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Analog Devices Inc. LTC3829EUHF#PBF
- Part No.:
- LTC3829EUHF#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 38-WFQFN Exposed Pad
- Datasheet:
-
LTC3829EUHF#PBF.pdf
- Description:
- IC REG CTRLR BUCK 38QFN
- Quantity:
- Payment:
- Shipping:
Inventory:212
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Product details
Overview
LTC3829EUHF#PBF from Analog Devices is a high-performance 3-phase, single-output synchronous step-down DC/DC controller driving all-N-channel MOSFET stages. It delivers up to 770kHz phase-lockable switching frequency, ±0.75% 0.6V reference accuracy, and true remote sensing via integrated differential amplifier. Designed for high-current CPU/GPU core supplies in telecom and computing systems, it supports DCR temperature compensation and programmable active voltage positioning (AVP).
For engineers reviewing the LTC3829EUHF#PBF datasheet, LTC3829EUHF#PBF pinout, LTC3829EUHF#PBF application, or LTC3829EUHF#PBF equivalent, key selection criteria include its 38-pin 5mm × 7mm QFN package with exposed PGND/SGND pad, triple-phase interleaved operation enabling low input/output ripple, and support for stage shedding, Burst Mode®, or forced continuous conduction across 4.5V–38V input and 0.6V–3.3V output (with diffamp) ranges.
Technical Context
The LTC3829EUHF#PBF implements a constant-frequency current-mode control architecture with three independent PWM channels synchronized in 120° phase offset. Each channel features dedicated SENSE+/- inputs, dual gate drivers (TG/BG), and bootstrap supply pins (BOOSTn), enabling precise per-phase current regulation and minimized input capacitor ESR losses.
Its differential amplifier (DIFFP/DIFFN/DIFFOUT) provides true point-of-load sensing with 0.997–1.003 V/V gain and 2.5mV input offset, while the ITH pin serves as both error amplifier output and current threshold control node. Phase-locking is achieved via PLLIN/CLKOUT pins, and 6-phase expansion is supported by clock chaining without external logic.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 38V - supports wide-range industrial and telecom power rails without pre-regulation |
| Output Voltage Range | 0.6V to 3.3V with diffamp - enables precise core voltage regulation at point-of-load |
| Reference Accuracy | ±0.75% at 0.6V - ensures tight output regulation under load/line/temp variations |
| Switching Frequency | 250kHz to 770kHz, phase-lockable - allows EMI shaping and multi-phase synchronization |
| Phase Configuration | 3-phase interleaved or expandable to 6-phase - reduces input/output ripple by √3× vs single-phase |
| Current Sensing | RSENSE or DCR with programmable temperature compensation - enables accurate lossless sensing across temp |
| Efficiency | Up to 95% - achieved via low-RDS(ON) gate drivers (TG RDOWN = 1.5Ω, BG RDOWN = 1.1Ω) |
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 (θJA = 34°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW1/SW2/SW3 | Switch node connections | Direct connection to inductor high-side terminals; voltage swing from ~–0.3V to VIN |
| TG1/TG2/TG3 | Top gate driver outputs | Floating drivers with INTVCC-referenced swing; require external bootstrap capacitors |
| BG1/BG2/BG3 | Bottom gate driver outputs | Ground-referenced drivers controlling synchronous rectifiers; fast 25ns rise/fall times |
| SENSE1+/SENSE1– etc. | Per-phase current sense inputs | Differential inputs supporting RSENSE or DCR networks; ±1µA bias current |
| DIFFP/DIFFN/DIFFOUT | Remote sense differential amplifier | True Kelvin sensing path: DIFFP→load+, DIFFN→load–, DIFFOUT→VFB divider |
| VIN / INTVCC / EXTVCC | Main input / internal 5V LDO / external bias | EXTVCC ≥4.7V bypasses INTVCC LDO for higher efficiency; INTVCC powers all logic/drivers |
| PGOOD / RUN / MODE | Power status / enable / operating mode | Open-drain PGOOD asserts after 100µs mask timer; MODE selects Burst/Stage Shedding/Continuous |
