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Analog Devices Inc. LTC3863HDE#TRPBF
- Part No.:
- LTC3863HDE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 12-WFDFN Exposed Pad
- Datasheet:
-
LTC3863HDE#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 12DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,004
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Product details
Overview
LTC3863HDE#TRPBF from Analog Devices is a high-voltage, low-quiescent-current inverting DC/DC PMOS controller for automotive and industrial negative power rails. It drives an external P-channel MOSFET to generate regulated negative outputs from –0.4V to –150V, operates from 3.5V–60V input, draws only 70µA in Burst Mode, and supports programmable switching frequency from 50kHz to 850kHz. It is used in telecom distributed supplies requiring robust start-up into prebiased loads.
For engineers reviewing the LTC3863HDE#TRPBF datasheet, LTC3863HDE#TRPBF pinout, LTC3863HDE#TRPBF application, or LTC3863HDE#TRPBF equivalent, key selection criteria include its –40°C to 150°C junction temperature rating, 12-lead 4mm × 3mm DFN package with exposed PGND pad, inverting topology support, frequency foldback under short-circuit, and dual light-load modes (Burst Mode vs. pulse-skipping).
Technical Context
The LTC3863HDE#TRPBF implements peak current mode control with a constant-frequency PWM architecture, using an internal transconductance error amplifier (1.8mS) and slope compensation to stabilize duty cycle. Its inverting feedback structure relies on 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 gate bias LDO (VIN–VCAP) regulated to 8V (typ.) for strong P-MOSFET drive, with dropout behavior below 3.25V (typ.), and features verified FMEA for adjacent pin open/short faults. Protection includes overvoltage lockout (10% above 0.8V), cycle-by-cycle current limit (95mV threshold), and automatic frequency foldback when VFB falls below 0.4V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5V to 60V - supports wide automotive battery transients and industrial 48V systems without external pre-regulation. |
| Negative Output Range | –0.4V to –150V - enables deep negative rails for op-amp biasing, RF bias, or telecom line cards. |
| Quiescent Current (Burst Mode) | 70µA - extends battery life in always-on automotive modules and remote sensors. |
| Switching Frequency Range | 50kHz to 850kHz - allows optimization between EMI compliance, inductor size, and efficiency across load conditions. |
| Current Limit Threshold | 95mV (typ.) at SENSE pin - sets accurate peak inductor current limit independent of temperature drift. |
| Junction Temperature Range | –40°C to +150°C - qualified for under-hood automotive and high-ambient industrial environments. |
| Package | 12-lead 4mm × 3mm DFN with exposed PGND pad - provides low thermal resistance (θJC = 5.5°C/W) for high-power density layouts. |
Pinout & Package
Package: 12-lead (4mm × 3mm) plastic DFN with exposed power ground pad (Pin 13). The exposed pad must be soldered to PCB for thermal performance and electrical connection to PGND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PGND (Pin 13) | Power Ground Reference | Primary return path for high-current gate drive and power stage; must be low-impedance copper pour connected directly to exposed pad. |
| GATE (Pin 12) | P-Channel MOSFET Gate Driver Output | Drives external high-side P-MOSFET; biased by internal VIN–VCAP LDO (8V typical) for fast turn-on/turn-off. |
| VIN (Pin 11) | Main Power Supply Input | Supplies IC core and gate driver; requires ≥0.1µF low-ESR ceramic bypass capacitor placed adjacent to pin. |
| SENSE (Pin 10) | Current Sense Input | Kelvin-connected to RSENSE between VIN and SENSE; senses differential voltage for cycle-by-cycle current limiting (95mV threshold). |
| CAP (Pin 9) | Gate Bias LDO Input | Input to internal LDO generating VIN–VCAP; requires ≥0.1µF low-ESR ceramic capacitor to VIN for stability and noise immunity. |
| RUN (Pin 8) | Enable/Shutdown Control | Digital input with 1.26V enable threshold; internal 0.4µA pull-up allows direct connection to up to 60V supply. |
| VFBN (Pin 7) | Inverting Feedback Node | Connects to center of RFB1–RFB2 divider; enables inverting configuration for negative output regulation (VOUT = –(RFB1/RFB2) × 0.8V). |
| VFB (Pin 5) | Feedback Reference Input | Regulated to 0.8V nominal; error amplifier compares (VFB – VFBN) to internal reference to control ITH and output voltage. |
