KIT34674EPEVBE【PDF 1/26 页】KIT EVAL BOARD 10CH LED BACKLGHT

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Freescale Semiconductor

Advance Information

High Input Voltage Travel

Charger for Single-cell Li-Ion

Batteries

The MC34674 is a fully integrated single-cell Li-Ion and Li-Polymer

battery charger optimized for travel charger applications. The few

external components required include a dual-color LED for charge-

status indication, a negative temperature coefficient (NTC) thermistor

circuit for setting the charge temperature window, and two decoupling

capacitors. The high input voltage, up to 28 V, allows low-cost AC/DC

converters to be used for further system cost reduction. A typical

charge cycle of the MC34674 includes trickle, constant-current (CC)

and constant-voltage (CV) charge modes. The CC-mode current is

selectable from 50 mA to 1.05 A with 8% accuracy and the constant-

output voltage in the CV-mode is fixed at 4.2 V with 0.4% accuracy over

-20°C to 70°C temperature range.

The MC34674 has all the features such as trickle charging for a

deeply discharged battery, an internal timer for termination to prevent

charging a failed battery, charger current thermal foldback for thermal

Document Number: MC34674

Rev. 2.0, 11/2008

34674

POWER MANAGEMENT IC

EP SUFFIX (PB-FREE)

98ASA10774D

8-PIN UDFN

ORDERING INFORMATION

protection, and smart battery connection verification to prevent

charging in case there is no battery connected. It also protects the

system with its input over-voltage protection (OVP) feature. In addition,

it has a 2.6 V falling power-on-reset (POR) threshold, making it perfect

to work with current limited power supplies. When the charger is

Device

Refer to Table 1,

Device Variations

Temperature

Range (T A )

-40°C to 85°C

Package

8 UDFN-EP

disabled, the BAT pin leaks less than 1.0 μ A current from the battery.

All the above functions are fit into a small 8-lead 2X3 UDFN package.

Features

? No external MOSFET, reverse-blocking diode or current-

sense resistor are required

? 28 V maximum input voltage rating with 11 V over-voltage

protection threshold

? Factory programmable charge current

? Trickle charge for fully discharged batteries

? ± 0.4% voltage accuracy over -20°C to 70°C

? Driving a dual-color LED and smart battery connection

verification optimized for travel charger applications

? Interface to NTC thermistor

? Internal timer and thermal current limit

? Small 2X3 mm 2 thermally enhanced UDFN package

? Pb-free packaging designated by suffix code EP

V IN

34674

C IN

VIN

BAT

R PU

C OUT

TO BATTERY

VREF

RED

TEMP

R S

OFF

GRN

GND

TO BATTERY NTC

(THERMISTOR)

Figure 1. 34674 Simplified Application Diagram

This document contains certain information on a new product.

Specifications and information herein are subject to change without notice.

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