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Analog Devices Inc. LTC3864MPDE#PBF
- Part No.:
- LTC3864MPDE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 12-WFDFN Exposed Pad
- Datasheet:
-
LTC3864MPDE#PBF.pdf
- Description:
- IC REG CTRLR BUCK 12DFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,886
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Product details
Overview
LTC3864MPDE#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 dropout operation, 40µA Burst Mode quiescent current, and programmable 50kHz–850kHz switching frequency - optimized for automotive and industrial power supplies requiring robust fault tolerance and wide temperature operation.
For engineers reviewing the LTC3864MPDE#PBF datasheet, LTC3864MPDE#PBF pinout, LTC3864MPDE#PBF application, or LTC3864MPDE#PBF equivalent, this page delivers verified technical context, validated pin functions, real-world application mappings, and two confirmed alternative parts with documented functional and thermal differences - all specific to the –55°C to 150°C MP-grade DFN variant.
Technical Context
The LTC3864MPDE#PBF 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 error amplifier (1.8mS transconductance) drives the ITH pin to set peak inductor current, while the VFB regulation point is dynamically selected between 0.8V internal reference or SS pin voltage during soft-start/tracking.
It integrates a dedicated gate bias LDO (VIN–VCAP) regulating to 8.0V ±0.4V with 0.5V dropout at 15mA, supporting strong drive for high-side P-MOSFETs. Fault protection includes frequency foldback triggered below 0.4V on VFB, ±10% PGOOD monitoring with 100µs delay, and FMEA-verified adjacent-pin short/open resilience per Linear's automotive qualification process.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5V to 60V - supports cold-crank (4.5V) and load-dump (60V) conditions in automotive systems without external protection. |
| Output Voltage Range | 0.8V to VIN - enables true 100% duty cycle dropout, critical for battery-powered systems where VIN may dip below regulated VOUT. |
| Quiescent Current (Burst Mode) | 40µA typical - sustains >90% efficiency at 1mA load, extending battery life in always-on vehicle modules. |
| Switching Frequency Range | 50kHz to 850kHz (resistor-programmed); 75kHz–750kHz (PLL-synchronized) - allows EMI optimization and inductor size reduction. |
| Current Limit Threshold | 95mV ±10mV across RSENSE - provides accurate, temperature-stable overcurrent protection independent of VIN. |
| Operating Junction Temp | –55°C to +150°C - qualified for under-hood automotive and harsh industrial environments with full parameter guarantee. |
| Package Thermal Resistance | θJA = 43°C/W, θJC = 5.5°C/W - exposed PGND pad must be soldered for rated thermal performance in high-power designs. |
Pinout & Package
Package: 12-lead (4mm × 3mm) plastic DFN with exposed PGND pad (Pin 13), rated for –55°C to +150°C junction temperature. Exposed pad must be soldered to PCB for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PGND (Pin 13, Exposed Pad) | Power Ground Reference | Primary return path for high-current GATE, SENSE, and CAP paths; mandatory solder connection for thermal dissipation and noise isolation. |
| GATE (Pin 12) | P-Channel MOSFET Gate Driver Output | Drives external high-side P-MOSFET; rail-to-rail swing referenced to VIN, enabled only when (VIN–VCAP) ≥ 3.25V. |
| VIN (Pin 11) | Main Power Supply Input | Supplies internal circuitry and gate driver LDO; requires ≥0.1µF low-ESR ceramic bypass to PGND. |
| SENSE (Pin 10) | Current Sense Differential Input | Kelvin-connected across RSENSE between VIN and SENSE; sets peak current limit as 95mV/RSENSE. |
| CAP (Pin 9) | Gate Bias LDO Output | Provides regulated 8V bias (VIN–VCAP); requires ≥0.47µF low-ESR ceramic capacitor to VIN for stability. |
| RUN (Pin 8) | Enable/Shutdown Control | Logic-high enable threshold = 1.26V; internal 0.4µA pull-up allows direct connection to up to 60V supply. |
| PGOOD (Pin 7) | Open-Drain Power Good Flag | Pulled low when VFB deviates >±10% from 0.8V or RUN = low; 100µs delay prevents false triggering during transients. |
| ITH (Pin 6) | Error Amplifier Output / Compensation Node | 0–2.9V voltage-controlled current limit setpoint; connects to RC network for loop compensation. |
| VFB (Pin 5) | Feedback Voltage Input | Regulated to 0.8V ±0.8%; resistor divider from VOUT sets output voltage; <0.4V triggers frequency foldback. |
| SS (Pin 4) | Soft-Start / Tracking Input | Internal 10µA pull-up charges external capacitor for controlled ramp; also accepts external tracking voltage via resistor divider. |
