LT1956EFE#TRPBF

LT®1956 is a 500KHz monolithic buck switching regulator with an input voltage capability up to 60V. A high efficiency 1.5A, 0.2ohm switch is included on the die along with all the necessary oscillator, control and logic circuitry. A current mode architecture provides fast transient response and good loop stability. Special design techniques and a new high voltage process achieve high efficiency over a wide input range. Efficiency is maintained over a wide output current range by using the output to bias the circuitry and by utilizing a supply boost capacitor to saturate the power switch. Patented circuitry maintains peak switch current over the full duty cycle range. A shutdown pin reduces supply current to 25µA and the device can be externally synchronized from 580KHz to 700KHz with a logic level input. Typical applications are high voltage, industrial and automotive, portable computers, battery-powered systems, battery chargers, distributed power systems.

• 1.5A peak switch current, saturating switch design: 0.2ohm
• Peak switch current maintained over full duty cycle range
• Effective supply current: 2.5mA, shutdown current: 25µA
• Easily synchronizable, cycle-by-cycle current limiting
• Reference voltage range from 1.204 to 1.234V (5.5V ≤ VIN ≤ 60V)
• EA source current range from 125 to 400µA (FB=1V or VSENSE=4.1V, TJ=25°C, VIN=15V, VC=1.5V)
• Switch frequency range from 460 to 540KHz (VC set to give DC=50%)
• Operating junction temperature range from –40°C to 125°C
• 16-lead plastic TSSOP package

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