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LTC4216IMS Datasheet(PDF) 8 Page - Linear Technology |
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LTC4216IMS Datasheet(HTML) 8 Page - Linear Technology |
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8 / 24 page  LTC4216 4216f 8 Hot Circuit Insertion When circuit boards are inserted into a live backplane, the supply bypass capacitors can draw huge transient current from the power bus as they charge. Potentially, the flow of current could damage the connector pins and glitch the power bus, causing other boards in the system to reset. The LTC4216 is designed to turn on or off a circuit board supply in a controlled manner, allowing insertion or removal without glitches or connector damage. Overview of LTC4216 Features 1. Allows safe board insertion and removal from a live backplane. 2. Controls load voltages from 0V to 6V. 3. High side gate drive for external N-channel MOSFET. 4. Adjustable soft-start with inrush current limiting for large load capacitor during start-up. 5. Adjustable analog current limit (ACL) with circuit breaker fault time-out during an overcurrent fault condi- tion. No external gate capacitor is required for the ACL loop compensation. 6. Electronic circuit breaker tripping at 25mV across the sense resistor. The response time is adjustable through an external capacitor at the FILTER pin. 7. Provides an ON pin to turn on and off the device. This can also be used to reset the device after a circuit breaker trip. 8. Provides output supply voltage monitoring through the FB pin and signals the ⎯R⎯E⎯S⎯E⎯T pin output. 9. Provides fault status output. ON Control The ON pin has two hysteretic comparators with differ- ent threshold levels (0.8V and 0.4V) and they serve two purposes: 1. Turn on the device if the ON pin voltage > 0.8V for more than 6µs and turn it off if the ON pin voltage < 0.72V for more than 15µs. 2. Reset the device if the ON pin voltage < 0.4V for more than 30µs after a circuit breaker trip. There are various methods of setting the ON pin voltage: 1. Tie the ON pin to the load supply (VIN) through a 10k pull-up resistor. 2. Drive the ON pin with an ON/OFF logic signal from the system controller. 3. Connect an external resistive divider at the ON pin. This divider can be used to set a higher value for the load supply undervoltage lockout voltage than the internal VCC undervoltage lockout circuit. For example, as shown in Figure 17, if both VCC and SENSEP pins are connected to a 5V load supply, choosing the resistive divider values, R1 = 20k, R2 = 80.6k, turns on the device when the load supply voltage reaches around 80% of its final value. VCC Undervoltage Lockout A hysteretic comparator, UVLO, monitors bias supply (VCC) for undervoltage. The thresholds are defined by VCC(UVL) (2.12V) and its hysteresis, ΔVCC(UVL,HYST) (120mV). When VCC rises above VCC(UVL), the device is enabled. When VCC falls below (VCC(UVL) – ΔVCC(UVL,HYST)), the device is disabled and GATE is pulled low. If VCC cycles below this threshold for more than 200µs, following a circuit breaker trip, it clears the fault latch. Any bias sup- ply glitches that last less than 10µs will be rejected by the UVLO glitch filter. Timer An external capacitor, C1, is used at TIMER pin to provide two timing cycles for the LTC4216. The first timing cycle is the debounce cycle when the ON pin is first turned on, both the GATE and SS pins are held low and any short- circuit faults are ignored by the electronic circuit breaker. Second timing cycle is the power-good delay before the ⎯R⎯E⎯S⎯E⎯T pin goes high when the FB pin voltage exceeds 0.6V and its hysteresis. The TIMER pin sources 2µA into C1 during the two timing cycles and is then pulled low by an internal N-channel APPLICATIO S I FOR ATIO |
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