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Analog Devices Inc. LTC3732CUHF#PBF
- Part No.:
- LTC3732CUHF#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 38-WFQFN Exposed Pad
- Datasheet:
-
LTC3732CUHF#PBF.pdf
- Description:
- IC REG CTRLR BUCK 38QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,391
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Product details
Overview
LTC3732CUHF#PBF from Analog Devices (formerly Linear Technology) is a 3-phase, 5-bit VID-programmable synchronous buck switching regulator controller with onboard N-channel MOSFET drivers, operating up to 600kHz per phase, supporting 4.5V–32V input and 1.1V–1.85V output, and delivering precise remote sensing for high-current VRM9.x/VRM10.x applications in desktop and notebook CPUs.
For engineers reviewing the LTC3732CUHF#PBF datasheet, LTC3732CUHF#PBF pinout, LTC3732CUHF#PBF application, or LTC3732CUHF#PBF equivalent, this controller enables high-efficiency, low-noise, thermally optimized multiphase power delivery with Stage Shedding, Burst Mode, and PLL synchronization - critical for stable CPU core voltage regulation under dynamic load transients.
Technical Context
The LTC3732CUHF#PBF implements a fixed-frequency, current-mode control architecture across three independent phases with 120° phase separation, using differential amplifiers for true remote sensing of both VOUT+ and VOUT− to eliminate ground-loop errors. Its OPTI-LOOP compensation minimizes output capacitance while maintaining stability across wide load and line variations.
It integrates a 5-bit VID DAC compliant with VRM9.0/9.1, supports programmable oscillator frequency (250–600kHz per phase) via PLLFLTR voltage or external sync on PLLIN, and provides three distinct light-load modes: forced continuous (FCB ≤ 0.6V), Stage Shedding (FCB = VCC), and Burst Mode (FCB floating), each with distinct ITH threshold behavior and efficiency/noise trade-offs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Topology | 3-phase synchronous buck controller with N-channel external MOSFETs |
| Input Voltage Range | 4.5V to 32V - supports wide-range DC inputs including 5V, 12V, and 24V rails |
| Output Voltage Range | 1.1V to 1.85V via 5-bit VID - directly compatible with Intel VRM9.0/9.1 specifications |
| Switching Frequency | 250kHz to 600kHz per phase - adjustable via PLLFLTR voltage or external PLLIN sync |
| Current Sensing | Differential SENSE+ / SENSE− per phase with ±5% matching - ensures balanced thermal loading across phases |
| Protection Features | Short-circuit shutdown timer (defeatable), overvoltage soft latch, foldback current limiting, and undervoltage RUN/SS reset at 3.3–4.5V |
| Remote Sensing | Differential amplifier (IN+/IN− → DIFFOUT) with 0.995–1.005 gain and <5mV offset - eliminates PCB IR drop errors at load point |
Pinout & Package
Package: 38-lead QFN (7mm × 5mm), exposed paddle (SGND), θJA = 34°C/W - optimized for high-power density and thermal performance in compact CPU VRMs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VID0–VID4 | 5-bit VID programming inputs | Set regulated output voltage (1.1V–1.85V); internal 3µA pull-up; must be driven only after VCC is applied |
| TG1–TG3 | Top gate drivers | Floating N-channel drivers with BOOST-referenced swing; drive external high-side MOSFET gates |
| BG1–BG3 | Bottom gate drivers | GND-referenced drivers; sink up to 5A peak; connect directly to MOSFET sources and PGND |
| SENSE1±–SENSE3± | Per-phase current sense inputs | Differential inputs for RSENSE; enable accurate per-phase current monitoring and matching |
| IN+, IN− | Differential output voltage sense inputs | True remote sensing at load terminals; reject ground noise and interconnect losses |
| RUN/SS | Soft-start, run control, short-circuit timer | Capacitor sets ramp time and short-circuit timeout; latches off below 3.2V unless overridden with >5µA |
| PLLIN, PLLFLTR | Phase-lock loop interface | PLLIN accepts external sync signal; PLLFLTR sets frequency (0–2.4V → 250–600kHz) or receives phase detector output |
| PGOOD | Open-drain power-good indicator | Asserts low when VOUT deviates >±10% for ≥100µs - meets VRM timing requirements |
