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MAX5934 Datasheet(PDF) 9 Page - Maxim Integrated Products |
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MAX5934 Datasheet(HTML) 9 Page - Maxim Integrated Products |
9 / 15 page Positive High-Voltage, Hot-Swap Controllers with Selectable Fault Management and Status Polarity _______________________________________________________________________________________ 9 Detailed Description The MAX5934/MAX5934A are fully integrated hot-swap controllers for positive supply rails. These devices allow for the safe insertion and removal of circuit cards into live backplanes without causing glitches on the back- plane power-supply rail. During startup, the MAX5934/ MAX5934A act as current regulators using an external sense resistor and MOSFET to limit the amount of cur- rent drawn by the load. The MAX5934A operates from a +9V to +80V supply voltage range and has a default UVLO set to +8.3V. The MAX5934 operates from a +33V to +80V supply voltage range and has a default UVLO set to +31V. The UVLO threshold is adjustable using a resistive divider connected from VCC to ON to GND (see R2 and R3 in Figure 5). The MAX5934/MAX5934A monitor input voltage, output voltage, output current, and die temperature. These devices feature three power-good outputs (PWRGD_) to indicate status by monitoring the voltage at FB1, FB2, and GATE (see the Power-Good (PWRGD_) Detection section). PWRGD1 indicates an output-volt- age status, PWRGD2 can be used to indicate an over- voltage condition on the main power-supply rail, and PWRGD3 asserts when GATE voltage has charged to 4.3V above the supply rail. PWRGD3 deasserts when the TIMER voltage exceeds a 1.233V threshold in response to an extended fault condition. The MAX5934/MAX5934A control gate voltage on the external MOSFET to limit load current at startup and at overload to a value determined as: MAX5934 MAX5934A ON CL OUT GATE SENSE VCC 16 14 11 9 4 6 5 7 12 8 M1 R1 1k Ω, 5% RSENSE 0.025 Ω C1 10nF RG 10 Ω 5% R4 59k Ω 1% R6 24k Ω 5% R7 24k Ω 5% R10 1k Ω 1% R9 90k Ω 1% R2 49.9k Ω 1% VIN R3 3.4k Ω 1% CTIMER 0.68 µF RL R5 3.57k Ω 1% FB1 2 10 1 3 15 PWRGD1 PWRGD2 TIMER LATCH/RETRY VCC FB2 PWRGD3 VMONITOR PWRGD1 PWRGD2 PWRGD3 DC GND VCC POL_SEL VCC IRF530 Figure 5. Application Circuit |
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