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Analog Devices Inc. LTC3732CUHF#TRPBF
- Part No.:
- LTC3732CUHF#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 38-WFQFN Exposed Pad
- Datasheet:
-
LTC3732CUHF#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 38QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,612
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Product details
Overview
LTC3732CUHF#TRPBF from Analog Devices (formerly Linear Technology) is a 3-phase, 5-bit VID-programmable synchronous buck switching regulator controller driving external N-channel MOSFETs in fixed-frequency current-mode operation up to 600kHz per phase. It delivers precise ±5% output current matching across phases, supports 4.5V–32V input and 1.1V–1.85V VRM9.x output, and integrates differential remote sensing, OPTI-LOOP compensation, and Stage Shedding/Burst Mode for light-load efficiency - deployed in high-current desktop and notebook CPU power delivery.
For engineers reviewing the LTC3732CUHF#TRPBF datasheet, LTC3732CUHF#TRPBF pinout, LTC3732CUHF#TRPBF application, or LTC3732CUHF#TRPBF equivalent, key selection criteria include 3-phase current-mode control architecture, VID DAC programmability, PLL synchronization capability, thermal performance enabled by QFN-38 package with exposed paddle, and support for stage shedding versus burst mode trade-offs in multi-phase VRM designs.
Technical Context
The LTC3732CUHF#TRPBF implements a constant-frequency, three-channel current-mode control loop with 120° phase interleaving, where each channel's peak inductor current is regulated via ITH voltage and matched within ±5% using dedicated SENSE+/- inputs per phase. Its differential amplifier (AV = 0.995–1.005 V/V, CMRR ≥ 50 dB) enables true remote sensing at both load terminals, eliminating ground-loop errors in high-current VRM layouts.
Frequency is set either by internal oscillator (250–600 kHz per phase), PLL-synchronized to external clock via PLLIN, or externally tuned via DC voltage on PLLFLTR (0–2.4 V). Operating mode - continuous PWM, Burst Mode (FCB < 0.6 V), or Stage Shedding (FCB = VCC) - is selected via the FCB pin, with foldback current limiting and short-circuit shutdown timed by RUN/SS capacitor discharge.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Topology | 3-phase synchronous buck controller with N-channel MOSFET drivers |
| Input Voltage Range | 4.5V to 32V - supports wide-range VRM input rails including 5V, 12V, and 24V systems |
| Output Voltage Range | 1.1V to 1.85V via 5-bit VID DAC - compliant with Intel VRM9.0/9.1 specifications |
| Switching Frequency | 250kHz to 600kHz per phase - adjustable via PLLFLTR voltage or external sync signal |
| Current Matching | ±5% worst-case error between phases - ensures balanced thermal loading and minimized inductor sizing |
| Remote Sensing Accuracy | Differential gain 0.995–1.005 V/V, offset ≤5 mV - maintains tight regulation despite PCB IR drop |
| Protection Features | Short-circuit shutdown timer, overvoltage soft latch, undervoltage RUN/SS reset (3.3–4.5 V), foldback current limit |
Pinout & Package
Package: 38-lead (7mm × 5mm) plastic QFN with exposed thermal paddle (SGND-connected). Thermal resistance θJA = 34°C/W enables high-power density without heatsink in typical 2-oz copper layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VID0–VID4 | 5-bit VID input | Programs output voltage from 1.1V to 1.85V in 25mV steps per VRM9.x standard |
| TG1–TG3 | Top gate drivers | High-side N-MOSFET gate drive outputs with bootstrapped floating supply (BOOST1–3) |
| BG1–BG3 | Bottom gate drivers | Low-side N-MOSFET gate drives referenced to PGND; 30–90 ns rise/fall times |
| SENSE1+ to SENSE3– | Per-phase current sense inputs | Differential inputs for external RSENSE; threshold adjustable via ITH (62–88 mV range) |
| IN+, IN– | Differential voltage sense inputs | True remote sensing of output rail at load point; rejects common-mode noise up to 70 dB |
| PLLIN, PLLFLTR | Phase-lock interface | Accepts external sync clock (PLLIN) or sets frequency via analog voltage (PLLFLTR: 0–2.4 V → 250–600 kHz) |
