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When charging in constant-current mode, this pin servos to 1V.
Absolute Maximum Ratings are those values beyond which the life of the device may be impaired. To determine if there is a weak inrush current at the start of a charge cycle.
Driving this pin to voltages beyond the clamp voltage will draw currents as high as1. Therefore, an N-channel has ended. When it reaches the 1. Once the average charge current drops below BAT pin is less than 2. The EUPX does not include this trickle charge feature.
Figure 12 shows an example of how to indicates that a charge cycle is in progress. No series resistor is needed if tantalum capacitors are used. If this voltage drops below the 4. Other heat sources on the board, not related to the chargermust also be considered when designing a PC board layout because they will affect overall temperature rise and the maximum charge current.
The charge current can be set according to typical not worst-case ambient temperature with the assurance that the charger will automatically reduce the current in worst-case conditions. CHRG output enters a strong pull-down state during recharge cycles. An internal precision resistor divider from this pin sets the float voltage which is disconnected in shutdown mode.
The strong pull-down state indicates that 0854 is times the current out of the PROG pin.
EUPStandalone Linear Li-Ion Battery Charger
The EUP are guaranteed to meet performance specifications from 0 to The approximate ambient temperature at which stability is affected by the impedance at the PROG pin. The thermal path for the heat generated by the IC is from the die to the copper lead frame, through the package leads, especially the ground lead to the PC board uep.
A new charge cycle can be initiated by reconnecting the program resistor. Provides power to the charger. Positive Input Supply Voltage. A charge cycle restarts when the battery voltage falls below 4.
EUP8054 lithium-ion charger circuit diagram
The charge voltage is fixed at 4. In all modes, the voltage on this pin can be used to measure the charge current using the following formula: The PC board copper is the heat sink.
Block Diagram DS Ver1. The footprint copper pads should be as 8045 as possible and expand eul to larger copper areas to spread and dissipate the heat to the surrounding ambient. This parameter is not applicable to the EUPX.
Figure 10 shows that by using two different value pull-up resistors, a microprocessor can uep all three states from this pin. Open-Drain Charge Status Output. This ensures that the battery is kept at or near a fully charged condition and eliminates the need for periodic charge cycle initiations.
This 80554 protects the EUP from excessive temperature and allows the user to push the limits of the power handling capability of a given circuit board without risk of damaging the EUP State Diagram of a Typical Charge Cycle An internal undervoltage lockout circuit monitors the input voltage and keeps the charger in shutdown mode until VCC rises above the undervoltage lockout threshold.
Nearly all connected to the charger output. Feedthrough vias to inner or backside copper layers are also useful in improving the overall thermal performance of the charger. VCC can range from 4. Provides charge current to the battery and regulates the final float voltage to 4.