Datasheet Linear Technology LT3507

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Design Notes

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  Compact Triple Step-Down Regulator Offers LDO Driver and Output Tracking and Sequencing &mdash DN441
  PDF, 127 Kb, File published: Apr 16, 2008
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  Compact Triple Step-Down Regulator Offers LDO Driver and
  Output Tracking and Sequencing – Design Note 441
  Tiger Zhou
  Introduction
  Typical industrial and automotive applications require
  multiple high current, low voltage power supplies to
  drive everything from disk drives to microprocessors.
  The LTВ®3507 triple step-down converter п¬Ѓts easily into
  these applications. It is simple and compact compared
  to multi-chip solutions.
  The LT3507 is a single IC current mode triple stepdown regulator with internal power switches and a low
  dropout linear regulator driver. The switching converters are capable of generating one 2.4A output and two
  1.5A outputs. All three converters are synchronized to a
  single oscillator, with the 2.4A output running antiphase
  to the other two converters, thereby reducing input ripple
  current. Each converter has independent shutdown and
  soft-start circuits and generates a power good signal
  when its output is in regulation, simplifying both supply
  sequencing and the interface with microcontrollers and
  DSPs. Separate input pins for each regulator offer additional flexibility; regulators can be cascaded to reduce
  circuit size, or each regulator can draw power from a
  different input source.
  The switching frequency is set with a single resistor …

Articles

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  Quad Output Regulator Meets Varied Demands of Multiple Power Supplies &mdash LT Journal
  PDF, 284 Kb, File published: Jun 17, 2008
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  DESIGN FEATURES L Quad Output Regulator Meets Varied
  Demands of Multiple Power Supplies
  by Michael Nootbaar Introduction
  Many modern electronic devices require a number of power domains to
  satisfy the needs of a wide variety of devices and subsystems. A power supply
  designer’s job would be relatively easy
  if the design contraints were limited to
  simply providing well-regulated voltages, but power supply requirements
  are typically much more complicated.
  For example, multiple power rails must
  be sequenced and/or track each other
  to ensure proper system behavior.
  High power sections of the design
  are often powered down when not
  in use, requiring multiple shutdown
  options. Powering analog circuitry
  adds the demand for clean, low noise
  supplies—no switching transients
  or excessive voltage ripple allowed.
  And, of course, all supplies must be generated as efficiently as possible to
  minimize power consumption.
  The LT3507 meets these requirements by combining three switching
  regulators and a low dropout linear …

Model Line

Manufacturer's Classification

• Power Management > Switching Regulator > Step-Down (Buck) Regulators > Multiple Output Buck | Internal Power Switch Buck | Buck Regulator Plus LDO
• Power Management > PMIC & Multifunction > Multitopology DC/DC
• Space & Harsh Environment > Extended Temperature Plastic (H & MP) > Extended Temperature (H & MP) Switching Regulators