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Analog Devices Inc. LTC3863IDE#TRPBF
- Part No.:
- LTC3863IDE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 12-WFDFN Exposed Pad
- Datasheet:
-
LTC3863IDE#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 12DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,915
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Product details
Overview
LTC3863IDE#TRPBF 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 peak current mode control with accurate 95mV current limit threshold - deployed in telecom distributed supplies and ruggedized vehicle ECUs.
For engineers reviewing the LTC3863IDE#TRPBF datasheet, LTC3863IDE#TRPBF pinout, LTC3863IDE#TRPBF application, or LTC3863IDE#TRPBF equivalent, key selection considerations include its 12-lead DFN package with exposed PGND pad, –40°C to 125°C operating junction range, inverting topology compatibility, and dual light-load operation modes (Burst Mode vs. pulse-skipping) affecting efficiency/noise trade-offs in battery-backed systems.
Technical Context
The LTC3863IDE#TRPBF implements a nonsynchronous, peak current mode, constant-frequency PWM architecture with an internal transconductance error amplifier (1.8mS) and slope compensation. Its inverting feedback structure uses VFBN and VFB pins to sense negative output voltage via resistor divider, enabling precise regulation of VOUT = –(RFB1/RFB2) × 0.8V.
It integrates a dedicated 8V gate bias LDO (VIN–VCAP), programmable frequency setpoint via FREQ pin (20µA current source), and phase-lockable PLL synchronized to external clocks from 75kHz to 750kHz. Fault protection includes overvoltage lockout (10% above 0.8V), frequency foldback below 0.4V on VFB, and verified adjacent-pin open/short FMEA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5V to 60V - supports wide automotive battery transients and industrial 48V rails without pre-regulation. |
| Negative Output Range | –0.4V to –150V - enables high-ratio inverting conversion using standard external components. |
| Quiescent Current (Burst Mode) | 70µA - sustains ultra-low standby power in always-on vehicle modules and IoT edge nodes. |
| Switching Frequency Range | 50kHz to 850kHz - allows optimization of size (higher f) vs. EMI/efficiency (lower f) across applications. |
| Current Limit Threshold | 95mV (typ) at SENSE pin - sets precise peak inductor current limit independent of temperature drift. |
| Feedback Reference Voltage | 0.800V ±0.009V - ensures tight output regulation accuracy across load, line, and temperature. |
| Operating Junction Temp | –40°C to 125°C - qualified for under-hood automotive and industrial control cabinet environments. |
Pinout & Package
Package: 12-lead (4mm × 3mm) plastic DFN with exposed PGND pad (Pin 13), thermally enhanced for high-power density designs. Exposed pad must be soldered to PCB for electrical continuity and thermal performance (θJC = 5.5°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PGND (Pin 13) | Power Ground Reference | Primary return path for high-current MOSFET switching and diode conduction; must be low-impedance copper pour connected directly to exposed pad. |
| GATE (Pin 12) | P-Channel MOSFET Gate Driver Output | Drives external high-side PMOS switch with strong pull-up (2Ω) and pull-down (0.9Ω) capability; biased by internal 8V LDO (VIN–VCAP). |
| VIN (Pin 11) | Controller Supply Input | Provides power to internal circuitry; requires ≥0.1µF low-ESR ceramic bypass capacitor to PGND. |
| SENSE (Pin 10) | Current Sense Input | Differential input measuring voltage across RSENSE (VIN–SENSE); sets peak current limit at 95mV with Kelvin connection required. |
| CAP (Pin 9) | Gate Bias LDO Input | Input to internal 8V LDO; requires ≥0.1µF low-ESR ceramic capacitor between VIN and CAP for stable gate drive. |
| RUN (Pin 8) | Enable/Shutdown Control | Logic-level enable pin with 1.26V threshold; internal 0.4µA pull-up allows direct connection to up to 60V supply. |
| VFBN (Pin 7) | Inverting Feedback Node | Center tap of RFB1/RFB2 divider for negative output sensing; tied >2V to disable inverting mode and configure as buck regulator. |
| VFB (Pin 5) | Feedback Reference Input | Regulated to 0.800V; used with VFBN to close inverting loop or with SGND in noninverting buck configuration. |
