ACCESS ADJUSTABLE STEP-DOWN CURRENT-MODE PWM REGULATORS

The MAX758EWE are adjustable-output, CMOS, step-down, DC-DC switching regulators. The MAX758EWE accepts inputs from 4V to 16V and delivers 750mA, while the MAX750A accepts inputs from 4V to 11V and delivers 450mA. Typical efficiencies are 85% to 90%. Typical quiescent current is 1.7mA, or only 6µA in shutdown mode. The output does not exhibit any ripple at sub harmonics of the switching frequency over its 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 variations. Fixed-frequency switching and absence of sub harmonic ripple allows easy filtering of output ripple and noise, as well as the use of small external components. These regulators require only a single inductor value to work in most applications, so no inductor design is necessary.

• Up to 750mA Load Currents
• 160kHz High-Frequency, Current-Mode PWM
• 85% to 96% Efficiencies
• 33µH or 100µH Pre-Selected Inductor Value, No Component Design Required
• 1.7mA Quiescent Supply Current
• 6µA Shutdown Supply Current
• Adjustable Output Voltage
• Over current, Soft-Start, and Under voltage Lockout Protection
• Cycle-by-Cycle Current Limiting
• 8-Pin DIP/SO Packages