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Analog Devices Inc. LTC3864HDE#PBF
- Part No.:
- LTC3864HDE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 12-WFDFN Exposed Pad
- Datasheet:
-
LTC3864HDE#PBF.pdf
- Description:
- IC REG CTRLR BUCK 12DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,268
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Product details
Overview
LTC3864HDE#PBF 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 operation, 40µA Burst Mode quiescent current, and operates across –40°C to 150°C junction temperature - ideal for automotive engine control units and industrial 24V/48V power rails.
For engineers reviewing the LTC3864HDE#PBF datasheet, LTC3864HDE#PBF pinout, LTC3864HDE#PBF application, or LTC3864HDE#PBF equivalent, key selection criteria include its verified FMEA-compliant adjacent-pin fault tolerance, programmable 50kHz–850kHz switching frequency, integrated gate bias LDO (VIN–VCAP), and dual light-load modes (Burst Mode® vs. pulse-skipping).
Technical Context
The LTC3864HDE#PBF implements a constant-frequency peak current-mode architecture with slope compensation, enabling precise control of switching frequency and accurate current limiting. Its error amplifier (1.8mS transconductance) drives the ITH pin to set peak inductor current, while the VFB pin regulates to 0.8V ±1% over temperature and line.
Fault resilience is engineered via FMEA-verified adjacent-pin open/short robustness, ±10% PGOOD monitoring with 100µs delay, and frequency foldback (to ~18% of set frequency) when VFB drops below 0.4V - ensuring safe start-up and short-circuit recovery without external circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5V to 60V - supports wide automotive battery transients and industrial 48V systems without pre-regulation. |
| Quiescent Current (Burst Mode) | 40µA - enables >90% efficiency at 1mA load, critical for always-on automotive modules. |
| Switching Frequency Range | 50kHz to 850kHz - programmable via resistor on FREQ pin; allows optimization of size (high-f) vs. EMI (low-f). |
| Current Limit Threshold | 95mV (typ.) across RSENSE - provides accurate, temperature-stable overcurrent protection independent of VIN. |
| Operating Junction Temp | –40°C to +150°C - qualified for under-hood automotive applications per AEC-Q100 stress test conditions. |
| Gate Driver Bias (VIN–VCAP) | 8.0V (typ.) regulated LDO - ensures strong P-MOSFET turn-on even at low VIN, supporting 100% duty cycle dropout. |
| PGOOD Accuracy | ±10% window around 0.8V reference - delivers reliable system power sequencing and fault reporting. |
Pinout & Package
Package: 12-lead (4mm × 3mm) plastic DFN with exposed PGND pad (Pin 13), thermally enhanced for high-power density layouts. Exposed pad must be soldered to PCB ground plane for optimal thermal performance (θJC = 5.5°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PLLIN/MODE (1) | External clock sync input / light-load mode select | Floating enables 40µA Burst Mode; grounded selects pulse-skipping; external clock (75–750kHz) synchronizes GATE edge. |
| FREQ (2) | Frequency programming node | Resistor to SGND sets 50–850kHz; grounded = 350kHz; floating = 535kHz - no external oscillator required. |
| SGND (3) | Analog signal ground reference | Must be isolated from PGND except at single-point star connection to avoid noise coupling into feedback loop. |
| SS (4) | Soft-start and output tracking input | Internal 10µA pull-up charges external capacitor for controlled ramp; also accepts resistor divider for supply tracking. |
| VFB (5) | Feedback voltage sense | Regulates to 0.8V ±1%; deviation beyond ±10% asserts PGOOD low after 100µs delay. |
| ITH (6) | Error amplifier output / current threshold | 0–2.9V range sets peak inductor current; connects to compensation network (RITH/CITH1). |
| PGOOD (7) | Open-drain power-good indicator | Pulled low if VFB outside ±10% or RUN = low; requires external pull-up ≤6V. |
| RUN (8) | Enable/disable control | 1.26V threshold with 150mV hysteresis; internal 0.4µA pull-up allows direct connection to 60V supply. |
| CAP (9) | GATE driver bias supply return | Requires ≥0.47µF ceramic cap to VIN; forms LDO filter for stable 8V gate drive (VIN–VCAP). |
| SENSE (10) | Current sense differential input | Kelvin-connected across RSENSE; 95mV threshold enables accurate, layout-insensitive current limiting. |
| VIN (11) | Main power supply input | Supplies internal circuitry and gate driver LDO; requires ≥0.1µF local bypass to PGND. |
