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Analog Devices Inc. LTC3864MPDE#TRPBF
- Part No.:
- LTC3864MPDE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 12-WFDFN Exposed Pad
- Datasheet:
-
LTC3864MPDE#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 12DFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,296
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Product details
Overview
LTC3864MPDE#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 programmable 50kHz–850kHz switching frequency - optimized for automotive and industrial power supplies requiring robust fault handling and wide temperature operation.
For engineers reviewing the LTC3864MPDE#TRPBF datasheet, LTC3864MPDE#TRPBF pinout, LTC3864MPDE#TRPBF application, or LTC3864MPDE#TRPBF equivalent, this page delivers verified technical context, package-validated pin functions, real-world application mappings, and two confirmed alternative controllers with documented functional trade-offs - all grounded in the official LTC3864 datasheet (Rev. FA) and Analog Devices product documentation.
Technical Context
The LTC3864MPDE#TRPBF implements a constant-frequency, peak current-mode control architecture with slope compensation, enabling precise regulation and fast transient response. Its error amplifier (1.8mS transconductance) drives the ITH pin to set peak inductor current, while internal UVLO (3.25V typical) and overvoltage lockout (10% VFB trip) ensure safe startup and fault recovery.
It integrates a dedicated gate driver LDO (VIN–VCAP regulated to 8.0V ±0.4V), supports phase-lockable synchronization (75kHz–750kHz), and features frequency foldback (to ~18% of set frequency when VFB < 0.4V) for short-circuit protection - all validated under FMEA for adjacent-pin open/short conditions per automotive-grade requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5V to 60V - supports direct battery connection in 12V/24V/48V automotive and industrial systems without pre-regulation. |
| Output Voltage Range | 0.8V to VIN - enables true dropout operation down to 100% duty cycle for low-VIN backup or cold-crank scenarios. |
| Quiescent Current | 40µA in Burst Mode - sustains >90% efficiency at 1mA load, critical for always-on vehicle modules. |
| Switching Frequency | 50kHz–850kHz (resistor-programmable) - balances EMI, size, and efficiency across 3.3V, 5V, and 12V outputs. |
| Operating Temperature | –55°C to +150°C (MP grade) - qualified for under-hood automotive and harsh industrial environments. |
| Current Limit Accuracy | ±10% (95mV sense threshold) - ensures repeatable overcurrent protection across temperature and process variation. |
| PGOOD Accuracy | ±10% window around 0.8V reference - provides reliable system-level power sequencing and fault detection. |
Pinout & Package
Package: 12-lead (4mm × 3mm) plastic DFN with exposed PGND pad (Pin 13), thermally enhanced for high-power density designs. Exposed pad must be soldered to PCB for optimal thermal performance (θJC = 5.5°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - PLLIN/MODE | External clock input / Burst Mode enable | Floating enables 40µA Burst Mode; grounded selects pulse-skipping; driven by external clock (75–750kHz) enables synchronization. |
| 2 - FREQ | Frequency programming node | 20µA current source sets oscillator frequency via external resistor; ground = 350kHz, open = 535kHz. |
| 3 - SGND | Analog signal ground reference | Must be connected to PGND at single point only - prevents noise coupling into feedback and compensation paths. |
| 4 - SS | Soft-start and tracking input | Internal 10µA pull-up charges external capacitor for controlled ramp; also accepts resistor divider for output voltage tracking. |
| 5 - VFB | Feedback voltage sense | Regulates to 0.800V ±0.009V; ±10% window triggers PGOOD; <0.4V activates frequency foldback. |
| 6 - ITH | Error amplifier output / current threshold | 0–2.9V range sets peak inductor current; connects to compensation network (RITH/CITH1). |
| 7 - PGOOD | Open-drain power-good indicator | Pulled low when VFB outside ±10% 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 between VIN and CAP; forms LDO filter for stable 8V gate drive (VIN–VCAP). |
| 10 - SENSE | Current sense input | Kelvin-connected to RSENSE; 95mV threshold sets peak current limit (ILIM = 95mV/RSENSE). |
