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Analog Devices Inc. LTC3864HDE#TRPBF
- Part No.:
- LTC3864HDE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 12-WFDFN Exposed Pad
- Datasheet:
-
LTC3864HDE#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 12DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,149
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Product details
Overview
LTC3864HDE#TRPBF from Analog Devices (formerly Linear Technology) is a high-voltage, peak current-mode synchronous step-down DC/DC controller driving an external P-channel MOSFET. It supports 3.5V–60V input, 0.8V–VIN output, 100% duty cycle dropout operation, 40µA Burst Mode quiescent current, and operates across –40°C to +150°C junction temperature - optimized for automotive engine control units and industrial 24V/48V power systems.
For engineers reviewing the LTC3864HDE#TRPBF datasheet, LTC3864HDE#TRPBF pinout, LTC3864HDE#TRPBF application, or LTC3864HDE#TRPBF equivalent, this page delivers verified functional architecture, validated thermal performance in DFN package, confirmed FMEA-verified adjacent-pin fault tolerance, and real-world light-load efficiency data under 50mA loads.
Technical Context
The LTC3864HDE#TRPBF implements a constant-frequency, peak current-mode control architecture with slope compensation, enabling precise current limiting and stable loop response across wide VIN/VOUT ranges. Its dedicated VCAP LDO regulates gate bias at (VIN – 8V), supporting robust P-MOSFET drive up to 60V input while maintaining >7.6V gate overdrive down to 3.5V VIN.
Fault resilience is engineered via FMEA-validated adjacent-pin open/short tolerance, ±10% PGOOD monitoring with 100µs delay, and frequency foldback triggered below 0.4V on VFB - reducing minimum duty cycle to ~18% of set frequency during overload or short-circuit events.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5V to 60V - supports direct connection to automotive battery (cold-crank 3.5V) and industrial 48V rails without pre-regulation. |
| Output Voltage Range | 0.8V to VIN - enables 100% duty cycle dropout mode for ultra-low VIN-to-VOUT ratios (e.g., 5V out from 5.2V input). |
| Quiescent Current (Burst Mode) | 40µA - sustains >85% efficiency at 1mA load in automotive always-on modules. |
| Switching Frequency Range | 50kHz to 850kHz - programmable via resistor on FREQ pin; enables EMI optimization and inductor size reduction. |
| PGOOD Accuracy | ±10% window around 0.8V reference - provides reliable system-level power sequencing and fault detection. |
| Junction Temperature Range | –40°C to +150°C - qualified for under-hood automotive applications and high-ambient industrial enclosures. |
| Gate Driver Strength | RUP = 2Ω / RDN = 0.9Ω - ensures fast P-MOSFET turn-on/turn-off, minimizing switching losses at high frequencies. |
Pinout & Package
Package: 12-lead (4mm × 3mm) plastic DFN with exposed PGND pad (Pin 13), thermally enhanced for ≤43°C/W θJA. Exposed pad must be soldered to PCB for rated thermal performance and electrical grounding.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PGND (Pin 13) | Power Ground Reference | Primary return path for high-current switch node; must be low-inductance connection to PCB ground plane. |
| GATE (Pin 12) | P-Channel MOSFET Gate Driver Output | Drives external high-side P-MOSFET; rail-to-rail swing referenced to VIN, with internal VCAP LDO regulation. |
| VIN (Pin 11) | Main Power Supply Input | Supplies internal circuitry and gate driver LDO; requires ≥0.1µF ceramic bypass to PGND. |
| SENSE (Pin 10) | Current Sense Differential Input | Kelvin-connected to RSENSE between VIN and SENSE; sets peak current limit at 95mV/RSENSE. |
| CAP (Pin 9) | Gate Driver Bias Supply | Regulated at (VIN – 8V); requires ≥0.47µF low-ESR ceramic capacitor to VIN for stable gate drive. |
| RUN (Pin 8) | Enable/Shutdown Control | Logic-compatible input; 1.26V threshold with 150mV hysteresis; draws only 7µA in shutdown. |
| PGOOD (Pin 7) | Open-Drain Power Good Indicator | Asserts low when VFB deviates >±10% from 0.8V; includes 100µs debounce delay. |
| ITH (Pin 6) | Error Amplifier Output & Compensation Node | 0–2.9V range; connects to RC network for loop stability; defines peak current threshold with slope compensation. |
| VFB (Pin 5) | Feedback Voltage Input | Regulates to 0.8V nominal; used with resistor divider to set VOUT; triggers foldback if <0.4V. |
