LT3957AEUHE#PBF

LT3957A is a wide input range, current mode DC/DC converter which is capable of generating either positive or negative output voltages. It can be configured as either a boost, flyback, SEPIC or inverting converter. It features an internal low side N-channel power MOSFET rated for 40V at 5A and driven from an internal regulated 5.2V supply. The fixed frequency, current-mode architecture results in stable operation over a wide range of supply and output voltages. The operating frequency of device can be set with an external resistor over a 100KHz to 1MHz range, and can be synchronized to an external clock using the SYNC pin. A minimum operating supply voltage of 3V, and a low shutdown quiescent current of less than 1μA, make the device ideally suited for battery-powered systems. It features soft-start and frequency foldback functions to limit inductor current during start-up. It is used in application such as automotive, telecom, industrial etc.

• Wide input voltage range is 3V to 40V
• Single feedback pin for positive or negative output voltage
• Current mode control provides excellent transient response
• Synchronizable to an external clock
• Internal 5.2V low dropout voltage regulator
• Programmable input undervoltage lockout with hysteresis
• Programmable soft-start
• Switching frequency is 100KHz typ at (RT = 140K to SGND, FBX = 1.6V, VC = 1.5V)
• Low shutdown current is 1μA max at (EN/UVLO = 0V, TA ≈ TJ = 25°C, VIN = 24V)
• Operating temperature is -40°C to 125°C, package style is 36-lead plastic QFN

Notes

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