| ITH (Pin 6) | Error Amplifier Output / Compensation Point | 0–2.9V analog output controlling peak current setpoint; connects to RC network for loop compensation and slope 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 Programming Input | 20µA current source sets oscillator frequency via external resistor; grounding fixes f = 350kHz, floating sets f = 535kHz. |
| PLLIN/MODE (Pin 1) | External Clock Input / Light-Load Mode Select | Accepts 75–750kHz sync clock; floating enables Burst Mode (70µA IQ), grounded selects pulse-skipping mode. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable Burst Mode Operation | Reduces quiescent current to 70µA while maintaining regulation-critical for battery-backed automotive telematics and IoT edge nodes. |
| Verified Adjacent Pin FMEA | Guaranteed fault tolerance against open/short failures between neighboring pins-enhances functional safety in ASIL-B designs. |
| Frequency Foldback Protection | Automatically reduces switching frequency to ~18% of setpoint when VFB drops below 0.4V-limits inrush and short-circuit current without external circuitry. |
| Strong Gate Driver with Integrated LDO | Delivers 8V gate bias (VIN–VCAP) with <0.5Ω pull-down resistance-ensures fast, low-loss turn-off of high-voltage P-MOSFETs. |
| Programmable Soft-Start or Output Tracking | Internal 10µA SS pull-up enables smooth startup into capacitive loads; external resistor divider allows coordinated sequencing with positive rails. |
Applications
| Automotive Infotainment Power | Industrial Sensor Signal Conditioning |
|---|---|
|
Use Scenario: Generating –5V rail for audio codec biasing and op-amp reference in head-unit systems exposed to 12V/24V battery transients. IC Role / Device Role / Timing Role: Inverting PMOS controller regulating negative output using external P-MOSFET and Schottky diode; no transformer required. Use Value: Withstands cold-crank (3.5V) and load-dump (60V) events while maintaining 70µA light-load IQ-enabling always-on audio monitoring. |
Use Scenario: Providing stable –12V supply for precision instrumentation amplifiers in factory-floor pressure/temperature transmitters. IC Role / Device Role / Timing Role: Peak current mode inverting controller with frequency foldback-limits fault current during sensor cable shorts. Use Value: –40°C to +150°C operation ensures reliability in uncooled enclosures; 95mV current sense threshold enables accurate overcurrent detection. |
| Telecom Line Card Bias | Distributed Telecom Power |
|
Use Scenario: Delivering –48V bias for analog front-end components in optical line terminals operating from 48V backplane. IC Role / Device Role / Timing Role: High-voltage inverting controller driving discrete P-MOSFET; supports >–100V outputs with proper external component selection. Use Value: Programmable 50–850kHz frequency allows EMI filtering alignment with system clock domains; PLL sync eliminates beat frequencies. |
Use Scenario: Local generation of –15V rail for FPGA I/O banks and ADC reference in modular base station radios. IC Role / Device Role / Timing Role: Constant-frequency PWM controller with soft-start and output tracking-enables synchronized power-up with +3.3V/+1.8V rails. Use Value: SS pin tracking capability ensures monotonic startup across multiple rails; exposed PGND pad simplifies thermal management in dense 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 |
|---|---|---|---|
| LTC3864HDE#TRPBF | Noninverting buck-only topology; lacks VFBN pin and inverting feedback capability; identical pinout and package. | Suitable only for positive-output step-down, not negative-output generation. | Select LTC3864HDE#TRPBF only when designing standard buck converters-cannot replace LTC3863HDE#TRPBF in inverting configurations. |
| LM5180QPWPRQ1 | 65V synchronous buck controller with integrated high-side MOSFET driver; no native inverting mode; supports 100kHz–2.2MHz frequency range. | Requires external inverting stage (e.g., charge pump or transformer) to generate negative rails; higher BOM count. | Choose LM5180QPWPRQ1 for high-efficiency positive rails where space permits added inversion stages; not drop-in for negative output. |
Compared with LTC3863HDE#TRPBF, LTC3864HDE#TRPBF omits inverting functionality but shares layout compatibility, while LM5180QPWPRQ1 offers higher integration for buck topologies but adds complexity for negative outputs-making LTC3863HDE#TRPBF uniquely suited for compact, high-reliability inverting designs.
