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Analog Devices Inc. LTC3729LEUH-6#TRPBF
- Part No.:
- LTC3729LEUH-6#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 32-WFQFN Exposed Pad
- Datasheet:
-
LTC3729LEUH-6#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 32QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,077
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Product details
Overview
LTC3729LEUH-6#TRPBF from Analog Devices (formerly Linear Technology) is a dual-phase, polyphase synchronous step-down controller IC for high-current DC/DC regulation. It features 0.6V ±1% reference voltage, phase-lockable 250kHz–550kHz fixed-frequency operation, true remote differential sensing, and integrated power-good monitoring. It drives external N-channel MOSFETs in desktop computers, internet servers, and large memory arrays requiring up to 200A output via multi-phase expansion.
For engineers reviewing the LTC3729LEUH-6#TRPBF datasheet, LTC3729LEUH-6#TRPBF pinout, LTC3729LEUH-6#TRPBF application, or LTC3729LEUH-6#TRPBF equivalent, key selection considerations include its dual-phase current-mode control architecture, 32-pin 5mm × 5mm QFN package with exposed ground pad, OPTI-LOOP® compensation for wide ESR/capacitance tolerance, and CLKOUT-driven scalability to 12-phase systems.
Technical Context
The LTC3729LEUH-6#TRPBF implements constant-frequency current-mode control with two independent PWM channels operating 180° out of phase. Its internal 0.6V reference feeds an error amplifier comparing remote-sensed output voltage via EAIN, while ITH sets peak inductor current per channel. The phase-locked loop accepts external synchronization on PLLIN and supports frequency tuning via PLLFLTR (260kHz–550kHz).
It integrates a differential amplifier (VDIFFOUT, VOS±) for true remote sensing across high-current PCB traces, a micropower shutdown mode (<40µA), and dual gate drivers (TG1/TG2, BG1/BG2) supporting 99% duty cycle in dropout. The RUN/SS pin combines soft-start ramping, short-circuit timeout, and latchoff arming at 4.75V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Topology | Dual-phase synchronous buck controller - enables interleaved operation to halve input/output RMS ripple and scale current beyond 40A per stage. |
| Reference Voltage | 0.600V ±1% - ensures tight output regulation accuracy across temperature and load for 0.7V–5V outputs. |
| Switching Frequency Range | 250kHz to 550kHz - adjustable via PLLFLTR voltage; higher frequencies reduce passive size but increase switching losses. |
| Input Voltage Range | 4V to 30V - supports wide-range industrial and server rail inputs including 5V, 12V, and 24V distribution buses. |
| Output Current Capability | Up to 200A with 12-phase expansion - achieved via CLKOUT daisy-chaining; dual-phase base supports ≥40A with proper MOSFET selection. |
| Remote Sensing | Differential amplifier with 0.995–1.005 gain and 46–55dB CMRR - rejects trace IR drop and noise for stable regulation in high-current, long-trace applications. |
| Power-Good Threshold | ±10% output window with 100µs fault masking - provides reliable system enable signaling without nuisance trips during transients. |
Pinout & Package
Package: 32-lead 5mm × 5mm plastic QFN with exposed signal ground pad (must be soldered to PCB). Thermal resistance θJA = 34°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EAIN (1) | Error amplifier input | Receives feedback voltage from VDIFFOUT divider; compared to 0.6V reference to regulate output. |
| PLLFLTR (2) | PLL low-pass filter node | DC voltage input (0–2.4V) sets oscillator frequency; also serves as phase detector output. |
| PLLIN (3) | External sync input | 50kΩ internally pulled to SGND; locks rising edge of TG1 to external clock's rising edge. |
| PHASMD (4) | Phase mode select | Configures relative phase between controllers and CLKOUT (0°/180°/240° options). |
| ITH (5) | Error amp output / compensation node | Controls peak current per phase; voltage range 0–2.4V directly scales current sense threshold. |
| SGND (6) | Signal ground reference | Common return for all analog circuitry; must be routed separately from PGND to avoid noise coupling. |
| VDIFFOUT (7) | Differential amplifier output | Drives external resistor divider to set regulated output voltage; referenced to SGND. |
| VOS– / VOS+ (8,9) | Differential amplifier inputs | Accept remote sense points at output capacitor terminals; enable true Kelvin sensing. |
| TG1 / TG2 (14,26) | Top gate drivers | Floating N-channel drivers with INTVCC-referenced swing; support bootstrap operation up to 99% duty cycle. |
