer manufactured (discontinued). Specifications and information herein are available for historical reference only.

The MC34674 is a fully integrated single-cell Li-Ion and Li-Polymer battery charger optimized for travel charger applications. The few external components required include a dual-color LED for charge-status indication, a negative-temperature-coefficient (NTC) thermistor circuit for setting the charge temperature window and two decoupling capacitors.

The MC34674 tolerates an input voltage up to 28 V, which allows low-cost ac/dc converters to be used for further system-cost reduction. A charge cycle of the MC34674 includes trickle, constant-current (CC) and constant-voltage (CV) charge modes. The CC-mode current is selectable from 50 mA to 1.05 A, with 10% accuracy and the constant-output voltage in the CV-mode is fixed at 4.2 V.

The MC34674 has many features such as trickle charging for a deeply-discharged battery, an internal timer for termination to prevent charging a failed battery, charger current thermal foldback for thermal protection and smart battery-connection verification to prevent charging in case there is no battery connected. It has a 2.6 V falling power-on-reset (POR) threshold, making it ideal to work with current-limited power supplies. When the charger is disabled, the BAT pin leaks less than 1 µA current from the battery.

See product image

Product Details

Block Diagram

Freescale MC34674 Battery Management Block Diagram

NXP<sup>&#174;</sup> MC34674 Battery Management Block Diagram
Get diagram PDF

Features

  • No external MOSFET, reverse-blocking diode or current-sense resistor are required
  • 28 V maximum input voltage rating with 11 V over-voltage-protection threshold
  • Factory programmable charge current
  • Trickle charge for fully discharged batteries
  • ±0.4% voltage accuracy over -20 °C to 70 °C
  • Driving a dual-color LED and smart battery-connection verification optimized for travel charger applications
  • Interface to NTC thermistor
  • Internal timer and thermal current limit
  • Small 8-lead 2X3 mm thermally enhanced UDFN package

Part numbers include: MC34674AEP, MC34674BEP, MC34674CEP, MC34674DEP.

Documentation

Quick reference to our documentation types.

Filters

1-5 of 6 documents

Show All

Support

What do you need help with?

Search