MC34676 Datasheet, PDF (1/27 Pages) Freescale Semiconductor, Inc – Dual 28 V Input Voltage Charger with Linear Regulator

Freescale Semiconductor
Advance Information
Document Number: MC34676
Rev. 1.0, 10/2008
Dual 28 V Input Voltage Charger
with Linear Regulator
34676
The 34676 is a dual 28 V input voltage and fully-integrated single
cell Li-Ion battery charger, targeting smart handheld applications. One
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
programmable, up to 1.2 A and 400 mA, with an external resistor
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
an external resistor. The 4.85 V regulator can be used to power a sub-
system directly.
The 34676 has a 5% constant current accuracy for the AC Charger
over -40 to 85^oC, and a 1.0% constant voltage accuracy over -40 to
85^oC. A charge current thermal foldback feature, limits the charge
current when the IC internal temperature rises to a preset threshold.
BATTERY CHARGER
EP SUFFIX (PB-FREE)
98ASA10814D
12-PIN µDFN
ORDERING INFORMATION
Device
Temperature
Range (T_A)
Package
MC34676BEP/R2 -40°C to 85°C
12-UDFN
Features
• ±1.0% voltage accuracy over -45 to 85°C
• No external MOSFET, reverse blocking diode, or
current sense resistor are required
• Additional voltage regulated output powered by USB
input
• Battery detection input
• Charge current monitor with thermal limits
• Integrated input over-voltage protection
• Pb-free packaging designated by suffix code EP
Applications
• Cell Phone
• Smart Phone
• PDA, PMP, PND,
• Handheld Portable Devices
• Portable Medical Devices
34676B
AC
USB
C1
C2
GND
BAT
BATDET
USBOUT
C₃
C₄
IMIN
PPR
IUSB ISET USBEN ^CHG
VDDIO
R_IMIN R_IUSB R_ISET
USB
AC
Figure 1. 34676B Simplified Application Diagram
MCU
* 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.