Linear Design Features: LTC3829 - Jian Li's Technical Journal
Summary
Technical article from LT Journal of Analog Innovation presenting Linear Technology LTC3829 feature-rich single-output 3-phase synchronous buck controller with on-chip drivers, remote output voltage sensing, inductor DCR temperature compensation, Stage Shedding mode, active voltage positioning (AVP), and nonlinear control for high efficiency and fast transient response. Suitable for input from 4.5V to 38V and output from 0.6V up to 5V. Provides high efficiency, high power density, and versatile
Page 1 Text Content
3-Phase Synchronous Step-Down DC/DC Controller with Stage Shedding, Active Voltage Positioning and Nonlinear Control for High Efficiency and Fast Transient Response Jian Li and Kerry Holliday
SE NS E1
SE NS E1
PL LI
SE NS E2
IL IM The LTC3829 is a feature-rich single-output 3-phase synchronous buck controller FR EQ
SE NS E2 OD
with on-chip drivers, remote output voltage sensing, inductor DCR temperature SE NS E3
RU compensation, Stage Shedding™ mode, active voltage positioning (AVP) and nonlinear IF AS
SE NS E3
control. It is suitable for input from 4.5V to 38V and output from 0.6V up to 5V. The LTC3829 provides high efficiency, high power density and versatile power solutions for computers, telecom systems, industrial equipment and DC power distribution systems. The LTC3829 is available in 38-pin 5mm × 7mm QFN and 38-pin FE packages.
10µF VIN
DIFFOUT 2.2Ω
16V 7V TO 14V
100k VIN
MODE GND RUN
INTVCC
PLLIN S1P S1N
47p F VOUT
RSENSE1 330µF
INTVCC 0.001Ω 2.5V
CLKOUT CLKOUT 6.3V
D1 CMDSH-3 Q3 Q4 SANYO
BOOST1
ISET TG1
TG1 VIN
VOSENSE DIFFN SW1
VOSENSE DIFFP 10µF Q1,Q5,Q9: RJK0305DPB
66.5Ω 16V Q3,Q4,Q7,Q8,Q11,Q12: RJK0330DPB
0Ω D2 CMDSH-3
AVP LTC3829
DIFFOUT DIFFOUT BOOST2 EXTVCC EXTVCC 0.1µF
PGOOD PGOOD TG2
SW2 VOSENSE
ITEMP ITEMP SW2
BG2 Q5
GND BG2 10Ω
D3 CMDSH-3 0.33µH VOUT
TK/SS BOOST3 330µF
RSENSE2 60A
CSS 0.001Ω 2.5V
0.1µF Q7 Q8 SANYO
TG3 X5R
×2 SW3 GND
VOSENSE
Figure 1. A 1.5V/60A, S2N
3-phase converter
featuring the LTC3829 S2P SW3
VOUT 100Ω RSENSE3 330µF
S1N BG3 0.001Ω 2.5V
Q11 Q12 SANYO
32 | October 2011 : LT Journal of Analog Innovation
Page Summary Contents For Linear Design Features: LTC3829 - Jian Li's Technical Journal
Manual Details
| Brand | Linear |
|---|---|
| Pages | 4 |
| File Size | 2.62 MB |
| Published | June 18, 2026 |
Enter the captcha to get the download link:
Frequently Asked Questions
What are the operational voltage ranges for the LTC3829?
It supports input voltages from 4.5V to 38V, and output voltages from 0.6V up to 5V.
How does the LTC3829 improve transient response during load steps?
The constant-frequency IFAST control loop actively monitors the output voltage and thresholds to prevent overshoot or undershoot during transients.
Can I sense inductor DCR for enhanced accuracy?
Yes, the controller supports accurate DCR sensing using selectable resistors (30mV, 50mV, or 75mV) or through an external amplifier.
What is the maximum achievable frequency and stage capability?
The constant-frequency peak current mode control architecture allows a phase-lockable frequency of up to 770kHz and supports up to 6-phase operation.