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Analog Devices LT3922 | Demoboard DN557
Low EMI LED Driver Features 2A, 40V, Integrated, Synchronous Switches for Automotive Lighting
Overview
| Topology | Buck-Boost Converter |
| Input voltage | 4-18 V |
| Output 1 | 16 V / 0.33 A |
Description
The breadth of LED applications has grown to encompasseverything from general lighting to automotive,industrial and test equipment, sign boards and safetyinstruments. Feature requirements for LED drivershave become more extensive. The latest LED solutionsrequire drivers that are compact, efficient, lownoise, and have high dimming ratios and advancedfault protection. The LT3922 meets these demands.The LT3922 synchronous LED driver with integrated2A, 40V switches can be configured as a boost, buckor boost-buck LED driver. Its high efficiency integratedswitches fit into a tiny 4mm × 5mm QFN package. Thisdevice integrates Linear’s most advanced switchingtechnologies, condensing high power capability intotight spaces while controlling the edge rates and mitigatingunwanted EMI. The LT3922 features controlledswitching edges that do not ring—offering just theright balance of high efficiency and low noise. Theycan be run at up to 2.5MHz for compact solutions.The tiny LT3922 LED driver features low EMI, highefficiency and fault protection required in automotiveenvironments. It can handle 36V automotivetransients and 3V cold crank. Its Silent Switcher®architecture, spread spectrum frequency modulation(SSFM) and controlled switching edges makeit ideal for powering LEDs with low EMI. Its flexibletopology is useful in daytime running lights, signallights, taillights, and headlight segments as well asdashboard and heads-up displays with high dimmingratios. Built-in fault protection reduces the number ofextra components required to protect against shortand open LEDs.
More information
Products
Order Code | Datasheet | Simulation | Downloads | Status | Product series | Z @ 100 MHz(Ω) | Zmax(Ω) | Test Condition Zmax | IR 2(mA) | RDC max.(Ω) | Type | L1(µH) | L2(µH) | IR(mA) | ISAT(A) | RDC1 typ(Ω) | RDC2 typ(Ω) | RDC1 max(Ω) | RDC2 max(Ω) | fres(MHz) | SamplesAvailability & Sample | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | SPECWE-CBF SMT EMI Suppression Ferrite Bead, 600 Ω, 700 Ω | Availability – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-CBF SMT EMI Suppression Ferrite Bead | Impedance @ 100 MHz600 Ω | Maximum Impedance700 Ω | Maximum Impedance150 MHz | Rated Current 22000 mA | DC Resistance0.15 Ω | TypeHigh Current | Inductance 152000000 µH | – | Rated Current1500 mA | – | – | – | – | – | – | –Check availability | |||
| SPECWE-CBF SMT EMI Suppression Ferrite Bead, 1500 Ω, 1800 Ω | Availability – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-CBF SMT EMI Suppression Ferrite Bead | Impedance @ 100 MHz1500 Ω | Maximum Impedance1800 Ω | Maximum Impedance70 MHz | Rated Current 21000 mA | DC Resistance0.3 Ω | TypeHigh Current | – | – | Rated Current700 mA | – | – | – | – | – | – | –Check availability | |||
 | SPECWE-DD SMT Shielded Coupled Inductor, –, – | Availability – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-DD SMT Shielded Coupled Inductor | – | – | – | Rated Current 21100 mA | DC Resistance0.12 Ω | TypeStraight | Inductance 110 µH | Inductance 210 µH | Rated Current1100 mA | Saturation Current2.8 A | DC Resistance 10.11 Ω | DC Resistance 20.11 Ω | DC Resistance 10.12 Ω | DC Resistance 20.12 Ω | Self Resonant Frequency27 MHz | –Check availability |
| Expected Availability | Opening inventory | Quantity |
|---|---|---|
| Current Availability | – | – |