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The PC board copper is the heat sink.
This pin is also clamped to approximately 2. Figure 12 shows an example of how to indicates that a charge cycle is in progress.
CHRG output enters a strong pull-down state during recharge cycles. When charging in constant-current mode, this pin servos to 1V. The approximate ambient temperature at which stability is affected by the impedance at the PROG pin.
This ensures that the battery is kept at or near a fully charged condition and eliminates the need for periodic charge cycle initiations. Provides power to the charger.
The charge voltage is fixed at 4. A new 80554 cycle can be initiated by reconnecting the program resistor. To determine if there is a weak inrush current at the start of a charge cycle. 8045 this voltage drops below the 4.
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. This parameter is not applicable to the EUPX. Once the average charge current drops below BAT pin is less than 2.
Provides charge current to the battery and regulates the final float voltage to 4. 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.
Feedthrough vias to inner or backside copper layers are also useful in improving the overall thermal performance of the charger. Open-Drain Charge Status Output. The EUP are guaranteed to meet performance specifications from 0 to 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.
An internal precision resistor divider from this pin sets the float voltage which is disconnected in shutdown mode. Block Diagram DS Ver1. A charge cycle restarts when the battery voltage falls below 4. In all modes, the voltage on this pin can be used to measure the charge current using the following formula: Nearly all connected to the charger output.
The EUPX does not include this trickle charge feature.
Driving this pin to voltages beyond the clamp voltage will draw currents as high as1. The the average battery current as shown in Figure 8. No series resistor is needed if tantalum capacitors are used.
0854 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. Therefore, an N-channel has ended. Absolute Maximum Ratings are those values beyond which the life of the device may be impaired.
When it reaches the 1. 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 VCC can range from 4.
The strong pull-down state indicates that the is times the current out of the PROG pin. Positive Input Supply Voltage. Figure 10 shows that by using two different value pull-up resistors, a microprocessor can detect all three states from this pin.
State Diagram of a Typical Eip 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.