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Analog Devices Inc. LTC3866IFE#TRPBF
- Part No.:
- LTC3866IFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 24-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC3866IFE#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 24TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,650
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Product details
Overview
LTC3866IFE#TRPBF from Analog Devices is a single-phase current-mode synchronous step-down switching regulator controller driving all-N-channel MOSFETs. It enables sub-milliohm DCR sensing (down to 0.2 mΩ), supports 4.5V–38V input, delivers 0.6V–3.5V output with ±0.5% accuracy, and operates at 250kHz–770kHz. It is used in high-current DC/DC converters for telecom power systems requiring low-noise, high-efficiency regulation.
For engineers reviewing the LTC3866IFE#TRPBF datasheet, LTC3866IFE#TRPBF pinout, LTC3866IFE#TRPBF application, or LTC3866IFE#TRPBF equivalent, key selection criteria include its differential remote sense amplifier, programmable 10–30 mV current limit, DCR temperature compensation, and FE-package thermal performance (θJA = 33°C/W).
Technical Context
The LTC3866IFE#TRPBF implements a proprietary current-sense architecture that processes dual positive inputs (SNSD+, SNSA+) to improve signal-to-noise ratio by 14 dB-enabling stable operation with ultra-low-DCR inductors. Its error amplifier regulates VFB against a precise 0.6 V reference, while ITH voltage sets peak inductor current via current-mode control.
It integrates a high-speed differential amplifier (gain = 0.999–1.002 V/V, GBW = 3 MHz), programmable oscillator (250–770 kHz), and mode-select logic supporting Burst Mode®, pulse-skipping, or continuous conduction-each with distinct light-load efficiency trade-offs confirmed in typical performance curves.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 38 V - supports wide bus voltages including 12 V, 24 V, and 36 V industrial/telecom rails. |
| Output Voltage Accuracy | ±0.5 % at 0.6 V - ensures tight regulation for CPU/GPU core supplies where 3 mV error is critical. |
| Current Sense Threshold | Selectable 10–30 mV in 5 mV steps via ILIM pin - allows precise overcurrent protection scaling with DCR value. |
| Switching Frequency | 250 kHz to 770 kHz - adjustable via FREQ pin; higher frequencies reduce inductor size but increase switching loss. |
| DCR Temp Compensation | Enabled via ITEMP pin with NTC thermistor - maintains constant current limit across –40°C to 125°C junction range. |
| Differential Sense Gain | 0.999–1.002 V/V - minimizes gain error in remote sensing of output voltage at load point. |
| Thermal Shutdown | Die overtemperature protection - disables switching when junction exceeds safe operating limit, preventing latch-up. |
Pinout & Package
The LTC3866IFE#TRPBF is housed in a 24-lead plastic TSSOP (FE package) with exposed pad (Pin 25 = SGND), θJA = 33°C/W. The exposed pad must be soldered to PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FREQ (Pin 1) | Oscillator frequency programming input | 10 µA current source sets frequency; 0.4 V–2.4 V range yields 250–770 kHz - enables EMI optimization. |
| RUN (Pin 2) | Enable/disable control input | 1.22 V threshold with 80 mV hysteresis - provides clean startup/shutdown sequencing without bounce. |
| TK/SS (Pin 3) | Soft-start or tracking ramp input | 1.25 µA internal charge current - creates linear 0–0.6 V ramp for controlled output rise or supply tracking. |
| ITH (Pin 4) | Error amplifier output / current threshold | Voltage directly sets peak inductor current - used for loop compensation and current limiting. |
| VFB (Pin 5) | Feedback input to error amplifier | Compares remote-sensed output to 0.6 V reference - determines regulation setpoint in closed loop. |
| DIFFOUT (Pin 6) | Differential amplifier output | Drives VFB through external divider - enables Kelvin sensing at load to reject IR drop errors. |