| BG1 / BG2 (18,22) | Bottom gate drivers | GND-referenced N-channel drivers; complement TGx for synchronous rectification. |
| CLKOUT (27) | Phase-locked clock output | Provides timing signal to synchronize up to 12 controllers; enables scalable high-current PolyPhase designs. |
| RUN/SS (28) | Soft-start / run control / fault timer | Capacitor sets ramp time; <0.8V disables all functions; >4.75V arms short-circuit latchoff. |
| PGOOD (13) | Open-drain status output | Asserts low when EAIN deviates >±10% from 0.6V; includes 100µs blanking for OV/UV immunity. |
Key Features
| Feature | Design Value |
|---|---|
| PolyPhase™ interleaving | Reduces input/output RMS ripple by √N (N = phases); enables 75% lower input capacitor RMS current in dual-phase vs single-phase. |
| OPTI-LOOP® compensation | Allows stable loop response across wide range of output capacitance (10µF–10,000µF) and ESR (0.5mΩ–100mΩ) without redesign. |
| True remote differential sensing | Rejects up to 5V common-mode offset with 46–55dB CMRR; maintains regulation accuracy despite PCB trace resistance. |
| Current foldback + timed shutdown | Automatically reduces peak current during overloads and latches off after programmable RUN/SS timeout-prevents thermal runaway. |
| Wide VIN and ultra-low dropout | Operates from 4V–30V input; sustains regulation at 99% duty cycle-critical for high-VIN-to-low-VOUT conversion (e.g., 12V→0.7V). |
| Integrated 5V LDO + EXTVCC switchover | Internal regulator powers logic/drivers; switches to external EXTVCC (>4.7V) for higher efficiency and gate drive headroom. |
Applications
| Desktop Computer VRM | Internet Server Power Supply |
|---|---|
Use Scenario: Regulating CPU core voltage (e.g., 0.7V/40A) from 12V intermediate bus with tight transient response and minimal output ripple. IC Role / Device Role / Timing Role: Dual-phase synchronous buck controller managing two parallel power stages with 180° interleaving and remote Kelvin sensing at CPU socket. Use Value: Reduces output capacitor count by 50% and improves load-step recovery time by 2× versus single-phase due to doubled effective switching frequency. |
Use Scenario: Providing stable 1.8V/60A supply to memory modules in rack-mounted servers with distributed PCB layout and long interconnects. IC Role / Device Role / Timing Role: Dual-phase controller with differential amplifier (VOS±) compensating for 50mΩ trace resistance between VRM and DIMM slots. Use Value: Maintains ±0.5% output regulation under full load despite 150mV IR drop-eliminates need for point-of-load regulators. |
| Large Memory Array Regulator | DC Power Distribution System |
Use Scenario: Delivering 1.2V/80A to GPU memory subsystem with strict EMI limits and thermal constraints in compact form factor. IC Role / Device Role / Timing Role: Base controller in 4-phase stack (using CLKOUT daisy-chain) driving Si7840DP/Si7440DP MOSFETs with 550kHz per-phase switching. Use Value: Achieves >92% peak efficiency at 60A while limiting input capacitor temperature rise to <10°C above ambient. |
Use Scenario: Centralized 3.3V/100A power rail for industrial backplane with redundancy and health monitoring requirements. IC Role / Device Role / Timing Role: Dual-phase controller with PGOOD output feeding system supervisor IC; RUN/SS used for coordinated startup sequencing. Use Value: Enables hot-swap capability and graceful shutdown during brownout via precise undervoltage lockout (3.5V threshold) and latchoff control. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-phase synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISL6269CRZ-T | Single-chip dual-phase controller with integrated MOSFET drivers; no external gate drivers required; fixed 300kHz/600kHz options only. | Targeted at mobile CPU VRMs; lacks CLKOUT expansion, remote sensing, and wide frequency tuning. | Choose ISL6269CRZ-T for space-constrained laptop designs where integration outweighs scalability and precision sensing needs. |
| MP2940AGQSE-LF-Z | Supports 3–6 phases natively; includes digital interface (SVID) and telemetry; 0.6V reference with ±0.5% accuracy over temp. | Designed for Intel VR13/VR14 compliance; requires PMBus host; no analog PLLIN/CLKOUT for analog multi-phase stacking. | Choose MP2940AGQSE-LF-Z for server platforms requiring SVID communication and telemetry, not standalone analog PolyPhase expansion. |
Compared with ISL6269CRZ-T and MP2940AGQSE-LF-Z, the LTC3729LEUH-6#TRPBF offers unmatched analog scalability (up to 12 phases), true differential remote sensing for high-current boards, and continuous 250–550kHz frequency tuning-making it optimal for custom high-power industrial and computing power supplies where flexibility and precision outweigh integration convenience.
