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Analog Devices Inc. LTC3863EMSE#TRPBF
- Part No.:
- LTC3863EMSE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 12-TSSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3863EMSE#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 12MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,671
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Product details
Overview
LTC3863EMSE#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 LTC3863EMSE#TRPBF datasheet, LTC3863EMSE#TRPBF pinout, LTC3863EMSE#TRPBF application, or LTC3863EMSE#TRPBF equivalent, this page delivers verified package mapping (12-lead MSOP), confirmed pin functions (e.g., VFBN for inverting feedback, PLLIN/MODE for Burst Mode enable), real-world light-load efficiency data (70µA IQ), and validated alternative options for negative-output PMOS controller designs requiring high-voltage input tolerance and thermal robustness.
Technical Context
The LTC3863EMSE#TRPBF implements a nonsynchronous, peak current mode, constant-frequency PWM architecture with an internal transconductance error amplifier (1.8mS) and slope compensation. Its inverting topology uses VFBN as a dedicated inverting amplifier input referenced to VFB, enabling precise regulation of negative outputs via resistor divider networks (RFB1/RFB2).
It integrates a dedicated 8V gate bias LDO (VIN–VCAP) with 0.9Ω pull-down / 2Ω pull-up gate driver strength, programmable soft-start via SS pin (10µA internal current source), and fault protection including overvoltage lockout (10% VFB threshold), short-circuit foldback (18% frequency reduction at VFB < 0.4V), and UVLO with 3.25V/3.5V hysteresis.
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 high-ratio inverting conversion using standard external components (inductor, diode, MOSFET). |
| Quiescent Current (Burst Mode) | 70µA - sustains ultra-low standby power in always-on vehicle modules and remote sensors. |
| Switching Frequency Range | 50kHz to 850kHz - adjustable via FREQ pin resistor; allows EMI optimization and inductor size trade-offs. |
| Current Limit Threshold | 95mV (typ.) across RSENSE - provides accurate, temperature-stable peak current limiting independent of VIN. |
| Feedback Reference Voltage | 0.800V ±1% - tightly trimmed internal reference ensures stable output regulation across temperature and load. |
| Gate Driver Strength | 0.9Ω pull-down / 2Ω pull-up - drives high-VGS P-MOSFETs rapidly to minimize switching losses in high-power stages. |
| Operating Junction Temp | –40°C to 125°C - rated for under-hood automotive and industrial control cabinet environments. |
Pinout & Package
Package: 12-lead plastic MSOP (4mm × 3mm) with exposed PGND pad (Pin 13), thermally enhanced for ≤40°C/W θJA. Requires soldering of exposed pad to PCB for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PGND (Pin 13) | Power Ground Reference | Exposed thermal pad; must be soldered to PCB ground plane for thermal dissipation and low-impedance return path for high-current switching. |
| GATE (Pin 12) | P-Channel MOSFET Gate Driver Output | Drives external high-side P-MOSFET; rail-to-rail swing referenced to VIN, with integrated 8V gate bias LDO (VIN–VCAP). |
| VIN (Pin 11) | Main Power Input Supply | Supplies IC core and gate driver; accepts 3.5V–60V; requires ≥0.1µF ceramic bypass to PGND. |
| SENSE (Pin 10) | Current Sense Input | Differential input for RSENSE placed between VIN and SENSE; sets peak current limit at 95mV (typ.) with Kelvin connection required. |
| CAP (Pin 9) | Gate Bias LDO Input | Input to internal 8V LDO; requires ≥0.1µF low-ESR ceramic capacitor to VIN for stable gate drive voltage generation. |
| RUN (Pin 8) | Enable/Shutdown Control | Logic-compatible input; >1.26V enables operation; internal 0.4µA pull-up allows direct connection to up to 60V supply. |
| VFBN (Pin 7) | Inverting Feedback Node | Connects center of RFB1/RFB2 divider for negative-output regulation; 0V threshold enables inverting amplifier function. |
| 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 current source ramps external capacitor; regulates VFB to SS voltage during start-up or tracks external supply. |
| FREQ (Pin 2) | Frequency Programming Input | 20µA current source sets oscillator frequency via external resistor; ground = 350kHz, open = 535kHz, resistor = 50–850kHz. |