| RUN/SS | Soft-start & fault timer | Capacitor sets ramp time and short-circuit timeout; latches off below 3.2 V after arming at 3.8–4.5 V |
| PGOOD | Power-good indicator | Open-drain output asserting low if VOUT deviates >±10% for ≥100 µs - used for system sequencing |
Key Features
| Feature | Design Value |
|---|---|
| 3-phase interleaved architecture | Reduces RMS input/output capacitor current by ~58%, enabling smaller bulk capacitance and lower ESR requirements |
| OPTI-LOOP compensation | Minimizes required output capacitance (COUT) while maintaining stability across load and line variations |
| Stage Shedding / Burst Mode selection | FCB pin configures operating mode: full 3-phase (VCC), 1-phase discontinuous (VCC), or hysteretic burst (floating/low) |
| Differential remote sensing | Eliminates voltage error from PCB trace resistance; critical for sub-1.5V, >50A CPU core supplies |
| Integrated short-circuit protection | Timed shutdown via RUN/SS capacitor discharge prevents MOSFET destruction during sustained overload |
| Thermally enhanced QFN package | Exposed paddle tied to SGND provides low-thermal-resistance path (θJA = 34°C/W) for high-efficiency 50A+ designs |
Applications
| Desktop CPU Power Delivery | Notebook High-Performance Core Supply |
|---|---|
Use Scenario: Primary 3-phase VRM supplying Intel Core i7/i9 processors in ATX motherboards with >45A transient demand. IC Role / Device Role / Timing Role: 3-phase synchronous buck controller managing top/bottom gate timing, current balancing, and VID-based voltage scaling. Use Value: ±5% current matching minimizes per-phase inductor size and thermal spread; PLL sync enables coherent multi-rail timing with chipset clocks. |
Use Scenario: Compact, high-efficiency core supply in thin-and-light notebooks requiring dynamic voltage scaling and low-noise operation. IC Role / Device Role / Timing Role: Phase-interleaved controller delivering 1.0–1.35V at up to 35A with Burst Mode for idle power reduction. Use Value: Stage Shedding reduces gate charge loss at light loads; differential sensing compensates for flex-PCB voltage drop between VRM and CPU socket. |
| High-Output Current DC/DC Module | Server Memory/ASIC Auxiliary Rail |
Use Scenario: Standalone 3-phase module powering FPGA or GPU auxiliary rails with strict ripple and transient response specs. IC Role / Device Role / Timing Role: Fixed-frequency current-mode controller with OPTI-LOOP compensation and remote sensing for stable 1.2V/20A output. Use Value: 600kHz max frequency enables small magnetics; 120° phase shift lowers input ripple current, easing EMI filter design. |
Use Scenario: Secondary 1.8V or 1.5V rail for DDR5 memory subsystems or AI accelerator ASICs requiring fast load-step response. IC Role / Device Role / Timing Role: Multi-phase controller supporting rapid VID transitions and accurate current reporting via SENSE pins. Use Value: Differential sensing ensures <±5mV regulation accuracy at load; PGOOD timing (100µs delay) enables safe power sequencing with memory controllers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multi-phase synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISL6322IRZ | 4-phase, supports up to 70A; lacks PLL sync; uses different VID encoding (VRM10); no Stage Shedding | Better suited for higher-current server VRMs but less flexible for notebook thermal constraints | Select when needing 4-phase scalability and VRM10 compliance; avoid if PLL synchronization or Stage Shedding is required. |
| TPS53679RTAT | 3-phase, integrated MOSFET drivers only (no external FET support); supports D-CAP3 control; no differential sensing | Targeted at cost-sensitive, space-constrained designs where external FETs are unnecessary | Choose for simplified layout and lower BOM count in mid-tier notebooks; not suitable for high-efficiency discrete-FET VRMs. |
Compared with ISL6322IRZ and TPS53679RTAT, the LTC3732CUHF#TRPBF uniquely combines 3-phase discrete-FET control, differential remote sensing, PLL synchronization, and dual light-load modes - making it optimal for thermally constrained, high-accuracy VRM9.x implementations where layout integrity and transient fidelity are critical.
