ST662AC STMicroelectronics, ST662AC Datasheet - Page 9

• Manufacturer Part Number: ST662AC
• Description: DC-DC CONVERTER FROM 5V TO 12V, 0.03A FOR FLASH MEMORY PROGRAMMING SUPPLY
• Manufacturer: STMicroelectronics

Specifications of ST662AC

• Output Voltage: 12 V ± 5 %
• Supply Voltage Range: 4.5 V to 5.5 V
• Very Low Quiescent Current: 100 μA
• Logic Controlled Electronic Shutdown: 1 μA

ST662AB, ST662AC
6
Figure 12. Operating principle circuit
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 make 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
the V
in series one to each other, and both are in series with V
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 V
+12 V.
5 V to 0 V. Input logic levels of this input are CMOS compatible Applying a logic high at this
input, the V
condition I
when the V
CC
12) is to charge C1 and C2 capacitor by closing the S1 switch (while S2 is opened) at
Figure 13
voltage. After S1 is opened and S2 closed so that C1 and C2 capacitors are placed
CC
SHDN
OUT
is low as 1 µA. The
oscillator is blocked and the V
goes from 0 V to 5 V.
shows the transition time of the shut down pin when the V
Doc ID 5068 Rev 8
Figure 14
CC
. When it is held low the output voltage rises to
shows the transition time of the shut down pin
OUT
is reach the V
IN
. The sum of V
I
value by D1. In this
C1
SHDN
and V
Description
goes from
C2
and V
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I