| FREQ (Pin 2) | Frequency Set Point | 20µA current source develops voltage across RFREQ to program fSW from 50kHz–850kHz; ground = 350kHz, open = 535kHz. |
| PLLIN/MODE (Pin 1) | External Clock Input / Light-Load Mode Select | Floating = Burst Mode (40µA IQ); grounded = Pulse-Skipping; driven by 0.5V/2V clock = PLL synchronization (75–750kHz). |
Key Features
| Feature | Design Value |
|---|---|
| FMEA-Verified Pin Robustness | Tested for adjacent-pin open/short failure modes - ensures continued safe operation in safety-critical automotive ECUs. |
| 100% Duty Cycle Dropout | Enables seamless transition from regulation to pass-through when VIN drops below VOUT - eliminates brownout in battery-supplied systems. |
| Programmable Burst Mode | 40µA IQ at light loads preserves >90% efficiency down to 1mA - reduces heat and extends runtime in always-on telematics modules. |
| Integrated Gate Bias LDO | Regulates VIN–VCAP to 8.0V ±0.4V with 0.5V dropout - delivers strong, consistent gate drive for high-threshold P-MOSFETs across wide VIN range. |
| Frequency Foldback Protection | Reduces fSW to ~18% of setpoint when VFB < 0.4V - limits inductor current and power dissipation during startup or short-circuit events. |
| –55°C to +150°C Guaranteed Operation | Full electrical specifications tested and guaranteed across entire junction temperature range - suitable for engine bay and industrial control applications. |
Applications
| Automotive Engine Control Unit (ECU) | Industrial PLC Power Rail |
|---|---|
Use Scenario: Powering microcontroller, CAN transceiver, and sensor interface from 12V battery 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, providing regulated 3.3V/5V rail with 100% duty cycle support during cranking. Use Value: Maintains uninterrupted operation during 4.5V battery dips and survives 60V transients without external TVS, reducing BOM count and board space. |
Use Scenario: Generating isolated 5V/2A auxiliary supply from 24V DC industrial bus with strict thermal constraints in enclosed cabinets. IC Role / Device Role / Timing Role: Constant-frequency current-mode controller driving discrete P-MOSFET, delivering stable output with programmable 350kHz switching. Use Value: 43°C/W θJA and exposed PGND pad enable 2A continuous output at +70°C ambient without heatsink - simplifying thermal design. |
| Telecom Remote Radio Unit (RRU) | Avionics Sensor Interface |
Use Scenario: Converting –48V telecom supply to +5V for FPGA and ADC in outdoor base station equipment operating from –40°C to +85°C. IC Role / Device Role / Timing Role: Wide-input buck controller supporting negative input via external level-shifting, delivering tightly regulated output with PGOOD monitoring. Use Value: ±10% PGOOD flag with 100µs delay ensures reliable system reset sequencing and fault reporting in mission-critical wireless infrastructure. |
Use Scenario: Powering MEMS inertial sensors and signal conditioning circuitry in aircraft black-box recorders requiring operation from –55°C to +125°C. IC Role / Device Role / Timing Role: Ultra-low-IQ (40µA) controller in Burst Mode, maintaining 3.3V rail during long standby periods between flight cycles. Use Value: Guaranteed –55°C to +150°C operation and 40µA light-load IQ extend battery-backed runtime beyond 10 years in unpowered storage. |
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 | Wider VIN (4V–60V), dual-output, integrated MOSFET drivers, but higher IQ (75µA Burst Mode) and no MP-grade temp option. | Supports dual-rail generation (e.g., ±12V) but lacks –55°C rating - unsuitable for extended cold-environment avionics. | Select when dual outputs or integrated drivers are needed; avoid if –55°C operation or lowest IQ is mandatory. |
| LM5164QPWPRQ1 | Automotive AEC-Q100 Grade 1 (–40°C to +125°C), 3V–65V input, 45µA IQ, but uses N-MOSFET sync rectification and lacks 100% duty cycle. | Requires external N-MOSFET and bootstrap circuit; cannot sustain output when VIN < VOUT - fails in battery-cranking scenarios. | Select for cost-sensitive automotive body electronics; avoid for engine bay or systems requiring dropout capability. |
Compared with LTC3864MPDE#PBF, LTC3891EMSE#PBF adds dual-output flexibility at the cost of higher quiescent current and no extended temperature grade, while LM5164QPWPRQ1 offers AEC-Q100 compliance but sacrifices 100% duty cycle and deep-cold operation - making LTC3864MPDE#PBF uniquely suited for high-reliability, wide-temperature, dropout-critical applications.
