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28V, PWM, Step-Up DC-DC Converter

High-Voltage, High Current Step-Up in QSOP Also Offers SEPIC and Flyback Topologies

Product Details

Key Features

Parametric specs for Step-Up Switching Regulators
VIN (V) (min) 3
VIN (V) (max) 28
VOUT1 (V) (min) 3
VOUT1 (V) (max) 28
IOUT1 (A) (max) 0.5
Switch Type Internal
Preset VOUT (V) 12
Output Adjust. Method Resistor
IQ (mA) (typ) 0.5
Shutdown Mode Supply Current (µA) (typ) 3
Shutdown Mode Supply Current (µA) (max) 8
# DC-DC Outputs 1
Switching Frequency (kHz) 250
Package/Pins QSOP/16
Budgetary
Price (See Notes)
4.26
View Less

Simplified Block Diagram

Technical Docs

Data Sheet 28V, PWM, Step-Up DC-DC Converter Apr 16, 2015

Support & Training

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Parameters

Parametric specs for Step-Up Switching Regulators
VIN (V) (min) 3
VIN (V) (max) 28
VOUT1 (V) (min) 3
VOUT1 (V) (max) 28
IOUT1 (A) (max) 0.5
Switch Type Internal
Preset VOUT (V) 12
Output Adjust. Method Resistor
IQ (mA) (typ) 0.5
Shutdown Mode Supply Current (µA) (typ) 3
Shutdown Mode Supply Current (µA) (max) 8
# DC-DC Outputs 1
Switching Frequency (kHz) 250
Package/Pins QSOP/16
Budgetary
Price (See Notes)
4.26

Key Features

  • Adjustable Output Voltage Up to +28V
  • Up to 93% Efficiency
  • Wide Input Voltage Range (+3V to +28V)
  • Up to 500mA Output Current at +12V
  • 500µA Quiescent Supply Current
  • 3µA Shutdown Current
  • 250kHz Switching Frequency
  • Small 1W, 16-Pin QSOP Package

Applications/Uses

  • Industrial +24V and +28V Systems
  • LCD Displays
  • Palmtop Computers

Description

The MAX618 CMOS, PWM, step-up DC-DC converter generates output voltages up to 28V and accepts inputs from +3V to +28V. An internal 2A, 0.3Ω switch eliminates the need for external power MOSFETs while supplying output currents up to 500mA or more. A PWM control scheme combined with Idle Mode™ operation at light loads minimizes noise and ripple while maximizing efficiency over a wide load range. No-load operating current is 500µA, which allows efficiency up to 93%.

A fast 250kHz switching frequency allows the use of small surface-mount inductors and capacitors. A shutdown mode extends battery life when the device is not in use. Adaptive slope compensation allows the MAX618 to accommodate a wide range of input and output voltages with a simple, single compensation capacitor.

The MAX618 is available in a thermally enhanced 16-pin QSOP package that is the same size as an industry-standard 8-pin SO but dissipates up to 1W. An evaluation kit (MAX618EVKIT) is available to help speed designs.

Simplified Block Diagram

MAX618: Typical Operating Circuit MAX618: Typical Operating Circuit Zoom icon

Technical Docs

Data Sheet 28V, PWM, Step-Up DC-DC Converter Apr 16, 2015

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 .