 |
Electronic Components Datasheet Search |
|
|
Electronic Components Datasheet Search |
|
LTC4263IDE-1-TRPBF Datasheet(PDF) 8 Page - Linear Technology |
|
||||||||||||||||||||||||||||||
LTC4263IDE-1-TRPBF Datasheet(HTML) 8 Page - Linear Technology |
|
|
8 / 20 page  LTC4263-1 8 42631fa PIN FUNCTIONS LED (Pin 1): Port State LED Drive. This pin is an open- drain output that pulls down when the port is powered. Under port fault conditions, the LED will flash in patterns to indicate the nature of the port fault. See the Applications Information section for a description of these patterns. When the LTC4263-1 is operated from a single 48V sup- ply, this pin is pulsed low with a 6% duty cycle during the periods when the LED should be on. This allows use of a simple inductor, diode, and resistor circuit to avoid excess heating due to the large voltage drop from VDD48. See the Applications Information section for details on this circuit. LEGACY (Pin 2): Legacy Detect. This pin controls whether legacy detect is enabled. If held at VDD5, legacy detect is enabled and testing for a large capacitor is performed to detect the presence of a legacy PD on the port. See the Applications Information section for descriptions of legacy PDs that can be detected. If held at VSS, only IEEE 802.3af compliant PDs are detected. If left floating, the LTC4263-1 enters force-power-on mode and any PD that generates between 1V and 10V when biased with 270μA of detection current will be powered as a legacy device. This mode is useful if the system uses a differential detection scheme to detect legacy devices. MIDSPAN (Pin 3): Midspan Enable. If this pin is connected to VDD5, Midspan backoff is enabled and a 3.2 second delay occurs after every failed detect cycle unless the result is open circuit. If held at VSS, no delay occurs after failed detect cycles. VSS (Pins 4, 5, 6, 13): Negative Power Supply. Pins 4, 5, 6 and 13 should be tied together on the PCB. For optimum power delivery, supply voltage should be maximized. See Applications Information section for more information. OSC (Pin 7) Oscillator for AC Disconnect. If AC discon- nect is used, connect a 0.1μF X7R capacitor from OSC to VSS. Tie OSC to VSS to disable AC disconnect and enable DC disconnect. ACOUT (Pin 8): AC Disconnect Sense. Senses the port to determine whether a PD is still connected when in AC disconnect mode. If port capacitance drops below about 0.15μF for longer than TMPDO the port is turned off. If AC disconnect is used, connect this pin to the port with a series combination of a 1k resistor and a 0.47μF 100V X7R capacitor. See the Applications Information section for more information. OUT (Pins 9, 10): Port Output. If DC disconnect is used, these pins are connected to the port. If AC disconnect is used, these pins are connected to the port through a parallel combination of a 1A diode and a 500k resistor. Pins 9 and 10 should be tied together on the PCB. See the Applications Information section for more information. VDD48 (Pin 11): Power Return for VSS. Must be bypassed with a 0.1μF capacitor to VSS. For optimum power delivery, supply voltage should be maximized. See Applications Information section for more information. SD (Pin 12): Shutdown. If held low, the LTC4263-1 is prevented from performing detection or powering the port. Pulling SD low will turn off the port if it is powered. When released, a 4-second delay will occur before detection is attempted. If not used, tie to VDD5. VDD5 (Pin 14): Logic Power Supply. Apply 5V referenced to VSS, if such a supply is available, or place a 0.1μF bypass capacitor to VSS to enable the internal regulator. When the internal regulator is used, this pin should only be connected to the bypass capacitor and to any logic pins of the LTC4263-1 that are being held at VDD5. Exposed Pad (Pin 15): VSS. Must be connected to VSS on the PCB. The Exposed Pad acts as a heat sink for the internal MOSFET. |
Similar Part No. - LTC4263IDE-1-TRPBF |
|
Similar Description - LTC4263IDE-1-TRPBF |
|
|
|
Link URL |
| Privacy Policy |
| ALLDATASHEET.COM |
| Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Datasheet Upload | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
| Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
|
Family Site : ic2ic.com |
icmetro.com |
English ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
