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Analog Devices Inc. LTC3719EG#PBF
- Part No.:
- LTC3719EG#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Special Purpose Regulators
- Package:
- 36-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
LTC3719EG#PBF.pdf
- Description:
- IC REG CTRLR AMD 1OUT 36SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,730
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Product details
Overview
LTC3719EG#PBF from Analog Devices (formerly Linear Technology) is a 2-phase, VID-programmable, synchronous step-down switching regulator controller driving two external N-channel MOSFETs in fixed-frequency current-mode architecture. It delivers up to 45A output at 0.8V–1.55V with ±1% voltage accuracy, true remote differential sensing, and programmable 150kHz–300kHz operation - optimized for AMD Opteron™ CPU core power delivery in servers and workstations.
For engineers reviewing the LTC3719EG#PBF datasheet, LTC3719EG#PBF pinout, LTC3719EG#PBF application, or LTC3719EG#PBF equivalent, this controller enables high-efficiency dual-phase buck conversion with antiphase operation, OPTI-LOOP® compensation, three selectable operating modes (PWM/Burst/Cycle Skip), and integrated overvoltage soft-latch protection - critical for stable high-current CPU VRMs.
Technical Context
The LTC3719EG#PBF implements a constant-frequency, current-mode control architecture with two independent 180° out-of-phase channels. Each channel uses peak-current sensing via dedicated SENSE+/- inputs, error amplifier output (ITH) as shared modulation node, and internal 0.600V reference with ±1% tolerance over temperature.
Its phase-locked loop (PLL) accepts external synchronization via PLLIN and supports frequency tuning from 120kHz to 360kHz through PLLFLTR voltage (0–2.4V). The controller integrates a unity-gain differential amplifier (ADA = 0.995–1.005 V/V, CMRR ≥ 46dB) for true remote sensing and an internal 5V LDO (INTVCC) with EXTVCC switchover at 4.7V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage Range | 0.8V to 1.55V, set by 5-bit AMD VID code - enables dynamic CPU core voltage scaling. |
| Output Voltage Accuracy | ±1% over full temperature range - ensures tight regulation under load transients and thermal drift. |
| Switching Frequency | Programmable 150kHz–300kHz (typical 220kHz) - balances efficiency, EMI, and component size. |
| Input Voltage Range | 4V to 36V - supports wide-range industrial and server input rails including 5V, 12V, and 24V systems. |
| Current Sense Threshold | 62mV to 88mV (typ. 75mV) - sets peak inductor current limit per phase with low-loss RSENSE selection. |
| Differential Amplifier Gain | 0.995–1.005 V/V - enables precise remote sensing across PCB traces with <0.5% gain error. |
| Operating Temperature | –40°C to 85°C ambient - qualified for enterprise server and workstation thermal environments. |
Pinout & Package
Package: 36-lead narrow-body SSOP (0.209" width), RoHS-compliant, moisture-sensitive level 3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RUN/SS | Soft-start timer & shutdown control | Capacitor-based ramp controls ITH startup; <0.8V forces shutdown; discharge current triggers short-circuit latchoff. |
| SENSE1+/SENSE2+ | Positive current sense inputs | Connect to high-side of current-sense resistors; referenced to SENSE– for accurate peak-current detection per phase. |
| SENSE1–/SENSE2– | Negative current sense inputs | Return path for differential current sensing; common-mode range extends to 1.1×INTVCC for high-side sensing. |
| ITH | Error amplifier output & current threshold modulator | Shared control voltage (0–2.4V) sets both channels' current limits and regulates output voltage via feedback loop. |
| FCB | Forced continuous mode select | Voltage-selectable: <0.6V → PWM; 0.6–2.8V → Burst Mode; >4.5V → constant-frequency discontinuous mode. |
| TG1/TG2 | Top gate drivers | Floating N-channel drivers (3A peak) with bootstrap supply (BOOST1/2); swing = INTVCC + SW node voltage. |
| BG1/BG2 | Bottom gate drivers | Ground-referenced N-channel drivers (3A peak); drive MOSFET sources directly to PGND. |
| VDIFFOUT | Differential amplifier output | Drives external resistive divider for VID-adjusted output voltage; enables active voltage positioning (AVP). |
