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Freescale Semiconductor Electronic Components Datasheet



MC34671

High Input Voltage 600mA Charger



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MC34671 pdf
www.DFatraSeheesetc4Ua.lceomSemiconductor
Advance Information
Document Number: MC34671
Rev. 1.0, 01/2008
High Input Voltage 600mA
Charger for Single-cell Li-Ion
Batteries
34671
The MC34671 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 cell phones, Bluetooth accessories and MP3
players.
POWER MANAGEMENT IC
A typical charge cycle includes trickle, constant-current (CC) and
constant-voltage (CV) charge modes. The CC-mode current is
programmable up to 600mA 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
EP SUFFIX (PB-FREE)
98ASA10774D
a -20°C to 70°C temperature range. The trickle-mode current is preset
8-PIN UDFN
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
ORDERING INFORMATION
current when the IC internal temperature rises to a preset threshold.
The MC34671 also protects the system with its input over-voltage
protection (OVP) feature. In addition, the MC34671 has a 2.6V falling
power-on-reset (POR) threshold, making it perfect to work with current
Device
MC34671AEP/R2
Temperature
Range (TA)
-40°C to 85°C
Package
8-UDFN
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 1.0µA leakage current from the battery.
Features
• No external MOSFET, reverse-blocking diode or current-sense resistor are required
• Guaranteed maximum 600mA programmable CC-mode current
±0.7% voltage accuracy over -20°C to 70°C
±5% current accuracy over -40°C to 85°C
• 28V maximum voltage for the power input with 11V 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
34671
VIN
CIN GND
BAT
COUT
TO BATTERY
OFF
ON
CHG
PPR
EN
ISET
FAST
RISET
VIO
TO MCU
Figure 1. 34671 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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MC34671 pdf
www.DaItNaTSEhReeNtA4UL .BcoLmOCK DIAGRAM
INTERNAL BLOCK DIAGRAM
VIN BAT
PPR
VIN
Monitor
Internal
Supply
REF
VOS
VIN
+– +
BAT
Charge
Control
CHG
EN
Logic
Control
+
VREF
+
IREF
Die
Temp
+ 110°C
+
IEOC
ISET
FAST
GND
Figure 2. 34671 Simplified Internal Block Diagram
34671
2
Analog Integrated Circuit Device Data
Freescale Semiconductor



Part Number MC34671
Description High Input Voltage 600mA Charger
Maker Freescale Semiconductor - Freescale Semiconductor
Total Page 22 Pages
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