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5V, Step-Down, Current-Mode PWM DC-DC Converters

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

Product Details

Key Features

Parametric specs for Step-Down Switching Regulators
VIN (V) (min) 6
VIN (V) (max) 16
VOUT1 (V) (min) 5
VOUT1 (V) (max) 5
IOUT1 (A) (max) 0.75
Switch Type Internal
Preset VOUT (V) 5
Output Adjust. Method Preset
Resistor
# DC-DC Outputs 1
Switching Frequency (kHz) 212.5
Package/Pins PDIP/8
SOIC (W)/16
Budgetary
Price (See Notes)
3.76
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Simplified Block Diagram

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Parameters

Parametric specs for Step-Down Switching Regulators
VIN (V) (min) 6
VIN (V) (max) 16
VOUT1 (V) (min) 5
VOUT1 (V) (max) 5
IOUT1 (A) (max) 0.75
Switch Type Internal
Preset VOUT (V) 5
Output Adjust. Method Preset
Resistor
# DC-DC Outputs 1
Switching Frequency (kHz) 212.5
Package/Pins PDIP/8
SOIC (W)/16
Budgetary
Price (See Notes)
3.76

Key Features

  • 750mA Load Currents (MAX738A/MAX744A)
  • High-Frequency, Current-Mode PWM
  • 159kHz to 212.5kHz Guaranteed Oscillator Frequency Limits (MAX744A)
  • 85% to 96% Efficiencies
  • 1.7mA Quiescent Current
  • 6µA Shutdown Supply Current
  • Single Preselected Inductor Value, No Component Design Required
  • Overcurrent, Soft-Start, and Undervoltage Lockout Protection
  • Cycle-by-Cycle Current Limiting
  • 8-Pin DIP/SO Packages (MAX730A)

Applications/Uses

  • Cell Phones
  • Computer Peripherals
  • Distributed Power Systems
  • Personal Communicators
  • Portable Instrumentation

Description

The MAX730A/MAX738A/MAX744A are 5V-output CMOS, step-down switching regulators. The MAX738A/MAX744A accept inputs from 6V to 16V and deliver 750mA. The MAX744A guarantees 500mA load capability for inputs above 6V and has tighter oscillator frequency limits for low-noise (radio) applications. The MAX730A accepts inputs between 5.2V and 11V and delivers 450mA for inputs above 6V. Typical efficiencies are 85% to 96%. Quiescent supply current is 1.7mA and only 6µA 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. These regulators require only a single inductor value to work in most applications, so no inductor design is necessary.

The MAX730A/MAX738A/MAX744A also feature cycle-by-cycle current limiting, overcurrent limiting, undervoltage lockout, and programmable soft-start protection.

Simplified Block Diagram

MAX730A, MAX738A, MAX744A: Typical Operating Circuit MAX730A, MAX738A, MAX744A: 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 .