Key Features
| Feature | Design Value |
|---|---|
| Triple N-channel MOSFET synchronous drive | Enables high-efficiency, high-current buck conversion without external Schottky diodes |
| Programmable DCR temperature compensation | Compensates copper inductor resistance drift using ITEMP-connected NTC network |
| Active Voltage Positioning (AVP) | Adjusts output voltage downward under load via AVP–DIFFP resistor to reduce IR drop margin |
| True remote sense differential amplifier | 0.997–1.003 gain and 100dB PSRR eliminate PCB trace resistance errors at point-of-load |
| Phase-lockable fixed-frequency oscillator | 250–770kHz range with PLLIN/CLKOUT enables deterministic multi-controller synchronization |
| Output foldback current limiting | Three ILIM-selectable thresholds (25/45/68mV) provide scalable short-circuit protection |
Applications
| Telecom Core Supply | Server CPU VRM |
|---|---|
|
Use Scenario: High-current 1.2V/50A core rail for 5G baseband processors requiring tight transient response and low noise. IC Role / Device Role / Timing Role: Primary 3-phase synchronous buck controller managing interleaved switching, current balancing, and AVP-based droop. Use Value: 120° phase offset cuts input ripple by >85%, reducing bulk capacitance; differential sensing maintains ±1% regulation at socket. |
Use Scenario: Multi-phase VRM for x86 server CPUs where dynamic load steps exceed 75A/µs during instruction bursts. IC Role / Device Role / Timing Role: Master controller in staged configuration, coordinating phase shedding and nonlinear fast-transient (IFAST) response. Use Value: Nonlinear control reduces VOUT undershoot to 75mV during 0→75A step; stage shedding extends light-load efficiency to >90%. |
| Industrial DC Distribution | Networking Switch ASIC Supply |
|
Use Scenario: 3.3V/40A intermediate bus converter in ruggedized industrial PLCs with wide input (12–36V) and thermal cycling. IC Role / Device Role / Timing Role: Interleaved buck controller with DCR sensing and temperature-compensated current limit for reliability over –40°C to 125°C. Use Value: ITEMP-based DCR compensation maintains ±3% current limit accuracy across full temp range; AEC-Q100 qualified variant available. |
Use Scenario: Low-noise 0.85V/30A supply for high-speed Ethernet switch ASICs sensitive to switching noise coupling. IC Role / Device Role / Timing Role: 3-phase controller operating in Burst Mode® below 10% load to minimize standby power and conducted EMI. Use Value: Burst Mode reduces quiescent current to <40µA at shutdown; 770kHz max frequency enables small magnetics without compromising transient response. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multiphase synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2940AGQ-DC | 4-phase, integrated MOSFETs (no external FETs); lower max VIN (24V); no differential remote sense | Better for space-constrained designs needing integrated power stage; unsuitable for >24V input or precision remote sensing | Select MP2940AGQ-DC only when board area is critical and input ≤24V; LTC3829EUHF#PBF retains flexibility for high-VIN, high-current discrete FET designs. |
| ISL91302BIRZ-T | 2-phase + 1-phase configurable; integrated drivers but no DCR tempco; 0.5V ref (vs 0.6V); no CLKOUT/PLLIN | Targeted at mobile SoC supplies with strict size/power limits; lacks telecom/server-grade features like AVP or phase-locking | Choose ISL91302BIRZ-T for portable applications requiring ultra-low IQ; LTC3829EUHF#PBF is preferred for infrastructure-grade stability, scalability, and sensing fidelity. |
Compared with MP2940AGQ-DC and ISL91302BIRZ-T, the LTC3829EUHF#PBF uniquely combines 3-phase interleaving, true differential remote sensing, programmable AVP, and full DCR temperature compensation - making it the only option among the three qualified for AEC-Q100 automotive core supplies and high-precision telecom VRMs.