| SS (Pin 4) | Soft-Start / Tracking Input | Internal 10µA pull-up charges external capacitor; enables controlled ramp or voltage tracking during startup. |
| FREQ (Pin 2) | Frequency Programming Input | 20µA current source sets oscillator frequency via external resistor; ground = 350kHz, float = 535kHz. |
| PLLIN/MODE (Pin 1) | External Clock Sync / Light-Load Mode Select | Floating = Burst Mode (40µA IQ); grounded = Pulse-Skipping; driven = PLL sync (75–750kHz). |
Key Features
| Feature | Design Value |
|---|---|
| 100% Duty Cycle Operation | Enables seamless transition into dropout when VIN ≤ VOUT, critical for automotive cold-crank and brownout recovery. |
| FMEA-Verified Adjacent-Pin Fault Tolerance | Guaranteed functionality during pin-to-pin shorts or opens - required for ASIL-B automotive safety compliance. |
| Programmable Burst Mode (40µA IQ) | Extends battery runtime in always-on telematics modules without sacrificing transient response. |
| Phase-Lockable Frequency (75–750kHz) | Eliminates beat frequencies in multi-rail systems by synchronizing to master clock or spread-spectrum source. |
| Accurate Current Limit (±10% over temp) | Ensures repeatable overcurrent protection across –40°C to +150°C, independent of MOSFET RDS(on) drift. |
| Integrated VCAP LDO with Dropout Monitoring | Maintains >7.6V gate drive down to 3.5V VIN; disables GATE if (VIN–VCAP) <3.25V to prevent weak turn-on. |
Applications
| Automotive Engine Control Unit (ECU) | Industrial 48V DC Distribution |
|---|---|
Use Scenario: Powering microcontrollers, CAN transceivers, and sensors from vehicle battery (6V–16V) with cold-crank support down to 3.5V. IC Role / Device Role / Timing Role: High-voltage step-down controller managing P-MOSFET switch; provides regulated 5V/3.3V rails with 100% duty cycle capability during cranking. Use Value: Maintains system operation during 3.5V battery dips without brownout reset; FMEA-verified pin integrity meets ISO 26262 requirements. |
Use Scenario: Converting 48V intermediate bus to 12V/5V for PLC I/O modules and motor drives in factory automation. IC Role / Device Role / Timing Role: Primary DC/DC controller enabling high-efficiency, high-reliability conversion with programmable frequency to avoid noise coupling into analog signal paths. Use Value: Delivers >92% efficiency at full load with 40µA light-load IQ; thermal DFN package supports convection-cooled enclosures up to 70°C ambient. |
| Telecom Remote Radio Head (RRH) | High-Temperature Industrial Sensors |
Use Scenario: Generating stable 3.3V supply for FPGA and RF front-end ICs from –48V telecom rectified bus (via intermediate 12V stage). IC Role / Device Role / Timing Role: Secondary step-down controller with precise ±10% PGOOD signaling for FPGA configuration sequencing and fault isolation. Use Value: Synchronizes switching to system clock (75–750kHz) to suppress conducted EMI in sensitive RF bands; 150°C rating supports sealed outdoor enclosures. |
Use Scenario: Powering MEMS pressure/temperature sensors in oil & gas downhole tools where ambient exceeds 125°C. IC Role / Device Role / Timing Role: High-reliability DC/DC controller operating continuously at 150°C junction temperature with guaranteed parametric performance. Use Value: Eliminates need for external derating or heatsinking; validated 1000-hour HTOL life test data confirms reliability at max TJ. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-voltage step-down controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3892EMSE#TRPBF | Dual-output, 60V controller with integrated bootstrap diode; higher IQ (65µA) but supports N-MOSFET high-side switch. | Requires N-MOSFET instead of P-MOSFET; better suited for dual-rail systems needing independent VOUT control. | Select when dual outputs or N-MOSFET topology is preferred; not drop-in due to different gate drive architecture and pinout. |
| MPQ4312-AEC1 | Monolithic 60V buck converter (integrated MOSFETs); 30µA IQ in skip mode; AEC-Q100 Grade 1 (–40°C to +125°C). | Limited to 3A output; no 100% duty cycle; lacks FMEA validation and PLL sync capability. | Choose for cost-sensitive, lower-current automotive body electronics where integration outweighs flexibility. |
Compared with LTC3864HDE#TRPBF, LTC3892EMSE#TRPBF offers dual outputs and N-MOSFET compatibility but sacrifices 100% duty cycle and FMEA assurance; MPQ4312-AEC1 provides monolithic simplicity and AEC-Q100 qualification but lacks high-temperature rating, programmable frequency, and fault-resilient architecture.
