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MAX748A - 3.3V / Step-Down / Current-Mode PWM DC-DC Converters

General Description

The MAX748A/MAX763A are 3.3V-output CMOS, stepdown switching regulators.

The MAX748A accepts inputs from 3.3V to 16V and delivers up to 500mA.

The MAX763A accepts inputs between 3.3V and 11V and delivers up to 500mA.

Key Features

  • o Up to 500mA Load Currents o Guaranteed 159kHz to 219.5kHz Current-Mode PWM o 85% to 90% Efficiencies o 1.7mA Quiescent Current (MAX748A) 1.4mA Quiescent Current (MAX763A) o 0.2µA Shutdown Supply Current o 22µH Preselected Inductor Value; No Component Design Required o Overcurrent, Soft-Start, and Undervoltage Lockout Protection o Cycle-by-Cycle Current Limiting o 8-Pin DIP/SO Packages (MAX763A) MAX748A/MAX763A _________________Ordering Information PART MAX748ACPA MAX748ACWE MAX748AC/D MAX748.

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Full PDF Text Transcription (Reference)

The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

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19-0190; Rev 0; 9/93 3.3V, Step-Down, Current-Mode PWM DC-DC Converters __________________General Description The MAX748A/MAX763A are 3.3V-output CMOS, stepdown switching regulators. The MAX748A accepts inputs from 3.3V to 16V and delivers up to 500mA. The MAX763A accepts inputs between 3.3V and 11V and delivers up to 500mA. Typical efficiencies are 85% to 90%. Quiescent supply current is 1.4mA (MAX763A), and only 0.2µA in shutdown. Pulse-width-modulation (PWM) current-mode control provides precise output regulation and excellent transient responses. Output voltage accuracy is guaranteed to be ±5% over line, load, and temperature variations. Fixed-frequency switching allows easy filtering of output ripple and noise, as well as the use of small external components.