Design Files
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1.2 A Single-Cell Li-Ion / Li-Polymer Battery Charger
The MC34673 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 CC-mode current is programmable up to 1.2 A with an external resistor. The constant voltage is fixed at 4.2 V. The trickle-mode current is pre-set 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 pre-set 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 pre-set threshold.
The MC34673 has a 2.6 V falling power-on-reset (POR) threshold, making it ideal 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 MC34673 Product Image
Product Details
Block Diagram
Features
System Features
- No external MOSFET, reverse-blocking diode or current-sense resistor are required
- Guaranteed maximum 1.2 A programmable CC-mode current
- ±0.7% voltage accuracy over -20 °C to 70 °C
- ±6% current accuracy over -40 °C to 85 °C
- 28 V maximum voltage for the power input with 6.8 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 1.2 A
- Output voltage 4.2 V
Buy/Parametrics
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Documentation
Quick reference to our documentation types.
1-5 of 7 documents
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Application Note
AN1902: Assembly Guidelines for QFN and SON Packages Application NoteFeatured
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Data Sheet
MC34673, High Input Voltage 1.2A Charger for Single-cell Li-Ion BatteriesFeatured
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Application Note
DRM125, Activity Monitor Design Reference Manual - Application Notes
Design Resources
Hardware
Quick reference to our
board types.
4 hardware offerings
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Evaluation and Development BoardsEvaluation Kit - 34673, Single-Cell Li-Ion/Li-Poly ChargerFeatured
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Evaluation and Development BoardsFlexis JM Badge Board
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Reference DesignKL46Z Magnetic Rotary Encoder Reference Design
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Additional hardware available. View our featured partner solutions.
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Reference DesignSub-µA Current Sensor
Engineering Services
To get further assistance directly from NXP, please see our Engineering Services.
4 engineering services
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Independent Design House (IDH)
Hardware Design Services
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Independent Design House (IDH)
Hardware/Software Engineering Services
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Original Design Manufacturer (ODM)
Hardware and Software Engineering Services
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Independent Design House (IDH)
Embedded Software Design
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