ST662ACD データシートの表示（PDF） - STMicroelectronics

部品番号

コンポーネント説明

一致するリスト

ST662ACD

DC-DC CONVERTER FROM 5V TO 12V, 0.03A FOR FLASH MEMORY PROGRAMMING SUPPLY

STMicroelectronics 

ST662A

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 1µA. The fig.3 shows the transition time

of the shut down pin when the VSHDN goes from

0V to 5V.

Figure 2: Exiting Shutdown

Figure 3: Entering Shutdown

5V

0V

SHDN

5V

0V

SHDN

Vout

12V

5V

TIME= 20us/DIV, VERTICAL = 5V/DIV

NOTE: VCC = 5V, IOUT = 200µA

12V

Vout

5V

TIME= 1ms/DIV, VERTICAL = 5V/DIV

NOTE: VCC = 5V, IOUT = 200µA

5/12

Share Link: