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ST750ACD
ADJUSTABLE STEP-DOWN CURRENT MODE PWM DC-DC CONVERTERS
UP TO 450mA LOAD CURRENTS 200kHz HIGH-FREQUENCY CURRENT-MODE PWM 85% TO 96% EFFICIENCIES 33μH OR 100μH PRE-SELECTED
INDUCTOR VALUE, NO COMPONENT
DESIGN REQUIRED 0.8mA QUIESCENT CURRENT 0.3μA SHUTDOWN SUPPLY CURRENT ADJUSTABLE OUTPUT VOLTAGE OVERCURRENT, SOFT-START AND
UNDERVOLTAGE LOCKOUT PROTECTION CYCLE-BY-CYCLE CURRENT LIMITING PACKAGE AVAILABLE : DIP- 8 AND SO - 8
DESCRIPTION The ST750A is an adjustable output CMOS,
step-down switching regulator. The ST750A
accepts inputs between 4V and 11V and delivers
450mA. Typical efficiencies are 85% to 96%.
Quiescent supply current is 0.8mA and only 0.3μA
in shutdown mode. The output does not exhibit
frequency over this specified range. Pulse-width
modulation (PWM) current-mode control provides
precise output regulation and excellent transient
responses. Output voltage accuracy is
guaranteed to be ±4.5% plus feedback resistor
tolerance over line, load, and temperature
varations.
Fixed-frequency switching and absence of
subharmonic ruipple allows easy filtering of output
ripple and noise, as well as the use of small
external components. This regulators require only
a single inductor value to work in most
applications, so no inductor design is necessary.
Typical applications are: Cellular phones & radios,
portable Instruments, Portable Communications
Equipments and Computer Peripherals.
ST750AADJUSTABLE STEP-DOWN,
CURRENT-MODE PWM DC-DC CONVERTERS
SCHEMATIC DIAGRAM
ST750A
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
ST750A
CONNECTION DIAGRAM (top view)
PIN DESCRIPTION
ST750A
ELECTRICAL CHARACTERISTICS (VCC =5V, IO = 0mA, TA = TMIN to TMAX , unless otherwise specified.)
TYPICAL APPLICATION CIRCUIT
ST750A
TYPICAL PERFORMANCE CHARACTERISTICS (unless otherwise specified Tj = 25°C
Figure 1 : Efficency vs Output Current
Figure 2 : Supply Current vs Temperature
Figure 3 : Oscillator Frequency vs Temperature
Figure 4 : Oscillator Frequency vs Input Voltage
Figure 5 : Peak Inductor Current vs Output Current
Figure 6 : Output Voltage vs Output Current ST750A
Figure 7 : Switching Waveforms, Continuous Conduction
Figure 8 : Switching Waveforms, Discontinuous Conduction
Figure 9 : Line Transient
Figure 10 : Load Transient