Availability
LTC3729LEUH-6#TRPBF is available at Aetrix Electronics and suitable for desktop computers, internet servers, and DC power distribution systems requiring stable component supply, long-term lifecycle support, and guaranteed performance across –40°C to 85°C ambient.
Supply support for LTC3729LEUH-6#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. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, formed through the acquisition of Linear Technology in 2017.
The LTC3729L-6 belongs to ADI's high-current PolyPhase® controller product line, designed specifically for scalable, high-efficiency multi-phase DC/DC conversion in computing, data center, and industrial infrastructure applications.
FAQ
What is the operating temperature range guaranteed for the LTC3729LEUH-6#TRPBF?
The LTC3729LEUH-6#TRPBF is tested and guaranteed to meet all electrical specifications over 0°C to 70°C. Performance over the extended –40°C to 85°C ambient range is assured by design, characterization, and statistical process controls per the datasheet Note 6. Junction temperature must not exceed 125°C.
How does the LTC3729LEUH-6#TRPBF achieve true remote output voltage sensing?
The LTC3729LEUH-6#TRPBF uses dedicated VOS+ and VOS– pins connected directly to the positive and negative terminals of the output capacitor. An internal differential amplifier (gain = 0.995–1.005, CMRR = 46–55dB) references this differential voltage to SGND and outputs it on VDIFFOUT, enabling accurate regulation despite PCB trace resistance.
Can the LTC3729LEUH-6#TRPBF operate in single-phase mode?
Yes-the LTC3729LEUH-6#TRPBF can be configured for single-phase operation by connecting both SENSE1± and SENSE2± together and disabling one channel via PHASMD or external gating. However, its dual-phase architecture and interleaved timing are optimized for two-phase use to maximize ripple cancellation and thermal distribution.
What is the purpose of the EXTVCC pin on the LTC3729LEUH-6#TRPBF?
The EXTVCC pin on the LTC3729LEUH-6#TRPBF allows bypassing the internal 5V LDO by supplying an external 4.7–7V source. When EXTVCC exceeds 4.7V, an internal switch connects it to INTVCC, improving efficiency and enabling higher gate drive current-especially useful when powering INTVCC from the regulated output rail.
Does the LTC3729LEUH-6#TRPBF support phase synchronization with external clocks?
Yes-the LTC3729LEUH-6#TRPBF supports full phase synchronization via the PLLIN pin. Its internal phase-locked loop locks the rising edge of TG1 to the rising edge of an external clock applied to PLLIN, enabling precise timing alignment across multiple controllers or with system clocks for EMI reduction.
LTC3729LEUH-6#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- PolyPhase®
- Package/Case:
- 32-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:
- 2
- Output Phases:
- 2
- Voltage - Supply (Vcc/Vdd):
- 4V ~ 30V
- Frequency - Switching:
- 260kHz ~ 550kHz
- Duty Cycle (Max):
- 99.5%
- Synchronous Rectifier:
- Yes
- Clock Sync:
- No
- Serial Interfaces:
- -
- Control Features:
- Current Limit, Enable, Phase Control, Power Good, Soft Start
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-QFN (5x5)
LTC3729LEUH-6#TRPBF FAQ
1.How can I place an order for LTC3729LEUH-6#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3729LEUH-6#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 LTC3729LEUH-6#TRPBF reliable?
The price and inventory of LTC3729LEUH-6#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3729LEUH-6#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3729LEUH-6#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3729LEUH-6#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3729LEUH-6#TRPBF?
LTC3729LEUH-6#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3729LEUH-6#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 LTC3729LEUH-6#TRPBF?
For technical support, including LTC3729LEUH-6#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3729LEUH-6#TRPBF requirements.
6.How does Aetrix verify that LTC3729LEUH-6#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3729LEUH-6#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 LTC3729LEUH-6#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3729LEUH-6#TRPBF?
All LTC3729LEUH-6#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3729LEUH-6#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 LTC3729LEUH-6#TRPBF part is unused and in its original packaging.
Return procedure for LTC3729LEUH-6#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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