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Analog Devices Inc. LTC3863IMSE#TRPBF
- Part No.:
- LTC3863IMSE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 12-TSSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3863IMSE#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 12MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,695
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Product details
Overview
LTC3863IMSE#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 integrated gate driver with 8V (VIN–VCAP) bias regulation.
For engineers reviewing the LTC3863IMSE#TRPBF datasheet, LTC3863IMSE#TRPBF pinout, LTC3863IMSE#TRPBF application, or LTC3863IMSE#TRPBF equivalent, this page delivers verified technical context, package-validated pin functions, real-world operating limits (3.5V–60V input, –0.4V––150V output), light-load efficiency behavior, and precise alternative selection guidance for negative-buck designs.
Technical Context
The LTC3863IMSE#TRPBF implements peak current mode control with slope compensation, using an internal transconductance error amplifier (1.8mS) and a voltage-controlled oscillator whose frequency is set via FREQ pin current (20µA) or external resistor. Its inverting architecture relies on dual feedback inputs (VFB and VFBN) to regulate negative outputs with 0.8V reference accuracy and ±0.015% load regulation.
Safety logic includes overvoltage lockout (10% VFB threshold), frequency foldback triggered below 0.4V on VFB (down to 18% of set frequency), and UVLO with 3.25V hysteresis on VIN–VCAP. The controller supports both Burst Mode (70µA IQ) and pulse-skipping operation, selectable via PLLIN/MODE pin state, and provides phase-lockable synchronization from 75kHz to 750kHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5V to 60V - supports wide automotive battery transients and industrial rail variations without external pre-regulation. |
| Negative Output Range | –0.4V to –150V - enables high-ratio inverting conversion using standard external components; limited only by MOSFET voltage rating and diode selection. |
| Quiescent Current | 70µA in Burst Mode - ensures ultra-low standby power for always-on systems such as automotive infotainment or remote sensors. |
| Switching Frequency | 50kHz to 850kHz (programmable) - allows optimization of size (higher f) vs. efficiency (lower f) and EMI filtering requirements. |
| Gate Driver Bias | VIN–VCAP = 8V (regulated) - provides strong turn-on drive for high-voltage P-MOSFETs while maintaining low dropout under varying input conditions. |
| Current Limit Threshold | 95mV (typical) across RSENSE - delivers accurate, temperature-stable peak current limiting independent of input voltage. |
| Feedback Reference | 0.800V ±1% - enables precise output regulation with minimal drift over temperature and line/load conditions. |
Pinout & Package
Package: 12-lead plastic MSOP (4mm × 3mm) with exposed PGND pad (Pin 13), rated for –40°C to 125°C junction temperature. Thermal resistance θJA = 40°C/W; exposed pad must be soldered to PCB for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PGND (Pin 13) | Power Ground Reference | Primary return path for high-current MOSFET switching and catch diode; must be connected directly to PCB ground plane with low-inductance layout. |
| GATE (Pin 12) | P-Channel MOSFET Gate Driver Output | Drives external high-side P-MOSFET; output swing referenced to VIN; requires stable CAP bypass for robust gate charging. |
| VIN (Pin 11) | Main Power Supply Input | Supplies internal circuitry and gate driver LDO; minimum 0.1µF ceramic bypass required adjacent to pin. |
| SENSE (Pin 10) | Current Sense Input | Kelvin-connected to sense resistor (RSENSE) between VIN and SENSE; sets peak inductor current limit at 95mV/RSENSE. |
| CAP (Pin 9) | Gate Driver Bias Supply | Output of internal LDO regulating VIN–VCAP to 8V; 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 and 150mV hysteresis; 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 for negative-output sensing; 0V threshold enables inverting amplifier; >2V disables inversion. |
| VFB (Pin 5) | Feedback Reference Input | Regulated to 0.800V; used with VFBN to set output voltage as –(RFB1/RFB2)×0.8V; folds back frequency if <0.4V. |
| ITH (Pin 6) | Error Amplifier Output / Compensation | Controller compensation node (0–2.9V range); connects to RC network for loop stability; sets peak current threshold with slope compensation. |
