Features

• 4-Switch Single Inductor Architecture Allows V_IN Above, Below or Equal to V_OUT
• Synchronous Switching: Up to 98.5% Efficiency
• Wide V_IN Range: 4.7V to 60V
• 2% Output Voltage Accuracy: 1.2V ≤ V_OUT < 60V
• 6% Output Current Accuracy: 0V ≤ V_OUT < 60V
• Input and Output Current Regulation with Current Monitor Outputs
• No Top FET Refresh in Buck or Boost
• V_OUT Disconnected from V_IN During Shutdown
• C/10 Charge Termination and Output Shorted Flags
• Capable of 100W or greater per IC
• 38-Lead TSSOP with Exposed Pad

Typical Application

Description

The LT®3791-1 is a synchronous 4-switch buck-boost voltage/ current regulator controller. The controller can regulate output voltage, output current, or input current with input voltages above, below, or equal to the output voltage. The constant-frequency, current mode architecture allows its frequency to be adjusted or synchronized from 200kHz to 700kHz. No top FET refresh switching cycle is needed in buck or boost operation. With 60V input, 60V output capability and seamless transitions between operating regions, the LT3791-1 is ideal for voltage regulator, battery/ super-capacitor charger applications in automotive, industrial, telecom, and even battery-powered systems.

The LT3791-1 provides input current monitor, output current monitor, and various status flags, such as C/10 charge termination and shorted output flag.