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Analog Devices Inc. LTC3829EUHF#TRPBF
- Part No.:
- LTC3829EUHF#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 38-WFQFN Exposed Pad
- Datasheet:
-
LTC3829EUHF#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 38QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,838
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Product details
Overview
LTC3829EUHF#TRPBF from Analog Devices is a 3-phase, single-output synchronous step-down DC/DC controller driving triple N-channel MOSFET stages with phase-lockable frequency up to 770kHz, 0.6V ±0.75% reference accuracy, and true remote sensing via integrated differential amplifier. It operates from 4.5V to 38V input and delivers 0.6V–3.3V output with DCR temperature compensation and programmable active voltage positioning - used in high-current telecom power distribution systems.
For engineers reviewing the LTC3829EUHF#TRPBF datasheet, LTC3829EUHF#TRPBF pinout, LTC3829EUHF#TRPBF application, or LTC3829EUHF#TRPBF equivalent, key selection criteria include phase-lockable 250–770kHz operation, 38-pin QFN (5mm × 7mm) package with exposed PGND/SGND pad, differential remote sense capability, and support for stage shedding or Burst Mode® at light load.
Technical Context
The LTC3829EUHF#TRPBF implements constant-frequency current-mode control across three interleaved phases, minimizing input capacitor ESR losses through 120° phase offset. Its architecture integrates a transconductance error amplifier, precision 0.6V reference with ±0.75% accuracy over –40°C to 125°C, and independent current-sense comparators per phase with programmable threshold via ILIM pin (GND/FLOAT/INTVCC).
It supports 6-phase expansion via CLKIN/CLKOUT synchronization, includes nonlinear fast-transient mode triggered by IFAST pin, and features active voltage positioning (AVP) with sink/source capability on AVP pin - all enabled within a single 38-pin QFN package rated for automotive AEC-Q100 compliance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 38V - supports wide-input industrial and telecom rails without external pre-regulation. |
| Output Voltage Range (with Diffamp) | 0.6V to 3.3V - enables precise low-voltage CPU/GPU core regulation with remote sensing. |
| Reference Accuracy | ±0.75% at 0.6V - ensures tight output regulation under line/load/temperature variation. |
| Switching Frequency Range | 250kHz to 770kHz - adjustable via FREQ pin current; phase-lockable for multi-controller synchronization. |
| Phase Configuration | 3-phase interleaved or expandable to 6-phase - reduces input/output ripple and thermal stress per phase. |
| Current Sensing | RSENSE or DCR with programmable temperature compensation - eliminates need for separate thermistors in DCR-based designs. |
| Light-Load Operation | PWM, Stage Shedding™, or Burst Mode® selectable via MODE pin - optimizes efficiency across 0.1A–50A load range. |
Pinout & Package
Package: 38-lead (5mm × 7mm) plastic QFN with exposed SGND/PGND pad (Pin 39), rated for –40°C to 125°C junction temperature and θJA = 34°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DIFFP (Pin 2) | Positive input of remote sensing differential amplifier | Must connect directly to remote load positive terminal - enables Kelvin sensing at point-of-load. |
| DIFFN (Pin 1) | Negative input of remote sensing differential amplifier | Connects to remote load ground - completes differential measurement path for accurate VOUT regulation. |
| TG1/TG2/TG3 (Pins 32/27/20) | Top gate driver outputs | Floating drivers with INTVCC-referenced swing - drive high-side N-MOSFET gates in buck topology. |
| BG1/BG2/BG3 (Pins 30/29/22) | Bottom gate driver outputs | Ground-referenced drivers - control low-side N-MOSFETs with 25ns rise/fall time and 1.1Ω RDS(ON) pull-down. |
| SENSE1+/SENSE1– … SENSE3+/SENSE3– (Pins 5/6, 7/8, 11/12) | Per-phase current sense comparator inputs | Supports RSENSE or DCR sensing networks - thresholds programmable via ILIM pin (25–82mV range). |
| VFB (Pin 13) | Error amplifier feedback input | Receives scaled output of DIFFOUT - compares against 0.6V internal reference to regulate VOUT. |