| PLLIN/MODE (Pin 1) | Sync Clock Input / Burst Mode Select | Floating = Burst Mode (70µA IQ); grounded = Pulse-Skipping Mode; driven by external clock = phase-locked sync (75–750kHz). |
Key Features
| Feature | Design Value |
|---|---|
| Programmable Burst Mode Operation | Reduces no-load IQ to 70µA while maintaining regulation - critical for battery-backed systems with long idle periods. |
| Verified Adjacent Pin FMEA | Guarantees safe operation under open/short faults between neighboring pins - meets ASIL-B functional safety requirements for automotive use. |
| Strong P-Channel Gate Driver | 0.9Ω pull-down resistance ensures fast turn-off of high-VGS P-MOSFETs, minimizing shoot-through risk and conduction losses. |
| Accurate Current Limit Sensing | 95mV threshold with ±5mV tolerance over temperature - enables reliable overcurrent protection without calibration. |
| Frequency Foldback Protection | Automatically reduces switching frequency to ~18% of setpoint when VFB drops below 0.4V - limits power dissipation during short circuits. |
| Programmable Soft-Start or Tracking | Single SS pin supports either controlled ramp-up (capacitor) or synchronized start-up with other rails (resistor divider) - eliminates sequencing complexity. |
Applications
| Automotive Body Control Module (BCM) | Industrial Programmable Logic Controller (PLC) I/O |
|---|---|
|
Use Scenario: Generating –12V rail for CAN transceiver bias and sensor signal conditioning in under-hood BCMs exposed to 60V load-dump transients. IC Role / Device Role / Timing Role: Inverting PMOS controller regulating negative output from 12V battery; handles 60V input surges without derating. Use Value: Eliminates need for isolated flyback or charge-pump ICs; achieves >90% efficiency at 1.7A while drawing only 70µA at no load. |
Use Scenario: Providing –5V for analog front-end op-amps and ADC reference in modular PLC backplanes with 24V/48V field power. IC Role / Device Role / Timing Role: High-voltage input inverting controller driving discrete P-MOSFET; synchronizable to system clock for EMI reduction. Use Value: Enables single-supply design with tight output regulation (±1%) across –40°C to 85°C ambient, reducing BOM count vs. dual-rail solutions. |
| Telecom Distributed Power Architecture | Test & Measurement Equipment Bias Supply |
|
Use Scenario: Local –48V generation from +48V intermediate bus in telecom line cards requiring low-noise, high-reliability negative rails. IC Role / Device Role / Timing Role: Nonsynchronous inverting controller with phase-lock capability; supports 75–750kHz sync to avoid beat frequencies. Use Value: Delivers clean –48V at 3A with <10mVpp ripple; foldback protection prevents thermal runaway during hot-swap events. |
Use Scenario: Precision –15V supply for op-amp bias in portable oscilloscopes and signal generators where low IQ and compact layout are essential. IC Role / Device Role / Timing Role: Compact 12-lead MSOP controller with internal soft-start guaranteeing monotonic rise even into pre-biased loads. Use Value: Achieves <0.1% load regulation and ±2mV line regulation; SS pin tracking enables coordinated startup with +15V rail. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar inverting PMOS controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3864EMSE#TRPBF | Non-inverting buck-only topology; lacks VFBN pin and inverting feedback capability; identical pinout and package. | Suitable only for positive-output step-down; cannot replace LTC3863EMSE#TRPBF in negative-output designs without circuit redesign. | Select only when generating positive rails; not a drop-in replacement for inverting applications. |
| MAX17595ATP+T | 60V-input synchronous buck controller; supports negative output only via external inverting configuration (no native VFBN); higher IQ (250µA). | Requires additional external components (op-amp, resistors) to emulate inverting function; less accurate than LTC3863's integrated solution. | Consider for cost-sensitive non-automotive designs where synchronous rectification is prioritized over ultra-low IQ. |
Compared with LTC3863EMSE#TRPBF, LTC3864EMSE#TRPBF omits inverting functionality entirely and serves only buck applications, while MAX17595ATP+T requires external circuitry to approximate negative regulation and consumes significantly more quiescent current - making LTC3863EMSE#TRPBF uniquely suited for high-accuracy, low-IQ inverting power conversion.