Key Features
| Feature | Design Value |
|---|---|
| 3-phase interleaving with 120° phase shift | Reduces RMS input/output capacitor current by ~58%, enabling smaller, lower-ESR bulk capacitors |
| Stage Shedding mode | Disables two phases below ~10% load - eliminates gate charge and switching losses while preserving constant frequency |
| OPTI-LOOP compensation | Minimizes required output capacitance without sacrificing transient response or stability margin |
| Differential remote sensing (IN+/IN−) | Rejects PCB trace resistance errors and isolates signal ground from power ground - essential for VRM accuracy |
| VID DAC with ±0.25% attenuation error | Ensures tight output voltage accuracy across full 5-bit code range, independent of DAC linearity drift |
| Thermal-aware package | 38-lead QFN with exposed SGND paddle (θJA = 34°C/W) - enables reliable operation at 55A total output with proper PCB copper |
Applications
| Desktop CPU Power Delivery | Notebook High-Performance Core VRM |
|---|---|
Use Scenario: Primary 3-phase core voltage regulator for Intel LGA115x/1200/1700 and AMD AM4/AM5 desktop processors requiring VRM9.x compliance. IC Role / Device Role / Timing Role: 3-phase synchronous buck controller managing up to 55A total output with VID-programmed voltage scaling and dynamic phase shedding. Use Value: Enables <1% output voltage regulation error under 50A load steps, with <100µs PGOOD assertion delay and thermal derating support up to 70°C ambient. |
Use Scenario: Compact, high-efficiency core power solution for thin-and-light notebooks with dual-core or quad-core mobile CPUs. IC Role / Device Role / Timing Role: Multiphase controller implementing Burst Mode at light loads (<1A) and Stage Shedding at medium loads (1–5A) to meet CoC Tier 2 efficiency targets. Use Value: Achieves >90% efficiency at 1A and >85% at 20A with 12V input, reducing thermal footprint and extending battery runtime during burst workloads. |
| High-Current FPGA/ASIC Core Supply | Server Board VRM Reference Design |
Use Scenario: Core rail supply for Xilinx Kintex/Virtex or Intel Stratix FPGAs with dynamic current demands exceeding 40A. IC Role / Device Role / Timing Role: Current-mode controller with fast transient response (≤10µs recovery from 0→50A step) and differential sensing to maintain <±5mV regulation at die pad. Use Value: Eliminates need for external current-sharing ICs; ±5% per-phase current matching reduces inductor and MOSFET thermal stress. |
Use Scenario: Reference VRM implementation for server motherboard designs targeting Intel VRM10.x and IMVP8 specifications. IC Role / Device Role / Timing Role: Programmable 3-phase controller supporting PLL synchronization to system clock and VID updates via SMBus-compatible interface. Use Value: Provides validated layout guidelines, thermal design rules, and BOM templates - accelerating qualification for PCIe Gen5 and DDR5 memory subsystems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multiphase buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISL6322IRZ | 4-phase controller with integrated MOSFET drivers; supports 0.3–2.0V output; no VID DAC - requires external DAC or SMBus interface | Targeted at server VRMs with higher phase count; lacks native VRM9.x VID mapping | Choose ISL6322IRZ for 4-phase scalability and tighter voltage tolerance (±0.5%) but accept added complexity for VID translation |
| MP2940AGQ | 3-phase controller with digital PWM, PMBus 1.3 interface, and built-in telemetry; supports 0.25–5.5V output; no analog PLLIN sync | Designed for smart power systems requiring real-time current/voltage/temperature reporting | Choose MP2940AGQ when digital monitoring, fault logging, or adaptive voltage positioning (AVP) are required - not for analog-only VRM designs |
Compared with LTC3732CUHF#PBF, ISL6322IRZ offers higher phase count but requires external VID handling, while MP2940AGQ adds digital telemetry at the cost of analog flexibility and PLL synchronization - making LTC3732CUHF#PBF optimal for cost-sensitive, analog VRM9.x-compliant desktop/notebook designs.
