Top

28V, Low-Power, High-Voltage, Boost or Inverting DC-DC Converter

Product Details

Key Features

Parametric specs for Inverting Switching Regulators
VIN (V) (min) 2.7
VIN (V) (max) 5.5
VOUT1 (V) (min) -28
VOUT1 (V) (max) 28
IOUT1 (A) (max) 0.5
Switch Type Internal
Output Adjust. Method Resistor
# DC-DC Outputs 1
Alternate Topology Step-Up
Switching Frequency (kHz) 300
Package/Pins SOIC (N)/8
Budgetary
Price (See Notes)
3.72
Parametric specs for Step-Up Switching Regulators
VIN (V) (min) 2.7
VIN (V) (max) 5.5
VOUT1 (V) (max) 28
IOUT1 (A) (max) 0.5
Switch Type Internal
Output Adjust. Method Resistor
IQ (mA) (typ) 0.08
Shutdown Mode Supply Current (µA) (typ) 0.04
Shutdown Mode Supply Current (µA) (max) 1
# DC-DC Outputs 1
Switching Frequency (kHz) 300
Package/Pins SOIC (N)/8
View Less

Simplified Block Diagram

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 .

Sampling:
Selecting the Sample button above will redirect to the third-party ADI Sample Site. The part selected will carry over to your cart on this site once logged in. Please create a new account there if you have never used the site before. Contact SampleSupport@analog.com with any questions regarding this Sample Site.

Parameters

Parametric specs for Inverting Switching Regulators
VIN (V) (min) 2.7
VIN (V) (max) 5.5
VOUT1 (V) (min) -28
VOUT1 (V) (max) 28
IOUT1 (A) (max) 0.5
Switch Type Internal
Output Adjust. Method Resistor
# DC-DC Outputs 1
Alternate Topology Step-Up
Switching Frequency (kHz) 300
Package/Pins SOIC (N)/8
Budgetary
Price (See Notes)
3.72
Parametric specs for Step-Up Switching Regulators
VIN (V) (min) 2.7
VIN (V) (max) 5.5
VOUT1 (V) (max) 28
IOUT1 (A) (max) 0.5
Switch Type Internal
Output Adjust. Method Resistor
IQ (mA) (typ) 0.08
Shutdown Mode Supply Current (µA) (typ) 0.04
Shutdown Mode Supply Current (µA) (max) 1
# DC-DC Outputs 1
Switching Frequency (kHz) 300
Package/Pins SOIC (N)/8

Key Features

  • Internal, 500mA, 28V N-Channel Switch (No External FET Required)
  • Generates Positive or Negative Output Voltages
  • 80µA Supply Current
  • 1µA Max Shutdown Current
  • Up to 300kHz Switching Frequency
  • Adjustable Current Limit Allows Use of Small, Inexpensive Inductors
  • 8-Pin SO Package

Applications/Uses

  • 2-Cell and 3-Cell Battery-Powered Applications
  • High-Efficiency DC-DC Boost Converters
  • Palmtop Computers
  • Positive or Negative LCD Bias Generators
  • Varactor Tuning Diode Bias

Description

The MAX629 low-power DC-DC converter features an internal N-channel MOSFET switch and programmable current limiting. It is designed to supply positive or negative bias voltages up to ±28V from input voltages in the 0.8V to VOUT range, and can be configured for boost, flyback, and SEPIC topologies.

The MAX629's current-limited pulse-frequency-modulation (PFM) control scheme provides high efficiency over a wide range of load conditions. An internal, 0.5A N-channel MOSFET switch reduces the total part count, and a high switching frequency (up to 300kHz) allows for tiny surface-mount magnetics.

The MAX629's combination of low supply current, logic-controlled shutdown, small package, and tiny external components makes it an extremely compact and efficient high-voltage biasing solution that's ideal for battery-powered applications. The MAX629 is available in an 8-pin SO package.

Simplified Block Diagram

 

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 .

Sampling:
Selecting the Sample button above will redirect to the third-party ADI Sample Site. The part selected will carry over to your cart on this site once logged in. Please create a new account there if you have never used the site before. Contact SampleSupport@analog.com with any questions regarding this Sample Site.