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34674 Datasheet(PDF) 1 Page - Freescale Semiconductor, Inc |
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34674 Datasheet(HTML) 1 Page - Freescale Semiconductor, Inc |
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1 / 26 page  Document Number: MC34674 Rev. 2.0, 11/2008 Freescale Semiconductor Advance Information 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. High Input Voltage Travel Charger for Single-cell Li-Ion Batteries 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 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- output voltage in the CV-mode is fixed at 4.2 V with 0.4% accuracy over -20°C to 70°C temperature range. The MC34674 has all the 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 also protects the system with its input over-voltage protection (OVP) feature. In addition, it has a 2.6 V falling power-on-reset (POR) threshold, making it perfect to work with current limited power supplies. When the charger is disabled, the BAT pin leaks less than 1.0 μA 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- 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 2X3 mm2 thermally enhanced UDFN package • Pb-free packaging designated by suffix code EP Figure 1. 34674 Simplified Application Diagram POWER MANAGEMENT IC EP SUFFIX (PB-FREE) 98ASA10774D 8-PIN UDFN 34674 ORDERING INFORMATION Device Temperature Range (TA) Package Refer to Table 1, Device Variations -40°C to 85°C 8 UDFN-EP VIN GND RED GRN EN BAT VREF TEMP RPU 34674 RS VIN TO BATTERY TO BATTERY NTC (THERMISTOR) CIN COUT ON OFF |
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