Document Number: MC34676 Freescale Semiconductor Rev. 1.0, 10/2008 Advance Information Dual 28 V Input Voltage Charger 34676 with Linear Regulator The 34676 is a dual 28 V input voltage and fully-integrated single cell Li-Ion battery charger, targeting smart handheld applications. One BATTERY CHARGER of the inputs is optimized for charging with a USB port, and the second is optimized for an AC/DC adapter power source. The charger has two 28 V power devices, to eliminate the need of any external power source selection and input over-voltage protection circuitry. Each of the power devices independently controls the charge current from the input, and performs as an independent charger. Only one of the two chargers operate at a time. The AC charger current and the USB charger current are EP SUFFIX (PB-FREE) 98ASA10814D programmable, up to 1.2 A and 400 mA, with an external resistor 12-PIN DFN respectively. The voltage across the two external resistors is also used to monitor the actual charge current through each charger respectively. The EOC current of both chargers is the same, and programmable by ORDERING INFORMATION an external resistor. The 4.85 V regulator can be used to power a sub- Temperature system directly. Device Package Range (T ) A The 34676 has a 5% constant current accuracy for the AC Charger o MC34676BEP/R2 -40C to 85C 12-UDFN over -40 to 85 C, and a 1.0% constant voltage accuracy over -40 to o 85 C. A charge current thermal foldback feature, limits the charge current when the IC internal temperature rises to a preset threshold. Features Applications 1.0% voltage accuracy over -45 to 85C Cell Phone No external MOSFET, reverse blocking diode, or Smart Phone current sense resistor are required PDA, PMP, PND, Additional voltage regulated output powered by USB Handheld Portable Devices input Portable Medical Devices Battery detection input Charge current monitor with thermal limits Integrated input over-voltage protection Pb-free packaging designated by suffix code EP 34676B AC BAT BATDET USB C1 C2 USBOUT C 4 GND C 3 VDDIO IMIN PPR CHG USBEN IUSB ISET MCU R R R IMIN IUSB ISET USB AC Figure 1. 34676B 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. ARCHIVE INFORMATION ARCHIVE INFORMATIONINTERNAL BLOCK DIAGRAM INTERNAL BLOCK DIAGRAM USBOUT AC BAT USB V V USB AC Mon Mon Analog Control V V V BAT V USB AC BAT VREF Temp Sense V V OS OS V BAT TKL V TKL PPR V BAT RCH V RCH Logic CHG V EOC EOC I /K BAT 1.75 V OSC I BATDET USBEN BATDET IMIN ISET IUSB GND Figure 2. 34676 Simplified Internal Block Diagram 34676 Analog Integrated Circuit Device Data 2 Freescale Semiconductor ARCHIVE INFORMATION ARCHIVE INFORMATION