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MAX5929LHEEG Datasheet(PDF) 9 Page - Maxim Integrated Products |
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MAX5929LHEEG Datasheet(HTML) 9 Page - Maxim Integrated Products |
9 / 25 page Detailed Description The MAX5927/MAX5929 are circuit-breaker ICs for hot- swap applications where a line card is inserted into a live backplane. The MAX5927/MAX5929 operate down to 1V provided one of the inputs is above 2.7V. Normally, when a line card is plugged in to a live back- plane, the card’s discharged filter capacitors provide low impedance that can momentarily cause the main power supply to collapse. The MAX5927/MAX5929 reside either on the backplane or on the removable card to provide inrush current limiting and short-circuit protection. This is achieved by using external N-chan- nel MOSFETs, external current-sense resistors, and on- chip comparators. The startup period and current-limit threshold of the MAX5927/MAX5929 can be adjusted with external resistors. Figure 1 shows the MAX5927/ MAX5929 functional diagram. The MAX5927 offers four programmable current limits, selectable fault management mode, and selectable STAT_ output polarity. The MAX5929 features fixed cur- rent limits, and a variety of fault management and STAT_ polarity option combinations. Mode The MAX5927/MAX5929 supports three modes of oper- ation: voltage-tracking, power-sequencing, and inde- pendent mode. Select the appropriate mode according to Table 1. Voltage-Tracking Mode Connect MODE high to enter voltage-tracking mode. While in voltage-tracking mode, all channels turn on and off together. To turn all channels on: • At least one VIN_ must exceed VUVLO (2.45V) for the UVLO to startup delay (37.5ms). • All VIN_ must exceed VPWRRDY (0.95V). • All VON_ must exceed VON,TH (0.875V). • No faults may be present on any channel. Low-Voltage, Quad, Hot-Swap Controllers/Power Sequencers _______________________________________________________________________________________ 9 MODE OPERATION High (Connect to BIAS) Voltage tracking OPEN Power sequencing GND Independent Table 1. Operational Mode Selection PIN MAX5927 MAX5929 NAME FUNCTION 21 — LIM3 Channel 3 Current-Limit Setting. Connect a resistor from LIM3 to GND to set current-trip level. Connect to GND for the default 25mV threshold. Do not leave open. 22 20 GATE2 Channel 2 Gate-Drive Output. Connect to gate of external N-channel MOSFET. 23 21 SENSE2 Channel 2 Current-Sense Input. Connect SENSE2 to the drain of an external MOSFET and to one end of RSENSE2. 24 22 IN2 Channel 2 Supply Input. Connect to a supply voltage from 1V to 13.2V and to one end of RSENSE2. 25 — LIM2 Channel 2 Current-Limit Setting. Connect a resistor from LIM2 to GND to set the current- trip level. Connect to GND for the default 25mV threshold. Do not leave open. 26 23 ON4 On/Off Channel 4 Control Input (see the Mode section) 27 24 ON3 On/Off Channel 3 Control Input (see the Mode section) 28 1 MODE Mode Configuration Input. Mode is configured according to Table 1 as soon as one of the IN_ voltages exceeds UVLO and before turning on OUT_ (see the Mode section). 29 — POL STAT Output Polarity Select (See Table 3 and the Status Output Section) 30 2 ON2 On/Off Channel 2 Control Input (See the Mode Section) 31 3 ON1 On/Off Channel 1 Control Input (See the Mode Section) 32 — LIM1 Channel 1 Current-Limit Setting. Connect a resistor from LIM1 to GND to set the current- trip level. Connect to GND for the default 25mV threshold. Do not leave open. EP — EP Exposed Pad. Leave EP floating or connect to GND. Pin Description (continued) |
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