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Analog Devices Inc. LTC3863IDE#PBF
- Part No.:
- LTC3863IDE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 12-WFDFN Exposed Pad
- Datasheet:
-
LTC3863IDE#PBF.pdf
- Description:
- IC REG CTRLR BUCK 12DFN
- Quantity:
- Payment:
- Shipping:
Inventory:250
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Product details
Overview
LTC3863IDE#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 with 70µA quiescent current in Burst Mode, supports 50kHz–850kHz programmable switching frequency, and features integrated gate driver with 8V VIN–VCAP bias regulation - used in telecom distributed negative rails and industrial sensor biasing.
For engineers reviewing the LTC3863IDE#PBF datasheet, LTC3863IDE#PBF pinout, LTC3863IDE#PBF application, or LTC3863IDE#PBF equivalent, key selection criteria include its wide 3.5V–60V input range, programmable soft-start/tracking, frequency foldback protection during short-circuit, and compatibility with thermally enhanced 12-lead DFN packaging for high-density PCB layouts.
Technical Context
The LTC3863IDE#PBF implements peak current mode control with constant-frequency PWM architecture, using an internal transconductance error amplifier (1.8mS) and slope compensation to regulate negative output voltage via inverting feedback (VFBN/VFB). Its oscillator supports resistor-programmed or PLL-synchronized operation between 75kHz and 750kHz.
It integrates a dedicated 8V LDO for P-MOSFET gate drive (VIN–VCAP), with dropout behavior below 3.25V, and employs dual-mode light-load management: selectable Burst Mode (70µA IQ) or pulse-skipping, both triggered via PLLIN/MODE pin configuration without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5V to 60V - supports 12V/24V/48V automotive and industrial bus inputs with UVLO at 3.25V |
| Negative Output Range | –0.4V to –150V - enables wide-range bias generation for op-amps, ADCs, and RF front-ends |
| Quiescent Current | 70µA in Burst Mode - ensures >90% efficiency at 1mA load in battery-backed systems |
| Switching Frequency | 50kHz–850kHz programmable - allows EMI optimization and inductor size reduction |
| Gate Driver Bias | VIN–VCAP = 8V (regulated) - delivers strong turn-on drive for high-side P-MOSFETs up to 100V VDS |
| Current Limit Threshold | 95mV (typ) at SENSE pin - sets precise peak inductor current limit independent of temperature |
| Feedback Reference | 0.800V ±1% (VFB–VFBN) - enables accurate negative output regulation with standard resistor dividers |
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 and 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 thermal performance and low-noise return path |
| GATE (Pin 12) | P-MOSFET Gate Driver Output | Drives external high-side P-channel MOSFET; sourced from regulated VIN–VCAP supply |
| VIN (Pin 11) | Main Power Input Supply | Supplies IC core and gate driver; requires ≥0.1µF ceramic bypass to PGND |
| SENSE (Pin 10) | Current Sense Input | Kelvin-connected to RSENSE across VIN–SENSE; sets peak current limit at 95mV/RSENSE |
| CAP (Pin 9) | Gate Driver Bias Capacitor Node | Requires ≥0.1µF low-ESR ceramic cap to VIN; forms LDO output filter for stable 8V gate bias |
| RUN (Pin 8) | Enable/Shutdown Control | Logic-compatible input; 1.26V threshold enables operation; draws only 7µA in shutdown |
| VFBN (Pin 7) | Inverting Feedback Input | Connects to center of RFB1/RFB2 divider; enables negative output sensing (0V reference) |
| VFB (Pin 5) | Feedback Reference Input | Regulated to 0.800V; difference with VFBN sets output voltage: VOUT = –(RFB1/RFB2) × 0.8V |
| ITH (Pin 6) | Error Amplifier Output / Compensation | 0–2.9V control node; summed with slope ramp to set peak inductor current threshold |
| SS (Pin 4) | Soft-Start / Tracking Input | Internal 10µA pull-up charges external capacitor; regulates VFB to SS voltage during startup |
| FREQ (Pin 2) | Frequency Setpoint Input | 20µA current source develops voltage across RFREQ; sets fSW from 50kHz–850kHz |
| PLLIN/MODE (Pin 1) | Sync Clock Input / Light-Load Mode Select | Floating = Burst Mode (70µA); grounded = pulse-skipping; driven = PLL sync (75–750kHz) |
Key Features
| Feature | Design Value |
|---|---|
| Programmable Burst Mode | Reduces IQ to 70µA while maintaining regulation - critical for always-on automotive modules |
| Frequency Foldback Protection | Automatically reduces fSW to ~18% of setpoint when VFB < 0.4V - limits inrush and short-circuit current |
| Verified FMEA for Adjacent Pin Faults | Guaranteed safe operation under open/short faults between any two adjacent pins - meets ASIL-B readiness |
| Accurate Current Limit | ±5% tolerance on 95mV sense threshold across temperature - enables reliable overcurrent response |
| Thermally Enhanced DFN | 4mm × 3mm footprint with exposed PGND pad - achieves 43°C/W θJA for compact high-power designs |
Applications
| Industrial Sensor Biasing | Automotive Infotainment Rail |
|---|---|
Use Scenario: Generating –5V or –12V bias for precision analog front-ends in factory automation sensors. IC Role / Device Role / Timing Role: Inverting controller regulating negative rail with tight line/load regulation (±0.5%) and low noise. Use Value: Enables single-inductor negative conversion from 12V bus, eliminating need for isolated DC/DC or charge pumps. | Use Scenario: Providing stable –3.3V supply for audio codec ICs and display drivers in head-unit systems. IC Role / Device Role / Timing Role: High-reliability PMOS controller with UVLO (3.25V) and thermal shutdown for 12V/24V vehicle battery inputs. Use Value: Survives cold-crank (4.5V) and load-dump (60V) transients while maintaining regulated negative output. |
| Telecom Distributed Power | Test & Measurement Equipment |
Use Scenario: Creating –48V intermediate bus from +48V backplane in modular telecom shelves. IC Role / Device Role / Timing Role: High-voltage inverting controller supporting >100V output swing with programmable frequency synchronization. Use Value: Allows phase-aligned switching across multiple LTC3863IDE#PBF units to reduce system-level EMI peaks. | Use Scenario: Supplying –15V for op-amp rails and DAC reference buffers in portable bench instruments. IC Role / Device Role / Timing Role: Low-IQ (70µA) controller enabling battery-operated operation with soft-start tracking to avoid output overshoot. Use Value: Internal 10µA SS pull-up and programmable tracking eliminate external timing components and simplify BOM. |