| GATE (12) | P-channel MOSFET gate driver output | High-current driver (RUP = 2Ω, RDN = 0.9Ω); disabled if VIN–VCAP < 3.25V (typ.) to prevent weak turn-on. |
| PGND (13) | Power ground (exposed pad) | Primary thermal path and return for high-current paths; must be soldered to PCB ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| FMEA-verified pin fault tolerance | Guaranteed operation during adjacent-pin shorts/opens - eliminates need for external fault analysis in safety-critical automotive designs. |
| 100% duty cycle capability | Enables seamless transition to dropout mode when VIN falls below VOUT - maintains regulation down to VIN = VOUT without output collapse. |
| Programmable light-load mode | Selectable Burst Mode (40µA IQ) or pulse-skipping via PLLIN/MODE pin - balances efficiency vs. output ripple/noise per application requirement. |
| Integrated gate bias LDO | Regulates VIN–VCAP to 8V with <0.5V dropout - ensures robust P-MOSFET gate drive across full input range, including cold-crank 4.5V. |
| Frequency foldback protection | Reduces switching frequency to ~18% of set value when VFB < 0.4V - limits inductor current during short-circuit or overload without external current limiting. |
Applications
| Automotive Engine Control Unit (ECU) | Industrial 48V Distributed Power |
|---|---|
Use Scenario: Powering microcontrollers, CAN transceivers, and sensors in under-hood environments subject to 60V load dump and –40°C to +150°C ambient. IC Role / Device Role / Timing Role: Primary step-down controller regulating 5V/3.3V rails from 12V/24V battery; manages startup sequencing via SS pin and monitors health via PGOOD. Use Value: 150°C rating and FMEA validation eliminate derating or redundancy; 40µA Burst Mode extends battery life in sleep modes. | Use Scenario: Converting 48V intermediate bus to 12V/5V for PLC I/O modules and motor drivers in factory automation cabinets. IC Role / Device Role / Timing Role: High-efficiency, high-reliability controller driving discrete P-MOSFETs; synchronized via PLLIN/MODE to reduce system-level EMI in dense board layouts. Use Value: Wide 3.5–60V input handles brownouts and surges; programmable frequency avoids sensitive frequency bands in servo control systems. |
| Telecom Remote Radio Unit (RRU) | Test Equipment Power Supply |
Use Scenario: Generating stable 3.3V/5V supplies in outdoor base station radios exposed to wide temperature swings and lightning-induced transients. IC Role / Device Role / Timing Role: Main DC/DC controller with precise current limit and PGOOD signaling for FPGA and RF IC power domains. Use Value: ±10% PGOOD accuracy and 100µs delay ensure deterministic power sequencing; frequency foldback prevents thermal runaway during antenna fault conditions. | Use Scenario: Programmable bench power supply channel delivering 0.8–36V at up to 5A with low-noise, fast transient response. IC Role / Device Role / Timing Role: Core controller implementing voltage tracking (via SS pin) and precise current limiting (via SENSE pin) for lab-grade output stability. Use Value: Output tracking enables multi-rail sequencing; 95mV current sense threshold supports accurate 1% current regulation across temperature. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3892HDE#PBF | Dual-output, 60V input, 3.5µA shutdown IQ, but higher 100µA Burst Mode IQ; includes second channel and PMBus interface. | Suitable for dual-rail systems (e.g., 5V + 3.3V) where space permits; not drop-in due to pin count and feature set. | Choose LTC3892HDE#PBF only when dual outputs or digital monitoring are required - adds complexity and cost for single-rail use. |
| MP24894GQKT-LF-Z | Monolithic 60V buck converter (integrated MOSFETs), 30µA IQ, fixed 340kHz frequency, no FMEA validation or 100% duty cycle. | Better for cost-sensitive, lower-current (<3A) applications where board space is constrained and fault tolerance is non-critical. | Choose MP24894GQKT-LF-Z for compact, low-BOM-count designs where external MOSFET drive and FMEA are unnecessary. |
Compared with LTC3892HDE#PBF and MP24894GQKT-LF-Z, the LTC3864HDE#PBF uniquely combines 150°C operation, FMEA validation, 100% duty cycle, and ultra-low 40µA Burst Mode IQ in a single-channel controller - making it the optimal choice for high-reliability, high-temperature automotive and industrial step-down applications requiring discrete P-MOSFET flexibility.
