LT1641 Linear Technology Corporation, LT1641 Datasheet
LT1641
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LT1641 Summary of contents
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... The LT1641-1/LT1641-2 are recommended for new designs. The LT1641 is available in the 8-lead SO package. , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. 24V Input Voltage Automatic Restart Application ...
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... Output Voltage (PWRGD) ........................– 0.3V to 100V Output Voltage (GATE) ............................– 0.3V to 100V Operating Temperature Range LT1641CS8 ............................................. 0°C to 70°C LT1641IS8 .......................................... – 40°C to 85°C Storage Temperature Range ................. – 65°C to 150°C Lead Temperature (Soldering, 10 sec).................. 300°C DC ELECTRICAL CHARACTERISTICS temperature range, otherwise specifications are at T ...
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... FB Pin Hysteresis vs Temperature 0.100 0.095 V = 48V CC 0.090 0.085 0.080 0.075 0.070 0.065 0.060 0.055 0.050 0.045 0.040 100 –50 – TEMPERATURE (°C) LT1641 = 24V MIN TYP 6 1.7 3.2 1.5 0 Pin Low Voltage Threshold vs Temperature 1.250 V = 48V 1.245 CC 1.240 1.235 1.230 1.225 1.220 1.215 1.210 1 ...
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... LT1641 W U TYPICAL PERFOR A CE CHARACTERISTICS Gate Drive vs Temperature 48V 10. –50 – 100 TEMPERATURE (°C) 1641 G07 TIMER Pin Pull Up Current –45° 0° 25° 85° ...
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... To defeat current limit, short the SENSE pin to the V V (Pin 8): The Positive Supply Input ranges from 80V for normal operation typically 2mA. An internal CC undervoltage lockout circuit disables the chip for inputs less than 8.3V. LT1641 CC – 47mV CC SENSE pin. CC 1641fd ...
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... LT1641 W BLOCK DIAGRA GEN P FB REF GEN 1.233V 8.3V 0.5V 1.233V TEST CIRCUIT 6 SENSE V P – 12mV ~ 47mV + + 0.5V – + – – UNDERVOLTAGE LOCKOUT + LOGIC + – + – SENSE + V PWRGD GATE 5V 5k GND TIMER 1641 F01 Figure 1 CHARGE PUMP AND GATE ...
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... The transient currents can permanently damage the con- nector pins and glitch the system supply, causing other boards in the system to reset. The LT1641 is designed to turn on a board’s supply voltage in a controlled manner, allowing the board to be safely inserted or removed from a live backplane. The chip ...
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... For a 0.025Ω sense resistor, the current limit is set at 1.88A and folds back to 480mA when the output is shorted to ground. The LT1641 also features a variable overcurrent response time. The time required for the chip to regulate the GATE pin (Pin 6) voltage is a function of the voltage across the sense resistor connected between the V the SENSE pin (Pin 7) ...
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... Signal inversion is accom- plished by transistor Q2 and R7. Supply Transient Protection The LT1641 is 100% tested and guaranteed to be safe from damage with supply voltages up to 100V. However, spikes above 100V may damage the part. During a short- circuit condition, the large change in currents flowing through the power supply traces can cause inductive voltage spikes which could exceed 100V ...
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... IRF530 D1 R5 CMPZ R3 5248B 10Ω 59k R6, 10nF D2 1k, 5% 30V 1N5256B SENSE GATE 3.57k LT1641 1% 3 PWRGD TIMER GND 0.68µF Figure 12. Overvoltage Detection V OUT 24k 5% PWRGD 1641 F10 V OUT + 24k 5% PWRGD 1641 F12 ...
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... C L 220µ 47k ON/OFF GATE 4.22k LT1641 1% 3 PWRGD Q2 GND MMBT5551LT1 4 Figure 14. Active Low Enable Module I LOAD SENSE RESISTOR LT1641 LOAD 1541 F16 ACTIVE LOW + V + OUT V OUT – V – OUT 1641 F14 S 1641fd 11 ...
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... DESCRIPTION LT1640A Negative High Voltage Hot Swap Controller LTC1421 Dual Channel Hot Swap Controller LTC1422 High Side Drive Hot Swap Controller in SO-8 LT1641-1/LT1641-2 Positive High Voltage Hot Swap Controller LTC1642 Fault Protected Hot Swap Controller LTC1643 PCI Hot Swap Controller LT4250 ...