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Analog Devices Inc. LTC3867EUF#PBF
- Part No.:
- LTC3867EUF#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 24-WFQFN Exposed Pad
- Datasheet:
-
LTC3867EUF#PBF.pdf
- Description:
- IC REG CTRLR BUCK 24QFN
- Quantity:
- Payment:
- Shipping:
Inventory:940
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Product details
Overview
LTC3867EUF#PBF 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 to minimize output transients, programmable 30mV–75mV current sense threshold, and operates from 4V to 38V input to regulate 0.6V–14V outputs-used in telecom power supplies requiring tight load regulation under fast transient loads.
For engineers reviewing the LTC3867EUF#PBF datasheet, LTC3867EUF#PBF pinout, LTC3867EUF#PBF application, or LTC3867EUF#PBF equivalent, key selection considerations include its 24-lead QFN package, 200kHz–1.2MHz programmable switching frequency, ±0.75% 0.6V reference accuracy, DCR temperature compensation capability, and support for Burst Mode®, pulse-skipping, and forced continuous operation modes.
Technical Context
The LTC3867EUF#PBF implements a constant-frequency current-mode control loop with an internal error amplifier (EA) whose output (ITH) sets peak inductor current via a programmable sense voltage threshold. Its nonlinear control architecture dynamically adjusts ITH during fast load steps to suppress output voltage excursions without clock latency penalties.
It integrates a high-speed differential remote sense amplifier (DIFFAMP) with ±0.75mV offset and 4MHz unity-gain bandwidth, enabling precise regulation at the load by rejecting PCB trace IR drops. The controller supports DCR-based current sensing with programmable temperature compensation (via ITEMP and ITSD pins) and includes hiccup-mode overcurrent recovery with soft recovery to limit output overshoot.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 4V to 38V - supports wide-input industrial and automotive battery-fed systems without external pre-regulation. |
| VOUT Range | 0.6V to 14V - enables direct generation of core voltages (e.g., 1.2V, 1.5V, 3.3V) and intermediate bus rails. |
| Reference Voltage | 0.6V ±0.75% - ensures ±9mV absolute accuracy over –40°C to 125°C, critical for low-voltage CPU/GPU rail stability. |
| Switching Frequency | 200kHz to 1.2MHz - adjustable via single resistor on FREQ pin; higher frequencies allow smaller magnetics but increase switching losses. |
| Current Sense Threshold | Programmable 30mV to 75mV - accommodates discrete shunts or DCR sensing while minimizing conduction loss. |
| Thermal Protection | Programmable inductor temperature-based shutdown - uses external NTC (ITEMP) and PTC (ITSD) to prevent thermal runaway under sustained overload. |
| Remote Sensing | Differential (DIFF+/DIFF–) with 0.6V reference-referred output - rejects up to 100mV of common-mode noise and eliminates PCB copper loss errors. |
Pinout & Package
Package: 24-lead (4mm × 4mm) plastic QFN with exposed SGND pad (Pin 25), requiring soldering to PCB ground for thermal and electrical 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; enable ±0.75mV sensing accuracy at point-of-load. |
| VFB (5) | Error amplifier inverting input | Compares remote-sensed output to 0.6V reference; regulates VOUT within ±7.5% for PGOOD assertion. |
| ITH (6) | Error amplifier output & current threshold control | Directly programs peak inductor current; slope-compensated for stable current-mode operation. |
| SENSE+ (9) / SENSE– (10) | Current comparator inputs | Accept DCR or RSENSE signals; support bidirectional current monitoring with reverse-current protection. |
| ILIM (11) | Sense voltage limit selection | Four-level programming (GND/FLOAT/1.5V/3.7V/INTVCC) sets max VSENSE from 25mV to 75mV. |
| MODE/PLLIN (23) | Operating mode & PLL sync input | SGND = forced CCM; INTVCC = pulse-skipping; float = Burst Mode®; driven clock = PLL synchronization (250kHz–1.1MHz). |
| TG (20) / BG (17) | Top/bottom N-MOSFET gate drivers | Integrated 2.6Ω/1.5Ω RDS(ON) drivers with <30ns transition times; support >10A load currents with low gate charge loss. |
