LT3991EMSE-5#PBF
ActiveDC-DC SWITCHING BUCK REGULATOR, FIXED, 4.3 TO 55V IN, 5V/1.2A OUT, MSOP-EP-10
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LT3991EMSE-5#PBF
ActiveDC-DC SWITCHING BUCK REGULATOR, FIXED, 4.3 TO 55V IN, 5V/1.2A OUT, MSOP-EP-10
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Technical Specifications
Parameters and characteristics for this part
| Specification | LT3991EMSE-5#PBF |
|---|---|
| Current - Output | 1.2 A |
| Frequency - Switching [Max] | 2 MHz |
| Frequency - Switching [Min] | 200 kHz |
| Function | Step-Down |
| Mounting Type | Surface Mount |
| Number of Outputs | 1 |
| Operating Temperature [Max] | 125 °C |
| Operating Temperature [Min] | -40 C |
| Output Configuration | Positive |
| Package / Case | 10-MSOP, 10-TFSOP, Exposed Pad |
| Supplier Device Package | 10-MSOP-EP |
| Synchronous Rectifier | False |
| Topology | Buck |
| Voltage - Input (Max) [Max] | 55 V |
| Voltage - Input (Min) [Min] | 4.3 V |
| Voltage - Output (Min/Fixed) | 5 V |
LT3991 Series
55V, 1.2A Step-Down Regulator with 2.8μA Quiescent Current
| Part | Function | Supplier Device Package | Number of Outputs | Voltage - Output (Max) [Max] | Voltage - Input (Min) [Min] | Mounting Type | Topology | Output Type | Voltage - Input (Max) [Max] | Current - Output | Output Configuration | Package / Case | Operating Temperature [Min] | Operating Temperature [Max] | Frequency - Switching [Min] | Frequency - Switching [Max] | Synchronous Rectifier | Voltage - Output (Min/Fixed) [Min] | Voltage - Output (Min/Fixed) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 Analog Devices Inc./Maxim Integrated | Step-Down | 10-MSOP-EP | 1 | 30 V | 4.3 V | Surface Mount | Buck | Adjustable | 55 V | 1.2 A | Positive | 10-MSOP 10-TFSOP Exposed Pad | -40 C | 125 °C | 200 kHz | 2 MHz | 1.19 V | ||
 Analog Devices Inc./Maxim Integrated | Step-Down | 10-DFN (3x3) | 1 | 30 V | 4.3 V | Surface Mount | Buck | Adjustable | 55 V | 1.2 A | Positive | 10-WFDFN Exposed Pad | -40 C | 125 °C | 200 kHz | 2 MHz | 1.19 V | ||
Analog Devices Inc./Maxim Integrated | Step-Down | 10-MSOP-EP | 1 | 30 V | 4.3 V | Surface Mount | Buck | Adjustable | 55 V | 1.2 A | Positive | 10-MSOP 10-TFSOP Exposed Pad | -40 C | 125 °C | 200 kHz | 2 MHz | 1.19 V | ||
Analog Devices Inc./Maxim Integrated | Step-Down | 10-MSOP-EP | 1 | 4.3 V | Surface Mount | Buck | 55 V | 1.2 A | Positive | 10-MSOP 10-TFSOP Exposed Pad | -40 C | 125 °C | 200 kHz | 2 MHz | 5 V | ||||
 Analog Devices Inc./Maxim Integrated | Step-Down | 10-MSOP-EP | 1 | 30 V | 4.3 V | Surface Mount | Buck | Adjustable | 55 V | 1.2 A | Positive | 10-MSOP 10-TFSOP Exposed Pad | -40 C | 125 °C | 200 kHz | 2 MHz | 1.19 V | ||
 Analog Devices Inc./Maxim Integrated | Step-Down | 10-DFN (3x3) | 1 | 30 V | 4.3 V | Surface Mount | Buck | Adjustable | 55 V | 1.2 A | Positive | 10-WFDFN Exposed Pad | -40 C | 125 °C | 200 kHz | 2 MHz | 1.19 V | ||
Analog Devices Inc./Maxim Integrated | Step-Down | 10-MSOP-EP | 1 | 4.3 V | Surface Mount | Buck | 55 V | 1.2 A | Positive | 10-MSOP 10-TFSOP Exposed Pad | -40 C | 125 °C | 200 kHz | 2 MHz | 5 V | ||||
Analog Devices Inc./Maxim Integrated | Step-Down | 10-MSOP-EP | 1 | 4.3 V | Surface Mount | Buck | 55 V | 1.2 A | Positive | 10-MSOP 10-TFSOP Exposed Pad | -40 C | 125 °C | 200 kHz | 2 MHz | 5 V | ||||
Analog Devices Inc./Maxim Integrated | Step-Down | 10-DFN (3x3) | 1 | 30 V | 4.3 V | Surface Mount | Buck | Adjustable | 55 V | 1.2 A | Positive | 10-WFDFN Exposed Pad | -40 C | 125 °C | 200 kHz | 2 MHz | 1.19 V | ||
Analog Devices Inc./Maxim Integrated | Step-Down | 10-DFN (3x3) | 1 | 30 V | 4.3 V | Surface Mount | Buck | Adjustable | 55 V | 1.2 A | Positive | 10-WFDFN Exposed Pad | -40 C | 125 °C | 200 kHz | 2 MHz | 1.19 V |
Pricing
Prices provided here are for design reference only. For realtime values and availability, please visit the distributors directly
Description
General part information
LT3991 Series
The LT3991 is an adjustable frequency monolithic buck switching regulator that accepts a wide input voltage range 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 0.44Ω 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). A power good flag signals when VOUTreaches 91% of the programmed output voltage. The LT3991 is available in small 10-pin MSOP and 3mm × 3mm DFN packages with exposed pads for low thermal resistance.ApplicationsAutomotive Battery RegulationPower for Portable ProductsIndustrial Supplies
Documents
Technical documentation and resources