ST662AB_08 STMICROELECTRONICS [STMicroelectronics], ST662AB_08 Datasheet - Page 9

• Manufacturer Part Number: ST662AB_08
• Description: DC-DC converter from 5 V to 12 V, 0.03 A for Flash memory programming supply
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

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 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
the V
placed in series one to each other, and both are in series with V
and V
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
pin when the V
CC
I
Figure 13
12) is to charge C1 and C2 capacitor by closing the S1 switch (while S2 is opened) at
is applied to the capacitor C4. This works as voltage triple. An amplifier error checks
voltage. After S1 will be opened and S2 closed so that C1 and C2 capacitors are
CC
OUT
will be. low as 1 µA. The
SHDN
oscillator will be blocked and the V
shows the transition time of the shut down pin when the V
goes from 0 V to 5 V.
CC
Figure 14
. When it is held low the output voltage rises to
shows the transition time of the shut down
OUT
will reach the V
IN
. The sum of V
I
value by D1. In this
SHDN
C1
goes from
and V
9/19
C2