LTC3838-1
RECOMMENDED FOR NEW DESIGNSDual, Fast, Accurate Step-Down DC/DC Controller with Dual Differential Output Sensing
- Part Models
- 4
- 1ku List Price
- Starting From $4.82
Overview
- Wide VIN Range: 4.5V to 38V, VOUT: 0.6V to 5.5V
- Two Independent Channels: Dual/Single Output
- Output Voltage Regulation Accuracy: ±0.67% (VOUT1) and ±0.75% (VOUT2) Over Temperature
- Differential Remote Output Sensing: Up to ±500mV (VOUT1) and ±200mV (VOUT2) Ground Deviations
- Controlled On-Time, Valley Current Mode Control
- Fast Load Transient Response Without Clock Delay
- Detect Transient Release (DTR) Reduces VOUT Overshoot
- Frequency Programmable from 200kHz to 2MHz, Synchronizable to External Clock
- tON(MIN) = 30ns, tOFF(MIN) = 90ns
- 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 38-Pin (5mm × 7mm) QFN Package
The LTC3838-1 is a dual-channel, PolyPhase® synchronous step-down DC/DC switching regulator controller. Two independent channels drive all N-channel power MOSFETs. The controlled on-time, valley current mode control architecture allows for not only fast response to transients without clock delay, but also constant frequency switching at steady load condition. Its proprietary load-release transient detection feature (DTR) significantly reduces overshoot at low output voltages.
A precision internal reference enables accurate differential output regulation. The dual channels can either provide two independent output voltages, or be combined into multiphase single-output configuration.
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.
See below for a comparison of LTC3838, LTC3838-1 and LTC3838-2.
| Part Number | Description |
| LTC3838 | ±0.67% Differential Output Voltage Accuracy Over Temperature on Channel 1, ±1% Output Regulation on Channel 2, Separate Per Channel 30mV to 100mV Current Sense Range Controls |
| LTC3838-1 | ±0.67% Differential Output Voltage Accuracy Over Temperature on Both Channel 1 and Channel 2, Single Pin 30mV/60mV Current Sense Range Controls |
| LTC3838-2 | ±0.67% Differential Output Voltage Accuracy With Internal Reference on Channel 1, ±4mV Differential with External Reference Voltage on Channel 2, Fixed 30mV Current Sense Range |
Applications
- Distributed Power Systems; Power Supply for ASIC
- Computing, Data Storage, Communication Systems
- Low Voltage, High Current, and/or High Step-Down Ratio Converters That Demand Tight Load Transient Regulation
Documentation
Data Sheet 1
User Guide 1
Application Note 1
Technical Articles 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 |
|---|---|---|---|
| LTC3838EUHF-1#PBF | 38-Lead QFN (5mm x 7mm w/ EP) | ||
| LTC3838EUHF-1#TRPBF | 38-Lead QFN (5mm x 7mm w/ EP) | ||
| LTC3838IUHF-1#PBF | 38-Lead QFN (5mm x 7mm w/ EP) | ||
| LTC3838IUHF-1#TRPBF | 38-Lead QFN (5mm x 7mm w/ EP) |
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 |
|---|---|---|
| Hot Swap Controllers 1 | ||
| LT4363 | RECOMMENDED FOR NEW DESIGNS | High Voltage Surge Stopper with Current Limit |
| 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 3
- LTC3838-1 Demo Circuit - High Efficiency Step-Down DC/DC Converter with Rsense Current Sensing (3.3-14V to 1.2V & 0.9V @ 20A)
- LTC3838-1 - Step-Down (Buck) Regulators
- LTC3838-1 Demo Circuit - High Current, Dual Output Synchronous Buck Converter (4.5-14V to 1.5V & 1.2V @ 20A)
Models for the following parts are available in LTspice:
- LTC3838
- LTC3838-1
- LTC3838-2
LTpowerCAD
Design tools for the following parts are available in LTpowerCAD:
- LTC3838
- LTC3838DC1626A-ADCRSENSE
- LTC3838DC1626A-BRSENSE
- LTC3838DC1801A-BDEMOBOARDRSENSE
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
LTC3838EUHF-1 Demo Board | 4.5V ≤ VIN ≤ 14V; VOUT1 = 1.5V @ 20A, VOUT2 = 1.2V @ 20A
Resources
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