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Analog Devices Inc. LTC3863HDE#PBF
- Part No.:
- LTC3863HDE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 12-WFDFN Exposed Pad
- Datasheet:
-
LTC3863HDE#PBF.pdf
- Description:
- IC REG CTRLR BUCK 12DFN
- Quantity:
- Payment:
- Shipping:
Inventory:120
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Product details
Overview
LTC3863HDE#PBF from Analog Devices is a high-voltage, low-quiescent-current inverting DC/DC PMOS controller for automotive and industrial negative power rails. It drives external P-channel MOSFETs to generate regulated negative outputs from –0.4V to –150V, operates from 3.5V to 60V input, draws only 70µA in Burst Mode, and supports programmable switching frequency from 50kHz to 850kHz - enabling compact, efficient designs for telecom and distributed power systems.
For engineers reviewing the LTC3863HDE#PBF datasheet, LTC3863HDE#PBF pinout, LTC3863HDE#PBF application, or LTC3863HDE#PBF equivalent, key selection considerations include its –40°C to 150°C junction temperature rating, 12-lead 4mm × 3mm DFN package with exposed PGND pad, inverting topology support, peak current mode control, and integrated gate driver with 8V VIN–VCAP bias regulation.
Technical Context
The LTC3863HDE#PBF implements a nonsynchronous, peak current mode, constant-frequency PWM architecture optimized for inverting configurations. Its internal error amplifier (1.8mS transconductance) regulates VFB to 0.800V ±1%, while the VFBN pin enables precise sensing of negative output voltage via an inverting resistor divider network.
It integrates a phase-locked loop (75kHz–750kHz sync range), programmable soft-start/tracking via SS pin (10µA pull-up), and robust fault protection including overvoltage lockout (10% VFB threshold), short-circuit foldback (18% frequency reduction at VFB < 0.4V), and verified adjacent-pin FMEA compliance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5V to 60V - supports wide automotive battery and industrial bus inputs without pre-regulation. |
| Negative Output Range | –0.4V to –150V - enables deep negative rails for op-amp biasing, RF stages, and instrumentation. |
| Quiescent Current | 70µA in Burst Mode - extends battery life in always-on automotive modules and remote sensors. |
| Switching Frequency | 50kHz–850kHz (resistor-programmable) - balances efficiency, size, and EMI for diverse PCB layouts. |
| Junction Temp Range | –40°C to +150°C - qualified for under-hood automotive and high-temp industrial environments. |
| Current Limit Threshold | 95mV (typ.) across RSENSE - provides accurate, temperature-stable peak inductor current limiting. |
| Gate Driver Bias | VIN–VCAP = 8.0V (typ.) - ensures strong turn-on drive for high-side P-MOSFETs up to 60V input. |
Pinout & Package
Package: 12-lead (4mm × 3mm) plastic DFN with exposed PGND pad (Pin 13), thermally enhanced for high-power operation in automotive and industrial applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PGND (Pin 13) | Power Ground Reference | Exposed thermal pad - must be soldered to PCB for thermal performance and low-impedance return path for high-current switching. |
| GATE (Pin 12) | P-Channel MOSFET Gate Driver Output | Drives external high-side P-MOSFET; regulated 8V gate bias (VIN–VCAP) enables fast, robust turn-on. |
| VIN (Pin 11) | Main Power Supply Input | Supplies IC core and gate driver; requires ≥0.1µF ceramic bypass to PGND for stability. |
| SENSE (Pin 10) | Current Sense Input | Kelvin-connected to RSENSE - measures peak inductor current for cycle-by-cycle current limiting. |
| CAP (Pin 9) | Gate Driver Bias Capacitor Terminal | Connects to VIN via ≥0.1µF low-ESR ceramic - forms LDO filter for stable 8V gate bias supply. |
| RUN (Pin 8) | Enable/Shutdown Control | Logic-compatible input (1.26V threshold); pulls up internally to ~3.3V; accepts up to 60V external enable signal. |
| VFBN (Pin 7) | Inverting Feedback Node | Connects center of RFB1/RFB2 divider - enables accurate negative output sensing without level-shifting circuitry. |
| VFB (Pin 5) | Feedback Reference Input | Regulated to 0.800V ±1% - sets output voltage via resistor divider; triggers foldback if <0.4V. |
