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Analog Devices Inc. LTC3863EDE#PBF
- Part No.:
- LTC3863EDE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 12-WFDFN Exposed Pad
- Datasheet:
-
LTC3863EDE#PBF.pdf
- Description:
- IC REG CTRLR BUCK 12DFN
- Quantity:
- Payment:
- Shipping:
Inventory:363
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Product details
Overview
LTC3863EDE#PBF from Analog Devices is a 60V-input, inverting PMOS DC/DC controller optimized for automotive and industrial negative-output power supplies. It drives external P-channel MOSFETs to generate regulated negative voltages from –0.4V to –150V, operates from 3.5V–60V input, draws only 70µA quiescent current in Burst Mode, and supports programmable switching frequency from 50kHz to 850kHz. A typical application is a –5V/1.7A telecom supply with 350kHz operation.
For engineers reviewing the LTC3863EDE#PBF datasheet, LTC3863EDE#PBF pinout, LTC3863EDE#PBF application, or LTC3863EDE#PBF equivalent, key selection considerations include its inverting topology, 12-lead 4mm × 3mm DFN package with exposed PGND pad, –40°C to 125°C operating range, 95mV current-sense threshold, and dual light-load modes (Burst Mode vs. pulse-skipping).
Technical Context
The LTC3863EDE#PBF implements peak current mode control with constant-frequency PWM, using an internal transconductance error amplifier (1.8mS) and slope compensation to stabilize loop response. Its inverting architecture relies on VFBN/VFB differential sensing to regulate negative outputs, with VREG = (VFB – VFBN) trimmed to 0.800V ±1%. The gate driver delivers strong pull-up (2Ω) and pull-down (0.9Ω) capability for high-voltage P-MOSFETs, powered by an internal LDO regulating VIN–VCAP to 8.0V.
Frequency programming uses a 20µA current source into the FREQ pin, enabling precise resistor-set operation from 50kHz to 850kHz; synchronization via PLLIN/MODE supports external clock locking from 75kHz to 750kHz. Protection includes overvoltage lockout at +10% of 0.8V, frequency foldback below 0.4V on VFB, and verified adjacent-pin fault tolerance.
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 high-ratio inverting conversion using standard external components |
| Quiescent Current | 70µA in Burst Mode - extends battery life in always-on systems with light-load standby |
| Switching Frequency | 50kHz to 850kHz programmable - balances efficiency, size, and EMI across applications |
| Current Sense Threshold | 95mV (typ.) - sets accurate peak inductor current limit with minimal power loss in RSENSE |
| Feedback Reference | 0.800V ±1% (VFB – VFBN) - ensures tight output regulation across temperature and line variations |
| Shutdown Current | 7µA - enables ultra-low-power system-level disable without auxiliary circuitry |
| Operating Temperature | –40°C to 125°C - qualified for under-hood automotive and harsh industrial environments |
Pinout & Package
The LTC3863EDE#PBF is housed in a thermally enhanced 12-lead (4mm × 3mm) plastic DFN package with exposed PGND pad (Pin 13), requiring soldering to PCB for thermal and electrical performance. θJA = 43°C/W, 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 plane for rated 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 with 2Ω pull-up / 0.9Ω pull-down; requires stable VIN–VCAP bias from CAP pin |
| VIN (Pin 11) | Main Power Supply Input | Supplies chip logic and gate driver; accepts 3.5V–60V; bypass capacitor ≥0.1µF required between VIN and PGND |
| SENSE (Pin 10) | Current Sense Input | Kelvin-connected to RSENSE; measures VIN–SENSE differential to enforce 95mV peak current limit |
| CAP (Pin 9) | Gate Driver Bias Supply | Internal LDO output referenced to VIN; requires ≥0.1µF ceramic cap to VIN for stable 8V gate bias generation |
| RUN (Pin 8) | Enable/Shutdown Control | Digital input with 1.26V threshold; internal 0.4µA pull-up allows direct connection to up to 60V supply |
| VFBN (Pin 7) | Inverting Feedback Reference Node | Connects center of RFB1/RFB2 divider; enables negative-output regulation; >2V disables inverting mode |
| VFB (Pin 5) | Feedback Input | Regulated to 0.800V relative to VFBN; determines output voltage via RFB1/RFB2 ratio in inverting configuration |
