ME4054B-N General Description:
ME4054B-N is a complete constant-current/constant voltage linear charger for single cell lithium-ion batteries. Furthermore the ME4054B-N is specifically designed to work within USB power specifications.
No external sense resistor is needed and no blocking diode is required due to the internal PMOSFET architecture .Thermal feedback regulates the charge current to limit the die temperature during high power operation or high ambient temperature. The charge voltage is fixed at 4.2V,and the charge current can be programmed externally with a single resistor. The ME4054B-N automatically terminates the charge cycle when the charge current drops to 1/10th the programmed value after the final float voltage is reached.
When the input supply (wall adapter or USB supply) is removed the ME4054B-N automatically enters a low current state dropping the battery drain current to less than 2μA.The ME4054B-N can be put into shutdown mode reducing the supply current to 55μA.
Other features include charge current monitor, under voltage lockout, automatic recharge and a status.
ME4054B-N Features：
programmable charge current：20-500mA
charge termination：3C/10 charge termination
No MOSFET sense resistor or blocking diode required
Complete Linear Charger in ThinSOT Package for Single Cell Lithium-Ion Batteries
Constant-Current/Constant-Voltage operation with thermal regulation to maximize Rate Without risk of overheating.
Preset 4.2V charge voltage with ±1% accuracy
Automatic Recharge
55μA supply current in shutdown
2.9V trickle current charge threshold
Soft-Start limits inrush current
Charge Status Output Pin
ME4054B-N Typical Application：
Cellular Telephones, PDAs, MP3 Players
Charging Docks and Cradles
Bluetooth Applications
ME4054B-N Package：
5-pin SOT23-5
ME4054B-N Typical Application Circuit：
ME4054B-N Selection Guide：
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product series
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Stable Output voltage
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Programmable charge current range |
Charging terminated
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ME4054BM5G-N
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VFLOAT =4.2V
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20-500mA
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3C/10
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ME4054B-N Pin Configuration：
ME4054B-N Block Diagram：
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