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ST662AB Datasheet(PDF) 5 Page - STMicroelectronics |
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ST662AB Datasheet(HTML) 5 Page - STMicroelectronics |
5 / 12 page DESCRIPTION The ST662 is an IC developed to provide a 12V regulated output 30mA from voltage input as low as 4.75 without any inductors. It is useful for a wide range of applications and its performances makes it ideal for flash memory programming supply. An evaluation kit is provided to facilitate the application. This include a single-side demo board designed for surface-mount components.The operating principle of ST662 (see fig. 1) is to charge C1 and C2 capacitor by closing the S1 switch (while S2 is opened) at the VCC voltage. After S1 will be opened and S2 closed so that C1 and C2 capacitors are placed in series one to each other, and both are in series with Vin.The sum of VC1 and VC2 and Vin is applied to the capacitor C4. This works as voltage tripler. An amplifier error checks the output voltage and blocks the oscillator if the output voltage is greater than 12V. The shutdown pin is internally pulled to VCC. When it is held low the output voltage rises to +12V. Fig.2 shows the transition time of the shut down pin when the VSHDN goes from 5V to 0V. Input logic levels of this input are CMOS compatible. Applying a logic high at this input, the VOUT oscillator will be blocked and the VOUT will reach theVIN value by D1. In this condition ICC will be Figure 1: Operating Principle Circuit low as 1 µA. The fig.3 shows the transition time of the shut down pin when the VSHDN goes from 0V to 5V. Figure 2: Exiting Shutdown TIME= 20us/DIV, VERTICAL = 5V/DIV 5V 0V 12V 5V SHDN Vout Figure 3: Entering Shutdown TIME= 1ms/DIV, VERTICAL = 5V/DIV 5V 0V 12V 5V SHDN Vout NOTE: VCC = 5V, IOUT = 200 µA NOTE: VCC = 5V, IOUT = 200 µA ST662A 5/12 |
Número de pieza similar - ST662AB |
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Descripción similar - ST662AB |
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