| ITH (Pin 6) | Error Amplifier Output / Compensation Point | 0–2.9V control voltage; summed with slope ramp to set peak current threshold; requires RITH ≥10kΩ |
| SS (Pin 4) | Soft-Start / Tracking Input | Internal 10µA pull-up charges external capacitor; regulates VFB to SS voltage during startup or tracking |
| FREQ (Pin 2) | Frequency Programming Input | 20µA current source sets oscillator frequency; 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; external clock = PLL sync (75–750kHz) |
Key Features
| Feature | Design Value |
|---|---|
| Inverting PMOS Controller Topology | Enables single-inductor negative output generation without transformer or charge pump, reducing BOM count and footprint |
| Programmable Burst Mode Operation | 70µA IQ at light load preserves efficiency in battery-powered or standby systems while maintaining regulation |
| Verified Adjacent Pin Fault Tolerance | FMEA-validated against open/short faults between pins, improving reliability in high-vibration or safety-critical deployments |
| Strong Gate Drive with Integrated LDO | VIN–VCAP regulated to 8.0V with <0.5V dropout enables robust drive of high-threshold P-MOSFETs up to 60V input |
| Accurate Current Limit with Kelvin Sensing | 95mV sense threshold with dedicated SENSE pin minimizes PCB layout sensitivity and improves current limit accuracy |
| Flexible Soft-Start and Output Tracking | SS pin supports both capacitor-based soft-start and resistor-divider tracking, ensuring controlled sequencing with other rails |
Applications
| Automotive Infotainment Power | Industrial Sensor Signal Conditioning |
|---|---|
|
Use Scenario: Generating –5V rail for analog front-end ICs in vehicle head units with 12V battery input. IC Role / Device Role / Timing Role: Inverting controller regulating negative supply for op-amps and ADCs requiring clean, low-noise bias. Use Value: Eliminates need for isolated DC/DC or transformer-based solutions; 70µA Burst Mode IQ extends ignition-off battery life. |
Use Scenario: Providing –12V bias for precision instrumentation amplifiers in factory-floor pressure/temperature sensors. IC Role / Device Role / Timing Role: High-voltage inverting controller delivering stable negative rail from 24V industrial bus. Use Value: Wide 3.5V–60V input accommodates brownout conditions; 95mV current limit ensures safe start-up into capacitive loads. |
| Telecom Line Card Bias | Distributed Power Architecture |
|
Use Scenario: Creating –48V intermediate bus from 48V backplane in optical line cards. IC Role / Device Role / Timing Role: Primary inverting controller managing high-efficiency negative output with synchronous rectification support. Use Value: Programmable 50–850kHz frequency allows EMI tuning; frequency foldback protects during short-circuit events. |
Use Scenario: Local –15V generation for FPGA I/O banks in modular server blades with shared 12V mid-rail. IC Role / Device Role / Timing Role: Compact DFN-packaged controller enabling point-of-load negative voltage with minimal board area. Use Value: 4mm × 3mm DFN with exposed PGND achieves low thermal resistance (θJC = 5.5°C/W) for high-density layouts. |
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 |
|---|---|---|---|
| LTC3864EDE#PBF | Non-inverting buck-only topology; lacks VFBN pin and inverting feedback capability | Suitable only for positive-output applications; cannot replace LTC3863EDE#PBF in negative-output designs | Select LTC3863EDE#PBF when negative output is required; LTC3864EDE#PBF only if redesigning for buck topology |
| LM5180QPWPRQ1 | 65V synchronous buck controller with integrated high-side FET; no inverting capability or VFBN node | Designed for automotive positive-output supplies; lacks negative regulation, Burst Mode IQ, and current-sense architecture | LTC3863EDE#PBF remains necessary for inverting configurations; LM5180QPWPRQ1 is not a functional substitute |
Compared with LTC3864EDE#PBF and LM5180QPWPRQ1, the LTC3863EDE#PBF uniquely provides verified inverting operation, differential VFBN/VFB sensing for negative outputs, and sub-100µA light-load IQ-making it irreplaceable in applications requiring compact, efficient, high-voltage negative rails.
