LINEAR dn434f Data Manual
Summary
The LTC3811 is a high-performance synchronous buck controller designed for demanding low voltage, high current DC/DC power applications. This guide details its dual output, 2-phase architecture, supporting loads up to 200A with adjustable voltage positioning and accurate load transient response. It is ideal for engineers developing robust supplies requiring ultra-low voltage (e.g., 1V), differential remote sensing, or high efficiency in complex power delivery systems.
Page 1 Text Content
Multiphase DC/DC Controller Pushes Accuracy and Bandwidth Limits Design Note 434 Tick Houk
Introduction In addition to high accuracy, the LTC3811’s low mini- Speed and accuracy don’t always go hand-in-hand mum on-time (typically 65ns) allows users to convert a in DC/DC converter systems—that is, until now. The 12V input to a 1V output at switching frequencies up to LTC3811 is a dual output, fi xed frequency current mode 750k Hz, optimizing load transient response and reducing DC/DC switching regulator controller designed for one of the solution size.
today’s most demanding power supply applications: high
A Dual Output, 2-Phase Supply with Differential
current, low voltage processor core supplies.
Remote Sensing and Inductor DCR Sensing
With supply current requirements in excess of 100A Figure 1 illustrates a dual output supply using the LTC3811. and supply voltages as low as 1V, every milliohm of The 1.5V, 15A output is regulated using the integrated PCB resistance and every millivolt of IR drop count. The differential remote sense amplifi er and tracks the output of LTC3811 has an output voltage tolerance of ±0.5% over channel 1 during start-up. Both outputs use DCR sensing temperature, giving power supply designers unprec- in order to maximize effi ciency and operate 180° out of edented fl exibility when making component value and
, LT, LTC, LTM and Poly Phase are registered trademarks of Linear Technology board layout choices. Corporation. All other trademarks are the property of their respective owners.
VIN 4.5V TO 14.5V
BAT54 VINEXTVCC DRVCCINTVCC BAT54
RJK0305DPB TG1 TG2 RJK0305DPB
BOOST1 BOOST2 SW1 SW2
RJK0301DPB BG1 BG2 RJK0301DPB
CLKOUT PGND
PLL/LPF PGOOD1 INTVCC
MODE/SYNC PGOOD2
PHASMODE CS/OUT
680n F LTC3811 680n F0.4μH 0.4μH
0.5mΩ SENSE1+ SENSE2+ 0.5mΩ
SENSE1– SENSE2–
RNG2 DIFF/IN+
RNG1 DIFF/IN–
11.8k RUN1 1% VOUT1 1% DIFF/OUT
2V FB1 FB2 VOUT2
COMP1 COMP2
4.99k 56k SS/TRACK1 SS/TRACK2SGND 56k 4.99k X5R ×2
DN434 F01
Figure 1. Dual Output, 2-Phase Supply with Differential Remote Sensing and Inductor DCR Sensing
Page Summary Contents For LINEAR dn434f Data Manual
Manual Details
| Brand | Linear |
|---|---|
| Pages | 2 |
| File Size | 109.50 KB |
| Published | July 16, 2026 |
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Frequently Asked Questions
How can I scale the device for extremely high current requirements?
It utilizes its proprietary PolyPhase architecture to support 2-, 3-, 4-, 6-, or 12-phase operation, extending output current capacity beyond 200A.
What methods are available for sensing the inductor current?
Current can be sensed using either an external sense resistor placed in series or by sensing the DCR of the inductor core itself.
How does the controller maintain stability during sudden load changes?
It incorporates Load Step Improvement and a remote sensing differential amplifier, which significantly improves transient response and output accuracy.