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ST750A 데이터시트(PDF) 1 Page - STMicroelectronics |
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ST750A 데이터시트(HTML) 1 Page - STMicroelectronics |
1 / 9 page 1/9 January 2003 s UP TO 450mA LOAD CURRENTS s 200kHz HIGH-FREQUENCY CURRENT-MODE PWM s 85% TO 96% EFFICIENCIES s 33 µHOR100µH PRE-SELECTED INDUCTOR VALUE, NO COMPONENT DESIGN REQUIRED s 0.8mA QUIESCENT CURRENT s 0.3µA SHUTDOWN SUPPLY CURRENT s ADJUSTABLE OUTPUT VOLTAGE s OVERCURRENT, SOFT-START AND UNDERVOLTAGE LOCKOUT PROTECTION s CYCLE-BY-CYCLE CURRENT LIMITING s PACKAGE AVAILABLE : DIP- 8 AND SO - 8 DESCRIPTION The ST750A is an adjustable output CMOS, step-down switching regulator. The ST750A accepts inputs between 4V and 11V and delivers 450mA. Typical efficiencies are 85% to 96%. Quiescent supply current is 0.8mA and only 0.3 µA in shutdown mode. The output does not exhibit frequency over this specified range. Pulse-width modulation (PWM) current-mode control provides precise output regulation and excellent transient responses. Output voltage accuracy is guaranteed to be ±4.5% plus feedback resistor tolerance over line, load, and temperature varations. Fixed-frequency switching and absence of subharmonic ruipple allows easy filtering of output ripple and noise, as well as the use of small external components. This regulators require only a single inductor value to work in most applications, so no inductor design is necessary. Typical applications are: Cellular phones & radios, portable Instruments, Portable Communications Equipments and Computer Peripherals. ST750A ADJUSTABLE STEP-DOWN, CURRENT-MODE PWM DC-DC CONVERTERS SCHEMATIC DIAGRAM DIP-8 SO-8 |
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