Document Number: MC34675 Freescale Semiconductor Rev. 3.0, 4/2008 Advance Information 28V-Input-Voltage Single-Cell 34675 Li-Ion Battery Charger with 10mA Regulator The 34675 is a high-input-voltage Li-Ion battery charger with a POWER MANAGEMENT IC 4.85V/10mA linear regulator. 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 portable media players. The 4.85V linear regulator is capable of 10mA output current and can be used to directly power a sub-system such as a USB transceiver. The charge cycle of the 34675 includes trickle, constant-current (CC) and constant-voltage (CV) charge modes. The CC mode current EP SUFFIX (PB-FREE) is programmable up to 1A, with an external resistor. The voltage across 98ASA10774D the external resistor is also used to monitor the actual charge current. 8-PIN UDFN The constant voltage is fixed at 4.2V with 0.7% accuracy over the -40C to 85C temperature range. The trickle-mode current is pre-set to 20% of the CC mode current when the battery voltage is lower than ORDERING INFORMATION the trickle-mode threshold. The end-of-charge (EOC) current threshold is pre-set to 10% of the CC mode current, to save board space and Temperature Device Package cost. A charge current thermal foldback feature limits the charge Range (T ) A current when the IC internal temperature rises to the preset threshold MC34675AEP/R2 -40C to 85C 8-UDFN of 120C. The 34675 also protects the system with its input over- voltage protection (OVP) feature. Two indication pins (PPR and CHG) 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 is required Guaranteed maximum 1A programmable CC mode current 0.7% voltage accuracy over -40C to 85C 6% current accuracy over -40C to 85C 4.85V/10mA linear regulator with a 6.8V input over-voltage protection threshold 28V maximum voltage for the power input with a 6.8V over-voltage protection threshold Trickle charge for fully discharged batteries Charge current monitor Charge current thermal foldback Pb-free packaging designated by suffix code EP 34675 V IN VIN TO BATTERY BAT C GND IN C OUT ISET R ISET CHG PPR TO SYSTEM DET OFF C DET EN ON Figure 1. 34675 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., 2008. All rights reserved.INTERNAL BLOCK DIAGRAM INTERNAL BLOCK DIAGRAM VIN BAT VIN Monitor + Internal V REF Supply Charge Linear Control Reg ISET REF DET + V OS I REF VIN + + PPR Die Temp BAT + 120C CHG Logic + EN Control I EOC GND Figure 2. 34675 Simplified Internal Block Diagram 34675 Analog Integrated Circuit Device Data 2 Freescale Semiconductor