LT3991IMSE-3.3#PBF

LT3991IMSE-3.3#PBF is an adjustable frequency monolithic buck-switching regulator that accepts a wide input voltage range of up to 55V. Low quiescent current design consumes only 2.8µA of supply current while regulating with no load. Low ripple Burst Mode operation maintains high efficiency at low output currents while keeping the output ripple below 15mV in a typical application. An internally compensated current mode topology is used for fast transient response and good loop stability. A high-efficiency 0.44 ohm switch is included on the die along with a boost Schottky diode and the necessary oscillator, control, and logic circuitry. An accurate 1V threshold enable pin can be used to shut down the LT3991, reducing the input supply current to 700nA. A capacitor on the SS pin provides a controlled inrush current (soft-start). Applications include automotive battery regulation, power for portable products, industrial supplies.

• Wide input voltage range from 4.3V to 55V, fast transient response
• Accurate 1V enable pin threshold, power good flag
• Soft-start capability, internal compensation, 3.3V output voltage
• Quiescent current from VIN is 0.7μA typical at (VEN low, TA = 25°C)
• Switching frequency is 2MHz typical at (RT = 11K, TA = 25°C)
• Minimum switch on time is 110ns typical at (TA = 25°C)
• Switch current limit is 2.3A typical at (TA = 25°C)
• Switch VCESAT is 440mV typical at (ISW = 1A, TA = 25°C)
• EN voltage hysteresis is 30mV typical at (TA = 25°C)
• Operating junction temperature range from -40°C to 125°C, 10-lead plastic MSOP package

Notes

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