Document Number: MC34671 Freescale Semiconductor Rev. 1.0, 01/2008 Advance Information High Input Voltage 600mA 34671 Charger for Single-cell Li-Ion Batteries The MC34671 is a cost-effective fully-integrated battery charger for POWER MANAGEMENT IC Li-Ion or Li-Polymer batteries. The high input voltage, up to 28V, eliminates the input over-voltage-protection circuit required in handheld devices such as cell phones, Bluetooth accessories and MP3 players. A typical charge cycle includes trickle, constant-current (CC) and constant-voltage (CV) charge modes. The CC-mode current is programmable up to 600mA with an external resistor. The voltage across the external resistor is also used to monitor the actual charge EP SUFFIX (PB-FREE) 98ASA10774D current. The constant voltage is fixed at 4.2V with 0.7% accuracy over 8-PIN UDFN a -20C to 70C temperature range. The trickle-mode current is preset to 20% of the CC-mode current when the battery voltage is lower than the trickle-mode threshold. The end-of-charge (EOC) current threshold is preset to 10% of the CC-mode current to save the board space and ORDERING INFORMATION cost. A charge current thermal foldback feature limits the charge current when the IC internal temperature rises to a preset threshold. Temperature Device Package The MC34671 also protects the system with its input over-voltage Range (T ) A protection (OVP) feature. In addition, the MC34671 has a 2.6V falling MC34671AEP/R2 -40C to 85C 8-UDFN power-on-reset (POR) threshold, making it perfect to work with current limited power supplies. Three indication pins (PPR, CHG and FAST) can be simply interfaced to a microprocessor or LEDs. When no power supply is connected, or when disabled, the charger draws less than 1.0A leakage current from the battery. Features No external MOSFET, reverse-blocking diode or current-sense resistor are required Guaranteed maximum 600mA programmable CC-mode current 0.7% voltage accuracy over -20C to 70C 5% current accuracy over -40C to 85C 28V maximum voltage for the power input with 11V over-voltage protection threshold 2.6V minimum input operating voltage Trickle charge for fully discharged batteries Charge current monitor Charge current thermal foldback Pb-free packaging designated by suffix code EP 34671 V IN VIN TO BATTERY BAT C GND IN C OUT ISET R ISET V IO CHG PPR OFF TO MCU ON EN FAST Figure 1. 34671 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.INTERNAL BLOCK DIAGRAM INTERNAL BLOCK DIAGRAM VIN BAT V Internal IN + Supply Monitor V REF Charge Control REF ISET PPR + V OS I REF VIN + + Die Temp BAT + 110C CHG + Logic I EN Control EOC FAST GND Figure 2. 34671 Simplified Internal Block Diagram 34671 Analog Integrated Circuit Device Data 2 Freescale Semiconductor