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Analog Devices Inc. LTC3864IDE#TRPBF
- Part No.:
- LTC3864IDE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 12-WFDFN Exposed Pad
- Datasheet:
-
LTC3864IDE#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 12DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,806
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Product details
Overview
LTC3864IDE#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 - ideal for automotive infotainment power rails and industrial 24V/48V distributed supplies.
For engineers reviewing the LTC3864IDE#TRPBF datasheet, LTC3864IDE#TRPBF pinout, LTC3864IDE#TRPBF application, or LTC3864IDE#TRPBF equivalent, this page delivers verified technical context, package-specific pin functions, real-world application constraints, and validated alternative options - all grounded in the official LTC3864 datasheet (Rev. FA) and Analog Devices product documentation.
Technical Context
The LTC3864IDE#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 error amplifier (1.8mS transconductance) drives the ITH node to set peak inductor current, while the internal 8V gate bias LDO (VIN–VCAP) ensures robust P-MOSFET drive even at low input voltages.
It integrates FMEA-verified fault tolerance for adjacent-pin opens/shorts, programmable frequency foldback (18% of setpoint) during overcurrent, ±10% PGOOD monitoring with 100µs delay, and dual light-load modes: 40µA Burst Mode (PLLIN/MODE floating) or pulse-skipping (PLLIN/MODE grounded). The 12-lead 4mm×3mm DFN package features exposed PGND pad for thermal management.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5V to 60V - supports direct connection to automotive battery (cold-crank down to 3.5V) and industrial 48V systems without pre-regulation. |
| Output Voltage Range | 0.8V to VIN - enables 100% duty cycle operation for ultra-low dropout (e.g., 5V out from 5.2V input), critical for post-regulator applications. |
| Quiescent Current | 40µA in Burst Mode - sustains >90% efficiency at 1mA load, extending battery life in always-on automotive modules. |
| Switching Frequency | 50kHz to 850kHz (resistor-programmable) - allows optimization of size (high-freq) vs. EMI/efficiency (low-freq) in space-constrained designs. |
| Current Limit Accuracy | ±10% over temperature - ensures repeatable short-circuit protection across –40°C to 125°C junction range without calibration. |
| Gate Driver Strength | RUP = 2Ω / RDN = 0.9Ω - delivers fast turn-on/turn-off of high-side P-MOSFETs up to 100ns propagation delay, minimizing switching losses. |
| PGOOD Threshold | ±10% of 0.8V reference - provides reliable system-level power sequencing and fault detection with 100µs debounce. |
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. Exposed pad must be soldered to PCB for thermal performance (θJA = 43°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PGND (Pin 13) | Power Ground Reference | Exposed thermal pad; must be soldered to PCB ground plane for electrical continuity and thermal dissipation - not optional. |
| GATE (Pin 12) | P-Channel MOSFET Gate Driver Output | Drives external high-side switch; includes strong pull-up (2Ω) and pull-down (0.9Ω) for fast edge rates and low shoot-through risk. |
| VIN (Pin 11) | Main Power Supply Input | Accepts 3.5V–60V; requires ≥0.1µF ceramic bypass capacitor placed adjacent to pin for noise immunity and UVLO stability. |
| SENSE (Pin 10) | Current Sense Differential Input | Kelvin-connected to sense resistor (RSENSE); sets peak current limit as 95mV/RSENSE - accuracy depends on layout symmetry. |
| CAP (Pin 9) | Gate Bias LDO Input | Requires ≥0.47µF low-ESR ceramic cap between VIN and CAP; forms local energy reservoir for 8V gate drive supply (VIN–VCAP). |
| RUN (Pin 8) | Enable/Shutdown Control | Logic-compatible input (1.26V threshold); internal 0.4µA pull-up allows direct connection to 60V supply - no external resistor needed. |
| PGOOD (Pin 7) | Open-Drain Power Good Indicator | Asserts low when VFB deviates >±10% from 0.8V or RUN is low; 100µs delay prevents false triggering during transients. |
| ITH (Pin 6) | Error Amplifier Output & Compensation Node | 0–2.9V analog control voltage; connects to RC network for loop compensation - directly sets peak inductor current threshold. |
| VFB (Pin 5) | Feedback Voltage Input | Regulates to 0.8V nominal; senses output via resistor divider; triggers frequency foldback if <0.4V (indicating overload or short). |
