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Analog Devices Inc. LTC3864IDE#PBF
- Part No.:
- LTC3864IDE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 12-WFDFN Exposed Pad
- Datasheet:
-
LTC3864IDE#PBF.pdf
- Description:
- IC REG CTRLR BUCK 12DFN
- Quantity:
- Payment:
- Shipping:
Inventory:424
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Product details
Overview
LTC3864IDE#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 quiescent current in Burst Mode, and programmable switching frequency from 50kHz to 850kHz. It is used in automotive power supplies where wide VIN range and dropout resilience are critical.
For engineers reviewing the LTC3864IDE#PBF datasheet, LTC3864IDE#PBF pinout, LTC3864IDE#PBF application, or LTC3864IDE#PBF equivalent, this page delivers verified technical context, package-specific pin functions, real-world application mappings, and two validated alternative controllers - all grounded in the official LTC3864 datasheet (Rev. FA) and Analog Devices product documentation.
Technical Context
The LTC3864IDE#PBF 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 protection (±10% VFB window) ensure robust fault handling.
It features dual light-load modes: Burst Mode (40µA IQ, enabled by floating PLLIN/MODE) and pulse-skipping (enabled by grounding PLLIN/MODE), plus phase-lockable synchronization (75–750kHz) and programmable soft-start or output tracking via the SS pin. The GATE driver delivers strong pull-up (2Ω) and pull-down (0.9Ω) capability for efficient P-MOSFET switching.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5V to 60V - supports cold-crank (≥3.5V) and load-dump (≤60V) conditions in automotive systems. |
| Output Voltage Range | 0.8V to VIN - enables 100% duty cycle dropout operation, critical for low-VIN battery backup scenarios. |
| Quiescent Current | 40µA in Burst Mode - sustains >100-hour standby in always-on vehicle modules without draining battery. |
| Switching Frequency | 50kHz–850kHz (resistor-programmable); 75kHz–750kHz (PLL-synchronizable) - balances EMI control and inductor size. |
| Current Limit Threshold | 95mV across RSENSE - provides accurate, temperature-stable peak current limiting independent of VIN. |
| Power Good Accuracy | ±10% VFB window with 100µs delay - ensures reliable system enable/disable sequencing in multi-rail power trees. |
| Shutdown Current | 7µA - enables ultra-low-power disable state for safety-critical shutdown paths. |
Pinout & Package
The LTC3864IDE#PBF is housed in a thermally enhanced 12-lead (4mm × 3mm) plastic DFN package with exposed PGND pad (Pin 13) requiring PCB soldering for optimal thermal performance (θJC = 5.5°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PGND (Pin 13) | Power Ground Reference | Exposed thermal pad; must be soldered to PCB ground plane to meet θJA = 43°C/W and prevent thermal shutdown. |
| GATE (Pin 12) | P-Channel MOSFET Gate Driver Output | Drives external high-side P-MOSFET with 2Ω pull-up / 0.9Ω pull-down; supports gate bias up to 8V below VIN. |
| VIN (Pin 11) | Main Power Supply Input | Supplies internal circuitry and gate driver LDO; requires ≥0.1µF ceramic bypass to PGND near pin. |
| SENSE (Pin 10) | Current Sense Differential Input | Kelvin-connected to RSENSE between VIN and SENSE; sets 95mV current limit threshold with <±3% temp drift. |
| CAP (Pin 9) | Gate Driver Bias Supply Return | Forms VIN–CAP LDO output (8V regulated); requires ≥0.47µF low-ESR ceramic capacitor adjacent to VIN/CAP pins. |
| RUN (Pin 8) | Enable/Shutdown Control Input | 1.26V enable threshold with 150mV hysteresis; internal 0.4µA pull-up allows direct connection to 60V supply. |
| PGOOD (Pin 7) | Open-Drain Power Good Output | Asserts low when VFB deviates >±10% from 0.8V reference; includes 100µs delay to suppress false triggers during transients. |
| ITH (Pin 6) | Error Amplifier Output & Compensation Node | 0–2.9V range; connects to RC network for loop stability; voltage directly sets peak inductor current setpoint. |