| ITH (Pin 6) | Error Amplifier Output / Compensation | 0–2.9V control node - sums with slope compensation to set peak current threshold; requires RITH ≥10kΩ. |
| SS (Pin 4) | Soft-Start / Tracking Input | Internal 10µA pull-up charges external capacitor - controls output ramp rate or enables supply tracking. |
| FREQ (Pin 2) | Frequency Setpoint Input | 20µA current source sets oscillator frequency via RFREQ; ground=350kHz, open=535kHz, resistor=50–850kHz. |
| PLLIN/MODE (Pin 1) | Sync Clock Input / Light-Load Mode Select | Floating = Burst Mode (70µA IQ); grounded = Pulse-Skipping; driven = PLL sync (75–750kHz). |
Key Features
| Feature | Design Value |
|---|---|
| High-Voltage Inverting Control | Supports –150V outputs using single inductor and external P-MOSFET - eliminates need for isolated topologies in many negative rail applications. |
| Burst Mode Efficiency | 70µA quiescent current at light load - maintains >85% efficiency down to 1mA output in automotive sleep modes. |
| Robust Fault Protection | Integrated overvoltage lockout (10% VFB), frequency foldback (18% min frequency at short-circuit), and verified adjacent-pin FMEA - reduces system-level safety validation effort. |
| Thermally Enhanced DFN | 4mm × 3mm package with exposed PGND pad (θJC = 5.5°C/W) - sustains 150°C junction temperature in high-power density layouts. |
| Flexible Start-Up Control | Programmable soft-start via SS pin capacitor or external tracking via resistor divider - prevents inrush current and enables coordinated multi-rail sequencing. |
Applications
| Automotive Infotainment Power | Industrial Sensor Signal Conditioning |
|---|---|
|
Use Scenario: Generating –5V and –12V rails for analog front-ends and precision ADCs in vehicle head units and ADAS ECUs. IC Role / Device Role / Timing Role: Inverting controller regulating negative supplies with tight line/load regulation (±0.5%) and low noise. Use Value: Eliminates need for isolated DC/DC converters; 150°C rating enables placement near heat-generating SoCs without derating. |
Use Scenario: Providing stable –15V bias for op-amps and transimpedance amplifiers in factory-floor vibration and pressure sensors. IC Role / Device Role / Timing Role: High-accuracy inverting regulator with 0.800V feedback reference and <0.01%/V line regulation. Use Value: Maintains sensor offset accuracy across 9–16V automotive input transients; foldback protects during cable short events. |
| Telecom Line Card Bias | Distributed Power Architecture |
|
Use Scenario: Delivering –48V intermediate bus for legacy telecom interface circuits in central office equipment. IC Role / Device Role / Timing Role: High-efficiency inverting controller driving discrete P-MOSFETs with 8V gate bias for low RDS(on) conduction. Use Value: Achieves >92% efficiency at 1A load; programmable 350kHz frequency avoids sensitive 48V signaling bands. |
Use Scenario: Local generation of –5V auxiliary rails from 12V or 24V backplane in modular server and networking hardware. IC Role / Device Role / Timing Role: Compact, thermally robust controller supporting parallel operation via PLL synchronization. Use Value: Enables synchronized multi-phase negative rail generation; DFN package fits dense board areas near ASICs and FPGAs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar inverting DC/DC controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3864HDE#PBF | Non-inverting buck-only topology; lacks VFBN pin and inverting amplifier; same package/temp grade. | Requires positive-output configurations only; cannot generate negative voltages directly. | Select when designing positive step-down rails; not a functional substitute for negative output requirements. |
| LM5180QPWPRQ1 | Automotive-grade flyback controller; synchronous rectification support; no native inverting capability. | Needs transformer-based design for negative outputs; higher BOM cost and layout complexity. | Choose for isolated or multi-output designs where galvanic separation is mandatory. |
Compared with LTC3863HDE#PBF, LTC3864HDE#PBF offers identical thermal and packaging specs but omits inverting functionality, while LM5180QPWPRQ1 adds isolation at the expense of component count and footprint - making LTC3863HDE#PBF the optimal choice for non-isolated, high-efficiency negative rail generation.
