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Analog Devices Inc. LTC3829IUHF#TRPBF
- Part No.:
- LTC3829IUHF#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 38-WFQFN Exposed Pad
- Datasheet:
-
LTC3829IUHF#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 38QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,897
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Product details
Overview
LTC3829IUHF#TRPBF from Analog Devices is a high-performance 3-phase, single-output synchronous step-down DC/DC controller driving triple N-channel MOSFET stages. It features a phase-lockable 250–770 kHz current-mode architecture, true remote sensing via integrated differential amplifier, 0.6 V ±0.75% reference accuracy, and programmable DCR temperature compensation - optimized for high-current telecom power distribution systems delivering up to 50 A at 1.2 V.
For engineers reviewing the LTC3829IUHF#TRPBF datasheet, LTC3829IUHF#TRPBF pinout, LTC3829IUHF#TRPBF application, or LTC3829IUHF#TRPBF equivalent, key selection criteria include phase-shedding capability for light-load efficiency, AVP support for active voltage positioning, input voltage range (4.5 V to 38 V), output voltage range (0.6 V to 3.3 V with diffamp), and QFN-38 (5 mm × 7 mm) thermal performance (θJA = 34°C/W).
Technical Context
The LTC3829IUHF#TRPBF implements a constant-frequency current-mode control loop with three independent channel current comparators referenced to the ITH pin voltage. Each phase operates 120° out of phase to reduce input capacitor RMS current and EMI, and supports 6-phase expansion via CLKIN/CLKOUT synchronization.
Its differential amplifier (DIFFP/DIFFN → DIFFOUT) enables true point-of-load sensing with 0.997–1.003 V/V gain and 2.5 mV offset, while programmable AVP (via resistor to DIFFP) allows load-line slope adjustment for CPU VRM compliance. The device integrates nonlinear fast-transient response (IFAST pin), adjustable soft-start (TK/SS), and three-stage shedding logic triggered below 0.5 V on ITH.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 38 V - supports wide-input industrial and telecom rails without external pre-regulation. |
| Output Voltage Range | 0.6 V to 3.3 V with diffamp - enables precise low-voltage regulation at point-of-load for CPUs/FPGAs. |
| Reference Accuracy | ±0.75% at 0.6 V over –40°C to 125°C - ensures tight output tolerance under thermal stress. |
| Switching Frequency | 250 kHz to 770 kHz, phase-lockable - allows EMI shaping and multi-phase synchronization. |
| Phase Configuration | 3-phase standard; expandable to 6-phase - reduces per-phase current stress and improves transient response. |
| Current Sensing | RSENSE or DCR with programmable temperature compensation - eliminates external thermistors for accurate current limiting across temperature. |
| Efficiency | Up to 95% - achieved via low RDS(ON) gate drivers (TG: 2.6 Ω up / 1.5 Ω down; BG: 4 Ω up / 1.1 Ω down) and phase shedding. |
Pinout & Package
The LTC3829IUHF#TRPBF is housed in a 38-pin, 5 mm × 7 mm QFN package with exposed thermal pad (Pin 39 = SGND/PGND), rated for –40°C to 125°C operation and θJA = 34°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DIFFP (Pin 2) | Differential amplifier positive input | Must connect directly to remote load VOUT+ for true Kelvin sensing - not optional even when diffamp is unused. |
| DIFFN (Pin 1) | Differential amplifier negative input | Connects to remote load ground; forms precision feedback path independent of PCB IR drop. |
| TG1/TG2/TG3 (Pins 32/27/20) | Top gate drivers | Floating outputs driving high-side N-MOSFET gates; require bootstrap capacitors tied to BOOSTn pins. |
| BG1/BG2/BG3 (Pins 30/29/22) | Bottom gate drivers | Ground-referenced drivers for low-side N-MOSFETs; sink/source 25 ns transition times into 3300 pF. |
| SENSE1+/SENSE1– … SENSE3+/SENSE3– (Pins 5/6, 7/8, 11/12) | Per-phase current sense inputs | Support DCR or RSENSE sensing; each pair referenced to local SWx node for accurate peak-current detection. |
| CLKOUT (Pin 34) | Synchronization output | 60° out-of-phase in 3-phase mode; 180° during stage shedding - enables deterministic multi-controller timing alignment. |