| SNSD+ (Pin 9) | Primary DCR sense input | Connects to inductor's DCR filter (R1C1 = L/DCR) - main path for low-noise current sensing. |
| ILIM (Pin 12) | Current limit threshold select | DC voltage sets max sense threshold (10–30 mV) - defines foldback current limit independent of DCR drift. |
| PGOOD (Pin 23) | Power-good open-drain output | Asserts after 20 µs mask timer when VOUT is within ±10 % - signals system ready for downstream sequencing. |
| SGND (Pin 25) | Signal ground reference | Exposed pad tied to PCB ground - required for noise immunity, compensation stability, and thermal dissipation. |
Key Features
| Feature | Design Value |
|---|---|
| Sub-milliohm DCR sensing | Supports inductors with DCR as low as 0.2 mΩ - reduces conduction loss and improves full-load efficiency up to 95 %. |
| Dual-path current sensing | SNSD+ and SNSA+ inputs with matched filtering - deliver 14 dB SNR improvement over conventional single-path sensing. |
| Programmable current limit | 5-step selectable threshold (10–30 mV) via ILIM pin - enables accurate overcurrent protection across temperature and DCR variation. |
| Differential remote sensing | Integrated diffamp (AV = 0.999–1.002, PSRR = 90 dB) - rejects board-level IR drops and improves load regulation to <0.1 %. |
| Three light-load modes | Burst Mode®, pulse-skipping, and CCM selectable via MODE/PLLIN - optimizes efficiency across 0.01 A–30 A load range. |
Applications
| Telecom Power Supply | Industrial DC Distribution |
|---|---|
Use Scenario: 12 V input to 1.5 V/30 A point-of-load converter in 48 V telecom shelf. IC Role / Device Role / Timing Role: Primary synchronous buck controller managing gate drive timing, current sensing, and output regulation. Use Value: Sub-milliohm DCR sensing eliminates sense resistor losses; ±0.5 % VOUT accuracy meets ASIC core voltage tolerance. | Use Scenario: 24 V battery-fed 3.3 V/20 A supply for PLC I/O modules in factory automation. IC Role / Device Role / Timing Role: High-reliability step-down controller with thermal shutdown and output overvoltage protection. Use Value: DCR temperature compensation maintains consistent current limit across –40°C to 85°C ambient. |
| Medical Imaging Power | High-Performance Computing |
Use Scenario: Low-noise 5 V to 0.85 V/40 A VRM for FPGA-based imaging processing unit. IC Role / Device Role / Timing Role: Precision current-mode controller with differential remote sense and soft-start tracking. Use Value: 14 dB SNR enhancement prevents switching jitter from corrupting sensitive analog acquisition paths. | Use Scenario: Multi-phase-compatible 1.2 V/50 A core supply in server CPU VR13-compliant design. IC Role / Device Role / Timing Role: Single-phase building block with CLKOUT synchronization and PLLIN capability. Use Value: Programmable 250–770 kHz frequency allows phase interleaving and EMI spreading without layout change. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3880IUH#TRPBF | Digital PMBus interface, dual output, integrated ADC/MOSFET drivers - larger QFN-40 package, higher BOM cost. | Required for telemetry, margining, and dynamic configuration in datacenter VRMs. | Choose LTC3880 when digital control, fault logging, or multi-rail coordination is needed. |
| MP2918GL-Z | Analog controller with 4.5–36 V input, 0.6–5.5 V output, ±1 % reference - no differential sense, no DCR temp comp, lower max freq (600 kHz). | Suitable for cost-sensitive industrial DC/DC where 0.2 mΩ DCR sensing is unnecessary. | Choose MP2918 where ultra-low-DCR operation and ±0.5 % accuracy are not required. |
Compared with LTC3880IUH#TRPBF and MP2918GL-Z, the LTC3866IFE#TRPBF uniquely balances analog precision (±0.5 % VREF, dual-path DCR sensing) with thermal efficiency (FE package, 33°C/W θJA) - making it optimal for high-current, low-noise analog-intensive applications without digital overhead.
