Datasheet Linear Technology LT1619

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Design Notes

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  LT1619: Tiny Boost Controller Provides Efficient Solutions for Low Voltage Inputs &mdash DN255
  PDF, 78 Kb, File published: Apr 2, 2001
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  advertisement Tiny Boost Controller Provides Efficient Solutions
  for Low Voltage Inputs – Design Note 255
  Keith Szolusha The LT1619 provides a complete solution for low input
  voltage applications that require low side MOSFET drive.
  It is a 300kHz, current mode PWM controller capable
  of operating from inputs ranging from 1.9V to 18V. The
  rail-to-rail, 1A MOSFET driver is capable of driving an
  external MOSFET gate to within 350mV of the supply
  rail and to within 100mV of ground. Bootstrapping the
  driver supply pin (DRV) to the output enables the power
  supply to operate from input voltages as low as 1.9V yet
  still drive the MOSFET gate voltage high enough for full
  enhancement. The 53mV low side current limit threshold R2
  12.4k R1
  37.4k 1
  2
  3 220pF 75k 4 S/S VIN FB DRV
  LT1619 VC
  GND GATE
  SENSE 15nF 8
  7
  6
  5 + …

Articles

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  LT1619 Boost Controller Provides Efficient Solutions for Low Voltage Inputs &mdash LT Journal
  PDF, 180 Kb, File published: Sep 1, 2000
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  DESIGN FEATURES LT1619 Boost Controller Provides
  Efficient Solutions for
  by Bing Fong Ma and
  Low Voltage Inputs Kurk Mathews Introduction
  As logic voltages continue to fall, it is
  increasingly common to find a high
  current, low voltage (3.3V or less)
  supply satisfying a large portion of a
  circuit’s power requirement. While
  this, in itself, is not a problem, generating subsequent voltages at even
  moderate currents from such a low
  voltage source can be challenging.
  Selecting a topology such as the boost,
  SEPIC or flyback converter is the easy
  part. Unfortunately, finding a switching regulator controller or MOSFET
  that works well at low voltages has
  been difficult until now.
  The new LT1619 provides a complete solution for low voltage and other
  applications requiring low-side MOS
  power transistors. The LT1619 is a
  300kHz (externally synchronizable to
  frequencies as high as 500kHz) current mode PWM controller capable of
  operating from inputs ranging from …

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Manufacturer's Classification

• Power Management > Switching Regulator > SEPIC Regulators
• Power Management > Switching Regulator > Step-Up (Boost) Regulators > External Power Switch Boost