Availability
LTC3863HDE#PBF is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial sensor nodes, and telecom line cards requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC3863HDE#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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision, industrial, automotive, and communications markets.
The LTC3863 product line delivers robust, high-voltage DC/DC controllers for demanding negative-rail power conversion - designed specifically for automotive under-hood, industrial automation, and telecom infrastructure applications where reliability and thermal resilience are critical.
FAQ
What is the maximum negative output voltage achievable with the LTC3863HDE#PBF?
The LTC3863HDE#PBF supports negative output voltages from –0.4V up to beyond –150V, limited only by external component ratings (MOSFET VDS, diode reverse voltage, capacitor WV). The datasheet confirms –150V operation in typical applications, and higher voltages are feasible with appropriately rated external parts - no internal clamp restricts the theoretical lower bound.
Does the LTC3863HDE#PBF require an external Schottky diode?
Yes, the LTC3863HDE#PBF is a nonsynchronous inverting controller and requires an external Schottky catch diode (e.g., B540C in the typical application) connected between the inductor and output rail. It does not integrate a synchronous rectifier, so diode conduction losses must be accounted for in efficiency calculations - especially at higher loads.
How does the LTC3863HDE#PBF handle short-circuit conditions?
The LTC3863HDE#PBF responds to short-circuits via frequency foldback: when VFB drops below 0.4V, the switching frequency linearly decreases to ~18% of the programmed value, reducing duty cycle and average current. Combined with fixed 95mV current limit sensing, this limits power dissipation and enables safe recovery without latch-off or external circuitry.
Can the LTC3863HDE#PBF be used in non-inverting (buck) mode?
Yes - by pulling VFBN > 2V (but < 5V), the internal inverting amplifier is disabled, allowing the LTC3863HDE#PBF to operate as a standard buck controller. In this mode, feedback is taken directly to VFB (0.8V reference), and the device regulates positive output voltages - confirmed in the Functional Diagram and Operation section of the datasheet.
What is the thermal performance difference between the MSOP and DFN packages for LTC3863HDE#PBF?
The LTC3863HDE#PBF uses the 12-lead DFN package (4mm × 3mm) with θJC = 5.5°C/W, significantly better than the MSOP's θJC = 10°C/W. This 45% lower junction-to-case resistance allows higher continuous power dissipation at the same ambient temperature - critical for sustained operation at 150°C junction temperature in automotive and industrial environments.
LTC3863HDE#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 or Negative
- Topology:
- Buck
- Number of Outputs:
- 1
- Output Phases:
- 1
- Voltage - Supply (Vcc/Vdd):
- 3.5V ~ 60V
- Frequency - Switching:
- 50kHz ~ 850kHz
- Duty Cycle (Max):
- -
- Synchronous Rectifier:
- No
- Clock Sync:
- No
- Serial Interfaces:
- -
- Control Features:
- Current Limit, Enable, Frequency Control, Soft Start
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-DFN (4x3)
LTC3863HDE#PBF FAQ
1.How can I place an order for LTC3863HDE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3863HDE#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 LTC3863HDE#PBF reliable?
The price and inventory of LTC3863HDE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3863HDE#PBF is usually 5 days.
3.What payment methods are accepted for LTC3863HDE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3863HDE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3863HDE#PBF?
LTC3863HDE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3863HDE#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 LTC3863HDE#PBF?
For technical support, including LTC3863HDE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3863HDE#PBF requirements.
6.How does Aetrix verify that LTC3863HDE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3863HDE#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 LTC3863HDE#PBF meets industry standards.
7.What is the process for return or replacement of LTC3863HDE#PBF?
All LTC3863HDE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3863HDE#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 LTC3863HDE#PBF part is unused and in its original packaging.
Return procedure for LTC3863HDE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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