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Analog Devices Inc. LTC3863EDE#TRPBF
- Part No.:
- LTC3863EDE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 12-WFDFN Exposed Pad
- Datasheet:
-
LTC3863EDE#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 12DFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,340
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Product details
Overview
LTC3863EDE#TRPBF from Analog Devices is a 60V-input, inverting PMOS DC/DC controller optimized for automotive and industrial negative rail generation. It drives an external P-channel MOSFET to produce regulated negative outputs 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 power supplies requiring high-voltage negative bias.
For engineers reviewing the LTC3863EDE#TRPBF datasheet, LTC3863EDE#TRPBF pinout, LTC3863EDE#TRPBF application, or LTC3863EDE#TRPBF equivalent, key selection criteria include its wide 3.5V–60V input range, –0.4V to –150V output capability, 70µA light-load IQ, phase-lockable synchronization (75kHz–750kHz), and dual-mode light-load operation (Burst Mode or pulse-skipping).
Technical Context
The LTC3863EDE#TRPBF implements peak current mode control with constant-frequency PWM architecture, using an internal transconductance error amplifier (1.8mS) and slope compensation to stabilize inductor current regulation. Its inverting topology relies on VFBN/VFB differential sensing to regulate negative outputs, with VREG = (VFB – VFBN) trimmed to 0.800V ±9mV.
It integrates a dedicated gate driver LDO that regulates VIN–VCAP to 8.0V (±0.4V), delivering strong pull-up (2Ω) and pull-down (0.9Ω) drive for high-side P-MOSFETs, while supporting UVLO (3.25V typical turn-on, 3.0V turn-off) and frequency foldback triggered below 0.4V on VFB - critical for short-circuit protection in distributed power systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5V to 60V - supports 12V/24V/48V automotive and industrial bus inputs without pre-regulation |
| Negative Output Range | –0.4V to –150V - enables wide-range bias generation for op-amps, ADCs, and RF stages |
| Quiescent Current | 70µA in Burst Mode - extends battery life in always-on monitoring systems |
| Switching Frequency | 50kHz to 850kHz (resistor-programmable) - allows EMI optimization and inductor size reduction |
| Synchronization Range | 75kHz to 750kHz - enables multi-rail timing coherence in telecom line cards |
| Feedback Reference | 0.800V ±9mV (VFB–VFBN) - ensures precise negative output regulation across temperature |
| Gate Driver Bias | VIN–VCAP = 8.0V ±0.4V - provides robust P-MOSFET turn-on margin up to 60V input |
| Current Limit Threshold | 95mV ±10mV at SENSE - sets accurate peak inductor current limit independent of VIN |
Pinout & Package
The LTC3863EDE#TRPBF is housed in a thermally enhanced 12-lead (4mm × 3mm) plastic DFN package with exposed PGND pad (Pin 13) requiring PCB soldering for thermal and electrical integrity. 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 ground plane for rated thermal performance and low-noise return path |
| GATE (Pin 12) | P-MOSFET Gate Drive Output | High-current driver with 2Ω pull-up / 0.9Ω pull-down; delivers full 8V gate bias when VIN > 8V |
| VIN (Pin 11) | Main Power Supply Input | Supplies chip logic and gate driver LDO; requires ≥0.1µF ceramic bypass to PGND |
| SENSE (Pin 10) | Current Sense Input | Kelvin-connected to RSENSE; measures (VIN–SENSE) voltage to enforce 95mV peak current limit |
| CAP (Pin 9) | Gate Driver Bias Capacitor Node | Requires ≥0.1µF low-ESR ceramic between VIN and CAP to stabilize 8V LDO output |
| RUN (Pin 8) | Enable/Shutdown Control | 1.26V threshold; internal 0.4µA pull-up enables direct connection to 60V supply or logic-level signals |
| VFBN (Pin 7) | Inverting Feedback Reference | Connects to center of RFB1/RFB2 divider; enables negative output sensing via differential (VFB–VFBN) = 0.8V |
| VFB (Pin 5) | Feedback Reference Input | Regulated to 0.8V nominal; combined with VFBN forms precision inverting amplifier reference |
| ITH (Pin 6) | Error Amplifier Output / Compensation | 0–2.9V control node; sets peak current threshold with slope compensation; RITH ≥10kΩ required |
| SS (Pin 4) | Soft-Start / Tracking Input | Internal 10µA pull-up charges external capacitor; regulates VFB to SS voltage during ramp-up |
| FREQ (Pin 2) | Frequency Setpoint Input | 20µA current source develops voltage across RFREQ; sets oscillator from 50kHz–850kHz |
| PLLIN/MODE (Pin 1) | Clock Sync Input / Light-Load Mode Select | Floating = Burst Mode (70µA IQ); grounded = pulse-skipping; driven = PLL sync (75–750kHz) |
Key Features
| Feature | Design Value |
|---|---|
| Programmable Burst Mode | Reduces IQ to 70µA at light loads while maintaining regulation - critical for battery-backed instrumentation |
| Phase-Lockable Oscillator | Locks GATE edge to external clock (75–750kHz) - eliminates beat frequencies in multi-converter systems |
| Verified FMEA for Adjacent Pins | Guarantees safe operation under open/short faults between neighboring pins - meets ASIL-B readiness |
| Integrated Gate Bias LDO | Delivers stable 8V (VIN–VCAP) drive for P-MOSFETs up to 60V input - eliminates external bias supply |
| Frequency Foldback Protection | Reduces switching frequency to ~18% of setpoint when VFB < 0.4V - limits inrush and short-circuit energy |
| Programmable Soft-Start or Tracking | Enables controlled VOUT ramp or synchronized startup with positive rails - prevents system latch-up |
Applications
| Industrial Sensor Bias Supply | Automotive Camera Power |
|---|---|
Use Scenario: Providing isolated –5V bias to high-speed image sensor analog front-ends in ADAS cameras. IC Role / Device Role / Timing Role: Inverting controller generating stable negative rail from 12V vehicle battery, with fast transient response to pixel readout current spikes. Use Value: 70µA Burst Mode IQ extends camera module standby time; 350kHz fixed frequency avoids EMI interference with video clock. | Use Scenario: Generating –12V for CCD sensor bias in rear-view camera modules operating across –40°C to 125°C. IC Role / Device Role / Timing Role: Robust inverting controller with verified adjacent-pin FMEA, driving P-MOSFET in harsh automotive environment. Use Value: Wide 3.5V–60V input accommodates cold-crank (6V) and load-dump (60V); 125°C-rated DFN package ensures reliability. |
