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AS7620 Arkusz danych(PDF) 1 Page - ams AG |
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AS7620 Arkusz danych(HTML) 1 Page - ams AG |
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1 / 16 page  AS7620 500mA Hysteretic High Vo ltage Step-Down Converter with Dual Power Monitor www.austriamicrosystems.com Revision 1.13 1 - 16 Datasheet 1 General Description The AS7620 is an easy-to-use, high-efficiency, high- voltage, hysteretic step-down DC-DC converter, operating in asynchronous mode. Its low-power architecture extends hold-up time in battery-backed and critical applications where maximum up-time over a wide input supply voltage range is needed, while still providing for high efficiencies of up to 90% during peak current demands. Although the AS7620 is optimized for 24V applications found in industrial and medical systems, its ability to support 100% Duty Cycle makes the AS7620 ideal for applications demanding maximum up-time and soft power fail behavior. In combination with low idle current of only 30µA, on-demand switching reduces operating current at low load currents. By selecting an appropriate inductor value, operating current can be lowered and switching frequencies tuned to certain load conditions. A pin-strapped current limit input minimizes inductor peak current and thus inductor size and cost for any given application. The device further includes output short-circuit protection and thermal shutdown. In shutdown mode, only 1µA (typ) of current is consumed. Figure 1. Block Diagram 2 Key Features ! Low quiescent current for efficient partial load operation ! Wide Supply Voltage Range, 3.6V to 32V ! 100% Duty Cycle extends operating range ! Pin-programmable cycle-by-cycle current limit ! Integrated PMOS eliminates bootstrap capacitor ! Resistor-programmable Early Power Fail Warning Input ! Power-Good Flag ! Thermal Shutdown ! Fixed 3.3V and adjustable output (1.2V to VIN) ! Small 4x4mm 12-Lead MLPQ Enhanced Power Package ! Specified from -40ºC to +125ºC junction and 85ºC maximum ambient temperatures 3 Applications The AS7620 is suitable for Industrial 24VDC applications like PLCs, robotics; Home Security and Building Control applications; Solid-state utility meters; Signage and LED column power; and Sensor interfaces. + - + - + - LX ILIM PG PF VIN SHDN FB VEPF LDO Temp Level Shifter Soft-Start ISENSE VREF Hysteretic Controller AS7620 |
Podobny numer części - AS7620 |
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Podobny opis - AS7620 |
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