Availability
LTC3863EDE#PBF is available at Aetrix Electronics and suitable for automotive infotainment, industrial sensor conditioning, and telecom line card power supplies requiring stable component supply, extended temperature operation, and high-reliability packaging.
Supply support for LTC3863EDE#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 industrial, automotive, communications, and healthcare markets.
The LTC3863EDE#PBF belongs to Analog Devices' Power by Linear™ controller family, engineered specifically for high-voltage, high-efficiency DC/DC conversion in space-constrained and thermally demanding environments.
FAQ
What is the maximum negative output voltage achievable with the LTC3863EDE#PBF?
The LTC3863EDE#PBF supports negative output voltages from –0.4V up to beyond –150V. The practical limit depends on external component ratings-especially the P-MOSFET breakdown voltage, Schottky diode reverse voltage, and output capacitor voltage rating-not on the controller itself. For example, using a 200V-rated MOSFET and 100V diode enables reliable –80V operation with appropriate layout and thermal design.
Does the LTC3863EDE#PBF require an external Schottky diode, and why?
Yes, the LTC3863EDE#PBF requires an external Schottky diode as the commutating catch diode in its nonsynchronous inverting topology. Because it drives only a P-channel high-side MOSFET, the diode provides the return current path during the off-time. A low-forward-voltage, fast-recovery Schottky (e.g., B540C in the typical application) minimizes conduction loss and improves efficiency, especially at higher output currents like 1.7A.
How does the LTC3863EDE#PBF implement frequency foldback during overload?
The LTC3863EDE#PBF activates frequency foldback when VFB drops below 0.4V (50% of 0.8V reference), indicating severe overload or short-circuit. The switching frequency linearly decreases to ~18% of the programmed value, reducing duty cycle and average current. This works in tandem with the fixed 95mV current limit to constrain power dissipation during fault conditions without requiring additional protection circuitry.
Can the LTC3863EDE#PBF be used in non-inverting (buck) mode?
Yes-the LTC3863EDE#PBF can be configured as a non-inverting buck controller by pulling VFBN above 2V (but below 5V), which disables the internal inverting amplifier. In this mode, VFB is referenced directly to SGND, and the output voltage is set by a standard resistive divider from VOUT to VFB. However, this sacrifices the part's core inverting capability and is only recommended when reusing the same PCB footprint for dual-mode designs.
What is the role of the exposed PGND pad (Pin 13) in the LTC3863EDE#PBF DFN package?
The exposed PGND pad (Pin 13) on the LTC3863EDE#PBF serves as both the primary power ground return and the main thermal dissipation path. It must be soldered to a large PCB copper area to achieve the specified θJC = 5.5°C/W and ensure reliable operation at full load. Leaving it unconnected degrades thermal performance, increases junction temperature, and may trigger thermal shutdown or reduce long-term reliability.
LTC3863EDE#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 ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-DFN (4x3)
LTC3863EDE#PBF FAQ
1.How can I place an order for LTC3863EDE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3863EDE#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 LTC3863EDE#PBF reliable?
The price and inventory of LTC3863EDE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3863EDE#PBF is usually 5 days.
3.What payment methods are accepted for LTC3863EDE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3863EDE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3863EDE#PBF?
LTC3863EDE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3863EDE#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 LTC3863EDE#PBF?
For technical support, including LTC3863EDE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3863EDE#PBF requirements.
6.How does Aetrix verify that LTC3863EDE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3863EDE#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 LTC3863EDE#PBF meets industry standards.
7.What is the process for return or replacement of LTC3863EDE#PBF?
All LTC3863EDE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3863EDE#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 LTC3863EDE#PBF part is unused and in its original packaging.
Return procedure for LTC3863EDE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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