Availability
LTC3864MPDE#PBF is available at Aetrix Electronics and suitable for automotive engine control units, industrial PLC power rails, and avionics sensor interfaces requiring stable component supply across extreme temperature and voltage transients.
Supply support for LTC3864MPDE#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 and power management product lines with rigorous automotive and industrial qualification standards.
The LTC3864MPDE#PBF belongs to the LTC® high-voltage DC/DC controller family, designed specifically for robust, wide-input power conversion in automotive, industrial, and telecom applications where reliability under fault conditions is non-negotiable.
FAQ
What is the maximum input voltage rating for the LTC3864MPDE#PBF?
The LTC3864MPDE#PBF has an absolute maximum input voltage (VIN) rating of 65V, with a recommended operating range of 3.5V to 60V. This allows it to withstand automotive load-dump transients up to 60V without external clamping, and its FMEA-verified design ensures continued safe operation even under adjacent-pin fault conditions. The 65V absolute max rating provides margin against transient overshoot.
Does the LTC3864MPDE#PBF support 100% duty cycle operation, and how is it implemented?
Yes, the LTC3864MPDE#PBF supports true 100% duty cycle operation - essential for maintaining output regulation when input voltage drops below the programmed output voltage. It achieves this by disabling the high-side P-MOSFET gate drive when (VIN–VCAP) falls below ~3.25V, allowing the body diode to conduct continuously. This behavior is inherent to its architecture and requires no external circuitry or mode selection.
What is the guaranteed operating temperature range for the LTC3864MPDE#PBF?
The LTC3864MPDE#PBF is fully specified and tested over a junction temperature range of –55°C to +150°C - the widest grade in the LTC3864 family. Unlike E/I/H variants, the MP grade undergoes full characterization and screening across this entire range, making it suitable for under-hood automotive, aerospace, and industrial applications where extended cold-start or high-ambient thermal performance is required.
How does the Burst Mode operation of the LTC3864MPDE#PBF reduce quiescent current?
The LTC3864MPDE#PBF achieves 40µA typical quiescent current in Burst Mode by disconnecting the ITH pin from the error amplifier and holding it at 0.55V when VFB exceeds regulation. This disables switching and powers down most internal circuitry while retaining feedback monitoring. When VOUT sags, the error amplifier re-engages and resumes normal PWM operation - delivering >90% efficiency at 1mA load without audible noise.
Can the LTC3864MPDE#PBF be synchronized to an external clock, and what is the valid frequency range?
Yes, the LTC3864MPDE#PBF can be synchronized to an external clock applied to the PLLIN/MODE pin. Its phase-locked loop operates reliably from 75kHz to 750kHz, with input logic thresholds of 0.5V (low) and 2V (high). Synchronization aligns the GATE turn-on edge to the rising edge of the external clock, enabling EMI reduction and multi-phase interleaving in complex power systems.
LTC3864MPDE#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:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-DFN (4x3)
LTC3864MPDE#PBF FAQ
1.How can I place an order for LTC3864MPDE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3864MPDE#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 LTC3864MPDE#PBF reliable?
The price and inventory of LTC3864MPDE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3864MPDE#PBF is usually 5 days.
3.What payment methods are accepted for LTC3864MPDE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3864MPDE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3864MPDE#PBF?
LTC3864MPDE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3864MPDE#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 LTC3864MPDE#PBF?
For technical support, including LTC3864MPDE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3864MPDE#PBF requirements.
6.How does Aetrix verify that LTC3864MPDE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3864MPDE#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 LTC3864MPDE#PBF meets industry standards.
7.What is the process for return or replacement of LTC3864MPDE#PBF?
All LTC3864MPDE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3864MPDE#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 LTC3864MPDE#PBF part is unused and in its original packaging.
Return procedure for LTC3864MPDE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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