LT1956EGN#PBF

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 SSOP package

Notes

ADI products are only authorized (and sold) for use by the customer and are not to be resold or otherwise passed on to any third party