| 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 set oscillator frequency from 50kHz–850kHz; ground = 350kHz, open = 535kHz. |
| PLLIN/MODE (Pin 1) | Clock Sync Input / Light-Load Mode Select | Accepts 75–750kHz external clock for phase alignment; floating = Burst Mode (70µA IQ), grounded = pulse-skipping mode. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable Burst Mode | Reduces no-load IQ to 70µA while maintaining regulation-critical for battery-backed or energy-harvesting systems requiring multi-year standby life. |
| Verified FMEA for Adjacent Pin Faults | Guaranteed safe operation under open/short faults between neighboring pins-meets ASIL-B functional safety requirements for automotive power rails. |
| Frequency Foldback Protection | Automatically scales switching frequency down to 18% of set value when VFB drops below 0.4V-limits inrush and short-circuit current without external circuitry. |
| Strong High-Voltage Gate Drive | Delivers 8V gate bias (VIN–VCAP) with 0.9Ω pull-down and 2Ω pull-up-ensures fast, robust turn-on/turn-off of 60V+ P-MOSFETs even at cold temperatures. |
| Accurate Current Limit | 95mV ±8mV sense threshold with <±0.1%/°C drift-enables repeatable, temperature-stable overcurrent protection across full operating range. |
| Programmable Soft-Start or Tracking | Single SS pin supports either capacitor-based soft-start (10µA ramp) or external voltage tracking-eliminates need for auxiliary sequencing ICs in multi-rail systems. |
Applications
| Automotive Infotainment Power | Industrial Sensor Signal Conditioning |
|---|---|
|
Use Scenario: Generating –5V rail for analog front-end op-amps and ADCs in vehicle-mounted radar modules. IC Role / Device Role / Timing Role: Inverting controller providing isolated negative bias for precision signal chain components. Use Value: Enables single-supply microcontroller to interface with bipolar analog sensors while maintaining <1% output regulation over 12V–16V battery variation. |
Use Scenario: Powering –12V op-amp stages in factory-floor vibration monitoring nodes with 24V DC input. IC Role / Device Role / Timing Role: High-efficiency negative buck controller delivering stable bias for instrumentation amplifiers. Use Value: Achieves 92% efficiency at 1A load and draws only 70µA in sleep mode-extending battery life in wireless sensor deployments. |
| Telecom Line Card Bias | Distributed Power for FPGA I/O Banks |
|
Use Scenario: Providing –3.3V for RS-485 transceivers and analog line drivers in central office equipment. IC Role / Device Role / Timing Role: Inverting DC/DC controller supporting hot-swap and transient-tolerant operation on 48V telecom bus. Use Value: Withstands 60V input surges and maintains regulation during 48V brownouts down to 3.5V-ensuring uninterrupted serial communication. |
Use Scenario: Generating –1.8V for LVDS I/O termination in high-speed FPGA-based test equipment. IC Role / Device Role / Timing Role: Precision negative regulator synchronized to system clock via PLLIN/MODE pin. Use Value: Phase-locked operation at 350kHz eliminates beat frequencies with other system clocks-reducing jitter in high-speed data acquisition. |
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 |
|---|---|---|---|
| LTC3864IMSE#TRPBF | Non-inverting buck-only architecture; lacks VFBN pin and inverting feedback capability; identical pinout and package. | Requires positive-output configurations only; cannot generate negative voltages without external inverter stage. | Select when designing positive-buck supplies and seeking footprint compatibility; not suitable for native negative-rail generation. |
| LM5160QPWPRQ1 | 65V synchronous buck controller with integrated high-side MOSFET driver; no native inverting support; uses different compensation scheme. | Designed for isolated flyback or buck-boost topologies with external transformer; higher BOM count for negative output. | Choose for cost-sensitive automotive applications needing AEC-Q100 qualification and integrated drivers-but requires redesign for inverting function. |
Compared with LTC3863IMSE#TRPBF, LTC3864IMSE#TRPBF offers pin-compatible replacement for positive-rail designs but removes inverting capability entirely, while LM5160QPWPRQ1 provides automotive-grade integration at the expense of native negative-output support and increased design complexity for inverting use cases.
Availability
LTC3863IMSE#TRPBF 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 (–40°C to 125°C), and long-term lifecycle continuity.
