Document Number: MC34674 Freescale Semiconductor Rev. 2.0, 11/2008 Advance Information High Input Voltage Travel 34674 Charger for Single-cell Li-Ion Batteries The MC34674 is a fully integrated single-cell Li-Ion and Li-Polymer POWER MANAGEMENT IC 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 high input voltage, up to 28 V, allows low-cost AC/DC converters to be used for further system cost reduction. A typical 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 8% accuracy and the constant- EP SUFFIX (PB-FREE) 98ASA10774D output voltage in the CV-mode is fixed at 4.2 V with 0.4% accuracy over 8-PIN UDFN -20C to 70C temperature range. The MC34674 has all the features such as trickle charging for a deeply discharged battery, an internal timer for termination to prevent ORDERING INFORMATION charging a failed battery, charger current thermal foldback for thermal protection, and smart battery connection verification to prevent Temperature Device Package charging in case there is no battery connected. It also protects the Range (T ) A system with its input over-voltage protection (OVP) feature. In addition, Refer to Table 1, -40C to 85C 8 UDFN-EP it has a 2.6 V falling power-on-reset (POR) threshold, making it perfect Device Variations to work with current limited power supplies. When the charger is disabled, the BAT pin leaks less than 1.0 A current from the battery. All the above functions are fit into a small 8-lead 2X3 UDFN package. Features No external MOSFET, reverse-blocking diode or current- Driving a dual-color LED and smart battery connection sense resistor are required verification optimized for travel charger applications 28 V maximum input voltage rating with 11 V over-voltage Interface to NTC thermistor protection threshold Internal timer and thermal current limit 2 Factory programmable charge current Small 2X3 mm thermally enhanced UDFN package Trickle charge for fully discharged batteries Pb-free packaging designated by suffix code EP 0.4% voltage accuracy over -20C to 70C 34674 V IN VIN BAT TO BATTERY C C OUT IN R PU VREF TEMP RED R S GRN TO BATTERY NTC OFF (THERMISTOR) EN GND ON Figure 1. 34674 Simplified Application Diagram This document contains certain information on a new product. Specifications and information herein are subject to change without notice. Freescale Semiconductor, Inc., 2007-8. All rights reserved.DEVICE VARIATIONS DEVICE VARIATIONS Table 1. Device Variations (1) Freescale Part No. CC-Mode Current (I ) Reference Location CHG MC34674AEP/R2 1.05A Table 6 MC34674BEP/R2 850mA Table 6 MC34674CEP/R2 650mA Table 6 MC34674DEP/R2 450mA Table 6 Notes 1. Freescale offers a series of MC34674 variations. Each variation has an increment of 50 mA or 100 mA for the CC-mode current. 34674 Analog Integrated Circuit Device Data 2 Freescale Semiconductor