| 11 - VIN | Main power supply input | Supplies internal circuitry and gate driver LDO; requires ≥0.1µF local bypass to PGND. |
| 12 - GATE | P-channel MOSFET gate driver output | Strong drive (RUP = 2Ω, RDN = 0.9Ω); disabled if VIN–VCAP < 3.25V (typical) to prevent weak turn-on. |
| 13 - PGND | Power ground (exposed pad) | Primary thermal and electrical return for high-current paths; must be soldered to large copper area on PCB. |
Key Features
| Feature | Design Value |
|---|---|
| 100% Duty Cycle Operation | Enables seamless transition into dropout when VIN drops below VOUT - essential for automotive cold-crank (4.5V) and backup power hold-up. |
| FMEA-Verified Pin Fault Tolerance | Validated for adjacent-pin open/short faults - meets ASIL-B readiness requirements for safety-critical automotive subsystems. |
| Programmable Burst Mode | 40µA IQ reduces no-load power loss in always-on ECUs, telematics, and infotainment modules without compromising start-up behavior. |
| Robust Gate Driver LDO | VIN–VCAP regulated to 8.0V ±0.4V with <0.5V dropout at 15mA - ensures strong P-MOSFET turn-on even at low VIN (e.g., 9V battery). |
| Frequency Foldback Protection | Reduces switching frequency to ~18% of set value when VFB < 0.4V - limits average current during short-circuit without sacrificing peak current limit accuracy. |
| Wide-Temperature MP Grade | –55°C to +150°C operation with full specification guarantee - supports engine control units, transmission modules, and industrial motor drives. |
Applications
| Automotive Engine Control Unit (ECU) | Industrial PLC Power Supply |
|---|---|
Use Scenario: Regulating 5V/2A from 6V–16V battery rail in engine bay, surviving 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 100% duty cycle during cranking and foldback during short-circuit. Use Value: Eliminates need for external pre-regulator; maintains microcontroller operation down to 4.5V with <40µA standby draw. |
Use Scenario: Generating isolated 3.3V/1.5A for CPU and I/O from 24V DC bus in factory automation cabinet. IC Role / Device Role / Timing Role: Primary controller in non-isolated buck stage feeding downstream isolated DC/DC; synchronized to system clock via PLLIN/MODE. Use Value: Enables EMI-controlled 350kHz fixed-frequency operation with tight output regulation (±1%) across –40°C to +85°C ambient. |
| Telecom Remote Radio Head (RRH) | Distributed Power Architecture (DPA) |
Use Scenario: Converting 48V backplane to 12V intermediate bus in outdoor base station equipment operating at –40°C to +70°C. IC Role / Device Role / Timing Role: High-efficiency intermediate bus converter with programmable soft-start to prevent inrush into downstream POL converters. Use Value: Delivers >94% efficiency at full load and >88% at 10% load using Burst Mode - extends thermal margin in sealed enclosures. |
Use Scenario: Local 5V/3A regulation from 12V intermediate bus in server blade with strict ripple (<20mVpp) and transient (<50µs recovery) requirements. IC Role / Device Role / Timing Role: Fast-response current-mode controller with slope compensation and external compensation (ITH pin) for custom loop tuning. Use Value: Achieves <1% load regulation and <50µs load-step recovery using 22µH inductor and 2×220µF output capacitance. |
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#TRPBF | Wider VIN (4V–60V), integrated 5V/25mA bias supply, dual-output capability, but higher IQ (65µA in Burst Mode). | Preferred for multi-rail systems needing auxiliary bias; less suitable where minimal footprint and lowest IQ are mandatory. | Select when auxiliary 5V rail is required and board space permits larger MSOP package. |
| LM5116MH/NOPB | Lower max VIN (100V), N-channel MOSFET driver, no 100% duty cycle, higher IQ (100µA), but wider temp range (–40°C to +125°C standard). | Suitable for higher-input industrial supplies (e.g., 72V DC bus); not viable for automotive cold-crank due to lack of dropout mode. | Choose for cost-sensitive 100V-input designs where P-MOSFET simplicity and 100% duty cycle are not required. |
Compared with LTC3864MPDE#TRPBF, LTC3891EMSE#TRPBF adds integrated bias and dual outputs at the cost of higher quiescent current and larger package, while LM5116MH/NOPB supports higher input voltage but lacks 100% duty cycle and automotive-grade MP temperature rating - making LTC3864MPDE#TRPBF uniquely suited for compact, ultra-low-IQ, cold-crank-capable automotive buck controllers.