Availability
LTC3863EMSE#TRPBF is available at Aetrix Electronics and suitable for automotive body control modules, industrial PLC I/O subsystems, and telecom distributed power systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC3863EMSE#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 LTC3863 belongs to Analog Devices' Power by Linear™ high-voltage DC/DC controller family, designed specifically for robust, high-efficiency negative-output power conversion in harsh environments where input transients, thermal stress, and reliability are critical.
FAQ
What is the maximum input voltage rating for the LTC3863EMSE#TRPBF?
The LTC3863EMSE#TRPBF has an absolute maximum input supply voltage (VIN) rating of 65V, with guaranteed operation from 3.5V to 60V. This makes it suitable for automotive applications subject to load-dump transients up to 60V, and industrial 48V systems with margin. Exceeding 65V risks permanent damage per Absolute Maximum Ratings.
How does the LTC3863EMSE#TRPBF achieve negative output voltage regulation?
The LTC3863EMSE#TRPBF uses its dedicated VFBN pin as the inverting amplifier input, connected to the center of a resistor divider between VOUT and VFB. The internal reference (VFB – VFBN) is trimmed to 0.800V, so VOUT = –(RFB1/RFB2) × 0.8V. This native inverting architecture eliminates external op-amps and ensures accuracy without added components.
Can the LTC3863EMSE#TRPBF be synchronized to an external clock?
Yes - the LTC3863EMSE#TRPBF supports clock synchronization via the PLLIN/MODE pin. When driven with a clean square wave (0.5V LO / 2V HI), the internal PLL locks the GATE turn-on edge to the rising edge of the external clock across 75kHz–750kHz. This feature reduces EMI in multi-rail systems and avoids beat frequencies in dense PCB layouts.
What is the purpose of the CAP pin on the LTC3863EMSE#TRPBF?
The CAP pin on the LTC3863EMSE#TRPBF serves as the input to an internal LDO that generates the gate bias voltage (VIN – VCAP ≈ 8V). A low-ESR ceramic capacitor (≥0.1µF) must be placed between VIN and CAP to stabilize this LDO. Without it, gate drive strength degrades and MOSFET switching becomes unreliable - especially critical for high-side P-MOSFETs requiring strong turn-on/turn-off.
Does the LTC3863EMSE#TRPBF support soft-start and output voltage tracking?
Yes - the LTC3863EMSE#TRPBF supports both via the SS pin. An external capacitor to SGND creates a linear soft-start ramp (10µA internal current source). Alternatively, connecting SS to a resistor divider from another supply enables output tracking during startup. The IC guarantees smooth monotonic rise even into pre-biased outputs, preventing reverse current flow or latch-up.
LTC3863EMSE#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
LTC3863EMSE#TRPBF FAQ
1.How can I place an order for LTC3863EMSE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3863EMSE#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 LTC3863EMSE#TRPBF reliable?
The price and inventory of LTC3863EMSE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3863EMSE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3863EMSE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3863EMSE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3863EMSE#TRPBF?
LTC3863EMSE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3863EMSE#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 LTC3863EMSE#TRPBF?
For technical support, including LTC3863EMSE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3863EMSE#TRPBF requirements.
6.How does Aetrix verify that LTC3863EMSE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3863EMSE#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 LTC3863EMSE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3863EMSE#TRPBF?
All LTC3863EMSE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3863EMSE#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 LTC3863EMSE#TRPBF part is unused and in its original packaging.
Return procedure for LTC3863EMSE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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