ST662ABD-TR(2007) 查看數據表（PDF） - STMicroelectronics

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ST662ABD-TR
(Rev.:2007)

DC-DC converter from 5V to 12V, 0.03A for flash memory programming supply

STMicroelectronics 

ST662AB - ST662AC

6

Description

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

Figure 12.) 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 VI is applied to the capacitor C4. This works as voltage triple. 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.

Figure 13. 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 the VI value by D1. In this

condition ICC will be. low as 1µA. The Figure 14. shows the transition time of the shut down

pin when the VSHDN goes from 0V to 5V.

Figure 12. Operating principle circuit

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