| ITH (Pin 14) | Error amplifier output / current threshold control | Directly sets peak inductor current per phase - voltage range 0.5V–1.6V defines current limit and loop gain. |
| CLKOUT (Pin 34) | Clock output for phase synchronization | 60° out-of-phase in 3-phase mode; 180° during stage shedding - enables deterministic multi-phase coordination. |
Key Features
| Feature | Design Value |
|---|---|
| True remote sensing differential amplifier | Gain = 0.997–1.003 V/V, 2.5mV offset, 100dB PSRR - maintains ±0.5% regulation accuracy despite PCB IR drop. |
| Programmable active voltage positioning (AVP) | Sink/source capability (250µA/2mA) with 180mV max drop - implements load-line regulation for CPU/GPU dynamic load tracking. |
| DCR temperature compensation | ITEMP pin accepts NTC thermistor near inductor - compensates copper resistance drift to maintain current-sense accuracy over temperature. |
| Triple N-channel MOSFET synchronous drive | TG/BG drivers with 2.6Ω/1.5Ω RDS(ON) pull-up/pull-down - supports high-efficiency, high-current (>50A) buck stages without external drivers. |
| Stage shedding and Burst Mode® | Selectable via MODE pin - sheds phases at light load to reduce switching losses while maintaining fast transient response. |
Applications
| Telecom Power Distribution | Notebook Core Voltage Regulation |
|---|---|
Use Scenario: High-density 48V-to-12V intermediate bus conversion feeding multiple POL modules in 5G base station RF cards. IC Role / Device Role / Timing Role: Primary 3-phase controller managing >40A output with interleaved switching to minimize input ripple and EMI. Use Value: 770kHz max frequency enables compact magnetics; phase shedding extends efficiency >90% down to 2A load. | Use Scenario: Dual-phase (using two LTC3829EUHF#TRPBF in parallel) generating 1.2V/50A for high-performance mobile CPU cores. IC Role / Device Role / Timing Role: Synchronous buck controller with differential remote sense correcting for VRM PCB trace resistance. Use Value: ±0.75% reference + AVP ensures <±15mV output deviation under 0–50A load steps; 125°C rating supports thin-profile thermal design. |
| Industrial DC Power Systems | Automotive ADAS Domain Controller Supply |
Use Scenario: 24V-to-3.3V conversion for FPGA and high-speed SerDes in factory automation PLC backplanes. IC Role / Device Role / Timing Role: Single-output 3-phase controller delivering stable low-noise 3.3V with true remote sensing at FPGA power pins. Use Value: Differential amplifier rejects common-mode noise; 38V max VIN accommodates 24V system transients per ISO 7637-2. | Use Scenario: AEC-Q100 qualified 12V-to-1.0V supply for vision processor SoC in autonomous driving domain controller. IC Role / Device Role / Timing Role: Automotive-grade 3-phase buck controller with DCR current sensing and temperature-compensated foldback protection. Use Value: Built-in UVLO (3.3V), PGOOD indicator, and 125°C operation meet ASIL-B functional safety requirements for power management. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 3-phase synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3877IUFD#TRPBF | 2-phase only; no integrated diffamp; requires external op-amp for remote sense; lower max fSW (600kHz) | Targeted at cost-sensitive dual-phase designs where remote sensing is optional or implemented externally | Choose when 2-phase operation suffices and board space allows discrete remote sense circuitry |
| MP2940AGQ-DC-LF-Z | 3-phase, 0.6V ref, but no DCR tempco; fixed 500kHz fSW; no AVP or stage shedding; QFN-32 package | Designed for server VRMs with simpler control and lower transient performance requirements | Choose for high-volume datacenter applications where Burst Mode and AVP are not required |
Compared with LTC3877IUFD#TRPBF and MP2940AGQ-DC-LF-Z, the LTC3829EUHF#TRPBF uniquely combines 3-phase interleaving, integrated differential remote sensing, programmable AVP, and DCR temperature compensation - making it optimal for high-accuracy, high-transient telecom and automotive applications requiring minimal external components.
