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ST662ABD-ST662ABD-TR-ST662ABN-ST662ACD-ST662ACD-TR
DC-DC CONVERTER FROM 5V TO 12V, 0.03A FOR FLASH MEMORY PROGRAMMING SUPPLY
ST662ADC-DC CONVERTER FROM 5V TO 12V, 0.03A
FOR FLASH MEMORY PROGRAMMING SUPPLY
June 1997 OUTPUT VOLTAGE: 12V ± 5% SUPPLY VOLTAGE RANGE: 4.5V TO 5.5V GUARANTEED OUTPUT CURRENT UP TO
30mA VERY LOW QUIESCENT CURRENT: 100μA LOGIC CONTROLLED ELECTRONIC
SHUTDOWN: 1μA JUST CAPACITORS NEEDED (NO
INDUCTOR)
DESCRIPTION The ST662A is a regulated charge pump DC-DC
converter. It provides 12V ± 5% output voltage to
program byte-wide flash memory, and can supply
30mA output current from input as low as 4.75V logic controlled shut down pin that interfaces
directly with microprocessor reduces the sypply
current to only 1μA
TYPICAL APPLICATION CIRCUIT1/12
ABSOLUTE MAXIMUM RATINGSAbsolute Maximum Rating are those values beyond which damage to the device may occur.
Functional operation under these condition is not implied.
CONNECTION DIAGRAM AND (top view)
PIN CONNECTIONS
ORDERING NUMBERS(*) AVAILABLE IN TAPE AND REEL WITH "-TR" SUFFIX
ST662A2/12
ELECTRICAL CHARACTERISTICS (Refer to the test circuits, VCC = 4.5V to 5.5V Ta = Tmin to Tmaxunless otherwise specified. Typical Value are referred at Ta = 25 oC)
Do not overload or short the Output to Ground. If the above conditions are observerd, the device may be damaged.
Output Voltage vs Temperature
Supply Current vs Temperature
Output Voltage vs Temperature
Supply Currernt vs Supply Voltage
ST662A3/12
Output Voltage vs Shutdown Input Voltage
Test Circuit
Output Voltage vs Shutdown Input Voltage
SHDN Pin Current vs Temperature Output Voltage vs Shutdown Input Voltage
ST662A4/12
DESCRIPTIONThe 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 Circuitlow 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 ShutdownNOTE: VCC = 5V, IOUT = 200μA NOTE: VCC = 5V, IOUT = 200μA
ST662A5/12
