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Analog Devices Inc. LTC3864EDE#PBF
- Part No.:
- LTC3864EDE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 12-WFDFN Exposed Pad
- Datasheet:
-
LTC3864EDE#PBF.pdf
- Description:
- IC REG CTRLR BUCK 12DFN
- Quantity:
- Payment:
- Shipping:
Inventory:171
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Product details
Overview
LTC3864EDE#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, 40µA quiescent current in Burst Mode, 100% duty cycle operation, and programmable 50kHz–850kHz switching frequency. It is used in automotive power supplies where wide VIN range and low-IQ dropout operation are critical.
For engineers reviewing the LTC3864EDE#PBF datasheet, LTC3864EDE#PBF pinout, LTC3864EDE#PBF application, or LTC3864EDE#PBF equivalent, key selection considerations include its P-MOSFET gate drive capability, FMEA-verified adjacent-pin fault tolerance, ±10% PGOOD accuracy with 100µs delay, 95mV current sense threshold, and thermal performance enabled by its exposed PGND pad in the 4mm × 3mm DFN package.
Technical Context
The LTC3864EDE#PBF implements a constant-frequency, peak current-mode control architecture with slope compensation, enabling precise current limiting and stable loop response across wide input/output ranges. Its error amplifier (1.8mS transconductance) drives the ITH node to set peak inductor current, while VFB regulation targets either 0.8V internal reference or externally tracked voltage via SS pin.
It integrates a dedicated gate bias LDO (VIN–VCAP) regulated to 8.0V (typ), delivering strong pull-up (2Ω) and pull-down (0.9Ω) drive for high-side P-MOSFETs. Safety logic includes UVLO (3.25V rising), overvoltage lockout (10% VFB trip), frequency foldback below 0.4V VFB, and verified FMEA compliance for adjacent-pin open/short faults.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5V to 60V - supports cold-crank automotive (≥4.5V) and industrial 24/48V rails without pre-regulation. |
| Output Voltage Range | 0.8V to VIN - enables 100% duty cycle dropout operation for battery-backed or low-VIN scenarios. |
| Quiescent Current | 40µA in Burst Mode - sustains >100-hour standby in always-on automotive modules. |
| Switching Frequency | 50kHz to 850kHz (resistor-programmable) - balances EMI, efficiency, and inductor size across applications. |
| Current Sense Threshold | 95mV (typ) - sets accurate peak current limit independent of temperature or supply variation. |
| PGOOD Accuracy | ±10% window around 0.8V VFB with 100µs delay - ensures reliable system power sequencing and fault reporting. |
| Thermal Package | 12-lead 4mm × 3mm DFN with exposed PGND pad (θJC = 5.5°C/W) - enables >2A continuous output with minimal board area. |
Pinout & Package
Package: 12-lead (4mm × 3mm) plastic DFN with exposed PGND pad (Pin 13), rated for –40°C to +125°C operating junction temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 PLLIN/MODE | External clock input / Burst Mode enable | Floating enables 40µA Burst Mode; grounded selects pulse-skipping; external 75–750kHz clock synchronizes GATE edge. |
| 2 FREQ | Frequency set point | 20µA current source into RFREQ sets 50–850kHz; ground = 350kHz, open = 535kHz. |
| 3 SGND | Signal ground reference | Reference for VFB, ITH, SS, FREQ; must connect to PGND at single-point star ground to avoid noise coupling. |
| 4 SS | Soft-start/tracking input | Internal 10µA pull-up charges CSS for linear VOUT ramp; external divider enables output tracking of another rail. |
| 5 VFB | Feedback voltage sense | Regulates to 0.8V (±1%) reference; <0.4V triggers frequency foldback to limit inrush/short-circuit current. |
| 6 ITH | Error amplifier output / current threshold | 0–2.9V voltage sets peak inductor current; connects to compensation network (RITH/CITH1). |
| 7 PGOOD | Open-drain power-good indicator | Pulls low when VFB outside ±10% of 0.8V or RUN = low; 100µs delay prevents false toggling during transients. |
| 8 RUN | Enable/disable control | 1.26V threshold with 150mV hysteresis; internal 0.4µA pull-up allows direct connection to up to 60V supply. |
| 9 CAP | GATE driver bias supply return | Requires ≥0.47µF ceramic cap to VIN; forms LDO filter for stable 8V gate bias (VIN–VCAP). |
| 10 SENSE | Current sense input | Kelvin-connected to RSENSE; 95mV threshold yields precise current limit with minimal PCB layout sensitivity. |