Availability
LTC3829EUHF#TRPBF is available at Aetrix Electronics and suitable for telecom power distribution, notebook core voltage regulation, and industrial DC power systems requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant variants.
Supply support for LTC3829EUHF#TRPBF includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC3829EUHF#TRPBF belongs to the Power by Linear™ controller family, designed specifically for high-efficiency, high-current, multi-phase DC/DC conversion in space-constrained, thermally demanding environments.
FAQ
What is the maximum operating junction temperature for the LTC3829EUHF#TRPBF?
The LTC3829EUHF#TRPBF is specified for operation from –40°C to 125°C junction temperature. Its 38-pin QFN package has θJA = 34°C/W, and thermal design must ensure TJ ≤ 125°C under worst-case load and ambient conditions. Derating curves in the datasheet confirm full electrical performance across this range, including reference accuracy and current-sense threshold stability.
Does the LTC3829EUHF#TRPBF support both RSENSE and DCR current sensing?
Yes, the LTC3829EUHF#TRPBF supports both RSENSE and DCR current sensing per phase. SENSE+ and SENSE– pins accept either configuration. When using DCR, the ITEMP pin enables temperature compensation via an external NTC thermistor placed near the inductor, ensuring consistent current-limit accuracy across –40°C to 125°C.
How does the differential amplifier in the LTC3829EUHF#TRPBF improve regulation accuracy?
The differential amplifier in the LTC3829EUHF#TRPBF measures voltage directly at the load (via DIFFP/DIFFN), rejecting PCB trace IR drop and noise. With 0.997–1.003 V/V gain, 2.5mV offset, and 100dB PSRR, it delivers ±0.5% regulation accuracy at the point-of-load - critical for sub-1V CPU/GPU supplies where even 10mV error impacts performance.
Can the LTC3829EUHF#TRPBF be synchronized to an external clock source?
Yes, the LTC3829EUHF#TRPBF supports external synchronization via the PLLIN pin. An external clock applied to PLLIN locks the internal oscillator frequency and phase, enabling deterministic interleaving across multiple controllers. This is essential for EMI reduction and predictable current sharing in multi-rail systems using several LTC3829EUHF#TRPBF devices.
What are the key differences between Burst Mode® and Stage Shedding modes on the LTC3829EUHF#TRPBF?
In Burst Mode®, the LTC3829EUHF#TRPBF disables all three phases intermittently to minimize quiescent current, achieving >90% efficiency at ~0.1A. In Stage Shedding mode (MODE = INTVCC), it disables phases 2 and 3 while increasing gain on phase 1 - maintaining continuous conduction in the active phase for faster transient response and lower output ripple than Burst Mode® at medium loads (~1–10A).
LTC3829EUHF#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- PolyPhase®
- Package/Case:
- 38-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Type:
- Transistor Driver
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Number of Outputs:
- 3
- Output Phases:
- 3
- Voltage - Supply (Vcc/Vdd):
- 4.5V ~ 38V
- Frequency - Switching:
- 250kHz ~ 770kHz
- Duty Cycle (Max):
- 94%
- Synchronous Rectifier:
- Yes
- Clock Sync:
- No
- Serial Interfaces:
- -
- Control Features:
- Current Limit, Enable, Frequency Control, Power Good, Soft Start, Tracking
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 38-QFN (5x7)
LTC3829EUHF#TRPBF FAQ
1.How can I place an order for LTC3829EUHF#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3829EUHF#TRPBF on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LTC3829EUHF#TRPBF reliable?
The price and inventory of LTC3829EUHF#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3829EUHF#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3829EUHF#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3829EUHF#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3829EUHF#TRPBF?
LTC3829EUHF#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3829EUHF#TRPBF order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LTC3829EUHF#TRPBF?
For technical support, including LTC3829EUHF#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3829EUHF#TRPBF requirements.
6.How does Aetrix verify that LTC3829EUHF#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3829EUHF#TRPBF products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LTC3829EUHF#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3829EUHF#TRPBF?
All LTC3829EUHF#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3829EUHF#TRPBF, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LTC3829EUHF#TRPBF part is unused and in its original packaging.
Return procedure for LTC3829EUHF#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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