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LA5771 - Separately-Excited Step-Down Switching Regulator

Description

1.Start delay function The SS pin has the internally-connected 22µA (typ) constant-current supply.

When the voltage of SS pin exceeds the threshold voltage, the regulator starts operation.

As the threshold is 0.62V(typ), the start delay time can be calculated as follows: ex.

Features

  • High efficiency.
  • Four external parts.
  • Time-base generator (160kHz) incorporated.
  • Current limiter incorporated.
  • Thermal shutdown circuit incorporated.
  • Soft start circuit incorporated Specifications Absolute Maximum Ratings at Ta = 25°C Parameter Input voltage Output current SW pin.

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Full PDF Text Transcription

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Ordering number : ENA0718 Monolithic Linear IC LA5771 Overview www.DataSheet4U.com Separately-excited Step-down Switching Regulator (3.3V) The LA5771 is a separately-excited step-down switching regulator (3.3V). Features • High efficiency • Four external parts • Time-base generator (160kHz) incorporated • Current limiter incorporated • Thermal shutdown circuit incorporated • Soft start circuit incorporated Specifications Absolute Maximum Ratings at Ta = 25°C Parameter Input voltage Output current SW pin application reverse voltage Allowable power dissipation Symbol VIN max IO max Vsw Pd max1 Pd max2 Operating temperature Storage temperature Topr Tstg No heat sink Infinite heat sink Conditions Ratings 34 3 -1 1.75 7.
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