| SS (Pin 4) | Soft-Start / Tracking Input | Internal 10µA pull-up charges external capacitor for controlled ramp; also accepts external voltage for output tracking during startup. |
| FREQ (Pin 2) | Frequency Set Point | 20µA current source develops voltage across external resistor; grounding = 350kHz, floating = 535kHz, resistor = 50–850kHz programmable range. |
| PLLIN/MODE (Pin 1) | External Clock Input / Light-Load Mode Select | Floating = 40µA Burst Mode; grounded = pulse-skipping; driven by external clock = phase-lockable sync (75–750kHz). |
Key Features
| Feature | Design Value |
|---|---|
| 100% Duty Cycle Operation | Enables true dropout regulation down to VIN – VDS(ON), eliminating need for LDO post-regulators in battery-powered systems. |
| FMEA-Verified Pin Fault Tolerance | Guaranteed safe operation under adjacent-pin open/short conditions - meets ASIL-B requirements for automotive power controllers. |
| Programmable Frequency Foldback | Reduces switching frequency to ~18% of setpoint during overload, limiting peak inductor current and thermal stress without external circuitry. |
| Integrated 8V Gate Bias LDO | Delivers stable gate drive for P-MOSFETs independent of input voltage (down to 5V), ensuring consistent RDS(ON) and efficiency across wide VIN range. |
| Selective Light-Load Modes | Burst Mode (40µA IQ) maximizes efficiency at microamp loads; pulse-skipping reduces audible noise and output ripple in sensitive analog subsystems. |
| Robust Protection Suite | Includes overvoltage lockout (10% VFB trip), overcurrent with foldback, short-circuit recovery, and UVLO with hysteresis - no external protection IC required. |
Applications
| Automotive Infotainment Power | Industrial 24V/48V DC-DC Conversion |
|---|---|
Use Scenario: Powering DSPs, displays, and audio codecs in vehicle head units where input voltage varies from 5.5V (start-stop) to 42V (load dump). IC Role / Device Role / Timing Role: High-voltage step-down controller regulating 5V/3.3V rails from battery; manages 100% duty cycle during cold-crank events. Use Value: Eliminates need for pre-regulator + LDO cascade, reducing BOM count and improving efficiency at 10mA–2A loads. |
Use Scenario: Generating isolated 5V/12V auxiliary supplies in PLCs and motor drives powered from 24V or 48V industrial buses. IC Role / Device Role / Timing Role: Primary controller for non-isolated buck stage; synchronizes to system clock (via PLLIN/MODE) to minimize EMI coupling. Use Value: Enables compact, thermally efficient design using standard P-MOSFETs - avoids cost and complexity of integrated high-side drivers. |
| Telecom Intermediate Bus Converter | Distributed Power Architecture (DPA) |
Use Scenario: Converting –48V telecom rectified bus to +5V intermediate rail feeding multiple point-of-load converters. IC Role / Device Role / Timing Role: High-input-voltage buck controller with programmable frequency (350kHz typical) to balance efficiency and magnetics size. Use Value: Supports wide input range without derating; 40µA Burst Mode extends standby time during low-traffic periods. |
Use Scenario: Local regulation of 3.3V/1.2V rails from 12V backplane in server and networking equipment. IC Role / Device Role / Timing Role: Asynchronous buck controller driving discrete P-MOSFETs; uses SS pin for output voltage tracking during hot-swap insertion. Use Value: Ensures seamless power-up sequencing across multiple rails; exposed PGND pad simplifies thermal design in dense board layouts. |
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 input, 3.5µA shutdown IQ, but requires external bootstrap capacitor for N-MOSFET drive; no 100% duty cycle. | Better suited for dual-rail systems (e.g., ±12V) but lacks dropout capability for low-VIN scenarios. | Choose LTC3892 for multi-output designs needing lower shutdown IQ; retain LTC3864IDE#TRPBF when 100% duty cycle or P-MOSFET simplicity is mandatory. |
| MP24894GQKT-Z | 60V monolithic buck converter (integrated MOSFETs), 300µA IQ, fixed 340kHz frequency, no frequency sync or Burst Mode. | Lower BOM count for ≤3A applications, but limited to fixed frequency and no programmable light-load behavior. | Choose MP24894 for cost-sensitive, low-complexity 3A designs; select LTC3864IDE#TRPBF when design flexibility (frequency, mode, external FET selection) outweighs integration. |
Compared with LTC3892EMSE#TRPBF and MP24894GQKT-Z, the LTC3864IDE#TRPBF uniquely combines 100% duty cycle, 40µA Burst Mode, and P-MOSFET drive in a thermally optimized DFN - making it the only option for high-reliability, ultra-low-IQ, dropout-critical automotive and industrial controllers.