Availability
LTC3866IFE#TRPBF is available at Aetrix Electronics and suitable for telecom power systems, industrial DC distribution, medical imaging equipment, and high-performance computing power supplies requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LTC3866IFE#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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC3866 belongs to Analog Devices' Power by Linear™ synchronous controller family, designed specifically for high-efficiency, high-current DC/DC conversion with ultra-low-DCR sensing and precision regulation in space-constrained environments.
FAQ
What is the maximum supported DCR value for accurate current sensing with the LTC3866IFE#TRPBF?
The LTC3866IFE#TRPBF is optimized for very low DCR inductors down to 0.2 mΩ. While no absolute maximum DCR is specified, practical upper limits depend on achievable signal-to-noise ratio and minimum sense threshold (10 mV). For a 30 A load, DCR > 0.33 mΩ yields >10 mV drop - ensuring reliable operation within the device's 10–30 mV programmable range. Layout and filtering remain critical above 1 mΩ.
Does the LTC3866IFE#TRPBF support synchronization to an external clock?
Yes, the LTC3866IFE#TRPBF supports external clock synchronization via the MODE/PLLIN pin (Pin 24). Applying a clean square wave to this pin forces the internal oscillator into continuous conduction mode and locks its phase to the external source - enabling EMI reduction through frequency alignment in multi-controller systems.
How does the LTC3866IFE#TRPBF implement DCR temperature compensation?
The LTC3866IFE#TRPBF uses the ITEMP pin (Pin 22) to accept current from an NTC thermistor placed near the output inductor. This current (9–11 µA) modulates the current sense threshold to counteract DCR increase with temperature - maintaining constant peak current limit across –40°C to 125°C. Floating or tying ITEMP to INTVCC disables compensation.
What is the purpose of the dual current sense inputs (SNSD+ and SNSA+) on the LTC3866IFE#TRPBF?
The LTC3866IFE#TRPBF uses SNSD+ and SNSA+ to implement a patented dual-path sensing architecture. SNSD+ connects to a filter matching L/DCR for primary current measurement, while SNSA+ uses a 5× faster filter to capture high-frequency noise components. Internal processing subtracts noise, improving SNR by 14 dB - essential for stable regulation with sub-milliohm DCR.
Can the LTC3866IFE#TRPBF operate without an external bootstrap capacitor?
No - the LTC3866IFE#TRPBF requires an external bootstrap capacitor (CB) connected between BOOST and SW pins to bias the floating top-gate driver (TG). Without CB, TG cannot achieve sufficient gate-source voltage to fully enhance the high-side N-MOSFET. The internal dropout detector attempts periodic recharge, but reliable operation mandates proper CB sizing and placement per the datasheet layout guidelines.
LTC3866IFE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Type:
- Transistor Driver
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Number of Outputs:
- 1
- Output Phases:
- 1
- Voltage - Supply (Vcc/Vdd):
- 4.5V ~ 38V
- Frequency - Switching:
- 250kHz ~ 770kHz
- Duty Cycle (Max):
- -
- Synchronous Rectifier:
- Yes
- Clock Sync:
- No
- Serial Interfaces:
- -
- Control Features:
- Current Limit, Enable, Frequency Control, Power Good, Soft Start, Tracking
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-TSSOP
LTC3866IFE#TRPBF FAQ
1.How can I place an order for LTC3866IFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3866IFE#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 LTC3866IFE#TRPBF reliable?
The price and inventory of LTC3866IFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3866IFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3866IFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3866IFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3866IFE#TRPBF?
LTC3866IFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3866IFE#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 LTC3866IFE#TRPBF?
For technical support, including LTC3866IFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3866IFE#TRPBF requirements.
6.How does Aetrix verify that LTC3866IFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3866IFE#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 LTC3866IFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3866IFE#TRPBF?
All LTC3866IFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3866IFE#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 LTC3866IFE#TRPBF part is unused and in its original packaging.
Return procedure for LTC3866IFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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