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MC34673| Datasheet

By datasheet - July 8th, 2008

MC34673| Datasheet

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Freescale Semiconductor Advance Information

Document Number: MC34673 Rev. 1.0, 01/2008

High Input Voltage 1.2A Charger for Single-cell Li-Ion Batteries
The MC34673 is a cost-effective fully-integrated battery charger for 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 PDAs, cell phones, portable video game players and digital still cameras. A typical charge cycle includes trickle, constant-current (CC) and constant-voltage (CV) charge modes. The CC-mode current is programmable up to 1.2A with an external resistor. The voltage across the external resistor is also used to monitor the actual charge current. The constant voltage is fixed at 4.2V with 0.7% accuracy over a -20 C to 70 C 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 cost. A charge current thermal foldback feature limits the charge current when the IC internal temperature rises to
a preset threshold. The MC34673 also protects the system with its input over-voltage protection (OVP) feature. In addition, the MC34673 has a 2.6V falling 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 1.0uA leakage current from the battery.

34673
POWER MANAGEMENT IC

EP SUFFIX (PB-FREE) 98ASA10774D 8-PIN UDFN

ORDERING INFORMATION
Device MC34673AEP/R2 Temperature Range (TA) -40 C to 85 C Package 8-UDFN

Features No external MOSFET, reverse-blocking diode or current-sense resistor are required Guaranteed maximum 1.2A programmable CC-mode current 0.7% voltage accuracy over -20 C to 70 C 6% current accuracy over -40 C to 85 C 28V maximum voltage for the power input with 6.8V 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

VIN CIN

34673
VIN GND BAT COUT ISET TO BATTERY

CHG
OFF ON

RISET

PPR EN FAST

VIO TO MCU

Figure 1. 34673 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.


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