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Analog Devices Inc. LTC3716EG#PBF
- Part No.:
- LTC3716EG#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 36-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
LTC3716EG#PBF.pdf
- Description:
- IC REG CTRLR BUCK 36SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,757
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Product details
Overview
LTC3716EG#PBF from Analog Devices (formerly Linear Technology) is a 2-phase, 5-bit VID-programmable, current-mode synchronous step-down switching regulator controller driving two external N-channel MOSFETs. It operates at fixed frequencies from 150kHz to 300kHz, delivers ±1% output voltage accuracy across 0.6V–1.75V, supports true remote differential sensing, and enables active voltage positioning for mobile CPU power delivery.
For engineers reviewing the LTC3716EG#PBF datasheet, LTC3716EG#PBF pinout, LTC3716EG#PBF application, or LTC3716EG#PBF equivalent, this controller is selected for high-current, low-voltage DC/DC conversion where phase interleaving, thermal management, and multi-mode efficiency optimization (PWM/Burst/Cycle Skip) are critical in notebook, server VRM, and telecom POL designs.
Technical Context
The LTC3716EG#PBF implements a constant-frequency, current-mode control architecture with 180° out-of-phase dual channels to reduce input/output RMS ripple and improve transient response. Its OPTI-LOOP™ compensation adapts to wide ranges of output capacitor ESR and capacitance values without external loop tuning.
It integrates a precision differential amplifier (±6mV offset, 90dB CMRR) for true remote sensing, a programmable 5-bit VID decoder supporting mobile CPU voltage codes, and a phase-locked loop (PLLIN/PLLFLTR) for external synchronization or frequency programming via DC voltage (140–310kHz range).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Topology | 2-phase synchronous buck controller - enables interleaved operation for reduced input/output ripple and improved thermal distribution |
| Output Voltage Range | 0.6V to 1.75V via 5-bit VID - directly compatible with Intel mobile CPU voltage identification protocols |
| Frequency Range | 150kHz to 300kHz (programmable) - balances efficiency, size, and EMI; supports external sync via PLLIN |
| Voltage Accuracy | ±1% over temperature - ensures stable core voltage regulation under load transients and thermal drift |
| Sensing Architecture | True differential remote sense (SENSE1±/SENSE2±) - compensates for PCB IR drop in high-current (>40A) applications |
| Operating Modes | PWM, Burst Mode™, Cycle Skip - selectable via FCB pin to optimize light-load efficiency without sacrificing regulation fidelity |
| Package | 36-lead narrow SSOP - thermally enhanced surface-mount package with exposed pad for thermal dissipation (θJA = 85°C/W) |
Pinout & Package
Package: 36-lead narrow-body SSOP (G package), RoHS-compliant, with exposed thermal pad. Designed for high-power density layouts requiring efficient heat transfer to PCB ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RUN/SS | Soft-start timing & shutdown control | Capacitor sets ramp time; <0.8V forces full shutdown; internal 1.2µA current source enables controlled startup |
| SENSE1+/SENSE2+ | Positive current sense inputs | Differential inputs to current comparators; set peak current limit with external RSENSE (VSENSEMAX = 75mV typ) |
| SENSE1–/SENSE2– | Negative current sense inputs | Paired with SENSE+ pins for Kelvin sensing; rejects common-mode noise in high-dI/dt paths |
| EAIN | Error amplifier feedback input | Compares output voltage divider signal to 0.6V reference; determines ITH voltage and thus duty cycle |
| ITH | Error amplifier output & compensation node | Controls both channel current thresholds; used for OPTI-LOOP™ compensation network placement |
| TG1/TG2 | Top gate drivers | Floating high-side N-MOSFET drivers (INTVCC-referenced); support bootstrap operation up to 42V |
| BG1/BG2 | Bottom gate drivers | Ground-referenced N-MOSFET drivers; drive low-side switches with 30–90ns transition times |
| VDIFFOUT | Differential amplifier output | Drives external resistive divider for precise remote-sense VOUT regulation; rail-to-rail capable (0–11V) |
