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3.3V, Step-Down, Current-Mode PWM DC-DC Converters

We Recommend Improved Performance Devices, MAX887 for MAX763A, MAX1684/MAX1685 for MAX748A, for New Designs

Product Details

Key Features

Parametric specs for Step-Down Switching Regulators
VIN (V) (min) 3.3
VIN (V) (max) 11
VOUT1 (V) (min) 3.3
VOUT1 (V) (max) 3.3
IOUT1 (A) (max) 0.5
Switch Type Internal
Preset VOUT (V) 3.3
Output Adjust. Method Preset
Resistor
# DC-DC Outputs 1
Switching Frequency (kHz) 212.5
Package/Pins SOIC (N)/8
Budgetary
Price (See Notes)
2.66
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Simplified Block Diagram

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Parameters

Parametric specs for Step-Down Switching Regulators
VIN (V) (min) 3.3
VIN (V) (max) 11
VOUT1 (V) (min) 3.3
VOUT1 (V) (max) 3.3
IOUT1 (A) (max) 0.5
Switch Type Internal
Preset VOUT (V) 3.3
Output Adjust. Method Preset
Resistor
# DC-DC Outputs 1
Switching Frequency (kHz) 212.5
Package/Pins SOIC (N)/8
Budgetary
Price (See Notes)
2.66

Key Features

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

Applications/Uses

  • 5V to 3.3V Conversion
  • Cell Phones
  • Computer Peripherals
  • Handheld Computers
  • Portable Instrumentation

Description

The MAX748A/MAX763A are 3.3V-output CMOS, step-down 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. A 22µH inductor works in most applications, so no magnetics design is necessary.

The MAX748A/MAX763A also feature cycle-by-cycle current limiting, overcurrent limiting, undervoltage lockout, and programmable soft-start protection. The MAX748A is available in 8-pin DIP and 16-pin wide SO packages; the MAX763A comes in 8-pin DIP and SO packages.

Simplified Block Diagram

MAX748A, MAX763A: Typical Operating Circuit MAX748A, MAX763A: Typical Operating Circuit Zoom icon

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .