LA5759 - ON Semiconductor

LA5759 Separately-excited Step-down Switching Regulator

of Functional Settings 1. Calculation equation to set the output voltage This IC controls the switching output so that the VOS pin voltage becomes 1.26V (typ). The equation to set the output voltage is as follows: VO = 1+ R2 R1 × 1.26V(typ) The VOS pin has the inrush current of 1μA (typ). Therefore, the error becomes larger when R1 and R2 resistance val.

Features

• Output smoothing condenser can use a Low ESR condenser for the reliability improvement
• High efficiency
• Four external parts
• Time-base generator (80kHz) incorporated
• Current limiter incorporated
• Thermal shutdown circuit incorporated
• Soft start circuit incorporated Specifications Maximum Ratings at Ta = 25°C Parameter Input voltage SW pin application reverse Allowable power dissipation Operating temperature Storage temperature Symbol VIN max VSW Pd max1 Pd max2 Topr Tstg Conditions Infinite heat sink. No heat sink. Ratings 34 -1 7.5 1.75 -30 to +125 -40 to +150 Unit V V W W °C.