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LTC1174 LTC1174

Application Notes

• Download
  Linear Technology Magazine Circuit Collection, Volume II &mdash AN66
  PDF, 1.1 Mb, File published: Aug 1, 1996
  Application Note 66 is a compendium of "power circuits" from the first five years of Linear Technology. This application note contains circuits that can power most any system you can imagine, from desktop computer systems to micropower systems for portable and handheld equipment. Also included here are circuits that provide 300W or more of power factor corrected DC from a universal input. Battery chargers are included, some that charge several battery types, some that are optimized to charge a single type. MOSFET drivers, high side switches and H-bridge driver circuits are also included, as is an article on simple thermal analysis.
  Extract from the document

  Application Note 66
  August 1996 Linear Technology Magazine Circuit Collection, Volume II
  Power Products
  Richard Markell, Editor
  INTRODUCTION
  Application Note 66 is a compendium of “power circuits”
  from the first five years of Linear Technology. The objective
  is to collect the useful circuits from the magazine into
  several applications notes (another, AN67, will collect
  signal processing circuits into one Application Note) so
  that valuable “gems” will not be lost. This Application Note
  contains circuits that can power most any system you can
  imagine, from desktop computer systems to micropower
  systems for portable and handheld equipment. Also included here are circuits that provide 300W or more of
  power factor corrected DC from a universal input. Battery
  chargers are included, some that charge several battery
  types, some that are optimized to charge a single type.
  MOSFET drivers, high side switches and H-bridge driver
  circuits are also included, as is an article on simple thermal
  analysis. With these introductory remarks, I’ll stand aside
  and let the authors describe their circuits. ARTICLE INDEX
  REGULATORS—SWITCHING (BUCK)
  High Power (>4A) …

Design Notes

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  A Simple High Efficiency, Step-Down Switching Regulator &mdash DN73
  PDF, 78 Kb, File published: Aug 1, 1993
  Extract from the document

  advertisement A Simple High Efficiency, Step-Down Switching Regulator
  Design Note 73
  San-Hwa Chee To help the user get the most out of their battery source,
  the internal 0.9О© (at supply voltage of 9V) power
  P-channel MOSFET switch is turned on continuously
  (DC) at dropout. In addition, an active low shutdown
  pin is included to power down the LTC1174, reducing
  the no load quiescent current from 130ОјA to just 1ОјA.
  An on-chip low battery detector is also included, with
  the trip point set by two external resistors.
  Figure 1 shows a typical LTC1174 surface mount application. It provides 5V at 175mA from an input voltage
  range of 5.5V to 12.5V. Figure 2 shows the circuit’s
  efficiency approaching 93% at an input voltage of 9V.
  Peak inductor current is limited to 340mA by connecting
  Pin 7 (IPGM) to ground. The advantages of controlling
  the inductor’s current include: excellent line and load
  transient response, short-circuit protection and controlled start-up current. load current is increased to 425mA. Figure 3 shows
  the resulting circuit. Note that all components remain
  the same as in Figure 1. The new efficiency curve is
  shown in Figure 4.
  L, LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered
  trademarks of Linear Technology Corporation. All other trademarks are the property
  of their respective owners. …

• Download
  Techniques for Deriving 3.3V from 5V Supplies &mdash DN74
  PDF, 73 Kb, File published: Sep 1, 1993
  Extract from the document

  advertisement Techniques for Deriving 3.3V from 5V Supplies – Design Note 74
  Mitchell Lee
  Microprocessor chip sets and logic families that operate from 3.3V supplies are gaining acceptance in both
  desktop and portable computers. Computing rates, and
  in most cases, energy consumed by these circuits show
  a strong improvement over 5V technology. The main
  power supply in most systems is still 5V, necessitating
  a local 5V to 3.3V regulator.
  Linear regulators are viable solutions at lower (IO ≤ 1A)
  currents, but they must have a low dropout voltage in
  order to maintain regulation with a worst-case input
  5 4.5V TO 5.5V IN OUT 1 + LT1129-3.3
  4 SHUTDOWN SENSE 2 GND 3.3V OUT
  700mA
  3.3ОјF
  SOLID TANTALUM of only 4.5V. Figure 1 shows a circuit that converts a
  4.5V minimum input to 3.3V with an output tolerance
  of only 3% (100mV). The LTВ®1129-3.3 can handle up to
  700mA in surface mount configurations, and includes
  both 16ОјA shutdown and 50ОјA standby currents for
  system sleep modes. Unlike other linear regulators, the
  LT1129-3.3 combines both low dropout and low voltage
  operation. Small input and output capacitors facilitate …

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  Ultra-Low Power, High Efficiency DC/DC Converter Operates Outside the Audio Band &mdash DN86
  PDF, 73 Kb, File published: Sep 1, 1994
  Extract from the document

  advertisement Ultra-Low Power, High Efficiency DC/DC Converter
  Operates Outside the Audio Band – Design Note 86
  Mitchell Lee
  Portable communications products are densely
  packed with signal processing, microprocessor, radio
  frequency, and audio circuits. Digital clock noise must
  be eliminated not only from the audio sections, but
  also from the antenna which, by the very nature of the
  product, is located only inches from active circuitry.
  If a switching regulator is used in the power supply, it
  becomes another source of noise. The LTC ®1174 stepdown converter is designed specifically to eliminate
  noise at audio frequencies while maintaining high
  efficiency at low output currents.
  Figure 1 shows an all surface mount solution for a 5V,
  120mA output derived from 5 to 7 NiCd or NiMH cells.
  Small input and output capacitors that are capable of
  handling the necessary ripple currents help conserve
  space. In applications where shutdown is desired this
  feature is available (otherwise short this pin to VIN).
  The LTC1174’s internal switch, connected between
  VIN and VSW, is current controlled at a peak of approximately 340mA. Low peak switch current is one
  of the key features that allows the LTC1174 to minimize
  system noise compared to other chips which carry …

• Download
  5V to 3.3V Circuit Collection &mdash DN91
  PDF, 74 Kb, File published: Nov 1, 1994
  Extract from the document

  advertisement 5V to 3.3V Circuit Collection – Design Note 91
  Richard Markell and Craig Varga
  High Efficiency 3.3V Regulator
  INPUT
  VOLTAGE
  5V + 6
  VIN
  7
  3 IPGM SHDN 8 3.3V Battery-Powered Supply with Shutdown
  8 3w
  22ОјF*
  25V LBIN 50μH† GND 1N5818 + 2w
  47ОјF**
  16V 4 * AVX TPSD226K025
  ** AVX TPSD476K016
  † COILTRONICS CTX50-4 OUT 1 LT1121-3.3 5V
  5 1
  VOUT
  LTC1174-3.3
  2
  5
  LBOUT
  SW IN 0.1ОјF + 1ОјF …

Model Line

Manufacturer's Classification

• Power Management > Switching Regulator > Inverting Regulators
• Power Management > Switching Regulator > Step-Down (Buck) Regulators > Internal Power Switch Buck