Availability
LTC3864IDE#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment power supplies, industrial 24V/48V DC-DC conversion, and telecom intermediate bus applications requiring stable component supply, long-term lifecycle support, and guaranteed –40°C to 125°C operation.
Supply support for LTC3864IDE#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 (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 with precision, reliability, and innovation.
The LTC3864IDE#TRPBF belongs to the LTC® high-voltage DC/DC controller family, designed specifically for robust, high-efficiency power conversion in harsh environments - emphasizing FMEA validation, wide VIN/VOUT range, and ultra-low quiescent current for always-on systems.
FAQ
What is the maximum input voltage rating for the LTC3864IDE#TRPBF?
The LTC3864IDE#TRPBF has an absolute maximum input supply voltage (VIN) of 65V, with a recommended operating range of 3.5V to 60V. This rating is confirmed in the Absolute Maximum Ratings table (page 2 of the datasheet) and applies to both continuous operation and transient conditions such as automotive load dump. Exceeding 65V may cause permanent damage.
Does the LTC3864IDE#TRPBF support 100% duty cycle operation, and how is it implemented?
Yes, the LTC3864IDE#TRPBF supports true 100% duty cycle operation, enabling regulation even when VIN drops below the programmed VOUT. This is achieved through its P-channel MOSFET gate driver architecture and internal control logic that maintains GATE high during dropout - explicitly documented in the "Very Low Dropout Operation" feature list and Figure G06 (Dropout Behavior) of the datasheet.
What is the purpose of the CAP pin on the LTC3864IDE#TRPBF, and what capacitor value is required?
The CAP pin on the LTC3864IDE#TRPBF serves as the input to the internal 8V gate bias LDO (VIN–VCAP). A minimum 0.47µF low-ESR ceramic capacitor must be placed between VIN and CAP to stabilize the LDO and supply peak gate drive current. This requirement is specified in the Pin Functions section (page 8) and Functional Diagram (page 9), and failure to meet it risks gate drive instability and MOSFET switching failure.
How does the LTC3864IDE#TRPBF achieve 40µA quiescent current, and under what conditions?
The LTC3864IDE#TRPBF achieves 40µA quiescent current exclusively in Burst Mode operation, which is enabled by leaving the PLLIN/MODE pin floating. This mode disables most internal circuitry while maintaining feedback monitoring, allowing the output capacitor to supply light loads. The 40µA value is measured at VFB = 0.83V, no load, and is specified in the Electrical Characteristics table (page 3) under "Burst Mode Operation".
Can the LTC3864IDE#TRPBF be synchronized to an external clock, and what is the supported frequency range?
Yes, the LTC3864IDE#TRPBF 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 detailed in the "Phase-Lockable Frequency" feature list and the Electrical Characteristics table (page 3), and enables EMI reduction in multi-converter systems.
LTC3864IDE#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 ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-DFN (4x3)
LTC3864IDE#TRPBF FAQ
1.How can I place an order for LTC3864IDE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3864IDE#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 LTC3864IDE#TRPBF reliable?
The price and inventory of LTC3864IDE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3864IDE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3864IDE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3864IDE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3864IDE#TRPBF?
LTC3864IDE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3864IDE#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 LTC3864IDE#TRPBF?
For technical support, including LTC3864IDE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3864IDE#TRPBF requirements.
6.How does Aetrix verify that LTC3864IDE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3864IDE#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 LTC3864IDE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3864IDE#TRPBF?
All LTC3864IDE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3864IDE#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 LTC3864IDE#TRPBF part is unused and in its original packaging.
Return procedure for LTC3864IDE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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