Availability
LTC3732CUHF#TRPBF is available at Aetrix Electronics and suitable for desktop motherboard VRMs, high-performance notebook power delivery, and industrial FPGA/ASIC auxiliary supplies requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LTC3732CUHF#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 acquired Linear Technology in 2017 and maintains its high-performance power management portfolio with rigorous automotive and industrial qualification standards.
The LTC3732CUHF#TRPBF belongs to Linear's PolyPhase® controller family, designed specifically for high-current, low-voltage CPU/GPU core supplies demanding precision current sharing, fast transient response, and robust thermal management in compact form factors.
FAQ
What is the maximum supported switching frequency per phase for the LTC3732CUHF#TRPBF?
The LTC3732CUHF#TRPBF supports up to 600kHz per phase when PLLFLTR is biased at 2.4V. At VCC = 5V and TA = 25°C, the nominal frequency is 400kHz (range 360–440kHz), and the full adjustable range spans 250kHz to 600kHz depending on PLLFLTR voltage or external sync signal alignment. This high-frequency capability enables smaller magnetics and faster transient response in VRM9.x designs.
How does the LTC3732CUHF#TRPBF implement remote voltage sensing?
The LTC3732CUHF#TRPBF uses dedicated IN+ and IN– pins feeding a precision unity-gain differential amplifier (AV = 0.995–1.005 V/V, CMRR ≥ 50 dB) to sense voltage directly at the load. This eliminates regulation error caused by PCB trace resistance between the VRM and CPU socket. The DIFFOUT pin provides the amplified difference signal to the error amplifier, ensuring sub-10mV accuracy even under high-current conditions.
What are the three operating modes controlled by the FCB pin on the LTC3732CUHF#TRPBF?
The FCB pin selects among three distinct light-load modes: (1) Forced Continuous Mode (FCB < 0.6V), (2) Burst Mode (FCB floating or < 0.6V with specific bias), and (3) Stage Shedding (FCB = VCC). Each mode trades off efficiency, noise, and transient response - Burst Mode maximizes light-load efficiency, Stage Shedding maintains constant frequency with reduced phase count, and Forced Continuous ensures lowest output ripple at the cost of higher quiescent loss.
Does the LTC3732CUHF#TRPBF support synchronization to an external clock source?
Yes, the LTC3732CUHF#TRPBF supports full phase synchronization via the PLLIN pin, which accepts an external clock signal. The internal phase detector locks the rising edge of Controller 1's top gate signal to the rising edge of the PLLIN input. When no external clock is applied, PLLFLTR defaults low, setting oscillator frequency to minimum (≈225kHz). This feature enables coherent timing across multiple VRMs or with chipset reference clocks.
What thermal advantages does the QFN-38 package of the LTC3732CUHF#TRPBF provide?
The LTC3732CUHF#TRPBF's 38-lead QFN package features an exposed thermal paddle electrically connected to SGND, achieving θJA = 34°C/W - significantly lower than the SSOP-36 variant (θJA = 95°C/W). This allows higher continuous power dissipation without heatsinks in dense PCB layouts, supporting >50A output designs with improved reliability and reduced thermal gradient across phases.
LTC3732CUHF#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 ~ 7V
- Frequency - Switching:
- 225kHz ~ 680kHz
- Duty Cycle (Max):
- 98.5%
- Synchronous Rectifier:
- Yes
- Clock Sync:
- No
- Serial Interfaces:
- -
- Control Features:
- Enable, Power Good, Soft Start
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 38-QFN (5x7)
LTC3732CUHF#TRPBF FAQ
1.How can I place an order for LTC3732CUHF#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3732CUHF#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 LTC3732CUHF#TRPBF reliable?
The price and inventory of LTC3732CUHF#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3732CUHF#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3732CUHF#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3732CUHF#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3732CUHF#TRPBF?
LTC3732CUHF#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3732CUHF#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 LTC3732CUHF#TRPBF?
For technical support, including LTC3732CUHF#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3732CUHF#TRPBF requirements.
6.How does Aetrix verify that LTC3732CUHF#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3732CUHF#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 LTC3732CUHF#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3732CUHF#TRPBF?
All LTC3732CUHF#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3732CUHF#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 LTC3732CUHF#TRPBF part is unused and in its original packaging.
Return procedure for LTC3732CUHF#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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