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Analog Devices Inc. LTC3867EUF#TRPBF
- Part No.:
- LTC3867EUF#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 24-WFQFN Exposed Pad
- Datasheet:
-
LTC3867EUF#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 24QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,671
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Product details
Overview
LTC3867EUF#TRPBF from Analog Devices (formerly Linear Technology) is a current-mode synchronous step-down DC/DC controller driving all-N-channel MOSFET stages. It features differential remote sensing, nonlinear control architecture, programmable DCR temperature compensation, and operates from 4V to 38V input to regulate 0.6V–14V outputs-used in telecom power supplies requiring tight load regulation under fast transients.
For engineers reviewing the LTC3867EUF#TRPBF datasheet, LTC3867EUF#TRPBF pinout, LTC3867EUF#TRPBF application, or LTC3867EUF#TRPBF equivalent, key selection criteria include its 0.6V ±0.75% reference accuracy, 200kHz–1.2MHz programmable switching frequency, differential remote sense capability, ITEMP/ITSD thermal protection, and support for pre-biased start-up in distributed power systems.
Technical Context
The LTC3867EUF#TRPBF implements a constant-frequency current-mode control loop with an error amplifier output (ITH) setting peak inductor current. Its nonlinear control architecture dynamically adjusts current threshold during transients to suppress output voltage excursions without clock latency penalties.
Differential remote sensing uses DIFF+/DIFF– inputs to reject PCB trace IR drops, feeding a precision 0.6V reference comparator via DIFFOUT. The controller supports three operating modes-Burst Mode®, pulse-skipping, and forced continuous-selected via MODE/PLLIN pin state, and includes integrated PLL synchronization (250kHz–1.1MHz) with on-die loop filter.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 4V to 38V - supports wide-input industrial and telecom rails including 5V, 12V, 24V, and 36V systems. |
| VOUT Range | 0.6V to 14V - enables core logic, FPGA, ASIC, and intermediate bus regulation with ±0.75% reference accuracy. |
| Switching Frequency | 200kHz to 1.2MHz - adjustable via resistor on FREQ pin; higher frequencies reduce inductor size but increase switching loss. |
| Current Sense Threshold | 30mV to 75mV - programmable via ILIM pin; allows use of discrete shunt or DCR sensing with temperature compensation. |
| Remote Sense Accuracy | ±0.75% at 0.6V - achieved via high-impedance, low-offset differential amplifier (DIFFAMP) rejecting up to 100mV common-mode noise. |
| Thermal Protection | Programmable ITEMP-based shutdown + ITSD hiccup mode - prevents MOSFET overtemperature using external NTC/PTC sensors. |
| Package | 24-lead 4mm × 4mm QFN with exposed SGND pad - provides low θJA = 47°C/W for thermally demanding 10A+ applications. |
Pinout & Package
24-lead (4mm × 4mm) plastic QFN package with exposed signal ground pad (Pin 25), soldered directly to PCB for electrical integrity and thermal performance (θJC = 4.5°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RUN (1) | Enable control input | 1.22V threshold with 1µA pull-up; releases internal soft-start and enables gate drivers when asserted. |
| DIFF+ (2), DIFF– (3) | Differential remote sense inputs | Connect across output load to reject PCB IR drop; feed DIFFOUT for precise VOUT regulation at point-of-load. |
| VFB (5) | Error amplifier inverting input | Compares remote-sensed output to 0.6V reference; regulates output within ±0.75% over temp and line/load. |
| ITH (6) | Current threshold & EA compensation node | Output of error amplifier; sets peak inductor current; accepts RC compensation network for loop stability. |
| TK/SS (8) | Soft-start/tracking control | 1.25µA internal current charges external capacitor; controls VOUT ramp rate or enables supply tracking. |
| SENSE+ (9), SENSE– (10) | Current sense comparator inputs | Accept DCR or RSENSE signals; support programmable 30–75mV threshold with temperature compensation. |
| ILIM (11) | Sense threshold programming | Selects max current sense voltage (GND = 30mV, INTVCC = 75mV) for DCR or shunt configurations. |
| ITEMP (13) | NTC bias for DCR compensation | Connects to external NTC near inductor; enables constant current limit across –40°C to 125°C. |
| EXTVCC (14) | External bias input | Bypasses internal 5.3V LDO when >4.7V applied; improves efficiency by reducing driver power loss. |