Key Features
| Feature | Design Value |
|---|---|
| Nonlinear control architecture | Eliminates clock latency during load transients by dynamically adjusting ITH, reducing output deviation by >50% vs standard current-mode control. |
| Programmable DCR temperature compensation | Uses ITEMP pin current (27–33µA) to bias external NTC, maintaining constant current limit across –40°C to +125°C inductor temperature range. |
| Differential remote sense amplifier | 4MHz bandwidth, ±0.75mV offset, and 2V/µs slew rate enable accurate regulation at point-of-load with minimal layout sensitivity. |
| Soft recovery from overcurrent | Hiccup-mode restart with controlled gate drive ramp limits output overshoot to <2% during short-circuit recovery. |
| Pre-biased output start-up | Disables bottom FET until TK/SS > VFB, preventing reverse current flow into pre-charged output capacitors. |
Applications
| Telecom Intermediate Bus | Industrial FPGA Core Supply |
|---|---|
Use Scenario: 48V backplane powering distributed 12V/5V/3.3V intermediate buses in 5G base station chassis. IC Role / Device Role / Timing Role: Primary synchronous buck controller regulating 12V intermediate rail with differential remote sense to compensate for 150mΩ board trace resistance. Use Value: Maintains ±1% output regulation under 0–20A dynamic load steps while suppressing transient excursions to <150mV via nonlinear control. |
Use Scenario: Point-of-load supply for Xilinx Kintex UltraScale+ FPGA requiring 0.85V @ 30A with <±10mV tolerance. IC Role / Device Role / Timing Role: High-accuracy buck controller using DCR current sensing and ITEMP-based thermal derating to sustain 30A continuous current at 85°C ambient. Use Value: Enables single-phase design with 0.6V ±0.75% reference and ±7.5% PGOOD window, eliminating need for external DAC or margining circuitry. |
| Automotive ADAS Domain Controller | Distributed Data Center PSU |
Use Scenario: 12V battery input powering 1.8V vision processor SoC in autonomous driving ECU with strict EMC requirements. IC Role / Device Role / Timing Role: Low-noise buck controller operating in pulse-skipping mode (MODE/PLLIN = INTVCC) to reduce audible switching noise below 20kHz. Use Value: Achieves <15mVpp output ripple at 10A load while meeting CISPR-25 Class 5 conducted emissions limits via controlled dI/dt gate drive. |
Use Scenario: Redundant 48V-to-12V conversion in AI server rack with hot-swap and telemetry requirements. IC Role / Device Role / Timing Role: Synchronized buck controller (PLL locked to system clock) enabling phase interleaving across multiple LTC3867EUF#PBF units for ripple cancellation. Use Value: Reduces total output capacitance by 40% and eliminates beat-frequency artifacts through deterministic 180° phase offset between channels. |
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 |
|---|---|---|---|
| MP2918GL-Z | Fixed 600kHz frequency; no DCR temperature compensation; integrated MOSFET drivers only (no external FET control); lacks differential remote sense. | Targeted at cost-sensitive consumer power bricks-not suitable for precision point-of-load or high-temp industrial use. | Select MP2918GL-Z only for fixed-frequency, low-complexity designs where DCR sensing and thermal derating are unnecessary. |
| ISL81601FRZ-T7A | Supports dual-phase operation and PMBus interface; wider VIN (4.5V–60V); ±0.5% reference; no nonlinear control or ITEMP-based thermal shutdown. | Designed for digital power management in servers-requires MCU firmware integration and adds complexity for analog-only systems. | Choose ISL81601FRZ-T7A when digital telemetry, multi-phase scaling, or >38V input is required; avoid if analog simplicity and hiccup-mode recovery are priorities. |
Compared with MP2918GL-Z and ISL81601FRZ-T7A, the LTC3867EUF#PBF uniquely combines differential remote sensing, programmable DCR temperature compensation, and nonlinear transient suppression-making it optimal for high-accuracy, thermally demanding analog power systems where firmware-free operation is essential.