| VID0–VID4 | 5-bit VID code inputs | Accept TTL/CMOS logic levels; internal 40kΩ pull-ups allow direct connection to CPU VID bus without external resistors. |
| PGOOD | Power-good monitor | Open-drain output asserts low when EAIN deviates >±10% from 0.6V reference - signals valid regulation to system controller. |
Key Features
| Feature | Design Value |
|---|---|
| 2-phase antiphase operation | Reduces RMS input/output capacitor ripple current by ~70%, enabling smaller CIN/COUT and lower ESR requirements. |
| OPTI-LOOP® compensation | Allows stable loop response across wide range of output capacitor types and ESR values - eliminates need for custom compensation per design. |
| True remote differential sensing | Integrated 2MHz GBW differential amplifier (VOS+/VOS– inputs) compensates for IR drop in high-current PCB paths - maintains ±1% regulation at load point. |
| Three selectable operating modes | PWM (forced continuous), Burst Mode® (high-efficiency light-load), and Cycle Skip (constant-frequency, low-noise) - configurable via single FCB pin voltage. |
| Internal overvoltage soft-latch | Disables top MOSFET and activates bottom MOSFET on >±10% output excursion - prevents nuisance trips while protecting downstream loads. |
| Current foldback during short-circuit | Automatically reduces peak current limit when output drops below 70% nominal - limits MOSFET power dissipation without disabling regulation. |
Applications
| Server CPU Core Power | Workstation GPU VRM |
|---|---|
Use Scenario: High-current, dynamically scaled core voltage for dual-socket AMD Opteron™ platforms with rapid load steps up to 20A/µs. IC Role / Device Role / Timing Role: Dual-phase synchronous buck controller managing two parallel 22.5A phases with antiphase clocking and VID interface. Use Value: Achieves >90% efficiency at 45A/1.25V while reducing input capacitor RMS current by 75% versus single-phase design. |
Use Scenario: Precision core voltage regulation for professional graphics cards requiring tight transient response and AVP support. IC Role / Device Role / Timing Role: Current-mode controller with true remote sensing and OPTI-LOOP® to maintain ±1% output accuracy across wide temperature and load ranges. Use Value: Enables sub-50mV output deviation during 10A load steps via differential feedback and fast 2MHz amplifier slew rate. |
| Industrial Embedded Computing | High-Density Telecom Board Power |
Use Scenario: Reliable 12V-to-1.5V conversion in fanless embedded systems with extended temperature operation and no airflow cooling. IC Role / Device Role / Timing Role: Dual-phase controller with thermal-aware operation (–40°C to 85°C) and integrated overvoltage/short-circuit protection. Use Value: Eliminates need for external protection ICs; current foldback and soft-latch prevent thermal runaway during fault conditions. |
Use Scenario: Space-constrained 48V intermediate bus conversion to 1.5V for ASIC/FPGA cores in multi-board telecom chassis. IC Role / Device Role / Timing Role: Synchronizable controller (PLLIN input) enabling system-wide clock alignment and EMI reduction across multiple VRMs. Use Value: Reduces conducted EMI peaks by 10–15dB through deterministic phase alignment and antiphase ripple cancellation. |
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 |
|---|---|---|---|
| ISL6322IRZ | Fixed 300kHz frequency only; no PLL synchronization; requires external VID DAC; no OPTI-LOOP® compensation. | Designed for Intel VR10/11 platforms; lacks AMD VID native support and remote sensing amplifier. | Choose ISL6322IRZ only for Intel-compatible designs where VID decoding and differential sensing are handled externally. |
| MP2940AGQKT | Integrated MOSFET drivers with lower gate drive strength (1.5A vs 3A); no EXTVCC switchover; VID range limited to 0.6–1.5V. | Targeted at cost-sensitive client CPU VRMs; lacks true remote sensing and has reduced input voltage range (4.5–24V). | Use MP2940AGQKT for compact client platforms where 45A capability and server-grade reliability are not required. |
Compared with ISL6322IRZ and MP2940AGQKT, the LTC3719EG#PBF uniquely combines native AMD VID decoding, integrated differential sensing amplifier, PLL synchronization, and 3A gate drivers - making it the only option supporting full-featured, high-reliability dual-phase Opteron™ core power with minimal external components.