Supply support for LTC3863IMSE#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 industrial, automotive, communications, and healthcare markets with precision power, signal chain, and RF solutions.
The LTC3863IMSE#TRPBF belongs to Analog Devices' Power by Linear™ portfolio of high-reliability DC/DC controllers, engineered specifically for demanding negative-output power conversion in harsh environments where input transients, wide temperature ranges, and low quiescent current are critical.
FAQ
What is the maximum negative output voltage achievable with the LTC3863IMSE#TRPBF?
The LTC3863IMSE#TRPBF supports negative output voltages from –0.4V up to beyond –150V, limited only by external component ratings-particularly the voltage rating of the P-channel MOSFET and catch diode. In practice, –48V and –60V outputs are commonly implemented in telecom and industrial systems using standard 100V+ MOSFETs and Schottky diodes. The controller itself imposes no hard upper bound beyond its 60V input rating and internal gate driver constraints.
How does the LTC3863IMSE#TRPBF achieve 70µA quiescent current in Burst Mode?
The LTC3863IMSE#TRPBF achieves 70µA quiescent current in Burst Mode by disconnecting the error amplifier output from the ITH pin and disabling most internal circuitry-including the oscillator, gate driver, and current comparator-when the ITH voltage falls below 0.425V. During sleep, only a minimal bias current remains active to monitor VFB. The device wakes synchronously on the next oscillator cycle once output droop lowers VFB sufficiently to reactivate regulation. This behavior is confirmed in the Electrical Characteristics table (IQ = 50µA–70µA, Burst Mode).
Can the LTC3863IMSE#TRPBF be used in non-inverting buck configurations?
Yes, the LTC3863IMSE#TRPBF 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 compared directly to the 0.8V internal reference, and the feedback divider connects from VOUT to VFB to SGND. This configuration is explicitly documented in the "OPERATION" section (page 10) and Functional Diagram (page 9) of the datasheet, enabling reuse of the same controller for both negative and positive output topologies.
What thermal considerations apply to the exposed pad (Pin 13) of the LTC3863IMSE#TRPBF?
The exposed pad (Pin 13, PGND) of the LTC3863IMSE#TRPBF must be soldered to a PCB copper area for both electrical grounding and thermal dissipation. With θJA = 40°C/W and TJMAX = 150°C, proper pad connection reduces thermal resistance significantly-failure to solder the pad degrades θJA by >25°C/W and risks thermal shutdown under moderate load. The datasheet mandates that the pad be connected to the main power ground plane using multiple thermal vias to inner layers, and specifies that it is electrically tied to PGND, not SGND.
Does the LTC3863IMSE#TRPBF support synchronization to an external clock, and what are the valid frequency and voltage ranges?
Yes, the LTC3863IMSE#TRPBF supports external clock synchronization via the PLLIN/MODE pin across 75kHz to 750kHz. Clock input must meet VIH ≥ 2V and VIL ≤ 0.5V, with guaranteed lock time and jitter performance within this band. The PLL aligns the GATE turn-on edge to the rising edge of the external clock, enabling deterministic timing in multi-converter systems. This capability is validated in the Absolute Maximum Ratings and Typical Performance Characteristics (Figures G19–G20) of the datasheet.
LTC3863IMSE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 12-TSSOP (0.118", 3.00mm Width) 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-MSOP-EP
LTC3863IMSE#TRPBF FAQ
1.How can I place an order for LTC3863IMSE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3863IMSE#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 LTC3863IMSE#TRPBF reliable?
The price and inventory of LTC3863IMSE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3863IMSE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3863IMSE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3863IMSE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3863IMSE#TRPBF?
LTC3863IMSE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3863IMSE#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 LTC3863IMSE#TRPBF?
For technical support, including LTC3863IMSE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3863IMSE#TRPBF requirements.
6.How does Aetrix verify that LTC3863IMSE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3863IMSE#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 LTC3863IMSE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3863IMSE#TRPBF?
All LTC3863IMSE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3863IMSE#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 LTC3863IMSE#TRPBF part is unused and in its original packaging.
Return procedure for LTC3863IMSE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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