| Distributor | Stock | Pricing | MOQ | PKG | Lead Time | Date Code | On Order Quantity | On Order Delivery | |
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4,488 pcs
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4488 pcs | On Request | 1 | On Request | On Request | 19+ | On Request | On Request |
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| AEC Qualified | |
| Automotive Grade | |
| Industrial Grade | |
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| Medical Grade | |
| Military Grade | |
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| SVHC Present | |
| Tape & Reel |
The LT3991EMSE#PBF is a monolithic buck switching regulator from LT, designed for a wide input voltage range up to 55V. It offers ultralow quiescent current of 2.8µA while regulating with no load, and maintains high efficiency at low output currents with its low ripple Burst Mode operation, keeping output ripple below 15mV.
Key electrical specifications include a maximum output current of 1.2A, an adjustable switching frequency from 200kHz to 2MHz, and a fast transient response due to its internally compensated current mode topology. It also features an accurate 1V enable pin threshold for shutdown, reducing supply current to 700nA, and a power good flag that signals when the output voltage reaches 91% of the programmed level.
This regulator includes a high efficiency 0.44Ω saturating switch and a boost Schottky diode on-chip. It is available in small, thermally enhanced 10-pin MSOP and 3mm x 3mm DFN packages with exposed pads for improved thermal performance. The soft-start capability is managed by a capacitor on the SS pin, providing controlled inrush current.
Applications for the LT3991EMSE#PBF include automotive battery regulation, power for portable products, and industrial supplies. Its wide input voltage range and low quiescent current make it suitable for various power management needs.
The LT3991EMSE#PBF is available in both MSOP and DFN packages, each measuring 3mm x 3mm with 10 pins.
The input voltage range is 4.3V to 55V.
The maximum output current is 1.2A.
The typical quiescent current is 2.8µA when regulating 12VIN to 3.3VOUT.
Yes, the switching frequency is adjustable from 200kHz to 2MHz and can be synchronized between 250kHz and 2MHz.
The output voltage can be adjusted from 1.19V to 30V.
The typical shutdown current is 700nA.