| VID0–VID4 | 5-bit VID code inputs | Accept TTL/CMOS logic levels; internal 40kΩ pull-ups enable direct connection to CPU VID bus |
| PGOOD | Open-drain power-good indicator | Asserts low when EAIN deviates >±10% from setpoint; enables system sequencing and fault reporting |
Key Features
| Feature | Design Value |
|---|---|
| 2-phase antiphase operation | Reduces input capacitor RMS current by ~70% and output voltage ripple amplitude by factor of √2 vs single-phase |
| OPTI-LOOP™ compensation | Enables stable loop response across 10µF–10000µF output capacitors without redesigning compensation network |
| True remote differential sensing | Rejects up to 3V common-mode voltage (0–3V range) with 90dB CMRR; eliminates regulation error from PCB trace resistance |
| Three selectable operating modes | FCB pin selects forced PWM (full load), Burst Mode™ (high light-load efficiency), or Cycle Skip (low-noise discontinuous mode) |
| Internal 5V LDO + EXTVCC switchover | Automatically bypasses internal LDO when EXTVCC >4.7V; supports efficient self-biasing from regulated output or auxiliary winding |
| Overvoltage soft latch | Disables top MOSFET and activates bottom switch on >±10% VOUT excursion; prevents nuisance trips during fast load steps |
Applications
| Mobile CPU Core Power Supply | Server VRM for Multi-Core Processors |
|---|---|
Use Scenario: High-current, dynamically scaled voltage supply for Intel/AMD mobile CPUs requiring VID-based voltage transitions under 10µs. IC Role / Device Role / Timing Role: Dual-phase synchronous buck controller managing 40A+ load with 180° interleaving and active voltage positioning. Use Value: Enables ±1% output accuracy and sub-100ns transient response while reducing input capacitor count by 50% versus single-phase solutions. |
Use Scenario: Scalable, high-efficiency core voltage regulator for dual-socket servers with strict thermal and ripple requirements. IC Role / Device Role / Timing Role: 2-phase controller coordinating parallel power stages across multiple rails with synchronized clocking and shared current sharing. Use Value: Delivers 60A+ total output with <5mV p-p ripple and 30% lower thermal stress per phase compared to monolithic alternatives. |
| Telecom Point-of-Load Converter | Industrial FPGA/ASIC Power Management |
Use Scenario: Compact, high-density POL converter powering DSPs and baseband processors in 4G/5G radio units with wide VIN (5–28V). IC Role / Device Role / Timing Role: Fixed-frequency current-mode controller supporting external sync to system clock and robust overvoltage protection. Use Value: Achieves >92% efficiency at 20A/1.2V with Burst Mode™ extending battery life in portable infrastructure equipment. |
Use Scenario: Programmable, high-precision power supply for Xilinx/Altera FPGAs requiring tight voltage tolerance and dynamic slew rate control. IC Role / Device Role / Timing Role: VID-configurable controller with remote sensing and PGOOD monitoring for system-level power sequencing. Use Value: Guarantees ±1% VCCINT regulation across –40°C to 85°C ambient, enabling reliable configuration and operation of 28nm/16nm devices. |
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 |
|---|---|---|---|
| ISL6269CRZ-T | Integrated 2-phase controller with embedded gate drivers; lacks VID interface and true differential remote sense | Targeted at cost-sensitive notebooks; requires external VID translation logic for CPU compatibility | Choose ISL6269CRZ-T only if gate driver integration reduces BOM count and VID functionality is handled externally |
| TPS546D24RQFPR | Single-chip 2-phase buck converter with PMBus interface; includes telemetry, margining, and digital loop control | Designed for datacenter applications requiring real-time monitoring and firmware-upgradable parameters | Choose TPS546D24RQFPR when digital control, telemetry, and compliance with PMBus 1.3 are mandatory |
Compared with ISL6269CRZ-T and TPS546D24RQFPR, the LTC3716EG#PBF provides superior analog precision (±1% VOUT, 75mV current sense threshold), native VID decoding, and flexible analog compensation-making it optimal for high-performance analog-regulated systems where digital overhead is unnecessary.