| 11 VIN | Main power supply input | Supplies internal circuitry and gate driver LDO; requires ≥0.1µF local ceramic bypass to PGND. |
| 12 GATE | P-MOSFET gate driver output | Strong 2Ω pull-up / 0.9Ω pull-down drives high-side switch; disabled if VIN–VCAP < 3.25V (UVLO). |
| 13 PGND | Power ground (exposed pad) | Mandatory solder connection to PCB ground plane for thermal conduction (θJC = 5.5°C/W) and low-impedance return path. |
Key Features
| Feature | Design Value |
|---|---|
| 100% duty cycle operation | Enables seamless transition to dropout mode when VIN drops below VOUT - critical for automotive stop-start and battery backup systems. |
| FMEA-verified fault tolerance | Guaranteed safe behavior under adjacent-pin short/open faults - meets ASIL-B functional safety requirements without additional monitoring. |
| Programmable Burst Mode | 40µA IQ extends battery life in always-on telematics modules while maintaining fast wake-up and tight output regulation. |
| Robust gate driver LDO | VIN–VCAP regulated to 8.0V (±0.4V) with 0.2V dropout at 15mA - ensures full enhancement of high-threshold P-MOSFETs across full VIN range. |
| Accurate current limit | 95mV (±8mV) sense threshold with <±1% tempco - eliminates need for calibration and supports consistent short-circuit protection across temperature. |
| Phase-lockable frequency | Synchronizes to external 75–750kHz clock with <10ns jitter - enables multi-rail EMI reduction and deterministic timing in distributed power systems. |
Applications
| Automotive Infotainment Power | Industrial 24V-to-5V Conversion |
|---|---|
Use Scenario: Powering DSPs, displays, and USB hubs in head units with cold-crank (4.5V) and load-dump (60V) transients. IC Role / Device Role / Timing Role: High-voltage step-down controller managing P-MOSFET switch, feedback regulation, and PGOOD sequencing. Use Value: 100% duty cycle maintains 5V output during cranking; 60V rating survives load dump; 40µA Burst Mode extends parking-mode runtime. |
Use Scenario: Converting factory 24V DC to 3.3V/5V for PLC I/O modules operating in harsh ambient temperatures. IC Role / Device Role / Timing Role: Primary DC/DC controller providing isolated, regulated low-voltage rails with thermal robustness. Use Value: –40°C to +125°C rating ensures reliability in uncooled enclosures; exposed PGND pad dissipates >1.5W without heatsink. |
| Telecom Remote Radio Unit (RRU) | Distributed Power for Data Acquisition |
Use Scenario: Generating bias voltages for RF amplifiers in outdoor base stations exposed to wide temperature swings and lightning surges. IC Role / Device Role / Timing Role: High-efficiency, synchronized buck controller supporting multi-phase coordination and EMI filtering. Use Value: PLL synchronization reduces conducted emissions; 75–750kHz sync range aligns with system clock tree; 60V input withstands surge events. |
Use Scenario: Powering isolated ADCs, sensors, and microcontrollers in modular test equipment requiring precise, low-noise supplies. IC Role / Device Role / Timing Role: Precision regulator with soft-start and tracking for controlled power-up of mixed-signal subsystems. Use Value: SS pin enables output tracking of master supply; ±10% PGOOD ensures clean reset assertion; low 40µA IQ minimizes self-heating drift. |
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 |
|---|---|---|---|
| LTC3891EMSE#PBF | Includes integrated 5V bias supply and dual MOSFET drivers; higher IQ (65µA); same 60V max VIN. | Eliminates external bias LDO but increases solution size; better suited for dual-output or bias-sensitive designs. | Select LTC3891EMSE#PBF when needing integrated gate drive bias and dual outputs; LTC3864EDE#PBF remains optimal for minimal BOM count and lowest IQ. |
| MP24894GQZ-P | Monolithic 60V buck converter (integrated MOSFETs); fixed 500kHz freq; 55µA IQ; no 100% duty cycle. | Reduces external component count but sacrifices dropout capability and programmability; limited to ≤3A output. | Choose MP24894GQZ-P for space-constrained, cost-sensitive designs where 100% duty cycle and ultra-low IQ are not required. |
Compared with LTC3891EMSE#PBF and MP24894GQZ-P, the LTC3864EDE#PBF delivers unique value in ultra-low-quiescent-current, 100%-duty-cycle, high-voltage controller applications - especially where thermal management in compact DFN packages and FMEA-compliant fault behavior are mandatory.
