Linear Technology extends its family of DC/DC uModule regulator systems with products that can regulate an output voltage from a variable input voltage greater than, less than or equal to the output voltage.

The LTM4605 is the first device in a new family of buck-boost products and operates from 4.5VIN to 20VIN, regulates an output voltage from 0.8V to16V and delivers an output power up to 150W.

The LTM4605 integrates a synchronous buck-boost DC/DC controller, four N-channel MOSFETs, input and output bypass capacitors and the compensation circuitry in a 15mm x 15mm x 2.8mm land grid array (LGA) plastic molded package. Only an inductor, feedback and sense resistors and bulk capacitors are required to implement a very low profile, compact and high efficiency design. The LTM4605 provides a compact regulator solution in applications such as networking, industrial and automotive systems and high-power battery operated devices.

With the LTM4605's on-board proprietary 4-switch synchronous MOSFET design, the product achieves up to 97.3% efficiency in boost mode and up to 97.7 per cent efficiency in buck mode (VIN: 4.5V to 20V, VOUT: 12V, IOUT: 5A). Whereas other topologies such as SEPIC (Single Ended Primary Inductor Converter) require as many as 20 components and custom magnetics, this buck-boost uModule solution uses only eight components and an off-the-shelf inductor.

In addition, the efficiency of a comparable SEPIC circuit is approximately 76 per cent to 84 per cent. Furthermore, to reduce undesirable frequency harmonics, the LTM4605 is phase-lockable to an external clock frequency ranging from 200kHz to 400kHz. Safety features include overvoltage and foldback current protection.

The LTM4605 is offered for operation from -40ºC to 85ºC temperature range. 1,000-piece pricing starts at $18.85 each. 

Summary of Features: LTM4605 

• Single Inductor Buck-Boost Architecture 
   
• Synchronous 4-Switch Operation for High Efficiency (up to 98 per cent)
  
• Wide Input Voltage Range: 4.5V to 20V  
  
• Wide Output Voltage Range: 0.8V to 16V
  
• 1 per cent Set Point Output Voltage Accuracy 
  
• 15mm x 15mm x 2.8mm LGA Package

Contact information

Alastair Boyd, Area Sales Manager UK, Ireland, South Africa and Israel, Linear Technology (UK) Limited.
3 The Listons, Liston Road, Marlow, Buckinghamshire SL7 1FD
Tel: +44 (0)1628 477066  Fax: +44 (0)1628 478153  www.linear.com Email: aboyd@linear.com