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An internal precision resistor divider from this pin sets the float voltage which is disconnected in shutdown mode. Figure 12 shows an example of how to indicates that a charge cycle is in progress.
This pin is also clamped to approximately 2. The strong pull-down state indicates that the is times the current out of the Fup 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 copper. The PC board copper is the heat sink. The the average battery current as shown in Figure 8.
Once the average charge current drops below BAT pin is less than 2. When it reaches the 1. Positive Input Supply Voltage. The EUPX does not dup this trickle charge feature.
EUPStandalone Linear Li-Ion Battery Charger
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. VCC can range from 4. Therefore, an N-channel has ended. The footprint copper pads should be as wide as possible and expand out to larger copper areas to spread and dissipate the heat to the surrounding ambient.
Driving this pin to voltages beyond the clamp voltage will draw currents as high as1. A new charge cycle can be initiated by reconnecting the program resistor. In all modes, the voltage on this pin can be used to measure the charge current using the following formula: This feature 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 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 804.
Nearly all connected to the charger output. The charge voltage is fixed at 4.
Standalone Linear Li-Ion Battery Charger With Thermal Regulation In ThinSOT
Absolute Maximum Ratings are those values beyond which the life of the device may be impaired. 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.
No series resistor is needed if tantalum capacitors are used. Provides charge current to the battery and regulates the final float voltage to 4.
A charge cycle restarts when the battery voltage falls below 4. When charging in constant-current mode, this pin servos to 1V. This ensures that the battery is kept 804 or near a fully charged condition and eliminates the need for periodic charge cycle initiations. If this voltage drops below the 4. CHRG output enters a strong pull-down state during recharge cycles.
The EUP are guaranteed to meet performance specifications from 0 to To determine if there is a weak 80554 current at the start of a charge cycle. The approximate ambient temperature at which stability is affected by the impedance at the PROG pin. This parameter is not applicable to the EUPX. Block Diagram DS Ver1. Open-Drain Charge Status Output.
Feedthrough vias to inner or backside copper layers are also useful in improving the overall thermal performance of the charger. Figure 10 shows that by using two different value pull-up resistors, a microprocessor can detect all three states from this pin.
Provides power to the charger.