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Analog Devices Inc. LTC3732CG#PBF
- Part No.:
- LTC3732CG#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 36-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
LTC3732CG#PBF.pdf
- Description:
- IC REG CTRLR BUCK 36SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,496
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Product details
Overview
LTC3732CG#PBF from Analog Devices (formerly Linear Technology) is a 3-phase, 5-bit VID synchronous buck switching regulator controller designed for high-current CPU/GPU VRM applications. It delivers up to 55A output with ±5% current matching across phases, operates at 250–600kHz per phase, and supports differential remote sensing, Stage Shedding, and Burst Mode for light-load efficiency optimization.
For engineers reviewing the LTC3732CG#PBF datasheet, LTC3732CG#PBF pinout, LTC3732CG#PBF application, or LTC3732CG#PBF equivalent, key selection considerations include its 36-lead SSOP package, 4.5V–32V input range, 1.1V–1.85V VID-programmable output, ±10% PGOOD tolerance, and PLL-synchronizable 3-phase architecture for low-noise, high-transient-response power delivery.
Technical Context
The LTC3732CG#PBF implements a fixed-frequency, current-mode control architecture with three independent PWM channels operating at 120° phase separation. Each channel integrates high-current N-channel MOSFET drivers (TG/BG), a dedicated current sense comparator (SENSE±), and boost-capacitor management for top-side gate drive.
Its OPTI-LOOP® compensation minimizes output capacitance requirements, while the differential amplifier (IN+/IN− → DIFFOUT) enables true Kelvin sensing of both VOUT+ and VOUT−. The FCB pin selects among forced continuous, Burst Mode®, or Stage Shedding operation-each altering ITH-based current threshold behavior and phase activation logic without changing oscillator frequency setpoint.
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 industrial and computing supply rails |
| Output Voltage Range | 1.1V to 1.85V via 5-bit VID DAC (VRM9.0/9.1 compliant) |
| Switching Frequency | 250kHz to 600kHz per phase, PLL-synchronizable - enables noise-sensitive system clock alignment |
| Current Matching | ±5% worst-case error - ensures balanced thermal loading and inductor sizing across all three phases |
| Protection Features | Short-circuit shutdown timer (defeatable), overvoltage soft latch, foldback current limiting, and undervoltage RUN/SS reset (3.3V–4.5V) |
| Package | 36-lead narrow SSOP (0.209") - thermally optimized for high-power density PCB layouts |
Pinout & Package
Package: 36-lead plastic SSOP (G package), 0.209" width, θJA = 95°C/W. Exposed paddle not present - thermal path relies on leadframe conduction and PCB copper area under body.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| VID0–VID4 | 5-bit digital voltage programming inputs | Set regulated output voltage per VRM9.x standard; internal 3µA pull-up prevents floating states |
| SENSE1±–SENSE3± | Differential current sense inputs (3 channels) | Each pair measures voltage drop across dedicated RSENSE to enable per-phase current regulation |
| TG1–TG3 / BG1–BG3 | Top/bottom gate drivers (3 phases) | High-current (5A peak) N-MOS drivers with 30–90ns rise/fall times; TG uses bootstrapped BOOSTx supply |
| IN+, IN− | Differential remote sense inputs | Enable Kelvin sensing at load point - eliminates IR drop errors in high-current PCB traces |
| RUN/SS | Soft-start, run-enable, and short-circuit timer | Capacitor sets ramp time and latches off after timeout if VOUT falls below 70% nominal |
| PGOOD | Open-drain power-good indicator | Asserts low after 100–150µs delay if VOUT deviates >±10% - supports system sequencing and fault reporting |
Key Features
| Feature | Design Value |
|---|---|
| 3-phase interleaving with 120° phase shift | Reduces RMS input/output capacitor currents by ~58%, enabling smaller, lower-ESR bulk capacitors |
| OPTI-LOOP® compensation | Minimizes required output capacitance (COUT) while maintaining stability across load and line variations |
| Stage Shedding mode | Disables two phases below ~10% load - eliminates gate charge and switching losses of inactive stages |
| Differential remote sensing (IN+/IN−) | Rejects common-mode noise and compensates for PCB trace resistance - critical for <1.5V, >30A VRMs |
| Burst Mode® operation | Reduces light-load quiescent current to 25–100µA - extends battery life in portable computing platforms |
Applications
| Desktop CPU Power Delivery | High-Performance Notebook VRM |
|---|---|
|
Use Scenario: Primary 1.1V–1.5V core voltage regulator for Intel/AMD desktop processors delivering up to 55A peak current. IC Role / Device Role / Timing Role: 3-phase synchronous buck controller managing three parallel power stages with precise current sharing and fast transient response. Use Value: Enables compact, low-temperature VRM design with reduced input ripple and improved load-step recovery vs. single-phase solutions. |
Use Scenario: High-efficiency, low-noise core voltage supply for thin-and-light notebooks requiring dynamic voltage scaling and deep sleep modes. IC Role / Device Role / Timing Role: VID-programmable 3-phase controller supporting Burst Mode® and Stage Shedding to maintain >85% efficiency from 1A to full load. Use Value: Extends battery runtime during light loads while preserving fast wake-up response and minimizing audible coil whine. |
| High-Output DC/DC Server PSU | GPU Core Voltage Regulation |
|
Use Scenario: Secondary 1.2V–1.8V rail in modular server power supplies feeding multi-core SoCs or ASICs. IC Role / Device Role / Timing Role: Interleaved controller synchronizing to system clock via PLLIN to suppress conducted EMI in dense rack environments. Use Value: Reduces input filter size and cost while meeting strict CISPR-32 Class B emission limits without shielding. |
