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ST763ACD-ST763ACDTR
3.3V STEP DOWN CURRENT MODE PWM DC-DC CONVERTERS
1/10November 2000 OUTPUT VOLTAGE 3.3V SUPPLY VOLTAGE RANGE FROM 3.3V TO
11V GUARANTEED OUTPUT CURRENT: 500mA TYPICAL OPERATION FREQUENCY:
200KHz VERY LOW QUIESCENT CURRENT: 0.6mA
ON MODE 0.2μA OFF MODE SWITCH ON/OFF CONTROL TYPICAL EFFICENCY: 90% OPERATING TEMPERATURE RANGE:
-40°C TO 85°C AVAILABLE IN SO-8 AND DIP-8 PACKAGES
DESCRIPTIONThe ST763A is a step-down switching regulator . It
operates from 3.3V to 11V giving a fixed 3.3V
output voltage, delivering up to 500mA. The
mainly features are typical efficiency of 90%,
quiescent current of 0.6mA, and only 0.2μA in
shut-down.
The PWM current mode control provides precise
output regulation and very good transient
response. Output voltage accuracy is guaranteed
to be ±5% over line, load and temperature
variations. A minimum number of external
components is used and the fixed frequency
switching allows easy filtering of output ripple and
noise.
Other features of this ddevice are cycle-by-clicle
current limiting, overcurrent limiting, under voltage
lockout and programmable soft-start protection.
A 22μH inductor works in most applications, so no
sophisticated design is necessary.
Package available are SO-8 and DIP-8.
Typical application are in 5V to 3.3V converters,
cellular phones, portable instruments, hand-held
computers, and peripherals.
ST763A
SERIES3.3V STEP DOWN
CURRENT MODE PWM DC-DC CONVERTERS
SCHEMATIC DIAGRAM
ST763A SERIES2/10
ABSOLUTE MAXIMUM RATINGS Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these condition is
not implied.
THERMAL DATA (*) This value depends from thermal design of PCB on which the device is mounted.
ORDERING CODES
ST763A SERIES3/10
CONNECTION DIAGRAM (top view)
PIN DESCRIPTION
ST763A SERIES4/10
ELECTRICAL CHARACTERISTICS (VCC =5V, IO = 0mA, TA = TMIN to TMAX , unless otherwise specified.)
TYPICAL APPLICATION CIRCUIT
ST763A SERIES5/10
TYPICAL PERFORMANCE CHARACTERISTICS (unless otherwise specified Tj = 25°C
Figure 1 : Output Voltage vs Temperature
Figure 2 : Output Voltage vs Input Voltage
Figure 3 : Reference Voltage vs Temperature
Figure 4 : Efficency vs Temperature
Figure 5 : Efficency vs Output Current
Figure 6 : LX Leakage Current vs Temperature ST763A SERIES6/10
Figure 7 : LX ON Resistance vs Temperature
Figure 8 : Shutdown Input Threshold vs Temperature
Figure 9 : Shutdown Input Leakage Current vs Temperature
Figure 10 : Oscillator Frequency vs Temperature
Figure 11 : Oscillator Frequency vs Input Voltage
Figure 12 : Switching Waveforms, Continuous Conduction