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 |
|---|---|---|---|
| LTC3864IDE#PBF | Non-inverting buck-only topology; lacks VFBN pin and inverting feedback capability | Suitable only for positive-output step-down; cannot replace LTC3863IDE#PBF in negative-rail designs | Select LTC3863IDE#PBF when negative output generation is required; LTC3864IDE#PBF only for positive buck conversion |
| LM5180QPWPRQ1 | 65V synchronous buck controller with integrated high-side FET; no inverting capability or VFBN interface | Designed for automotive 12V-to-3.3V/5V conversion; no support for negative outputs or P-MOSFET drive | LTC3863IDE#PBF remains necessary for inverting topologies; LM5180QPWPRQ1 is not a functional substitute |
Compared with LTC3864IDE#PBF and LM5180QPWPRQ1, the LTC3863IDE#PBF uniquely provides verified inverting operation with VFBN-based feedback, making it irreplaceable for negative-rail generation - neither alternative supports the same circuit topology or pin-level functionality.
Availability
LTC3863IDE#PBF is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial sensor nodes, and telecom distributed power supplies requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC3863IDE#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 LTC3863IDE#PBF belongs to Analog Devices' Power by Linear™ controller family, designed specifically for robust, high-voltage DC/DC conversion in harsh environments where reliability, wide input range, and fault resilience are mandatory.
FAQ
What is the maximum negative output voltage achievable with the LTC3863IDE#PBF?
The LTC3863IDE#PBF supports negative output voltages from –0.4V to beyond –150V. The practical limit depends on external components - particularly the voltage rating of the P-MOSFET, catch diode, and output capacitor - rather than the controller itself. For example, using a 200V-rated MOSFET and 200V diode enables stable –120V output at moderate current. The LTC3863IDE#PBF's internal architecture imposes no hard ceiling on VOUT magnitude.
Does the LTC3863IDE#PBF require an external Schottky diode, and why?
Yes, the LTC3863IDE#PBF requires an external Schottky catch diode (e.g., B540C in the typical application) because it is a nonsynchronous inverting controller. Unlike synchronous buck controllers, it lacks a second integrated switch; the diode provides the commutation path for inductor current during the P-MOSFET off-time. Schottky selection minimizes forward voltage drop and recovery losses, directly improving efficiency - especially critical at high frequencies and light loads where the LTC3863IDE#PBF operates.
How does the frequency foldback feature protect the LTC3863IDE#PBF during output short-circuit?
When the LTC3863IDE#PBF detects VFB falling below 0.4V - indicating severe overload or short-circuit - it initiates frequency foldback, reducing switching frequency to ~18% of the programmed value. This lowers peak inductor current per cycle and average power dissipation, preventing thermal runaway and MOSFET failure. The foldback ratio scales with the set frequency, ensuring consistent protection across all operating points - a key safety mechanism explicitly verified in the LTC3863IDE#PBF's fault protection architecture.
Can the LTC3863IDE#PBF be used in non-inverting buck configuration?
Yes, the LTC3863IDE#PBF can be configured as a non-inverting buck regulator by pulling VFBN above 2V (but below 5V), which disables the internal inverting amplifier. In this mode, feedback connects directly from VOUT to VFB (with SGND as reference), and regulation follows VOUT = ((RFB1 + RFB2)/RFB2) × 0.8V. However, this sacrifices the LTC3863IDE#PBF's primary differentiator - true inverting capability - and should only be used when positive output is needed and no dedicated buck controller is available.
What is the role of the CAP pin on the LTC3863IDE#PBF, and what capacitor value is required?
The CAP pin on the LTC3863IDE#PBF serves as the output node of an internal LDO that generates the 8V gate bias supply (VIN–VCAP) for driving external P-channel MOSFETs. A minimum 0.1µF low-ESR ceramic capacitor must be placed between VIN and CAP to stabilize the LDO and ensure clean gate drive. For higher-current applications, Analog Devices recommends sizing the capacitor to be ≥10× the effective Miller capacitance (CMILLER) of the selected MOSFET - a design requirement explicitly validated for reliable LTC3863IDE#PBF operation.
LTC3863IDE#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)
LTC3863IDE#PBF FAQ
1.How can I place an order for LTC3863IDE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3863IDE#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 LTC3863IDE#PBF reliable?
The price and inventory of LTC3863IDE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3863IDE#PBF is usually 5 days.
3.What payment methods are accepted for LTC3863IDE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3863IDE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3863IDE#PBF?
LTC3863IDE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3863IDE#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 LTC3863IDE#PBF?
For technical support, including LTC3863IDE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3863IDE#PBF requirements.
6.How does Aetrix verify that LTC3863IDE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3863IDE#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 LTC3863IDE#PBF meets industry standards.
7.What is the process for return or replacement of LTC3863IDE#PBF?
All LTC3863IDE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3863IDE#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 LTC3863IDE#PBF part is unused and in its original packaging.
Return procedure for LTC3863IDE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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