Availability
LTC3867EUF#PBF is available at Aetrix Electronics and suitable for telecom infrastructure, industrial FPGA power, automotive ADAS, and data center distributed power applications requiring stable component supply, long-term lifecycle assurance, and AEC-Q200-aligned reliability screening.
Supply support for LTC3867EUF#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 analog IC portfolio, emphasizing precision power management, signal conditioning, and RF solutions for mission-critical systems.
The LTC3867EUF#PBF belongs to Linear's high-efficiency synchronous buck controller family, designed specifically for high-current, low-voltage point-of-load regulation in telecom, industrial, and automotive applications where thermal robustness and transient immunity are non-negotiable.
FAQ
What is the maximum supported switching frequency for the LTC3867EUF#PBF?
The LTC3867EUF#PBF supports a programmable switching frequency range from 200kHz to 1.2MHz via a resistor on the FREQ pin. At RFREQ = 23.2kΩ, frequency reaches 1.2MHz (maximum); at RFREQ = 75.0kΩ, it drops to 200kHz (minimum). The device also supports PLL synchronization to external clocks from 250kHz to 1.1MHz when MODE/PLLIN is driven.
Does the LTC3867EUF#PBF support DCR current sensing with temperature compensation?
Yes, the LTC3867EUF#PBF supports DCR current sensing with full temperature compensation. The ITEMP pin sources 27–33µA to bias an external NTC thermistor placed near the inductor, while the ITSD pin provides 20µA for a PTC-based thermal shutdown function-both ensuring constant current limit and safe thermal shutdown across –40°C to 125°C.
How does the nonlinear control architecture in the LTC3867EUF#PBF improve transient response?
The nonlinear control architecture in the LTC3867EUF#PBF dynamically increases the ITH voltage during fast load steps-bypassing traditional clock-latency limitations. This allows immediate adjustment of peak inductor current, reducing output voltage deviation by more than 50% compared to standard current-mode controllers under 10A/µs load transients.
Can the LTC3867EUF#PBF start up into a pre-biased output?
Yes, the LTC3867EUF#PBF supports controlled start-up into pre-biased outputs. When enabled, it disables the bottom MOSFET until the TK/SS voltage exceeds VFB, preventing reverse current flow from the output capacitor into the converter-critical for hot-swap and redundant power systems.
What package type and thermal characteristics does the LTC3867EUF#PBF use?
The LTC3867EUF#PBF uses a 24-lead 4mm × 4mm plastic QFN package with an exposed SGND pad (Pin 25). Thermal resistance is θJC = 4.5°C/W (junction-to-case) and θJA = 47°C/W (junction-to-ambient), requiring the exposed pad to be soldered to a thermal pad on the PCB for rated performance and reliable operation up to 125°C junction temperature.
LTC3867EUF#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-WFQFN Exposed Pad
- Packaging:
- Tube
- 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#PBF FAQ
1.How can I place an order for LTC3867EUF#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3867EUF#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 LTC3867EUF#PBF reliable?
The price and inventory of LTC3867EUF#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3867EUF#PBF is usually 5 days.
3.What payment methods are accepted for LTC3867EUF#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3867EUF#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3867EUF#PBF?
LTC3867EUF#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3867EUF#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 LTC3867EUF#PBF?
For technical support, including LTC3867EUF#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3867EUF#PBF requirements.
6.How does Aetrix verify that LTC3867EUF#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3867EUF#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 LTC3867EUF#PBF meets industry standards.
7.What is the process for return or replacement of LTC3867EUF#PBF?
All LTC3867EUF#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3867EUF#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 LTC3867EUF#PBF part is unused and in its original packaging.
Return procedure for LTC3867EUF#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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