Availability
LTC3864EDE#PBF is available at Aetrix Electronics and suitable for automotive infotainment, industrial 24V-to-5V conversion, and telecom remote radio unit (RRU) power supplies requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LTC3864EDE#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) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving automotive, industrial, and communications markets.
The LTC3864EDE#PBF belongs to Linear's high-voltage DC/DC controller product line, engineered specifically for robust, low-IQ, wide-input automotive and industrial power conversion where reliability under fault conditions and thermal efficiency in small packages are essential.
FAQ
What is the maximum input voltage rating for the LTC3864EDE#PBF?
The LTC3864EDE#PBF has an absolute maximum input voltage (VIN) rating of 65V, with a recommended operating range of 3.5V to 60V. This makes it suitable for automotive applications subject to load-dump transients up to 60V, as well as industrial 48V systems. Operation beyond 60V risks violating the device's safe operating area and is not guaranteed by specifications.
Does the LTC3864EDE#PBF support 100% duty cycle operation, and how is it implemented?
Yes, the LTC3864EDE#PBF supports true 100% duty cycle operation, allowing VOUT to track VIN down to the dropout limit. This is achieved through its P-channel MOSFET gate driver architecture and internal control logic that disables switching when VFB falls below the regulation threshold, maintaining continuous conduction. The feature is confirmed in both the datasheet description and typical dropout behavior graphs.
What is the purpose of the exposed pad (Pin 13) on the LTC3864EDE#PBF DFN package?
The exposed pad (Pin 13) on the LTC3864EDE#PBF is designated PGND and must be soldered to the PCB ground plane. It serves two critical functions: (1) provides low-thermal-resistance path (θJC = 5.5°C/W) for heat dissipation, and (2) establishes low-inductance, high-current return path for power components. Failure to solder this pad degrades thermal performance and may cause premature thermal shutdown or reliability issues.
How does the LTC3864EDE#PBF achieve 40µA quiescent current, and under what conditions?
The LTC3864EDE#PBF achieves 40µA quiescent current in Burst Mode operation, activated by leaving the PLLIN/MODE pin floating. In this mode, the controller enters sleep state when VFB exceeds the 0.8V reference, disabling most internal circuitry while maintaining regulation via output capacitance. This condition is explicitly specified in the Electrical Characteristics table under "Burst Mode Operation" at no load and 25°C.
Can the LTC3864EDE#PBF be synchronized to an external clock, and what is the supported frequency range?
Yes, the LTC3864EDE#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 enables EMI reduction in multi-rail systems and deterministic timing alignment - a feature validated in the datasheet's "Switching Frequency and Clock Synchronization" section.
LTC3864EDE#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 ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-DFN (4x3)
LTC3864EDE#PBF FAQ
1.How can I place an order for LTC3864EDE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3864EDE#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 LTC3864EDE#PBF reliable?
The price and inventory of LTC3864EDE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3864EDE#PBF is usually 5 days.
3.What payment methods are accepted for LTC3864EDE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3864EDE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3864EDE#PBF?
LTC3864EDE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3864EDE#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 LTC3864EDE#PBF?
For technical support, including LTC3864EDE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3864EDE#PBF requirements.
6.How does Aetrix verify that LTC3864EDE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3864EDE#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 LTC3864EDE#PBF meets industry standards.
7.What is the process for return or replacement of LTC3864EDE#PBF?
All LTC3864EDE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3864EDE#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 LTC3864EDE#PBF part is unused and in its original packaging.
Return procedure for LTC3864EDE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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