| ITH (Pin 6) | Error Amplifier Output / Compensation | Current threshold node (0–2.9V range); connects to RC network for loop stability and slope compensation injection. |
| SS (Pin 4) | Soft-Start / Tracking Input | Internal 10µA pull-up charges external capacitor for controlled ramp; also accepts external voltage for output tracking during startup. |
| FREQ (Pin 2) | Frequency Setpoint Input | 20µA current source develops voltage across RFREQ to program 50–850kHz; grounded = 350kHz, floating = 535kHz. |
| PLLIN/MODE (Pin 1) | External Clock Input / Light-Load Mode Select | Accepts 75–750kHz sync clock; floating = Burst Mode (70µA IQ), grounded = pulse-skipping mode. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable Burst Mode Operation | Reduces no-load IQ to 70µA while maintaining regulation - critical for battery-powered remote sensors and telematics. |
| Verified Adjacent Pin FMEA | Guaranteed robustness against short/open faults between neighboring pins - meets ASIL-B functional safety requirements. |
| Strong PMOS Gate Driver | 2Ω pull-up / 0.9Ω pull-down with 8V gate bias LDO - ensures fast, low-loss switching of high-voltage P-channel MOSFETs. |
| Frequency Foldback Protection | Automatically reduces switching frequency to ~18% of setpoint when VFB < 0.4V - limits inrush and short-circuit current without external circuitry. |
| Programmable Soft-Start or Tracking | Single SS pin supports either capacitor-ramped startup or coordinated sequencing with other rails - simplifies multi-rail system design. |
Applications
| Automotive Infotainment Power | Industrial Process Controller |
|---|---|
|
Use Scenario: Generating –5V rail for analog audio codecs and op-amp biasing in head-unit systems exposed to 12V/24V battery transients. IC Role / Device Role / Timing Role: Inverting controller regulating negative output using external Si7129 PMOS and B540C Schottky diode. Use Value: 70µA Burst Mode IQ extends battery runtime during vehicle sleep mode; 60V input withstands load-dump events up to 65V. |
Use Scenario: Providing isolated –12V supply for RS-485 transceivers and sensor signal conditioning in factory automation PLCs. IC Role / Device Role / Timing Role: Nonsynchronous inverting controller driving high-side PMOS with programmable 350kHz switching for EMI control. Use Value: Wide –40°C to 125°C junction range ensures reliable operation inside sealed enclosures; frequency foldback prevents latch-up during field wiring shorts. |
| Telecom Line Card Supply | Distributed Data Acquisition System |
|
Use Scenario: Deriving –48V auxiliary bias from +48V backplane in optical line terminal (OLT) cards requiring low-noise analog sections. IC Role / Device Role / Timing Role: High-voltage inverting controller configured with precision RFB1/RFB2 divider for ±0.5% output accuracy. Use Value: 0.800V reference tolerance and <±0.015% load regulation minimize offset errors in ADC reference buffers and DAC output stages. |
Use Scenario: Powering –15V op-amps and precision ADC front-ends in modular I/O systems with mixed-signal signal chains. IC Role / Device Role / Timing Role: Dual-mode controller operating in pulse-skipping mode to suppress audible noise in lab-grade instrumentation. Use Value: Programmable soft-start prevents inrush-induced voltage droop on shared +5V/+3.3V rails during hot-plug insertion of acquisition modules. |
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#TRPBF | Noninverting buck-only topology; lacks VFBN pin and inverting feedback capability. | Suitable only for positive-output step-down, not negative-output generation. | Select LTC3863IDE#TRPBF when negative rail generation is required; LTC3864IDE#TRPBF only if topology is strictly buck. |
| LM5180QDGQRQ1 | 65V synchronous buck controller with integrated high-side FET; no inverting capability or PMOS gate drive. | Designed for automotive 12V-to-3.3V/5V conversion; cannot produce negative outputs. | LTC3863IDE#TRPBF remains necessary for any application requiring regulated negative voltage from a single positive input. |
Compared with LTC3864IDE#TRPBF and LM5180QDGQRQ1, the LTC3863IDE#TRPBF uniquely delivers true inverting control with PMOS gate drive, enabling compact negative rail generation where alternatives require additional external components or cannot meet the topology requirement.