| Telecom Line Card Negative Rail | Distributed Data Acquisition System |
Use Scenario: Creating –48V auxiliary bias for op-amp buffers and DAC references in 1RU telecom line cards. IC Role / Device Role / Timing Role: High-voltage inverting controller synchronized to system clock via PLLIN/MODE to suppress conducted EMI. Use Value: 75–750kHz PLL sync enables deterministic noise placement; 60V max input handles hot-swap transients. | Use Scenario: Supplying –15V to precision ADC drivers and instrumentation amplifiers in modular DAQ chassis. IC Role / Device Role / Timing Role: Programmable inverting controller with soft-start tracking to coordinate with +15V main rail during cold start. Use Value: SS pin tracking prevents reverse bias on signal chain components; 0.8V feedback reference ensures <±1% output accuracy. |
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#TRPBF | Non-inverting buck-only topology; no VFBN pin; lacks inverting capability | Only suitable for positive-output applications; cannot replace LTC3863EDE#TRPBF in negative-rail designs | Select only if design requires +VOUT and shares same DFN footprint and temperature grade |
| LM5180QPWPRQ1 | 65V synchronous buck controller; no inverting support; higher IQ (120µA) | Designed for automotive 12V-to-3.3V/5V conversion; lacks negative output capability and Burst Mode | Consider only for positive-rail automotive applications where synchronous efficiency outweighs IQ penalty |
Compared with LTC3864EDE#TRPBF and LM5180QPWPRQ1, the LTC3863EDE#TRPBF is uniquely qualified for high-reliability negative rail generation - offering inverting topology, 70µA Burst Mode IQ, and verified fault tolerance not available in either alternative.
Availability
LTC3863EDE#TRPBF is available at Aetrix Electronics and suitable for automotive camera modules, telecom line cards, industrial sensor bias supplies, and distributed data acquisition systems requiring stable component supply across extended temperature ranges.
Supply support for LTC3863EDE#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 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 inverting controllers for negative rail generation in harsh environments - designed specifically for automotive ADAS, telecom infrastructure, and industrial instrumentation where reliability and wide input range are critical.
FAQ
What is the maximum negative output voltage achievable with the LTC3863EDE#TRPBF?
The LTC3863EDE#TRPBF supports negative output voltages from –0.4V to beyond –150V. The practical limit depends on external components - including MOSFET breakdown voltage, diode rating, and inductor saturation current - rather than the controller itself. For example, with a 60V input and appropriate 200V-rated external components, –120V output is routinely achieved in telecom applications.
Does the LTC3863EDE#TRPBF require an external P-channel MOSFET?
Yes, the LTC3863EDE#TRPBF is a controller IC and requires an external P-channel power MOSFET to implement the inverting topology. It provides high-current gate drive (2Ω pull-up, 0.9Ω pull-down) and regulates the gate bias voltage (VIN–VCAP) to 8.0V, eliminating the need for an external gate driver or bias supply.
How does the LTC3863EDE#TRPBF achieve 70µA quiescent current?
The LTC3863EDE#TRPBF achieves 70µA quiescent current in Burst Mode by disabling most internal circuitry when the ITH voltage drops below 0.425V. During sleep mode, the error amplifier disconnects from ITH, which is held at 0.55V, and only essential bias currents remain active - enabling ultra-low power operation while maintaining output regulation via output capacitor hold-up.
Can the LTC3863EDE#TRPBF be used for positive-output buck conversion?
Yes - the LTC3863EDE#TRPBF can be configured as a noninverting buck regulator by pulling VFBN above 2V (but below 5V), which disables the internal inverting amplifier. In this mode, it regulates VFB to 0.8V using a standard resistor divider from VOUT to SGND, functioning identically to the LTC3864 but retaining all other features including Burst Mode and frequency programming.
What is the purpose of the exposed pad (Pin 13) on the LTC3863EDE#TRPBF DFN package?
The exposed pad (Pin 13) on the LTC3863EDE#TRPBF is PGND - the power ground reference for high-current paths. It must be soldered to the PCB ground plane to ensure both electrical integrity (low-inductance return path for gate drive and switch currents) and thermal performance (θJA = 43°C/W). Failure to solder the pad degrades efficiency, increases junction temperature, and risks thermal shutdown.
LTC3863EDE#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 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#TRPBF FAQ
1.How can I place an order for LTC3863EDE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3863EDE#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 LTC3863EDE#TRPBF reliable?
The price and inventory of LTC3863EDE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3863EDE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3863EDE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3863EDE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3863EDE#TRPBF?
LTC3863EDE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3863EDE#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 LTC3863EDE#TRPBF?
For technical support, including LTC3863EDE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3863EDE#TRPBF requirements.
6.How does Aetrix verify that LTC3863EDE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3863EDE#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 LTC3863EDE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3863EDE#TRPBF?
All LTC3863EDE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3863EDE#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 LTC3863EDE#TRPBF part is unused and in its original packaging.
Return procedure for LTC3863EDE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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