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MAX5903 Datasheet(PDF) 5 Page - Maxim Integrated Products |
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MAX5903 Datasheet(HTML) 5 Page - Maxim Integrated Products |
5 / 11 page +72V SOT23 Simple Swapper Hot-Swap Controllers _______________________________________________________________________________________ 5 Detailed Description The MAX5902/MAX5903 are integrated hot-swap con- troller ICs contained in 6-pin SOT23 packages. They allow a board to be safely hot-plugged into a live back- plane without causing a glitch on the power-supply rail. They are well suited for +48V power systems allowing cost-effective, simple, and compact design. The MAX5902/MAX5903 operate from +9V to +72V to cover a wide range of end equipment hot-swap needs. They require only an external P-channel power MOSFET to provide hot-swap control. Figure 1 shows a functional block diagram of the MAX5902/MAX5903. The MAX5902/MAX5903 controls an external P-channel power MOSFET placed in the positive power-supply pathway. When power is first applied, the MAX5902/ MAX5903 keep the MOSFET turned off. The MAX5902/MAX5903 hold the MOSFET off indefinitely if ON/OFF is held low, if the supply voltage is below the undervoltage lockout level, or if the die temperature exceeds +125°C. If none of these conditions exist for 150ms (typ), the MAX5902/MAX5903 begin to gradually turn on the MOSFET. During this turn-on phase, the MAX5902/MAX5903 slowly enhance the MOSFET, allowing the voltage on the load, i.e. the drain of the MOSFET, to rise at a rate of 9V/ms (typ). The inrush cur- rent to the load is thus limited to a level proportional to the load capacitance, and the constant slew rate. After the MOSFET is fully enhanced, and the load voltage is settled to its final value, the MAX5902A/ MAX5903A and MAX5902L/MAX5903L monitor the voltage drop across the MOSFET. If the voltage drop exceeds the circuit breaker threshold the MAX5902A/MAX5903A and MAX5902L/MAX5903L turn off the MOSFET, discon- VS ON/OFF GND GND GND 3V MAX5902 MAX5903 828k Ω *900k Ω 34.5k Ω 1k Ω GATE DRAIN CONTROL LOGIC PGOOD (PGOOD) ( ) ARE FOR THE MAX5903 ONLY * RELATIVE TOLERANCE ±1%, ABSOLUTE TOLERANCE ±50% (TYP) *650k Ω * * Figure 1. Functional Block Diagram Pin Description PIN MAX5902 MAX5903 NAME FUNCTION 11 VS Positive Supply Voltage Input and External P-Channel MOSFET Source Connection 2 2 DRAIN Drain Sense Input for External P-Channel MOSFET. Connect DRAIN as close as possible to the MOSFET’s drain and use wide circuit traces to assure good thermal coupling between the MAX5902/MAX5903 and the MOSFET. See Layout Guidelines. 3 3 GATE Gate Drive Output for External P-Channel MOSFET 4 4 GND Ground Connection 5 — PGOOD Power Good Output. PGOOD is an N-channel, open-drain, active-low output, referenced to GND. — 5 PGOOD Power Good Output. PGOOD is an N-channel, open-drain, active-high output, referenced to GND. 6 6 ON/OFF ON/OFF Control Input. ON/OFF is referenced to GND. Drive ON/OFF above 1.38V or leave unconnected to enable the device. Drive ON/OFF below 1V to disable the device. ON/OFF is also used to adjust the UVLO threshold. Internally clamped to nominally 3V through a 1k Ω resistor. (See Figure 1.) (See Undervoltage Lockout in the Applications section of this data sheet.) |
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