MC34673: 1.2A 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 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.
NXP® MC34673 Battery Management Block Diagram
NXP® MC34673 Product Image
特性
- 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
Recommended Documentation (3)
Data Sheets (1)
Application Notes (2)
Users Guides (1)
Fact Sheets (1)
Brochures (1)
| Name/Description | Modified Date |
|---|
| Medical Brochure (REV 3) PDF (254.7 kB) BRMEDICAL | 12 Sep 2012 |
Reference Applications
Ordering Information
| Product | Status | Device Function | Budgetary Price excluding tax(US$) | Package Type and Termination Count | Num. of Linear/LDO Regulators | Output Voltage | Output Current (A) | Battery Charger | Number of Battery Cells | Charge Termination Method | Charge Current Type | Supply Voltage (Min-Max) (V) | Interface and Input Control | Ambient Operating Temperature (Min-Max) (°C) | Protection | Additional Features - Power Management | Pin count | Input Voltage (Max) (V) | RoHS |
|---|
| MC34673AEPR2 | Active | Battery Chargers | 1K @ US$0.44 | DFN-EP 8 | | 4.2 | 1.2 | Li-Polymer, Li-Ion | 1 | End of Charge (EOC), MCU control, Over Voltage (OVP) | Tickle Charge Current, Constant Charge Current | 4.3 to 6.6 | Parallel | -40 to 85 | Die Temperature Current Limit, Battery Thermal Regulation, Overvoltage Protect | AC Supply Voltage, End of Charge Termination, Overvoltage Charge Termination | 8 | 28 | [object Object] |
Package Information
| Package Description | Outline Version | Packing | Product Status | Part Number | Chemical Content | RoHS / Pb FreeChina RoHS Lookup | MSL | PPT (°C) |
|---|
| QFN-D 8 EP 2*3*0.65P0.5 | 98ASA10774D | MPQ - 3000 REELPOQ - 3000 BOX | Active | MC34673AEPR2 | MC34673AEPR2.pdf |   | 1 | 260 |
