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Adjustable, PWM, Step-Down Regulator

We Recommend Improved Performance Devices, MAX887 for MAX750A, MAX1684/MAX1685 for MAX758A, for New Designs

Product Details

Key Features

Parametric specs for Step-Down Switching Regulators
VIN (V) (min) 4
VIN (V) (max) 16
VOUT1 (V) (min) 1.25
VOUT1 (V) (max) 16
IOUT1 (A) (max) 0.75
Switch Type Internal
Output Adjust. Method Resistor
# DC-DC Outputs 1
Switching Frequency (kHz) 190
Package/Pins PDIP/8
SOIC (W)/16
Budgetary
Price (See Notes)
3.76
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Simplified Block Diagram

Technical Docs

Data Sheet Adjustable, PWM, Step-Down Regulator Oct 01, 1993

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Parameters

Parametric specs for Step-Down Switching Regulators
VIN (V) (min) 4
VIN (V) (max) 16
VOUT1 (V) (min) 1.25
VOUT1 (V) (max) 16
IOUT1 (A) (max) 0.75
Switch Type Internal
Output Adjust. Method Resistor
# DC-DC Outputs 1
Switching Frequency (kHz) 190
Package/Pins PDIP/8
SOIC (W)/16
Budgetary
Price (See Notes)
3.76

Key Features

  • 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
  • Overcurrent, Soft-Start, and Undervoltage Lockout Protection
  • Cycle-by-Cycle Current Limiting
  • 8-Pin DIP/SO Packages (MAX750A)

Applications/Uses

  • Cell Phones
  • Computer Peripherals
  • Portable Communications Equipment
  • Portable Instrumentation

Description

The MAX750A/MAX758A are adjustable-output, CMOS, step-down, DC-DC switching regulators. The MAX758A 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 subharmonics 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 subharmonic 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.

Simplified Block Diagram

MAX750A, MAX758A: Typical Operating Circuit MAX750A, MAX758A: Typical Operating Circuit Zoom icon

Technical Docs

Data Sheet Adjustable, PWM, Step-Down Regulator Oct 01, 1993

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 .