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ST662ACD Fiches technique(PDF) 5 Page - STMicroelectronics

No de pièce ST662ACD
Description  DC-DC CONVERTER FROM 5V TO 12V, 0.03A FOR FLASH MEMORY PROGRAMMING SUPPLY
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Fabricant  STMICROELECTRONICS [STMicroelectronics]
Site Internet  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST662ACD Fiches technique(HTML) 5 Page - STMicroelectronics

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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


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