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Analog Devices Inc. LTC3732CG#TRPBF
- Part No.:
- LTC3732CG#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 36-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
LTC3732CG#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 36SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,711
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Product details
Overview
LTC3732CG#TRPBF from Analog Devices (formerly Linear Technology) is a 3-phase, 5-bit VID synchronous buck switching regulator controller designed for high-current CPU/GPU core power delivery. It operates at up to 600kHz per phase with 120° phase separation, supports ±5% output current matching across phases, delivers true remote differential sensing (IN+/IN−), and integrates onboard N-channel MOSFET drivers. It is used in desktop and high-performance notebook VRM systems delivering 1.1V–1.85V at >50A.
For engineers reviewing the LTC3732CG#TRPBF datasheet, LTC3732CG#TRPBF pinout, LTC3732CG#TRPBF application, or LTC3732CG#TRPBF equivalent, key selection criteria include 3-phase current-mode control architecture, VID-programmable output voltage range (1.1V–1.85V), OPTI-LOOP compensation, Stage Shedding/Burst Mode light-load operation, and 36-lead narrow SSOP package thermal performance (θJA = 95°C/W).
Technical Context
The LTC3732CG#TRPBF implements a fixed-frequency, current-mode polyphase architecture with three independent PWM controllers synchronized at 120° phase offset. Each channel uses a dedicated differential current comparator (SENSE1±/2±/3±) referenced to ITH voltage, enabling precise per-phase current regulation and ±5% inter-phase matching.
Its PLL-based frequency control accepts external sync via PLLIN or DC voltage on PLLFLTR (0–2.4V → 250–600kHz), while the 5-bit VID interface decodes VRM9.0/9.1-compliant codes into internal reference voltages. Protection includes foldback current limiting, timed short-circuit shutdown (via RUN/SS capacitor), overvoltage soft latch, and undervoltage reset (3.3–4.5V VCC threshold).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Topology | 3-phase synchronous buck controller with N-channel external MOSFETs |
| Output Voltage Range | 1.1V to 1.85V, programmable via 5-bit VID (VRM9.0/9.1 compliant) |
| Switching Frequency | 250kHz to 600kHz per phase, adjustable via PLLFLTR voltage or external sync |
| Current Matching | ±5% worst-case error across three phases - reduces thermal imbalance and enables smaller magnetics |
| Input Voltage Range | VIN = 4.5V to 32V; VCC supply = 4.5V to 7V - supports wide-input industrial and computing rails |
| Remote Sensing | Differential amplifier (IN+/IN−) with 0.995–1.005 gain and <5mV offset - enables accurate load-point regulation despite PCB IR drop |
| Protection Features | Foldback current limit, timed short-circuit shutdown (RUN/SS timer), overvoltage soft latch, UVLO (3.3–4.5V VCC reset) |
Pinout & Package
Package: 36-lead narrow-body (0.209") SSOP, RoHS-compliant, θJA = 95°C/W. Exposed paddle not present (unlike QFN UHF variant).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VID0–VID4 | 5-bit digital input | Programs regulated output voltage (1.1V–1.85V) per VRM9.0/9.1 standard; internal 3µA pull-up |
| IN+, IN− | Differential sense inputs | Connect directly to load's VOUT+ and VOUT− for true remote sensing - eliminates ground loop errors |
| RUN/SS | Soft-start & fault timer | Capacitor sets ramp time to full load and short-circuit timeout; discharges under severe overload (VOUT < 70%) |
| ITH | Error amplifier output | Common compensation node for all three current comparators - controls peak inductor current per phase |
| PLLIN / PLLFLTR | Synchronization interface | PLLIN accepts external clock; PLLFLTR accepts 0–2.4V DC to set oscillator frequency (250–600kHz) |
| TG1–TG3 / BG1–BG3 | Gate drivers | TGx drive top N-MOSFET gates via bootstrap (BOOSTx); BGx drive bottom N-MOSFET gates from PGND |
| PGOOD | Open-drain status indicator | Pulled low if VOUT deviates >±10% for ≥100µs - provides system-level power-good signaling |
Key Features
| Feature | Design Value |
|---|---|
| 3-phase interleaving with 120° phase shift | Reduces input/output RMS current by ~58%, cutting capacitor size and ESR losses significantly |
| OPTI-LOOP® compensation | Minimizes required output capacitance (COUT) without sacrificing stability or transient response |
| Stage Shedding™ and Burst Mode® | Enables high efficiency across full load range: Stage Shedding for medium loads (10–100%), Burst Mode for ultra-light loads (<10%) |
| Differential remote sensing (IN+/IN−) | Rejects common-mode noise and compensates for PCB trace resistance - critical for sub-1.2V, >50A VRMs |
| True current-mode control per phase | Each phase has independent SENSE± inputs and ITH-referenced current limit - ensures balanced thermal loading |
Applications
| Desktop CPU Core Power | High-Performance Notebook VRM |
|---|---|
Use Scenario: Primary core voltage regulator for Intel/AMD desktop processors requiring >50A at 1.1–1.35V with tight transient response. IC Role / Device Role / Timing Role: 3-phase synchronous buck controller managing three parallel power stages with phase interleaving and VID voltage programming. Use Value: Enables compact, high-efficiency VRM design with reduced input/output ripple, lower thermal stress on MOSFETs and inductors, and compliance with VRM9.x specifications. |
Use Scenario: Core power solution for thin-and-light notebooks with thermal constraints and dynamic CPU frequency scaling. IC Role / Device Role / Timing Role: PolyPhase® controller supporting Burst Mode® and Stage Shedding™ to maintain >90% efficiency from 1A to 50A load range. Use Value: Extends battery life during light loads via Burst Mode®, while delivering fast transient response during turbo boost via 3-phase interleaved architecture. |
| High-Output DC/DC Server PSU | Graphics Processing Unit (GPU) Core Supply |