Availability
LTC3863HDE#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial sensor transmitters, and telecom line card power supplies requiring stable component supply across extended temperature and high-voltage stress conditions.
Supply support for LTC3863HDE#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 since 1965.
The LTC3863HDE#TRPBF belongs to Analog Devices' Power by Linear™ high-voltage DC/DC controller family, designed specifically for robust, efficient negative rail generation in harsh environments where reliability, wide input range, and low IQ are critical.
FAQ
What is the maximum negative output voltage achievable with the LTC3863HDE#TRPBF?
The LTC3863HDE#TRPBF supports negative output voltages from –0.4V up to beyond –150V. The practical limit depends on external component ratings-especially the P-channel MOSFET's VDS and the Schottky catch diode's reverse voltage-and duty cycle constraints. Higher voltages require careful selection of high-voltage MOSFETs and diodes, and may reduce efficiency due to increased conduction losses. The LTC3863HDE#TRPBF itself imposes no internal ceiling on VOUT magnitude.
Does the LTC3863HDE#TRPBF support synchronization to an external clock?
Yes, the LTC3863HDE#TRPBF supports phase-lockable synchronization via the PLLIN/MODE pin. When an external clock signal (75kHz–750kHz) is applied, the internal PLL aligns the GATE turn-on edge with the rising edge of that clock. Input thresholds are 2V (high) and 0.5V (low). This feature enables EMI reduction in multi-rail systems and eliminates beat frequencies in densely packed telecom modules. The LTC3863HDE#TRPBF maintains full regulation during sync operation.
How does the frequency foldback protection work in the LTC3863HDE#TRPBF?
When the VFB pin voltage drops below 0.4V-indicating severe overload or short-circuit-the LTC3863HDE#TRPBF activates frequency foldback, linearly reducing switching frequency to ~18% of the programmed value. This limits average inductor current and power dissipation without disabling regulation. Foldback scales with the set frequency, ensuring consistent protection across all operating points. The LTC3863HDE#TRPBF resumes normal frequency once VFB rises above 0.4V.
Can the LTC3863HDE#TRPBF be used in noninverting buck configuration?
Yes, the LTC3863HDE#TRPBF can be configured as a noninverting buck controller by pulling the VFBN pin above 2V (but below 5V), which disables the internal inverting amplifier. In this mode, feedback is taken directly to VFB (vs. VFBN), and the output becomes VOUT = ((RFB1 + RFB2)/RFB2) × 0.8V. All other functions-including Burst Mode, soft-start, and frequency programming-remain fully operational. The LTC3863HDE#TRPBF retains identical pinout and package in both configurations.
What is the thermal performance difference between the MSOP and DFN packages for the LTC3863HDE#TRPBF?
The LTC3863HDE#TRPBF in the 4mm × 3mm DFN package (HDE grade) has θJC = 5.5°C/W and θJA = 43°C/W, while the MSOP variant has θJC = 10°C/W and θJA = 40°C/W. The DFN's lower junction-to-case resistance makes it superior for high-power-density layouts where heat must be conducted through the exposed PGND pad to internal copper layers. The MSOP offers slightly better junction-to-ambient in still-air bench testing, but the DFN delivers more predictable thermal performance in production PCBs with thermal vias. Both packages support the same –40°C to +150°C junction rating.
LTC3863HDE#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 ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-DFN (4x3)
LTC3863HDE#TRPBF FAQ
1.How can I place an order for LTC3863HDE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3863HDE#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 LTC3863HDE#TRPBF reliable?
The price and inventory of LTC3863HDE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3863HDE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3863HDE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3863HDE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3863HDE#TRPBF?
LTC3863HDE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3863HDE#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 LTC3863HDE#TRPBF?
For technical support, including LTC3863HDE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3863HDE#TRPBF requirements.
6.How does Aetrix verify that LTC3863HDE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3863HDE#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 LTC3863HDE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3863HDE#TRPBF?
All LTC3863HDE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3863HDE#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 LTC3863HDE#TRPBF part is unused and in its original packaging.
Return procedure for LTC3863HDE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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