General Description
The MX4054 is a complete constant-current/constant- voltage linear charger for single cell lithium-ion batteries. Its ThinSOT package and low external component count make the MX4054 ideally suited for portable applications. Furthermore, the MX4054 is specifically designed to work within USB power specifications.
No external n resistor is needed, and no blocking diode is required due to the internal MOSFET 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 MX4054 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 MX4054 automatically ent e rs a low current state, dropping the battery drain current to less than 2µA. The MX4054 can be put into shut d own mode, reducing he supply current to 25µA.Other features include charge current monitor, undervoltage lockout, automatic recharge and a status pin to indicate charge termination and the prence of an input voltage.
Ordering Information
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Package B5:SOT23-5
Features
Programmable Charge Current Up to 800mA No MOSFET, Sen 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 Charge Rate Without Risk of Overheating
Charges Single Cell Li-Ion Batteries Directly
from USB Port
Pret 4.2V Charge Voltage with ± 1% Accuracy Charge Current Monitor Output for Gas
Gauging
Automatic Recharge
Soft-Start Limits Inrush Current
Available in 5-Lead SOT-23 Package 2.9V Trickle Charge Threshold C/10 Charge Termination
25mA Supply Current in Shutdown 2.9V Trickle Charge Threshold
Applications
Portable Media Players/MP3 players Cellular and Smart mobile phone Charging Docks and Cradles Bluetooth Applications
Marking Information
Plea e website.
F:PB-Free MX4054
Standalone Linear Li-Ion Battery Charger
With Thermal Regulation in ThinSOT
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Typical Application Circuit鲜花怎么保鲜
MX4054
MX4054
MX4054
MX4054
MX4054
干法除尘
Functional Pin Description
invationPIN
DESCRIPTION
CHRG 1 Open-Drain Status Output
GND 2
Ground
BAT 3 Charge Current Output VCC
4
Positive Input Supply Voltage
PROG 5
Charge Current Program, Charge Current Monitor and
Shutdown Pin.
Pin Functions
CHRG (PIN 1):
Open-Drain Charge Status Output. When the battery is charging, the CHRG pin is pulled low by an internal N-channel MOSFET. When the charge cycle is completed, a weak pull-down of approximately 12µA is connected to the CHRG pin, indicating a “AC prent” condition. When the MX4054 detects an undervoltage lockout condition, CHRG is forced high impedance.
GND (PIN 2): Ground. BAT (PIN 3):
Charge Current Output. Provides charge current to the battery and regulates the final float voltage to 4.2V. An internal precision resistor divider from this pin ts the float voltage which is disconnected in shutdown mode. VCC (PIN 4): Positive Input Supply Voltage. Provides power to the charger. V CC can range from 4.35V to 6.5V and should be bypasd with at least a 1µF capacitor. When V CC drops to within 30mV of the BAT pin voltage, the MX4054 enters shutdown mode, dropping IBAT to less than 2µA.
PROG (PIN 5): Charge Current Program, Charge Current Monitor and Shutdown Pin. The charge current is programmed by connecting a 1% resistor, R PROG , to ground. When charging in constant-current mode, this pin rvos to 1V. In all modes, the voltage on this pin can be ud to measure the charge current using the following formula:
The PROG pin can also be ud to shutdown the charger. Disconnecting the program resistor from ground allows a 3µA current to pull the PROG pin high. When it reaches the 1.94V shutdown threshold voltage, the charger enters shutdown mode, charging stops and the input supply current drops to 25µA. This pin is also clamped to approximately 2.4V. Driving this pin to voltages beyond the clamp voltage will draw currents as high as1.5mA. Reconnecting R PROG to ground will return the charger to normal operation.
MX4054TSOT-23-5
MX4054
Function Block Diagram
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Absolute Maximum Ratings
儿童日记
Electrical Characteristics (Over 0C ≤TJ ≤125°C and recommended supply voltage)
Note 1: Absolute Maximum Ratings are tho values beyond which the life of the device may be impaired.
Note 2: The MX4054 are guaranteed to meet performance specifications from 0℃ to 70℃. Specifications over the -40℃ to 85℃ operating temperature range are assured by design, characterization and correlation with statistical process controls.
Note 3: See Thermal Considerations.
满天星的养殖方法和注意事项
Note 4: Supply current includes PROG pin current (approximately 100µA) but does not include any current delivered to the battery through the BAT pin (approximately 100mA).
Note 5: This parameter is not applicable to the MX4054.
Note 6: I TERM is expresd as a fraction of measured full charge current with indicated PROG resistor.
