Products
LTC3839
RECOMMENDED FOR NEW DESIGNSFast, Accurate, 2-Phase, Single-Output Step-Down DC/DC Controller with Differential Output Sensing
- Part Models
- 4
- 1ku List Price
- Starting From $4.38
Viewing:
Overview
- Wide VIN Range: 4.5V to 38V, VOUT: 0.6V to 5.5V
- ±0.67% Output Voltage Accuracy Over Temperature, Differential Output Voltage Sensing, Allowing Up to ±500mV Line Loss at Remote Ground
- Controlled On-Time, Valley Current Mode Control
- Fast Load Transient Response
- Detect Transient (DTR) Reduces VOUT Overshoot
- Frequency Programmable from 200kHz to 2MHz, Synchronizable to External Clock
- tON(MIN) = 30ns, tOFF(MIN) = 90ns
- Up to 12-Phase Operation
- RSENSE or Inductor DCR Current Sensing
- Overvoltage Protection and Current Limit Foldback
- Power Good Output Voltage Monitor
- Output Voltage Tracking and Adjustable Soft Start-Up
- Thermally Enhanced 32-Pin (5mm × 5mm) QFN Package
The LTC3839 is a 2-phase, single-output PolyPhase® synchronous step-down switching regulator controller that drives all N-channel power MOSFETs. The controlled on-time, valley current mode control architecture allows for fast transient response and constant frequency switching in steady-state operation, independent of VIN, VOUT and load current. Its load-release transient detection feature significantly reduces overshoot at low output voltages.
Differential output voltage sensing, along with a precision internal reference, offers an accurate ±0.67% output regulation, even if the remote output ground deviates from local ground by ±500mV.
The switching frequency can be programmed from 200kHz to 2MHz with an external resistor and can be synchronized to an external clock. Very low tON and tOFF times allow for near 0% and near 100% duty cycles, respectively. Voltage tracking soft start-up and multiple safety features are provided.
Applications
- Distributed Power Systems
- Point-of-Load Converters
- Computing Systems
- Data Communication Systems
Documentation
Data Sheet 1
User Guide 1
Application Note 1
Technical Articles 2
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 |
|---|---|---|---|
| LTC3839EUH#PBF | 32-Lead QFN (5mm x 5mm x 0.75mm w/ EP) | ||
| LTC3839EUH#TRPBF | 32-Lead QFN (5mm x 5mm x 0.75mm w/ EP) | ||
| LTC3839IUH#PBF | 32-Lead QFN (5mm x 5mm x 0.75mm w/ EP) | ||
| LTC3839IUH#TRPBF | 32-Lead QFN (5mm x 5mm x 0.75mm w/ EP) |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
Jan 20, 2022 - 21_0269 Addition of Alternate Assembly Site ASE Taiwan for Select LFCSP Products |
||
| LTC3839EUH#PBF | PRODUCTION | |
| LTC3839EUH#TRPBF | PRODUCTION | |
| LTC3839IUH#PBF | PRODUCTION | |
| LTC3839IUH#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 |
| Power System Management (PSM) & Sequencers 1 | ||
| LTC2974 | RECOMMENDED FOR NEW DESIGNS | 4-Channel PMBus Power System Manager Featuring Accurate Output Current Measurement |
| Protection Switches & Controllers 1 | ||
| LT4363 | RECOMMENDED FOR NEW DESIGNS | High Voltage Surge Stopper with Current Limit |
| Switching Regulators & Controllers 1 | ||
| LTC3880 | RECOMMENDED FOR NEW DESIGNS | Dual Output PolyPhase Step-Down DC/DC Controller with Digital Power System Management |
Tools & Simulations
LTspice 2
- LTC3839 Demo Circuit - Fast Transient Step-Down DC/DC Converter with Rsense Current Sensing (4.5-14V to 1.5V @ 40A)
- LTC3839 Demo Circuit - 2MHz, 2-Phase, Step-Down Converter with Rsense Current Sensing (4.5-14V to 3.3V @ 25A)
Models for the following parts are available in LTspice:
- LTC3839
LTpowerCAD 2
- LTC3839 Project - Fast, 2-Phase Single Output Step-Down Supply with Inductor DCR Current Sensing (4.5-14V to 1.5V & 40A)
- LTC3839 Project - Fast, 2-Phase Single Output Step-Down Supply (4.5-14V to 1.5V & 40A)
Design tools for the following parts are available in LTpowerCAD:
- LTC3839
- LTC3839DC1632ADEMOBOARDRSENSE
- LTC3839DC1632AMODIFIEDFORDCRSENSE
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.
LTpowerCAD® is a power supply design program which selects power stage components, provides detailed power efficiency, shows quick loop Bode plot stability and load transient analysis, and can export to LTspice for simulation.
Evaluation Kits
LTC3839EUH Demo Board | VIN = 4.5V to 14V, VOUT = 1.5V @ 40A