LT3844 - High Voltage, Current Mode Switching Regulator Controller with Programmable Operating Frequency
- High Voltage Operation: Up to 60V
- Output Voltages up to 36V (Step-Down)
- Programmable Constant Frequency: 100kHz to 500kHz
- Synchronizable up to 600kHz
- Burst Mode® Operation: 120µA Supply Current
- 10µA Shutdown Supply Current
- ±1.3% Reference Accuracy
- Drives N-Channel MOSFET
- Programmable Soft-Start
- Programmable Undervoltage Lockout
- Internal High Voltage Regulator for Gate Drive
- Thermal Shutdown
- Current Limit Unaffected by Duty Cycle
- 16-Pin Thermally Enhanced TSSOP Package
The LT3844 is a DC/DC controller used for medium power, low part count, high efficiency supplies. It offers a wide 4V-60V input range (7.5V minimum startup voltage) and can implement step-down, step-up, inverting and SEPIC topologies.
The LT3844 includes Burst Mode operation, which reduces quiescent current below 120µA and maintains high efficiency at light loads. An internal high voltage bias regulator allows for simple biasing.
Additional features include current mode control for fast line and load transient response; programmable fixed operating frequency that can be synchronized to an external clock for noise sensitive applications; a gate driver capable of driving large N-channel MOSFETs; a precision undervoltage lockout function; 10µA shutdown current; short-circuit protection and a programmable soft-start function.
The LT3844 is available in a 16-lead thermally enhanced TSSOP package.
PackagingFor complete and up to date package information and drawings, please refer to our packaging page
- Part numbers ending in PBF are lead free. Please contact LTC marketing for information on lead based finish parts.
- Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
- Please refer to our general ordering information or the product datasheet for more details
Package Variations and Pricing
|Part Number||Package||Pins||Temp||Price (1-99)||Price (1k)*||RoHS Data|
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Demo BoardsLinear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.
|DC974A||LT3844EFE Demo Board | 15V ≤ VIN ≤ 60V, Vout = 12V @ 4.2A||$150.00|
- Industrial Power Distribution
- 12V and 42V Automotive and Heavy Equipment
- High Voltage Single Board Systems
- Distributed Power Systems
- Telecom Power
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The LTpowerCAD II design tool is a complete power supply design tool program that can significantly ease the tasks of power supply design. It guides users to a solution, selects power stage components, provides detailed power efficiency, shows quick loop bode plot stability and load transient analysis, and can export a final design to LTspice for simulation. Click here to download LTpowerCAD
Design tools for the following parts are available in LTpowerCAD:
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