Use Scenario: Core voltage regulator for discrete GPUs requiring rapid load transients (0→50A in <1µs) and tight voltage accuracy. IC Role / Device Role / Timing Role: Differential-sense 3-phase controller with ±5% current matching and 600kHz max frequency for minimal output impedance. Use Value: Maintains <±10mV regulation during GPU boost events, preventing throttling and ensuring stable compute performance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 3-phase synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISL6322CRZ-T | 4-phase, 6-bit VID, 0.3–2.0V output range; integrated MOSFET drivers rated for 1.5A sink/source | Supports higher phase count and wider output range but lacks PLL synchronization and differential sensing | Preferred for multi-phase VR12.x systems needing tighter voltage accuracy (<±0.5%) and higher current capability (>70A) |
| TPS53679RSMT | Single-chip 3-phase controller with integrated drivers; supports D-CAP3™ adaptive loop control and PMBus interface | Offers digital telemetry and programmable protection but requires external VID-to-PMBus translation for legacy VRM compatibility | Best for new designs requiring real-time telemetry, firmware updates, and advanced fault logging in datacenter applications |
Compared with LTC3732CG#PBF, ISL6322CRZ-T provides broader VID range and higher phase count but sacrifices differential sensing and PLL sync; TPS53679RSMT adds digital control and telemetry at the cost of analog simplicity and VRM9.x native support.
Availability
LTC3732CG#PBF is available at Aetrix Electronics and suitable for desktop CPU power delivery, high-performance notebook VRMs, high-output DC/DC server PSUs, and GPU core voltage regulation requiring stable component supply and long-term industrial lifecycle support.
Supply support for LTC3732CG#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 with rigorous automotive-grade qualification and long-term product longevity commitments.
The LTC3732CG#PBF belongs to Linear's PolyPhase® controller family, engineered specifically for high-current, low-voltage computing power supplies demanding precision current sharing, fast transient response, and robust thermal management.
FAQ
What is the maximum supported input voltage for the LTC3732CG#PBF?
The LTC3732CG#PBF supports an absolute maximum input voltage of 32V on VIN pins (SW1–SW3). Its recommended operating input range is 4.5V to 32V, making it suitable for 5V, 12V, and 24V intermediate bus architectures. Exceeding 32V risks permanent damage to internal driver circuitry and current sense comparators.
Does the LTC3732CG#PBF support differential remote sensing?
Yes, the LTC3732CG#PBF supports true differential remote sensing via dedicated IN+ and IN− pins. This feature enables Kelvin sensing at the load point, eliminating voltage errors caused by PCB trace resistance - critical for maintaining ±1% regulation accuracy in high-current VRM applications using the LTC3732CG#PBF.
How does the FCB pin affect operating mode in the LTC3732CG#PBF?
The FCB pin on the LTC3732CG#PBF selects among three distinct operating modes: grounding forces continuous conduction mode; floating enables Burst Mode® for ultra-low IQ; tying to VCC activates Stage Shedding. Each mode alters ITH threshold behavior and phase activation logic - all while preserving the same 250–600kHz per-phase base frequency set by PLLFLTR.
What is the purpose of the RUN/SS pin on the LTC3732CG#PBF?
The RUN/SS pin on the LTC3732CG#PBF serves three functions: soft-start timing (via external capacitor), run-enable control, and short-circuit detection timer. During startup, it ramps ITH to limit inrush current; once active, it discharges if VOUT drops below 70% nominal - triggering latch-off after a programmable timeout. This dual-role pin simplifies system-level fault management in the LTC3732CG#PBF.
Can the LTC3732CG#PBF be synchronized to an external clock source?
Yes, the LTC3732CG#PBF supports external synchronization via the PLLIN pin. Its integrated phase-locked loop aligns the rising edge of Controller 1's top-gate signal to the rising edge of the external clock. When no signal is applied, PLLFLTR defaults low, setting oscillator frequency to ~225kHz - enabling deterministic EMI reduction and multi-rail coherence in complex power systems using the LTC3732CG#PBF.
LTC3732CG#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- PolyPhase®
- Package/Case:
- 36-SSOP (0.209", 5.30mm Width)
- 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:
- 36-SSOP
LTC3732CG#PBF FAQ
1.How can I place an order for LTC3732CG#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3732CG#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 LTC3732CG#PBF reliable?
The price and inventory of LTC3732CG#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3732CG#PBF is usually 5 days.
3.What payment methods are accepted for LTC3732CG#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3732CG#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3732CG#PBF?
LTC3732CG#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3732CG#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 LTC3732CG#PBF?
For technical support, including LTC3732CG#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3732CG#PBF requirements.
6.How does Aetrix verify that LTC3732CG#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3732CG#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 LTC3732CG#PBF meets industry standards.
7.What is the process for return or replacement of LTC3732CG#PBF?
All LTC3732CG#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3732CG#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 LTC3732CG#PBF part is unused and in its original packaging.
Return procedure for LTC3732CG#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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