| TG (20), BG (17) | Top/bottom gate drivers | Drive N-MOSFET gates with 2.6Ω/1.5Ω RDS(ON); support bootstrap (BOOST) and synchronous rectification. |
| PGOOD (22) | Power-good open-drain output | Pulls low when VFB deviates >±7.5% from 0.6V or RUN is inactive; enables system sequencing and fault reporting. |
Key Features
| Feature | Design Value |
|---|---|
| Nonlinear transient control | Eliminates clock latency during load steps, reducing output voltage excursion by up to 50% vs. standard current-mode controllers. |
| Differential remote sensing | Rejects up to 100mV of PCB trace voltage drop between IC and load, enabling <±1% total output regulation error. |
| Programmable DCR temperature compensation | Maintains constant current limit across –40°C to 125°C using external NTC, preventing thermal runaway in high-current designs. |
| Pre-biased output start-up | Enables safe turn-on into existing output voltage (e.g., hot-swap, redundant supplies) without reverse current or overshoot. |
| Hiccup-mode overcurrent recovery | Soft-restarts after short-circuit by limiting duty cycle and monitoring VFB; avoids destructive latch-off or thermal stress. |
Applications
| Telecom Intermediate Bus | Industrial PLC Power |
|---|---|
Use Scenario: Regulating 12V intermediate bus from 48V backplane in 1U telecom shelf with strict ripple and transient response requirements. IC Role / Device Role / Timing Role: Primary synchronous buck controller managing 10A load with differential remote sense at FPGA power pins. Use Value: Achieves <1% total output error under 5A/µs load steps and 40°C–85°C ambient, enabled by nonlinear control and 0.6V ±0.75% reference. | Use Scenario: Generating isolated 3.3V/5V rails for I/O modules in factory automation PLCs with wide input variation (24V ±20%). IC Role / Device Role / Timing Role: High-efficiency step-down controller supporting Burst Mode® for standby and forced CCM for real-time I/O. Use Value: Delivers >92% efficiency at full load and <15µA shutdown current, extending uptime during brownouts via robust UVLO (3.2V) and EXTVCC bypass. |
| Automotive ADAS Domain Controller | Distributed Data Center PSU |
Use Scenario: Powering vision processor SoCs in automotive camera ECU where thermal margin is constrained and EMC is critical. IC Role / Device Role / Timing Role: Synchronous buck controller with PLL synchronization to system clock to eliminate beat frequencies in sensitive analog front-ends. Use Value: Reduces conducted EMI by aligning switching edges with master clock; supports 600kHz fixed frequency with <10ns jitter via integrated PLL filter. | Use Scenario: Scalable 12V-to-1.8V conversion in modular server power delivery networks with multiple parallel phases. IC Role / Device Role / Timing Role: Phase-matched controller supporting current sharing and thermal derating via ITEMP/ITSD feedback. Use Value: Enables coordinated thermal shutdown across phases using shared NTC network, preventing single-point failure in multi-rail systems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous step-down controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8640S | Integrated 4A MOSFETs; 3.4V–42V input; Silent Switcher® architecture reduces EMI; no differential remote sense. | Better for space-constrained, low-EMI applications where integrated FETs suffice; unsuitable for >10A or remote-sense-critical loads. | Choose LT8640S when board area and EMI compliance outweigh need for remote sensing or >10A scalability. |
| MP2918 | Monolithic 12A buck; 4.5V–18V input; PMBus interface; no nonlinear control or DCR compensation. | Preferred for digital power management with telemetry and dynamic voltage scaling; lacks analog precision for telecom-grade regulation. | Choose MP2918 when digital control, telemetry, and compact monolithic design are prioritized over analog transient fidelity. |
Compared with LT8640S and MP2918, the LTC3867EUF#TRPBF uniquely delivers differential remote sensing, nonlinear transient suppression, and programmable DCR temperature compensation-making it optimal for high-accuracy, high-current, analog-controlled power systems where point-of-load regulation and thermal robustness are non-negotiable.
Availability
LTC3867EUF#TRPBF is available at Aetrix Electronics and suitable for telecom infrastructure, industrial PLCs, automotive ADAS domain controllers, and distributed data center power systems requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for LTC3867EUF#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, Inc. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, formed through the acquisition of Linear Technology in 2017.
