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ST662ACD-TR Folha de dados(PDF) 9 Page - STMicroelectronics

Nome de Peças ST662ACD-TR
Descrição Electrónicos  DC-DC converter from 5 V to 12 V, 0.03 A for Flash memory programming supply
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Fabricante Electrônico  STMICROELECTRONICS [STMicroelectronics]
Página de início  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST662ACD-TR Folha de dados(HTML) 9 Page - STMicroelectronics

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ST662AB - ST662AC
Description
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Description
The ST662 is an IC developed to provide a 12 V regulated output 30 mA 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 12 V. The
shutdown pin is internally pulled to VCC. When it is held low the output voltage rises to
+12 V. Figure 13 shows the transition time of the shut down pin when the VSHDN goes from
5 V to 0 V. 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 1 µA. The Figure 14 shows the transition time of the shut down
pin when the VSHDN goes from 0 V to 5 V.
Figure 12.
Operating principle circuit


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