ADM1073ARU Analog Devices Inc, ADM1073ARU Datasheet
ADM1073ARU
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ADM1073ARU Summary of contents
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FEATURES Precision inrush linear current limit Soft start inrush current limit profiling Precision maximum on-time in current limit Maximum on-time modulated by FET drain voltage for additional SOA protection Adjustable PWM retry scheme and multiple device cascading capability for charging ...
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ADM1073 TABLE OF CONTENTS General Description ......................................................................... 3 Specifications..................................................................................... 4 Absolute Maximum Ratings............................................................ 6 Thermal Characteristics .............................................................. 6 ESD Caution.................................................................................. 6 Pin Configuration and Function Descriptions............................. 7 Typical Performance Characteristics ............................................. 8 Functional Description .................................................................. 13 Hot Circuit Insertion ................................................................. ...
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GENERAL DESCRIPTION (continued from Page 1) Further control of the inrush current is provided by modulating the width of the pulses, depending on the drain-source voltage across the FET. This allows maximum charge transfer to the load capacitance while maintaining ...
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ADM1073 SPECIFICATIONS − −40°C to +85°C, unless otherwise noted Table 1. Parameter BOARD SUPPLY (Not Connected Directly to Device) Maximum Voltage Range Typical Operating Voltage Range V PIN—SHUNT ...
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Parameter DRAIN (FOLDBACK) AND PWRGD DRAIN Voltage at Which PWRGD Asserts Maximum DRAIN Pin Current Allowable, I PWRGD Output Voltage Low PWRGD Internal Pull-Up Current PWRGD Output Voltage High RESTART Time before Restart Input Threshold Glitch Filter Internal Pull-Up Current ...
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ADM1073 ABSOLUTE MAXIMUM RATINGS All voltages referred 25°C, unless otherwise noted Table 2. Parameter Supply Voltage (V − Maximum Shunt Supply Voltage SENSE Pin GATE Pin UV ...
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PIN CONFIGURATION AND FUNCTION DESCRIPTIONS Table 3. Pin Function Descriptions Pin Number Mnemonic Function 1 RESTART Input Pin. Edge-triggered 5-second shutdown and automatic restart Shunt Regulated Positive Supply to Chip. Connect to the positive supply rail via shunt ...
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ADM1073 TYPICAL PERFORMANCE CHARACTERISTICS 500 450 400 350 300 250 200 150 100 50 0 –50 –35 –20 – TEMPERATURE (°C) Figure 3. I vs. Temperature IN 100.0 10.0 1 –40° +25°C A ...
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TEMPERATURE (°C) Figure 9. V vs. Temperature GATEL 14.0 13.5 13.0 12.5 12.0 11.5 11.0 10.5 10.0 –50 –35 –20 –5 10 ...
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ADM1073 1000 980 960 940 920 900 880 860 840 820 800 –50 –35 –20 – TEMPERATURE (°C) Figure 15. UV Threshold vs. Temperature 2.00 1.98 1.96 1.94 1.92 1.90 1.88 1.86 1.84 1.82 1.80 –50 –35 –20 ...
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V FCL 110 105 100 V ACL –50 –35 –20 – TEMPERATURE (°C) Figure 21. Voltage Limits for Load Current Control vs. Temperature 3.0 V (HIGH) TMR 2.5 2.0 ...
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ADM1073 1.0 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 –50 –35 –20 – TEMPERATURE (°C) Figure 27. Continuous Short Circuit Time before Shutdown vs. Temperature ...
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FUNCTIONAL DESCRIPTION HOT CIRCUIT INSERTION Inserting circuit boards into a live −48 V backplane can cause large transient currents to be drawn as the board capacitance charges up. These transient currents can cause glitches on the system power supply and ...
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ADM1073 When the device detects that the supply voltage is valid, it ramps up the GATE voltage until the FET turns on and the load current increases. The ADM1073 monitors the level of the current flowing through the FET by ...
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SENSE The SENSE pin is used for sensing the voltage across an external power sense resistor. This voltage is differentially measured with respect and used to control the GATE SENSE is lower than 100 mV ...
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ADM1073 DRAIN Analog input fed by a resistor connected to the drain of the FET. This pin is clamped higher than 4 V with respect to V Below this level, the voltage on the pin is monitored ...
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UV (Undervoltage) The voltage on the UV pin is compared to an internal 0.868 V reference. For the implementation in Figure 33, the undervolt- age level is then set 0.868 × (R1 + R2)/ the ...
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ADM1073 FUNCTIONALITY AND TIMING LIVE INSERTION The timing waveforms associated with the live insertion of a plug-in board using the ADM1073 are shown in Figure 36. The long connector pins are the first to make connection, and the GND − ...
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An undervoltage glitch is dealt with in a similar way. When V falls below the undervoltage threshold of 0.868 V, the GATE voltage is pulled low. V begins to rise back toward the UV operating voltage window, and the GATE ...
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ADM1073 CURRENT FAULTS Some timing waveforms associated with overcurrent faults are shown in the following figures. Figure 43 shows how a perma- nent current fault is dealt with after startup. SPLYGD going low indicates when the supply voltage is good. ...
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LOGIC INPUTS Figure 46 shows assertion of the level-triggered SHDN signal for 150 ms, causing the ADM1073 to shut down for this duration. Figure 46. Timing Waveforms Associated with a RESET Event (Ch1 = GATE; Ch2 = SHDN ; Ch3 ...
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... ORDERING GUIDE Model Temperature Range ADM1073ARU −40°C to +85°C ADM1073ARU-REEL −40°C to +85°C ADM1073ARU-REEL7 −40°C to +85°C EVAL-ADM1073EB EVAL-ADM1073MEB 1 Includes Main Evaluation Board for bench evaluation and Micro Evaluation Board for in-system evaluation. 5.10 5.00 4.90 ...
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NOTES Rev Page ADM1073 ...
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ADM1073 NOTES © 2004 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D04488–0–4/04(0) Rev. 0| Page ...