LT3957IUHE#PBF

LT3957IUHE#PBF is a wide input range, current mode DC/DC converter capable of generating positive or negative output voltages. It can be configured as a boost, flyback, SEPIC, or inverting converter. The device features an internal low-side N-channel power MOSFET rated for 40V at 5A, driven from an internally regulated 5.2V supply. Its fixed-frequency, current-mode architecture ensures stable operation over a wide range of supply and output voltages. The operating frequency of the LT3957 can be set with an external resistor across a 100KHz to 1 MHz range and synchronized to an external clock using the SYNC pin. With a minimum operating supply voltage of 3V and low shutdown quiescent current of less than 1μA, the LT3957 is well-suited for battery-powered systems. It also incorporates soft-start and frequency foldback functions to limit inductor current during startup. Applications include automotive, telecom, and industrial uses.

• Wide input voltage range from 3V to 40V, programmable soft-start
• Single feedback pin for positive or negative output voltage
• Current mode control provides excellent transient response, synchronizable to an external clock
• Programmable input undervoltage lockout with hysteresis
• Switching frequency is 100KHz typical at (RT = 140K to SGND, FBX = 1.6V, VC = 1.5V, TA ≈ TJ = 25°C)
• INTVCC current limit is 40mA typical at (VIN = 40V, TA ≈ TJ = 25°C)
• Dropout voltage (VIN – VINTVCC) is 450mV typ at (VIN = 5V, IINTVCC = 20mA, VC = 0V, TA ≈ TJ = 25°C)
• VC source current is -15μA typ at (VC = 1.5V, FBX = 0V, current out of pin, TA ≈ TJ = 25°C)
• VIN operating IQ is 1.7mA typical at (VC = 0.3V, RT = 41.2K, TA ≈ TJ = 25°C)
• Operating junction temperature range from -40°C to 125°C, 36-lead plastic QFN 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