Availability
LTC3864MPDE#TRPBF is available at Aetrix Electronics and suitable for automotive engine control units, industrial PLC power supplies, and telecom remote radio heads requiring stable component supply across extended temperature and long lifecycle commitments.
Supply support for LTC3864MPDE#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 LTC3864 belongs to Linear's high-reliability power controller family, designed specifically for demanding automotive and industrial DC/DC conversion where wide VIN, ultra-low IQ, fault resilience, and extended temperature operation are mandatory.
FAQ
What is the maximum input voltage rating for the LTC3864MPDE#TRPBF?
The LTC3864MPDE#TRPBF has an absolute maximum input voltage (VIN) rating of 65V, with continuous operation specified from 3.5V to 60V. This 60V upper limit ensures reliable operation across automotive load-dump events and industrial 48V DC bus transients without derating. The device incorporates internal clamping and UVLO hysteresis to maintain stability during fast voltage excursions.
Does the LTC3864MPDE#TRPBF support 100% duty cycle operation, and how is it implemented?
Yes, the LTC3864MPDE#TRPBF supports true 100% duty cycle operation to maintain regulation when VIN falls below the programmed VOUT - critical for automotive cold-crank. It achieves this by disabling the internal oscillator and holding the GATE output high when the error amplifier commands maximum on-time, allowing the P-channel MOSFET to remain fully enhanced without switching losses.
What is the purpose of the CAP pin on the LTC3864MPDE#TRPBF, and what capacitor value is required?
The CAP pin on the LTC3864MPDE#TRPBF serves as the return for the internal gate driver LDO, which regulates VIN–VCAP to 8.0V. A minimum 0.47µF low-ESR ceramic capacitor must be placed between VIN and CAP to stabilize the LDO and supply peak gate charge current. Larger values (e.g., 1µF–10µF) improve noise immunity but do not alter regulation accuracy.
How does the frequency foldback feature work in the LTC3864MPDE#TRPBF during overload?
In the LTC3864MPDE#TRPBF, frequency foldback activates when VFB drops below 0.4V (50% of 0.8V reference), reducing switching frequency linearly down to ~18% of the programmed value. This limits average inductor current during short-circuit or severe overload while preserving peak current limit integrity - preventing thermal runaway without requiring external current limiting components.
What is the guaranteed operating temperature range for the LTC3864MPDE#TRPBF, and how is it validated?
The LTC3864MPDE#TRPBF is guaranteed and tested over the full –55°C to +150°C junction temperature range (MP grade). Unlike commercial or industrial grades, this qualification includes full electrical testing across temperature extremes, not just design correlation - ensuring parameter compliance in under-hood automotive and high-ambient industrial applications without derating.
LTC3864MPDE#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:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-DFN (4x3)
LTC3864MPDE#TRPBF FAQ
1.How can I place an order for LTC3864MPDE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3864MPDE#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 LTC3864MPDE#TRPBF reliable?
The price and inventory of LTC3864MPDE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3864MPDE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3864MPDE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3864MPDE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3864MPDE#TRPBF?
LTC3864MPDE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3864MPDE#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 LTC3864MPDE#TRPBF?
For technical support, including LTC3864MPDE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3864MPDE#TRPBF requirements.
6.How does Aetrix verify that LTC3864MPDE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3864MPDE#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 LTC3864MPDE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3864MPDE#TRPBF?
All LTC3864MPDE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3864MPDE#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 LTC3864MPDE#TRPBF part is unused and in its original packaging.
Return procedure for LTC3864MPDE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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