LT3844
PRODUCTIONHigh Voltage, Current Mode Switching Regulator Controller with Programmable Operating Frequency
- Part Models
- 4
- 1ku List Price
- Starting From $4.71
Overview
- 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 to 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.
Applications
- Industrial Power Distribution
- 12V and 42V Automotive and Heavy Equipment
- High Voltage Single Board Systems
- Distributed Power Systems
- Avionics
- Telecom Power
Documentation
Data Sheet 1
User Guide 1
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.
| Part Model | Pin/Package Drawing | Documentation | CAD Symbols, Footprints, and 3D Models |
|---|---|---|---|
| LT3844EFE#PBF | 16-Lead TSSOP w/ EP | ||
| LT3844EFE#TRPBF | 16-Lead TSSOP w/ EP | ||
| LT3844IFE#PBF | 16-Lead TSSOP w/ EP | ||
| LT3844IFE#TRPBF | 16-Lead TSSOP w/ EP |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
May 18, 2026 - 26_0072 Epoxy Change for Select TSSOP Products |
||
| LT3844EFE#PBF | PRODUCTION | |
| LT3844EFE#TRPBF | PRODUCTION | |
| LT3844IFE#PBF | PRODUCTION | |
| LT3844IFE#TRPBF | PRODUCTION | |
|
Apr 6, 2022 - 22_0068 Laser Top Mark for ETSSOP and TSSOP Packages Assembled in ADPG [PNG] and UTL |
||
| LT3844EFE#PBF | PRODUCTION | |
| LT3844EFE#TRPBF | PRODUCTION | |
| LT3844IFE#PBF | PRODUCTION | |
| LT3844IFE#TRPBF | PRODUCTION | |
This is the most up-to-date revision of the Data Sheet.
Software Resources
Can't find the software or driver you need?
Request a Driver/SoftwareHardware Ecosystem
| Parts | Product Life Cycle | Description |
|---|---|---|
| Circuit Monitors 1 | ||
| LTC2960 | RECOMMENDED FOR NEW DESIGNS | 36V Nano-Current Two-Input Voltage Monitor |
| Hot Swap Controllers 1 | ||
| LT4363 | RECOMMENDED FOR NEW DESIGNS | High Voltage Surge Stopper with Current Limit |
| Oscillators 1 | ||
| LTC6909 | PRODUCTION | 1 to 8 Output, Multiphase Silicon Oscillator with Spread Spectrum Modulation |
| Power System Management (PSM) & Sequencers 1 | ||
| LTC2974 | RECOMMENDED FOR NEW DESIGNS | 4-Channel PMBus Power System Manager Featuring Accurate Output Current Measurement |
Tools & Simulations
LTspice 1
Models for the following parts are available in LTspice:
- LT3844
LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.
Evaluation Kits
LT3844EFE Demo Board | 15V ≤ VIN ≤ 60V, VOUT = 12V @ 4.2A