| ILIM (Pin 16) | Current limit threshold select | SGND/FLOAT/INTVCC selection sets max sense threshold to 23/43/66 mV (I-grade) - configures foldback protection level. |
Key Features
| Feature | Design Value |
|---|---|
| Triple N-channel MOSFET drive | Integrated 5 V gate drivers with <2.6 Ω pull-up and <1.5 Ω pull-down - enables efficient switching of low-RDS(ON) discrete FETs. |
| True remote sensing differential amplifier | 0.997–1.003 V/V gain, 2.5 mV offset, 100 dB PSRR - rejects board-level noise and delivers sub-1% load regulation at point-of-load. |
| Programmable active voltage positioning (AVP) | Resistor-programmed load-line slope between DIFFP and AVP (Pin 4) - meets Intel VRM specifications for CPU dynamic load line compliance. |
| Stage shedding & Burst Mode operation | Selectable via MODE pin; shedding reduces phase count at light load while maintaining continuous conduction in active phases - improves light-load efficiency without ripple penalty. |
| DCR temperature compensation | ITEMP (Pin 37) accepts NTC thermistor near inductor; ITEMP current (9–11 µA) scales DCR gain to match copper tempco - maintains current-sense accuracy across –40°C to 125°C. |
Applications
| Telecom Power Distribution | High-Performance Computing VRMs |
|---|---|
Use Scenario: 48 V intermediate bus conversion to 1.2 V/50 A for ASIC/FPGA power domains in 5G baseband units. IC Role / Device Role / Timing Role: Primary 3-phase synchronous buck controller managing phase interleaving, current balancing, and remote voltage regulation. Use Value: 95% peak efficiency and 75 A/µs load-step response (nonlinear mode) maintain stable rail under burst traffic loads. | Use Scenario: Multi-phase CPU core voltage regulation in enterprise servers with dynamic AVP requirements. IC Role / Device Role / Timing Role: AVP-enabled controller implementing load-line droop via DIFFP–AVP resistor network and real-time current sensing. Use Value: ±0.75% reference accuracy and programmable DCR compensation ensure <±1% output deviation across full thermal and load range. |
| Industrial PLC Power Supplies | Automotive ADAS Domain Controllers |
Use Scenario: 24 V input to 3.3 V/20 A system rail in ruggedized programmable logic controllers with extended temperature operation. IC Role / Device Role / Timing Role: High-reliability 3-phase controller with AEC-Q100 qualified variants, undervoltage lockout (3.3 V), and thermal shutdown. Use Value: –40°C to 125°C guaranteed operation and 34°C/W thermal resistance enable convection-cooled designs in sealed enclosures. | Use Scenario: 12 V battery input to 1.0 V/30 A core supply for radar SoCs in automotive domain controllers. IC Role / Device Role / Timing Role: Automotive-grade synchronous controller supporting phase shedding, clock synchronization, and robust ESD protection. Use Value: Built-in 60° phase shift and CLKOUT synchronization allow seamless integration with companion controllers for >6-phase scaling. |
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 |
|---|---|---|---|
| ISL95812IRZ-T | 4-phase, integrated MOSFETs; no diffamp; fixed 0.6 V ref; lower max fSW (1 MHz vs 770 kHz) | Targeted at notebook CPU VRMs; lacks remote sensing and AVP - unsuitable for precision point-of-load regulation. | Select LTC3829IUHF#TRPBF when true remote sensing, AVP, or DCR tempco are required; ISL95812IRZ-T only where integrated FETs and higher phase count outweigh sensing fidelity. |
| MP8765GL-Z | 3-phase, no diffamp; no AVP; 0.6 V ±1% ref; supports only RSENSE; no phase shedding | Cost-optimized telecom/datacom PSU; limited to local feedback and fixed load line - cannot meet strict VRM droop specs. | Choose LTC3829IUHF#TRPBF for applications demanding sub-1% load regulation, programmable droop, or thermal-compensated current sensing; MP8765GL-Z fits simpler, lower-cost 3-phase systems without those features. |
Compared with ISL95812IRZ-T and MP8765GL-Z, the LTC3829IUHF#TRPBF uniquely combines true remote sensing, AVP programmability, and DCR temperature compensation - making it the only option among the three capable of meeting stringent CPU VRM and high-accuracy point-of-load requirements across –40°C to 125°C.