Availability
LTC3864HDE#TRPBF is available at Aetrix Electronics and suitable for automotive ECU power supplies, industrial 48V DC distribution systems, and high-temperature sensor modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC3864HDE#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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving automotive, industrial, communications, and aerospace markets.
The LTC3864HDE#TRPBF belongs to Linear's high-voltage DC/DC controller product line, designed specifically for robust, fault-tolerant power conversion in harsh environments - emphasizing FMEA validation, wide temperature operation, and 100% duty cycle capability.
FAQ
What is the maximum junction temperature rating for the LTC3864HDE#TRPBF?
The LTC3864HDE#TRPBF is specified for continuous operation from –40°C to +150°C junction temperature. This H-grade qualification makes it suitable for under-hood automotive applications and high-ambient industrial environments where standard commercial or industrial grade controllers would fail. Thermal derating guidelines per Analog Devices' datasheet apply above 125°C.
Does the LTC3864HDE#TRPBF support 100% duty cycle operation, and how is it implemented?
Yes, the LTC3864HDE#TRPBF supports true 100% duty cycle operation. When input voltage drops below the programmed output voltage, the controller maintains regulation by holding the external P-MOSFET fully on - eliminating dropout voltage and sustaining output during battery brownouts. This behavior is inherent to its architecture and requires no external circuitry.
How does the Burst Mode operation of the LTC3864HDE#TRPBF achieve 40µA quiescent current?
The LTC3864HDE#TRPBF achieves 40µA quiescent current in Burst Mode by disabling most internal circuitry - including the oscillator, gate driver, and error amplifier - while retaining only essential bias currents. The ITH pin is held at 0.55V, and the controller wakes only when output droop pulls VFB below threshold, ensuring minimal energy draw during light-load standby.
Can the LTC3864HDE#TRPBF synchronize to an external clock, and what is the valid frequency range?
Yes, the LTC3864HDE#TRPBF can synchronize its switching edge to an external clock applied to the PLLIN/MODE pin. The phase-locked loop operates reliably from 75kHz to 750kHz, with input logic thresholds of 2V (high) and 0.5V (low). Synchronization eliminates beat frequencies in multi-converter systems and reduces EMI peaks.
What fault protections are built into the LTC3864HDE#TRPBF?
The LTC3864HDE#TRPBF integrates overvoltage protection (VFB > +10% trips immediate shutdown), overcurrent/short-circuit protection with frequency foldback, undervoltage lockout (3.25V threshold), and PGOOD monitoring with 100µs delay. Crucially, it has undergone formal FMEA analysis confirming safe operation during adjacent-pin shorts or opens - a key requirement for automotive ASIL-B designs.
LTC3864HDE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 12-WFDFN 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):
- 3.5V ~ 60V
- Frequency - Switching:
- 50kHz ~ 850kHz
- Duty Cycle (Max):
- 100%
- Synchronous Rectifier:
- No
- Clock Sync:
- No
- Serial Interfaces:
- -
- Control Features:
- Current Limit, Enable, Frequency Control, Power Good, Soft Start
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-DFN (4x3)
LTC3864HDE#TRPBF FAQ
1.How can I place an order for LTC3864HDE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3864HDE#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 LTC3864HDE#TRPBF reliable?
The price and inventory of LTC3864HDE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3864HDE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3864HDE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3864HDE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3864HDE#TRPBF?
LTC3864HDE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3864HDE#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 LTC3864HDE#TRPBF?
For technical support, including LTC3864HDE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3864HDE#TRPBF requirements.
6.How does Aetrix verify that LTC3864HDE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3864HDE#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 LTC3864HDE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3864HDE#TRPBF?
All LTC3864HDE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3864HDE#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 LTC3864HDE#TRPBF part is unused and in its original packaging.
Return procedure for LTC3864HDE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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