Availability
LTC3732CUHF#PBF is available at Aetrix Electronics and suitable for desktop CPU power delivery, high-performance notebook VRMs, FPGA core supplies, and server board reference designs requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LTC3732CUHF#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 acquired Linear Technology in 2017 and maintains its high-performance power management portfolio, emphasizing precision, efficiency, and reliability in analog-intensive applications.
The LTC3732CUHF#PBF belongs to Linear's PolyPhase® controller family, designed specifically for high-current, low-voltage CPU/GPU/ASIC core power delivery with emphasis on VRM compliance, thermal balancing, and transient response.
FAQ
What is the maximum supported output current for LTC3732CUHF#PBF?
The LTC3732CUHF#PBF itself does not set absolute current limits - it controls external N-channel MOSFETs. In typical 3-phase implementations with appropriate MOSFETs and layout, LTC3732CUHF#PBF supports up to 55A total output current, as validated in Figure 1 of the datasheet with 1µH inductors and 470µF output capacitance.
Does LTC3732CUHF#PBF support VRM10.x specifications?
LTC3732CUHF#PBF is explicitly designed for VRM9.0/9.1 compliance, with 5-bit VID decoding covering 1.1V–1.85V in 10mV steps. It does not natively support VRM10.x's 6-bit VID or AVP (Adaptive Voltage Positioning) features - those require newer controllers like LTC3875 or digital alternatives.
How does the Stage Shedding mode operate in LTC3732CUHF#PBF?
In LTC3732CUHF#PBF, Stage Shedding activates when the FCB pin is tied to VCC. Below ~10% of full load, phases 2 and 3 disable while phase 1 operates in discontinuous conduction mode; below ~1% load, additional cycle skipping occurs - reducing gate drive and switching losses without introducing Burst Mode noise.
What is the purpose of the PADDLE pin on the LTC3732CUHF#PBF QFN package?
The PADDLE pin on LTC3732CUHF#PBF is the exposed metal thermal pad on the underside of the 38-lead QFN package. It is internally connected to SGND and must be soldered to a dedicated SGND copper area on the PCB to achieve θJA = 34°C/W and ensure safe operation at full load.
Can LTC3732CUHF#PBF synchronize to an external clock source?
Yes - LTC3732CUHF#PBF supports external synchronization via the PLLIN pin, which accepts TTL/CMOS-compatible clock signals. The internal phase-locked loop aligns the rising edge of TG1 to the rising edge of the PLLIN signal, enabling coherent multi-rail timing in complex power systems.
LTC3732CUHF#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 ~ 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#PBF FAQ
1.How can I place an order for LTC3732CUHF#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3732CUHF#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 LTC3732CUHF#PBF reliable?
The price and inventory of LTC3732CUHF#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3732CUHF#PBF is usually 5 days.
3.What payment methods are accepted for LTC3732CUHF#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3732CUHF#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3732CUHF#PBF?
LTC3732CUHF#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3732CUHF#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 LTC3732CUHF#PBF?
For technical support, including LTC3732CUHF#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3732CUHF#PBF requirements.
6.How does Aetrix verify that LTC3732CUHF#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3732CUHF#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 LTC3732CUHF#PBF meets industry standards.
7.What is the process for return or replacement of LTC3732CUHF#PBF?
All LTC3732CUHF#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3732CUHF#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 LTC3732CUHF#PBF part is unused and in its original packaging.
Return procedure for LTC3732CUHF#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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