Availability
LTC3864HDE#PBF is available at Aetrix Electronics and suitable for automotive engine control units, industrial 48V distributed power systems, and telecom remote radio units requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC3864HDE#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, Inc. (ADI) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, formed through the acquisition of Linear Technology in 2017.
The LTC3864HDE#PBF belongs to ADI's high-voltage DC/DC controller product line, designed specifically for robust, high-efficiency power conversion in automotive, industrial, and telecom infrastructure where reliability under extreme conditions is mandatory.
FAQ
What is the maximum operating junction temperature for the LTC3864HDE#PBF?
The LTC3864HDE#PBF is rated for continuous operation up to +150°C junction temperature, validated per high-reliability automotive and industrial qualification standards. This rating is explicitly specified in the Order Information table and confirmed in the Absolute Maximum Ratings section of the datasheet, distinguishing it from lower-grade variants (e.g., E/I grade = 125°C).
Does the LTC3864HDE#PBF support 100% duty cycle operation, and how is it implemented?
Yes, the LTC3864HDE#PBF supports true 100% duty cycle operation by driving an external P-channel MOSFET. When VIN drops below the regulated VOUT, the controller sustains conduction without switching - maintaining output regulation through linear pass-through mode. This behavior is enabled by the gate driver's ability to hold the P-MOSFET fully on, as confirmed in the Description and Dropout Behavior sections.
How does the LTC3864HDE#PBF achieve its 40µA quiescent current in Burst Mode?
The LTC3864HDE#PBF achieves 40µA IQ in Burst Mode by disconnecting the error amplifier output from the ITH pin and holding ITH at 0.55V while disabling most internal circuitry. This deep sleep state is triggered when VFB exceeds the 0.8V reference and ITH falls below 0.425V - a mechanism detailed in the Operation section and Electrical Characteristics table (IQ = 40µA typ. in Burst Mode).
Can the LTC3864HDE#PBF be synchronized to an external clock, and what is the supported frequency range?
Yes, the LTC3864HDE#PBF can be synchronized to an external clock applied to the PLLIN/MODE pin. The phase-locked loop supports synchronization from 75kHz to 750kHz, with input logic thresholds of 2V (high) and 0.5V (low). This capability is documented in the Features list, Pin Functions, and Electrical Characteristics tables.
What package type and thermal characteristics apply to the LTC3864HDE#PBF?
The LTC3864HDE#PBF uses a 12-lead (4mm × 3mm) plastic DFN package with exposed PGND pad (Pin 13). Its thermal resistance is θJA = 43°C/W and θJC = 5.5°C/W, requiring soldering of the exposed pad to the PCB ground plane for optimal thermal performance - as specified in the Pin Configuration section and Order Information table.
LTC3864HDE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 12-WFDFN 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):
- 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#PBF FAQ
1.How can I place an order for LTC3864HDE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3864HDE#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 LTC3864HDE#PBF reliable?
The price and inventory of LTC3864HDE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3864HDE#PBF is usually 5 days.
3.What payment methods are accepted for LTC3864HDE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3864HDE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3864HDE#PBF?
LTC3864HDE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3864HDE#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 LTC3864HDE#PBF?
For technical support, including LTC3864HDE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3864HDE#PBF requirements.
6.How does Aetrix verify that LTC3864HDE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3864HDE#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 LTC3864HDE#PBF meets industry standards.
7.What is the process for return or replacement of LTC3864HDE#PBF?
All LTC3864HDE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3864HDE#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 LTC3864HDE#PBF part is unused and in its original packaging.
Return procedure for LTC3864HDE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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