Availability
LTC3716EG#PBF is available at Aetrix Electronics and suitable for mobile computing power supplies, server VRMs, telecom POL converters, and industrial FPGA power management requiring stable component supply, long-term lifecycle support, and consistent parametric performance.
Supply support for LTC3716EG#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 full technical and manufacturing continuity for all Linear power products, including rigorous AEC-Q200-aligned reliability testing and automotive-grade qualification pathways.
The LTC3716EG#PBF belongs to Linear's high-performance power controller family, engineered specifically for demanding multiphase CPU and ASIC core voltage regulation where precision, efficiency, and thermal resilience are non-negotiable.
FAQ
What is the maximum supported input voltage for the LTC3716EG#PBF?
The LTC3716EG#PBF supports a wide input voltage range from 4V to 36V. Absolute maximum ratings specify VIN up to 36V, with top-side driver pins (BOOST1/2) rated to 42V. Operation above 30V is feasible but requires careful attention to INTVCC regulation and gate driver biasing stability per the datasheet's electrical characteristics table.
Does the LTC3716EG#PBF support true remote sensing, and how is it implemented?
Yes, the LTC3716EG#PBF implements true remote differential sensing using dedicated SENSE1± and SENSE2± pins per phase, coupled with an integrated differential amplifier (VDIFFOUT, VOS±, AMPMD). This architecture measures voltage directly at the load terminals, rejecting PCB trace resistance errors-critical for maintaining ±1% regulation accuracy in >40A applications.
How does the FCB pin affect operating mode selection in the LTC3716EG#PBF?
The FCB pin selects among three distinct operating modes: grounding forces continuous PWM; pulling below 0.6V enables forced continuous mode for secondary winding regulation; holding between 0.6V and (INTVCC – 2V) activates Burst Mode™ for highest light-load efficiency. The LTC3716EG#PBF datasheet specifies exact thresholds (e.g., VFCB = 0.6V typ) and corresponding current foldback behavior.
Can the LTC3716EG#PBF be synchronized to an external clock, and what pins are involved?
Yes, the LTC3716EG#PBF supports external synchronization via the PLLIN pin, which connects to an internal phase detector. The PLLFLTR pin serves as both the PLL filter node and DC frequency control input-applying 0V–2.4V here sets oscillator frequency from 140kHz to 310kHz. When PLLIN is driven, the rising edge of its signal aligns the top gate turn-on of Channel 1.
What is the purpose of the OPTI-LOOP™ compensation in the LTC3716EG#PBF?
OPTI-LOOP™ compensation in the LTC3716EG#PBF allows stable closed-loop operation across a wide range of output capacitor values (10µF to 10,000µF) and ESR (0.5mΩ to 100mΩ) without manual loop redesign. It achieves this through an adaptive transconductance amplifier stage (gm = 3mmho, GBW = 2MHz) that automatically adjusts phase margin based on COUT/ESR loading conditions.
LTC3716EG#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
- Output Type:
- Transistor Driver
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Number of Outputs:
- 2
- Output Phases:
- 2
- Voltage - Supply (Vcc/Vdd):
- 4V ~ 36V
- Frequency - Switching:
- 140kHz ~ 310kHz
- Duty Cycle (Max):
- 99.5%
- Synchronous Rectifier:
- Yes
- Clock Sync:
- No
- Serial Interfaces:
- -
- Control Features:
- Enable, Power Good, Soft Start
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 36-SSOP
LTC3716EG#PBF FAQ
1.How can I place an order for LTC3716EG#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3716EG#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 LTC3716EG#PBF reliable?
The price and inventory of LTC3716EG#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3716EG#PBF is usually 5 days.
3.What payment methods are accepted for LTC3716EG#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3716EG#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3716EG#PBF?
LTC3716EG#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3716EG#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 LTC3716EG#PBF?
For technical support, including LTC3716EG#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3716EG#PBF requirements.
6.How does Aetrix verify that LTC3716EG#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3716EG#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 LTC3716EG#PBF meets industry standards.
7.What is the process for return or replacement of LTC3716EG#PBF?
All LTC3716EG#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3716EG#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 LTC3716EG#PBF part is unused and in its original packaging.
Return procedure for LTC3716EG#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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