Design Files
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600 mA Single-Cell Li-Ion / Li-Polymer Battery Charger
The MC34671 is a cost-effective fully integrated battery charger for Li-Ion or Li-Polymer batteries. It tolerates an input voltage up to 28 V, which eliminates the input over-voltage protection circuit required in handheld devices. A charge cycle includes trickle, constant-current (CC) and constant-voltage (CV) charge modes.
The constant-current (CC) is programmable up to 600 mA, with an external resistor.The constant voltage is fixed at 4.2 V. The trickle charge current is preset to 20% of the CC current when the battery voltage is lower than the trickle-charge threshold. The end-of-charge (EOC) current threshold is preset to 10% of the CC current to save 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 MC34671 has a 2.6 V 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 1.0 µA leakage current from the battery.
Freescale MC34671 Product Image
Product Details
Block Diagram
Features
System Features
- No external MOSFET, reverse-blocking diode, or current-sense resistor are required
- Guaranteed maximum 600 mA programmable charge current
- ±0.7% voltage accuracy over -20 °C to 70 °C
- ±5% current accuracy over -40 °C to 85 °C
- 28 V maximum voltage for the power input with 11 V over-voltage protection threshold
- 2.6 V minimum input operating voltage
- Trickle charge for fully discharged batteries
- Charge current monitor
- Charge current thermal foldback
- Single battery cell
- Li-Ion and Li-Polymer battery chargers
- Parallel interface and input control
- Output current 0.6 A
- Output voltage 4.2 V
Part numbers include: MC34671AEP.
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Documentation
Quick reference to our documentation types.
1-5 of 6 documents
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Application Note
AN1902: Assembly Guidelines for QFN and SON Packages Application NoteFeatured
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Data Sheet
MC34671, High Input Voltage 600mA Charger for Single-cell Li-Ion BatteriesFeatured
Design Resources
Hardware
Quick reference to our
board types.
2 hardware offerings
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Evaluation and Development BoardsEvaluation Kit for MC34671 Single-Cell Li-Ion / Li-Poly ChargerFeatured
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Complete SolutionNXP Rapid IoT Prototyping Kit
Engineering Services
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