| VFB (Pin 5) | Feedback Voltage Input | Regulated to 0.800V ±1%; 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 voltage for supply tracking. |
| FREQ (Pin 2) | Frequency Set Point Input | 20µA current source develops voltage across RFREQ; sets 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 external clock = PLL sync (75–750kHz). |
Key Features
| Feature | Design Value |
|---|---|
| 100% Duty Cycle Operation | Enables seamless transition into dropout when VIN drops below VOUT - essential for automotive cold-crank survival. |
| FMEA-Verified Pin Fault Tolerance | Validated for adjacent pin open/short failure modes - meets ASIL-B functional safety requirements for automotive ECUs. |
| Programmable Frequency Foldback | Reduces switching frequency to ~18% of setpoint when VFB < 0.4V - limits inductor current during short-circuit or startup overload. |
| Strong Gate Drive with Low Dropout | 2Ω pull-up / 0.9Ω pull-down + 8V gate bias LDO - ensures fast, low-loss turn-on/turn-off of high-threshold P-MOSFETs. |
| Accurate ±10% PGOOD Monitoring | Guarantees reliable power sequencing in multi-rail systems - avoids processor brownout or FPGA configuration failure. |
Applications
| Automotive Infotainment Power | Industrial PLC I/O Module |
|---|---|
|
Use Scenario: Powering 5V/2A display and audio subsystems in head units during engine start-stop cycles with VIN dipping to 3.5V. IC Role / Device Role / Timing Role: High-voltage step-down controller maintaining regulated 5V output despite 3.5V–16V input transients. Use Value: 100% duty cycle prevents output collapse during cold-crank; 40µA Burst Mode extends battery life in parked mode. |
Use Scenario: Generating isolated 3.3V logic rails from 24V industrial bus in programmable logic controllers. IC Role / Device Role / Timing Role: Primary DC/DC controller regulating output with ±1% line/load regulation over –40°C to 125°C. Use Value: FMEA-verified pin fault tolerance ensures continued operation under harsh ESD or wiring fault conditions. |
| Telecom Remote Radio Unit | Distributed Power System |
|
Use Scenario: Converting 48V telecom supply to 12V intermediate bus in outdoor base station radios exposed to wide temperature swings. IC Role / Device Role / Timing Role: Constant-frequency PWM controller synchronized to system clock (75–750kHz) to minimize EMI coupling. Use Value: PLL synchronization eliminates beat frequencies; 60V max VIN withstands lightning-induced surges on long cable runs. |
Use Scenario: Local point-of-load conversion in server backplanes where multiple 12V-to-5V regulators feed ASICs and memory. IC Role / Device Role / Timing Role: Asynchronous buck controller with programmable soft-start to prevent inrush current cascading across rails. Use Value: SS pin tracking enables coordinated startup with upstream 12V rail; PGOOD signals enable firmware-controlled power sequencing. |
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#PBF | Dual-output, 60V input, 3.5µA shutdown IQ, no 100% duty cycle; requires external bootstrap for N-MOSFET. | Better for dual-rail systems (e.g., ±12V analog supplies); unsuitable for single-rail dropout-critical designs. | Select when needing dual outputs or lower shutdown IQ; avoid if 100% duty cycle or P-MOSFET simplicity is required. |
| MPQ4332GJ-AEC1-P | Monolithic 60V/3A buck converter (integrated MOSFETs), 25µA IQ, fixed 2.2MHz fSW, AEC-Q100 Grade 1. | Higher integration reduces BOM count but sacrifices 100% duty cycle and adjustable frequency; limited to ≤3A. | Select for space-constrained automotive modules where full integration outweighs flexibility; verify thermal derating at 60V. |
Compared with LTC3864IDE#PBF, LTC3892EMSE#PBF offers dual-channel control but lacks dropout capability, while MPQ4332GJ-AEC1-P trades configurability for compactness and AEC-Q100 qualification - making LTC3864IDE#PBF the optimal choice for high-reliability, single-output, 100% duty cycle applications.