Use Scenario: Secondary high-current rail in modular server power supplies feeding ASIC/FPGA arrays. IC Role / Device Role / Timing Role: Multi-phase controller implementing differential remote sensing to compensate for long PCB power delivery paths. Use Value: Maintains ±0.5% output regulation despite milliohm-level board resistance - eliminates need for point-of-load converters. |
Use Scenario: Core voltage regulator for discrete GPUs demanding rapid load steps (0→50A in <10µs) and tight voltage tolerance. IC Role / Device Role / Timing Role: Current-mode 3-phase controller with OPTI-LOOP® compensation and fast-response differential sensing loop. Use Value: Achieves <5% undershoot/overshoot during 50A transients while minimizing output capacitor count and board area. |
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 |
|---|---|---|---|
| ISL95812IRZ-T | 4-phase controller; supports Intel IMVP-7/8; no integrated VID DAC - requires external reference | Better suited for newer Intel platforms with IMVP compliance; lacks Burst Mode, relies on DCR sensing only | Select when targeting IMVP-7/8 platforms and needing 4-phase scalability; verify compatibility with existing VID logic. |
| TPS53679RSBT | 6-phase controller; TI's Fusion Digital Power interface; supports PMBus; higher integration (integrated drivers) | Designed for datacenter/server applications with telemetry and dynamic voltage scaling; requires PMBus host | Choose for cloud infrastructure designs requiring real-time telemetry, adaptive voltage positioning, and firmware configurability. |
Compared with ISL95812IRZ-T and TPS53679RSBT, the LTC3732CG#TRPBF offers superior light-load efficiency via Burst Mode® and tighter per-phase current matching (±5%), but lacks digital interface and IMVP/VR12 compliance - making it ideal for legacy VRM9.x desktop/notebook designs where analog simplicity and proven reliability are prioritized.
Availability
LTC3732CG#TRPBF is available at Aetrix Electronics and suitable for desktop motherboard power delivery, high-performance notebook VRMs, and GPU core supply designs requiring stable component supply, long-lifecycle support, and consistent parametric performance across production batches.
Supply support for LTC3732CG#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 full support for its high-performance power management portfolio, including precision analog controllers and monolithic regulators.
The LTC3732CG#TRPBF belongs to Linear's PolyPhase® controller family, engineered specifically for high-current, low-voltage CPU/GPU core power applications requiring phase interleaving, VID compliance, and robust protection in space-constrained computing platforms.
FAQ
What is the operating temperature range for the LTC3732CG#TRPBF?
The LTC3732CG#TRPBF is specified for an operating ambient temperature range of 0°C to 70°C. Its maximum junction temperature is 125°C, and thermal resistance is θJA = 95°C/W in the 36-lead SSOP package. Derating is required above 70°C ambient to maintain safe junction temperatures under full load.
Does the LTC3732CG#TRPBF support synchronization to an external clock source?
Yes, the LTC3732CG#TRPBF supports external synchronization via the PLLIN pin, which connects to an internal phase detector. When an external clock is applied, the controller aligns the rising edge of TG1 with the rising edge of the PLLIN signal. The PLLFLTR pin can also be driven with a DC voltage (0–2.4V) to set frequency without external sync.
How does the LTC3732CG#TRPBF implement light-load efficiency optimization?
The LTC3732CG#TRPBF offers two selectable light-load modes via the FCB pin: Burst Mode® (FCB < 0.6V) for ultra-low quiescent current and Stage Shedding™ (FCB = VCC) for constant-frequency discontinuous operation. Both reduce switching and gate-drive losses below 10% load, with Burst Mode achieving highest efficiency at very light loads.
What protection features are integrated into the LTC3732CG#TRPBF?
The LTC3732CG#TRPBF integrates foldback current limiting, timed short-circuit shutdown (using RUN/SS capacitor), overvoltage soft latch, undervoltage lockout (3.3–4.5V VCC reset), and thermal shutdown. The RUN/SS pin serves dual purpose: soft-start ramp and fault timer - discharging under VOUT < 70% triggers latch-off unless overridden with >5µA current.
Can the LTC3732CG#TRPBF be used with non-VID voltage references?
Yes, the LTC3732CG#TRPBF can operate without VID programming by grounding VID0–VID4 and using the EAIN pin to inject an external reference voltage. The internal 0.6V reference remains active, but EAIN accepts externally derived feedback - enabling custom voltage setpoints outside the 1.1–1.85V VID range when combined with appropriate resistor dividers and sensing.
LTC3732CG#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- PolyPhase®
- Package/Case:
- 36-SSOP (0.209", 5.30mm Width)
- 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:
- 36-SSOP
LTC3732CG#TRPBF FAQ
1.How can I place an order for LTC3732CG#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3732CG#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 LTC3732CG#TRPBF reliable?
The price and inventory of LTC3732CG#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3732CG#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3732CG#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3732CG#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3732CG#TRPBF?
LTC3732CG#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3732CG#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 LTC3732CG#TRPBF?
For technical support, including LTC3732CG#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3732CG#TRPBF requirements.
6.How does Aetrix verify that LTC3732CG#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3732CG#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 LTC3732CG#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3732CG#TRPBF?
All LTC3732CG#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3732CG#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 LTC3732CG#TRPBF part is unused and in its original packaging.
Return procedure for LTC3732CG#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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