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LTC4267IGN-1-TRPBF Datasheet(PDF) 10 Page - Linear Technology |
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LTC4267IGN-1-TRPBF Datasheet(HTML) 10 Page - Linear Technology |
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10 / 32 page  LTC4267-1 10 42671f avoid corrupting the 25k signature resistor while also sav- ing board space and cost. In addition, the inrush current limit requirement of the IEEE 802.3af standard can cause large transient power dissipation in the PD. The LTC4267-1 is designed to allow multiple turn-on sequences without overheating the miniature 16-lead package. In the event of excessive power cycling, the LTC4267-1 provides thermal overload protection to keep the onboard power MOSFET within its safe operating area. OPERATION The LTC4267-1 PD interface has several modes of opera- tion depending on the applied input voltage as shown in Figure 1 and summarized in Table 1. These modes satisfy the requirements defined in the IEEE 802.3af specification. The input voltage is applied to the VPORTN pin and must be negative relative to the VPORTP pin. Voltages in the data sheet for the PD interface portion of the LTC4267-1 are with respect to VPORTP while the voltages for the switch- ing regulator are referenced to PGND. It is assumed that PGND is tied to POUT. Note the use of different ground symbols throughout the data sheet. Table 1. LTC4267-1 Operational Mode as a Function of Input Voltage INPUT VOLTAGE (VPORTN with RESPECT to VPORTP) LTC4267-1 MODE OF OPERATION 0V to – 1.4V Inactive –1.5V to –9.5V** 25k Signature Resistor Detection –9.8V to –12.4V Classification Load Current Ramps up from 0% to 100% –12.5V to UVLO* Classification Load Current Active UVLO* to –57V Power Applied to Switching Regulator *VPORTN UVLO includes hysteresis. Rising input threshold ≅ –36.0V Falling input threshold ≅ –30.5V **Measured at LTC4267-1 pin. The LTC4267-1 meets the IEEE 802.3af 10V minimum when operating with the required diode bridges. APPLICATIO S I FOR ATIO Figure 1. Output Voltage, ⎯P⎯W⎯R⎯G⎯D and PD Current as a Function of Input Voltage |
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