Availability
LTC3864IDE#PBF is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial PLC power modules, and telecom remote radio units requiring stable component supply across extended temperature ranges (–40°C to 125°C).
Supply support for LTC3864IDE#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 ICs, serving automotive, industrial, and communications markets with precision, reliability, and longevity.
The LTC3864IDE#PBF belongs to the LTC® high-voltage DC/DC controller family, designed specifically for ruggedized power conversion in automotive and industrial environments where wide input range, fault resilience, and low IQ are mandatory.
FAQ
What is the operating temperature range for the LTC3864IDE#PBF?
The LTC3864IDE#PBF is rated for –40°C to +125°C junction temperature. This grade ('I' suffix) is qualified for automotive under-hood and industrial control applications where ambient temperatures exceed standard commercial ranges. Its thermal design - including the exposed PGND pad - ensures reliable operation within this range when PCB layout follows recommended copper pour and via guidelines.
Does the LTC3864IDE#PBF support 100% duty cycle operation, and how is it implemented?
Yes, the LTC3864IDE#PBF supports true 100% duty cycle operation. When VIN drops below the programmed VOUT, the controller maintains regulation by holding the external P-channel MOSFET fully on - eliminating the need for a second regulator or LDO post-regulator. This behavior is inherent to its architecture and requires no external components or configuration changes.
How does the LTC3864IDE#PBF achieve low quiescent current, and what is the impact on light-load efficiency?
The LTC3864IDE#PBF achieves 40µA quiescent current in Burst Mode operation - activated by leaving the PLLIN/MODE pin floating. In this mode, the controller cycles between active regulation and deep sleep, minimizing switching losses while sustaining output voltage via output capacitance. This delivers >85% efficiency at 1mA load, critical for always-on automotive modules.
Can the LTC3864IDE#PBF be synchronized to an external clock, and what are the valid frequency and voltage levels?
Yes, the LTC3864IDE#PBF supports PLL-based synchronization via the PLLIN/MODE pin. It locks to external clocks from 75kHz to 750kHz, with logic-high input ≥2V and logic-low ≤0.5V. The internal oscillator's default frequency (set by FREQ pin) must be within ~15% of the external clock for fast lock; once locked, the GATE turn-on edge aligns precisely to the external clock's rising edge.
What protection features are integrated into the LTC3864IDE#PBF, and how do they respond during faults?
The LTC3864IDE#PBF integrates overvoltage protection (VFB > +10% trips immediate GATE shutdown), overcurrent/short-circuit protection (with frequency foldback below 0.4V VFB), and undervoltage lockout (UVLO at 3.25V VIN–VCAP). During a short circuit, it reduces switching frequency to ~18% of setpoint while maintaining peak current limit - limiting power dissipation and enabling safe recovery without latch-off.
LTC3864IDE#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)
LTC3864IDE#PBF FAQ
1.How can I place an order for LTC3864IDE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3864IDE#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 LTC3864IDE#PBF reliable?
The price and inventory of LTC3864IDE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3864IDE#PBF is usually 5 days.
3.What payment methods are accepted for LTC3864IDE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3864IDE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3864IDE#PBF?
LTC3864IDE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3864IDE#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 LTC3864IDE#PBF?
For technical support, including LTC3864IDE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3864IDE#PBF requirements.
6.How does Aetrix verify that LTC3864IDE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3864IDE#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 LTC3864IDE#PBF meets industry standards.
7.What is the process for return or replacement of LTC3864IDE#PBF?
All LTC3864IDE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3864IDE#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 LTC3864IDE#PBF part is unused and in its original packaging.
Return procedure for LTC3864IDE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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