Availability
LTC3863IDE#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial process controllers, and telecom line card power supplies requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC3863IDE#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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, communications, and industrial markets.
The LTC3863IDE#TRPBF belongs to Analog Devices' Power by Linear™ controller family, designed specifically for rugged, high-voltage DC/DC conversion in automotive, industrial, and telecom infrastructure where reliability, wide input range, and negative output capability are essential.
FAQ
What is the maximum negative output voltage achievable with the LTC3863IDE#TRPBF?
The LTC3863IDE#TRPBF supports negative output voltages from –0.4V to beyond –150V. The practical limit depends on external component ratings - particularly the breakdown voltage of the external P-channel MOSFET and Schottky catch diode, plus the voltage rating of the output capacitor. Higher ratios are possible with transformer-based variants, but the base LTC3863IDE#TRPBF achieves –150V with appropriate component selection.
Does the LTC3863IDE#TRPBF support synchronization to an external clock?
Yes, the LTC3863IDE#TRPBF supports clock synchronization via its PLLIN/MODE pin (Pin 1). It locks to external clock frequencies from 75kHz to 750kHz, aligning the rising edge of the GATE signal with the external clock's rising edge. This feature enables EMI reduction in multi-converter systems and deterministic timing in synchronized power architectures using the LTC3863IDE#TRPBF.
How does the LTC3863IDE#TRPBF implement overvoltage protection?
The LTC3863IDE#TRPBF monitors the VFB pin and triggers overvoltage protection when VFB exceeds +10% of the 0.8V reference (i.e., >0.88V). Upon detection, the GATE output is immediately disabled and held off until VFB falls below +7.5% (0.86V). This fast-response OVP protects downstream analog circuitry powered by the negative rail generated by the LTC3863IDE#TRPBF.
Can the LTC3863IDE#TRPBF be used in noninverting buck configuration?
Yes - the LTC3863IDE#TRPBF can be reconfigured as a noninverting buck controller by pulling VFBN (Pin 7) to a voltage >2V and <5V (e.g., via resistor divider from VIN), which disables the internal inverting amplifier. In this mode, VFB senses the positive output directly against the 0.8V reference, and the LTC3863IDE#TRPBF operates as a standard peak current mode buck controller.
What is the purpose of the exposed pad (Pin 13) on the LTC3863IDE#TRPBF DFN package?
The exposed pad (Pin 13) of the LTC3863IDE#TRPBF is designated PGND and serves as the primary power ground return. It must be soldered to a large PCB copper pour for both electrical integrity and thermal dissipation - achieving θJC = 5.5°C/W. Failure to connect it compromises switching performance, thermal limits, and EMI behavior in high-current inverting converter designs using the LTC3863IDE#TRPBF.
LTC3863IDE#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)
LTC3863IDE#TRPBF FAQ
1.How can I place an order for LTC3863IDE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3863IDE#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 LTC3863IDE#TRPBF reliable?
The price and inventory of LTC3863IDE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3863IDE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3863IDE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3863IDE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3863IDE#TRPBF?
LTC3863IDE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3863IDE#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 LTC3863IDE#TRPBF?
For technical support, including LTC3863IDE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3863IDE#TRPBF requirements.
6.How does Aetrix verify that LTC3863IDE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3863IDE#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 LTC3863IDE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3863IDE#TRPBF?
All LTC3863IDE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3863IDE#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 LTC3863IDE#TRPBF part is unused and in its original packaging.
Return procedure for LTC3863IDE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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