Availability
LTC3829IUHF#TRPBF is available at Aetrix Electronics and suitable for telecom power distribution systems, high-performance computing VRMs, and industrial PLC power supplies requiring stable component supply, long-term lifecycle support, and guaranteed –40°C to 125°C operation.
Supply support for LTC3829IUHF#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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC3829IUHF#TRPBF belongs to Analog Devices' Power by Linear™ multiphase controller family, engineered for high-current, high-efficiency DC/DC conversion in space-constrained, thermally demanding applications such as 5G infrastructure and AI accelerators.
FAQ
What is the operating temperature range for the LTC3829IUHF#TRPBF?
The LTC3829IUHF#TRPBF is specified for –40°C to 125°C junction temperature operation and is qualified for industrial and automotive applications. Its QFN-38 package has θJA = 34°C/W, enabling reliable thermal performance in convection-cooled environments. The "I" grade guarantees full electrical specifications across this entire range, unlike the "E" grade which is only guaranteed from 0°C to 85°C.
Does the LTC3829IUHF#TRPBF support true remote voltage sensing?
Yes, the LTC3829IUHF#TRPBF integrates a dedicated differential amplifier (DIFFP/DIFFN → DIFFOUT) with 0.997–1.003 V/V gain, 2.5 mV offset, and 100 dB PSRR. This circuit enables true Kelvin sensing at the point-of-load, eliminating PCB trace IR drop errors. DIFFP must be connected directly to the remote VOUT+ terminal - even if the diffamp is not actively used in the design.
How does the LTC3829IUHF#TRPBF implement phase shedding?
The LTC3829IUHF#TRPBF enters 1-phase operation when the ITH voltage drops below 0.5 V (programmable via ISET pin). In Stage Shedding mode (MODE = INTVCC), it disables channels 2 and 3 while increasing the current gain of channel 1 to maintain regulation. CLKOUT shifts to 180° out-of-phase during shedding to preserve timing integrity, and the differential amplifier remains fully functional for remote sensing.
What are the absolute maximum ratings for the BOOST pins on the LTC3829IUHF#TRPBF?
The BOOST1/BOOST2/BOOST3 pins on the LTC3829IUHF#TRPBF have an absolute maximum rating of 46 V to –0.3 V. These pins supply the floating gate drivers and swing from ~0.7 V below INTVCC to VIN + INTVCC. Exceeding 46 V risks permanent damage; proper bootstrap capacitor selection (e.g., 0.1 µF ceramic) and Schottky diode placement are critical to maintain safe voltage margins during startup and dropout conditions.
Can the LTC3829IUHF#TRPBF be synchronized to an external clock source?
Yes, the LTC3829IUHF#TRPBF supports external synchronization via the PLLIN pin (Pin 18). Applying a clean CMOS/TTL clock signal to PLLIN locks the internal oscillator frequency and phase. The device also provides a CLKOUT signal (Pin 34) for daisy-chaining multiple controllers - 60° out-of-phase in 3-phase mode and 180° during shedding - enabling deterministic multi-phase timing alignment without jitter accumulation.
LTC3829IUHF#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)
LTC3829IUHF#TRPBF FAQ
1.How can I place an order for LTC3829IUHF#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3829IUHF#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 LTC3829IUHF#TRPBF reliable?
The price and inventory of LTC3829IUHF#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3829IUHF#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3829IUHF#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3829IUHF#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3829IUHF#TRPBF?
LTC3829IUHF#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3829IUHF#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 LTC3829IUHF#TRPBF?
For technical support, including LTC3829IUHF#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3829IUHF#TRPBF requirements.
6.How does Aetrix verify that LTC3829IUHF#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3829IUHF#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 LTC3829IUHF#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3829IUHF#TRPBF?
All LTC3829IUHF#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3829IUHF#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 LTC3829IUHF#TRPBF part is unused and in its original packaging.
Return procedure for LTC3829IUHF#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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