Availability
LTC3829EUHF#PBF is available at Aetrix Electronics and suitable for telecom systems, server CPU VRMs, and industrial DC distribution requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant variants.
Supply support for LTC3829EUHF#PBF 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 precision instrumentation, communications, and power management markets.
The LTC3829EUHF#PBF belongs to Analog Devices' Power by Linear™ multiphase controller family, engineered for high-efficiency, high-current DC/DC conversion in computing, networking, and industrial infrastructure where thermal performance, transient response, and sensing accuracy are critical.
FAQ
What is the maximum input voltage rating for the LTC3829EUHF#PBF?
The LTC3829EUHF#PBF has an absolute maximum input supply voltage (VIN) of 40V, with recommended operating range from 4.5V to 38V. Exceeding 40V risks permanent damage per Absolute Maximum Ratings. The device's robust 38V operational ceiling supports 24V and 36V industrial and telecom rails without derating.
Does the LTC3829EUHF#PBF support remote voltage sensing, and how is it implemented?
Yes, the LTC3829EUHF#PBF implements true remote sensing via an integrated differential amplifier with dedicated DIFFP, DIFFN, and DIFFOUT pins. DIFFP connects directly to the load's positive terminal and DIFFN to the load's ground reference, enabling Kelvin sensing that rejects PCB trace IR drops. The DIFFOUT signal feeds into the VFB loop to maintain regulation at the point-of-load.
How does the LTC3829EUHF#PBF handle light-load efficiency optimization?
The LTC3829EUHF#PBF offers three selectable light-load modes via the MODE pin: Burst Mode® (pin floating), Stage Shedding™ (pin tied to INTVCC), or forced continuous conduction (pin grounded). Burst Mode reduces quiescent current to <40µA; Stage Shedding disables phases 2 and 3 while boosting phase 1 gain for smooth transitions; both improve efficiency below 20% load without sacrificing regulation.
What package type and thermal characteristics apply to the LTC3829EUHF#PBF?
The LTC3829EUHF#PBF uses a 38-lead 5mm × 7mm plastic QFN with exposed SGND/PGND pad (Pin 39), rated for –40°C to 125°C junction temperature. Its thermal resistance is θJA = 34°C/W when mounted on a 4-layer PCB with 2-in² 2-oz copper pour under the exposed pad, enabling reliable operation at full load in compact enclosures.
Can the LTC3829EUHF#PBF be configured for 6-phase operation, and what is required?
Yes, the LTC3829EUHF#PBF supports 6-phase operation via clock chaining: its CLKOUT pin outputs a 60°-phase-shifted signal (non-shedding mode) that can synchronize a second LTC3829EUHF#PBF's PLLIN pin. No external logic is needed - only matching FREQ resistor values and proper clock routing ensure deterministic interleaving across all six phases.
LTC3829EUHF#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- PolyPhase®
- Package/Case:
- 38-WFQFN Exposed Pad
- Packaging:
- Tube
- 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#PBF FAQ
1.How can I place an order for LTC3829EUHF#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3829EUHF#PBF 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#PBF reliable?
The price and inventory of LTC3829EUHF#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3829EUHF#PBF is usually 5 days.
3.What payment methods are accepted for LTC3829EUHF#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3829EUHF#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3829EUHF#PBF?
LTC3829EUHF#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3829EUHF#PBF 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#PBF?
For technical support, including LTC3829EUHF#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3829EUHF#PBF requirements.
6.How does Aetrix verify that LTC3829EUHF#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3829EUHF#PBF 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#PBF meets industry standards.
7.What is the process for return or replacement of LTC3829EUHF#PBF?
All LTC3829EUHF#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3829EUHF#PBF, 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#PBF part is unused and in its original packaging.
Return procedure for LTC3829EUHF#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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