MC34673AEPR2 Integrated Circuit Chip High Input Voltage 1.2A Charger for Single-cell Li-Ion Batteries

34673 POWER MANAGEMENT IC

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 1.0µA leakage current from the battery.

EP SUFFIX (PB-FREE)

98ASA10774D

8-PIN UDFN

ORDERING INFORMATION

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

34673 Simplified Application Diagram

Maximum Ratings

All voltages are with respect to ground unless otherwise noted. Exceeding these ratings may cause a malfunction or permanent damage to the device.

Notes

1. ESD testing is performed in accordance with the Human Body Model (HBM) (C_ZAP = 100pF, R_ZAP = 1500Ω), and the Machine Model (MM) (C_ZAP = 200pF, R_ZAP = 0Ω).

2. Device mounted on the Freescale EVB test board per JEDEC DESD51-2.

3. Pin soldering temperature limit is for 10 seconds maximum duration. Not designed for immersion soldering. Exceeding these limits may cause malfunction or permanent damage to the device.

4. Freescale’s Package Reflow capability meets Pb-free requirements for JEDEC standard J-STD-020C. For Peak Package Reflow Temperature and Moisture Sensitivity Levels (MSL), Go to www.freescale.com, search by part number [e.g. remove prefixes/suffixes and enter the core ID to view all orderable parts. (i.e. MC33xxxD enter 33xxx), and review parametrics.

INTERNAL BLOCK DIAGRAM

PIN CONNECTIONS

PACKAGE DIMENSIONS

EP SUFFIX

8-PIN

98ASA10774D

REVISION 0

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