Availability
LTC3719EG#PBF is available at Aetrix Electronics and suitable for server motherboard design, workstation GPU power delivery, and industrial embedded computing applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LTC3719EG#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 and industrial qualification standards.
The LTC3719EG#PBF belongs to Linear's PolyPhase® controller family, engineered specifically for high-current, low-voltage CPU/GPU core power in datacenter and high-end computing systems - emphasizing precision regulation, thermal robustness, and system-level noise control.
FAQ
What is the maximum supported output current for LTC3719EG#PBF?
The LTC3719EG#PBF is a controller-only device and does not define absolute current limits - it supports up to 45A total output by driving two external N-channel MOSFET stages. Peak per-phase current is determined by RSENSE value and internal 75mV current sense threshold. Designers select MOSFETs and inductors rated for their target load, with typical implementations delivering 20–50A using appropriate external components.
Does LTC3719EG#PBF support AMD-specific VID protocols natively?
Yes, the LTC3719EG#PBF includes native 5-bit AMD VID decoding circuitry (VID0–VID4 pins with internal 40kΩ pull-ups and logic thresholds at 0.4V/1.6V). It directly interprets standard AMD Opteron™ VID codes to set output voltage between 0.8V and 1.55V with ±1% accuracy, eliminating need for external VID DAC or level-shifting circuitry.
How does the OPTI-LOOP® compensation in LTC3719EG#PBF simplify design?
OPTI-LOOP® compensation in the LTC3719EG#PBF allows stable closed-loop operation across a wide range of output capacitor ESR and capacitance values - including ceramic, polymer, and electrolytic types - without requiring manual loop compensation adjustments. This reduces design iteration time and improves robustness against component tolerances and aging effects.
Can LTC3719EG#PBF operate with separate input supplies for each phase?
Yes, the LTC3719EG#PBF supports dual-input supply capability. Its current-mode architecture and independent SENSE+/– inputs per phase enable connecting each output stage to a different VIN rail (e.g., 5V and 12V). Load sharing is maintained by adjusting RSENSE values per phase, allowing flexible power distribution in multi-rail systems.
What protection features are integrated into LTC3719EG#PBF?
The LTC3719EG#PBF integrates overvoltage soft-latch (±10% trip), undervoltage lockout (3.33V threshold), short-circuit timeout via RUN/SS capacitor discharge, current foldback during output collapse, and thermal shutdown (TJMAX = 125°C). All protections operate without external components, ensuring reliable fault handling in high-density server and workstation environments.
LTC3719EG#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 36-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Applications:
- Controller, AMD Opteron™
- Voltage - Input:
- 4V ~ 36V
- Number of Outputs:
- 1
- Voltage - Output:
- 0.8V ~ 1.55V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 36-SSOP
LTC3719EG#PBF FAQ
1.How can I place an order for LTC3719EG#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3719EG#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 LTC3719EG#PBF reliable?
The price and inventory of LTC3719EG#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3719EG#PBF is usually 5 days.
3.What payment methods are accepted for LTC3719EG#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3719EG#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3719EG#PBF?
LTC3719EG#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3719EG#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 LTC3719EG#PBF?
For technical support, including LTC3719EG#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3719EG#PBF requirements.
6.How does Aetrix verify that LTC3719EG#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3719EG#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 LTC3719EG#PBF meets industry standards.
7.What is the process for return or replacement of LTC3719EG#PBF?
All LTC3719EG#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3719EG#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 LTC3719EG#PBF part is unused and in its original packaging.
Return procedure for LTC3719EG#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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