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MAX1973 Datasheet(PDF) 10 Page - Maxim Integrated Products |
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MAX1973 Datasheet(HTML) 10 Page - Maxim Integrated Products |
10 / 15 page soft-start when coming out of undervoltage lockout (UVLO) or thermal-overload protection. Undervoltage Lockout (UVLO) If VIN drops below 2.35V (typ), the MAX1973/MAX1974 assume that the supply voltage is too low to provide a valid output voltage, and the UVLO circuit inhibits switching. Once VIN rises above 2.4V, UVLO is dis- abled and the soft-start sequence begins. Thermal-Overload Protection Thermal-overload protection limits total power dissipa- tion and protects the IC from damage in case of an overload or short-circuit condition. When the IC junction temperature (TJ) exceeds +170°C, the device shuts down. The part turns on again after the junction temper- ature cools by 20°C. This results in a pulsed output dur- ing continuous thermal-overload conditions. Smallest 1A, 1.4MHz Step-Down Regulators 10 ______________________________________________________________________________________ PWM LOGIC BLOCK PMOS CURRENT SENSE VOLTAGE CLAMP NMOS CURRENT LIMIT SLOPE COMP CHIP ENABLE REFERENCE READY UNDERVOLTAGE LOCK OUT FEEDBACK SELECT VOLTAGE MARGINING SOFT-START REFERENCE BIAS MAX1974 ONLY POK IN LX PGND PWM COMPARATOR ERROR AMP 1.4MHz OSCILLATOR IN GND SS COMP OUT FB CTL1 CTL2 ON MAX1973 ONLY MAX1974 ONLY Σ MAX1973 MAX1974 Figure 1. Functional Diagram |
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