The LTC3867EUF#TRPBF belongs to ADI's Power by Linear™ high-performance DC/DC controller family, designed specifically for demanding intermediate bus and point-of-load applications requiring precision regulation, fast transient response, and robust thermal management in telecom, industrial, and automotive environments.
FAQ
What is the minimum recommended input voltage for stable operation of the LTC3867EUF#TRPBF?
The LTC3867EUF#TRPBF has a guaranteed operating input range of 4V to 38V. Its undervoltage lockout (UVLO) activates at 3.2V falling on INTVCC, and the controller remains disabled until INTVCC rises above 3.4V. Below 4V, gate drive strength degrades and oscillator frequency drifts; thus, 4V is the practical minimum for full-spec operation. For dropout scenarios near VOUT, the internal dropout detector forces periodic top-FET off-time to recharge the bootstrap capacitor.
How does the nonlinear control architecture in the LTC3867EUF#TRPBF improve transient response?
The LTC3867EUF#TRPBF's nonlinear control architecture dynamically increases the current sense threshold during rapid load steps-via the IFAST pin-bypassing traditional clock-cycle latency. This allows immediate adjustment of peak inductor current within the same switching cycle, reducing output voltage undershoot/overshoot by up to 50% compared to linear current-mode controllers. The trip threshold is set by a resistor from IFAST to SGND, enabling design-tailored transient stiffness without loop compensation changes.
Can the LTC3867EUF#TRPBF be used with DCR current sensing, and how is temperature compensation implemented?
Yes, the LTC3867EUF#TRPBF fully supports DCR current sensing. Temperature compensation is implemented by connecting an NTC thermistor from ITEMP to SGND and routing its bias current (27–33µA) through the inductor's DCR network. As inductor temperature rises, the NTC resistance drops, increasing the effective sense voltage to offset DCR's positive tempco-maintaining constant current limit from –40°C to 125°C. The ILIM pin selects full-scale sense threshold (30–75mV), and ITEMP voltage is internally scaled to match DCR drift.
What are the key differences between Burst Mode®, pulse-skipping, and forced continuous conduction modes on the LTC3867EUF#TRPBF?
The LTC3867EUF#TRPBF selects operating mode via MODE/PLLIN pin state: floating = Burst Mode® (highest light-load efficiency, discontinuous), tied to INTVCC = pulse-skipping (medium efficiency, low ripple), tied to SGND = forced continuous (lowest light-load efficiency, lowest ripple/audio noise). Burst Mode® disables both MOSFETs during sleep, supplying load from output caps; pulse-skipping holds bottom FET off while skipping top-FET pulses; forced CCM allows reverse inductor current. All modes retain full transient response and remote sensing functionality.
Does the LTC3867EUF#TRPBF support synchronization to an external clock, and what are the frequency limits?
Yes, the LTC3867EUF#TRPBF supports PLL synchronization via the MODE/PLLIN pin. When an external clock is applied, the internal PLL locks to frequencies from 250kHz to 1.1MHz. A resistor must remain connected to the FREQ pin to set the initial free-running frequency before lock. During synchronization, the controller operates exclusively in forced continuous mode, and the integrated PLL filter eliminates need for external components. The PLL maintains lock under ±10% frequency deviation and rejects jitter up to 1ns RMS.
LTC3867EUF#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-WFQFN 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):
- 4V ~ 38V
- Frequency - Switching:
- 200kHz ~ 1.2MHz
- Duty Cycle (Max):
- 98%
- 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-QFN (4x4)
LTC3867EUF#TRPBF FAQ
1.How can I place an order for LTC3867EUF#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3867EUF#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 LTC3867EUF#TRPBF reliable?
The price and inventory of LTC3867EUF#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3867EUF#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3867EUF#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3867EUF#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3867EUF#TRPBF?
LTC3867EUF#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3867EUF#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 LTC3867EUF#TRPBF?
For technical support, including LTC3867EUF#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3867EUF#TRPBF requirements.
6.How does Aetrix verify that LTC3867EUF#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3867EUF#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 LTC3867EUF#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3867EUF#TRPBF?
All LTC3867EUF#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3867EUF#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 LTC3867EUF#TRPBF part is unused and in its original packaging.
Return procedure for LTC3867EUF#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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