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Analog Devices Inc. LTC3863MPMSE#TRPBF
- Part No.:
- LTC3863MPMSE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 12-TSSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3863MPMSE#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 12MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,549
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Product details
Overview
LTC3863MPMSE#TRPBF from Analog Devices is a high-voltage, low-quiescent-current inverting 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 from 3.5V to 60V input, draws only 70µA in Burst Mode, and supports programmable switching frequency from 50kHz to 850kHz - enabling compact, efficient designs for harsh-environment power systems.
For engineers reviewing the LTC3863MPMSE#TRPBF datasheet, LTC3863MPMSE#TRPBF pinout, LTC3863MPMSE#TRPBF application, or LTC3863MPMSE#TRPBF equivalent, key selection considerations include its –55°C to 150°C operating junction temperature range, verified adjacent-pin FMEA, peak current mode control with accurate 95mV current limit threshold, and dual-mode light-load operation (Burst Mode or pulse-skipping) for automotive infotainment, telecom bias supplies, and industrial sensor interfaces.
Technical Context
The LTC3863MPMSE#TRPBF implements a nonsynchronous, peak current mode, constant-frequency PWM architecture with an internal transconductance error amplifier (1.8mS), slope compensation, and a dedicated inverting feedback path (VFBN/VFB) for stable regulation of negative output voltages. Its gate driver delivers strong pull-up (2Ω) and pull-down (0.9Ω) capability to drive high-voltage PMOS devices efficiently.
It integrates programmable soft-start/tracking via the SS pin (10µA internal charge current), frequency foldback protection triggered below 0.4V on VFB, and robust fault handling including overvoltage lockout (10% above 0.8V reference) and UVLO with 3.25V/3.5V hysteresis. The device supports PLL synchronization (75–750kHz) and offers selectable operating modes via the PLLIN/MODE pin.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5V to 60V - supports wide-range automotive battery and industrial bus inputs without pre-regulation. |
| Negative Output Range | –0.4V to beyond –150V - enables high-ratio inverting conversion using standard external components. |
| Quiescent Current (Burst Mode) | 70µA - sustains ultra-low standby power in always-on automotive modules and remote sensors. |
| Switching Frequency Range | 50kHz to 850kHz - allows optimization of size (higher f) vs. efficiency (lower f) across diverse load conditions. |
| Current Limit Threshold | 95mV (typical) across RSENSE - provides precise, temperature-stable peak current limiting independent of VIN. |
| Operating Junction Temp | –55°C to 150°C - fully tested and guaranteed for extended-temperature automotive and downhole applications. |
| Feedback Reference Voltage | 0.800V ±0.009V - ensures tight output regulation accuracy across temperature and line variations. |
Pinout & Package
Package: 12-lead plastic MSOP with exposed PGND pad (Pin 13), thermally enhanced for high-power density operation in constrained layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PGND (Pin 13) | Power Ground Reference | Exposed thermal pad; must be soldered to PCB for rated θJC = 10°C/W and safe operation at full load. |
| GATE (Pin 12) | P-Channel MOSFET Driver Output | High-current gate drive with 2Ω pull-up / 0.9Ω pull-down; regulates VIN–VCAP to 8V for optimal PMOS turn-on. |
| VIN (Pin 11) | Main Power Supply Input | Supplies internal circuitry and gate driver LDO; requires ≥0.1µF ceramic bypass to PGND. |
| SENSE (Pin 10) | Current Sense Input | Differential input for RSENSE; sets peak inductor current limit as 95mV/RSENSE with Kelvin connection required. |
| CAP (Pin 9) | Gate Driver Bias Supply | Internal LDO output referenced to VIN; requires ≥0.1µF low-ESR ceramic capacitor to VIN for stability. |
| RUN (Pin 8) | Enable/Shutdown Control | Logic-compatible input with 1.26V enable threshold and 150mV hysteresis; internal 0.4µA pull-up. |
| VFBN (Pin 7) | Inverting Feedback Node | Connects center of RFB1/RFB2 divider; enables true inverting topology with 0V threshold and 800mV reference. |
| VFB (Pin 5) | Feedback Reference Input | Regulated to 0.800V; output voltage set by (RFB1/RFB2) × 0.8V in inverting configuration. |
| ITH (Pin 6) | Error Amplifier Output & Compensation | 0–2.9V control node; connects to RC network for loop stability; minimum RITH = 10kΩ required. |
| SS (Pin 4) | Soft-Start / Tracking Input | Internal 10µA current source charges external CSS; regulates VFB to min(0.8V, VSS) for controlled ramp-up. |
| FREQ (Pin 2) | Frequency Setpoint Input | 20µA current source sets oscillator frequency via RFREQ; ground = 350kHz, open = 535kHz, resistor = 50–850kHz. |
| PLLIN/MODE (Pin 1) | Sync Clock Input / Light-Load Mode Select | Floating = Burst Mode (70µA IQ); grounded = pulse-skipping; external clock = PLL sync (75–750kHz). |
Key Features
| Feature | Design Value |
|---|---|
| Extended Temperature Grade | –55°C to 150°C junction range - fully tested and qualified for under-hood automotive and aerospace applications. |
| Verified Adjacent Pin FMEA | Robustness confirmed against open/short faults between neighboring pins - critical for safety-critical power domains. |
| Programmable Frequency Foldback | Reduces switching frequency to ~18% of setpoint when VFB < 0.4V - limits inrush and short-circuit current without external circuitry. |
| Strong PMOS Gate Drive | 2Ω pull-up / 0.9Ω pull-down with 8V gate bias - ensures fast, low-loss switching of high-voltage P-channel MOSFETs. |
| Accurate Inverting Feedback Architecture | 0.800V reference with 0.009V tolerance and <±0.1% load/line regulation - enables precision negative rail generation. |
| Low Shutdown IQ | 7µA shutdown current - preserves battery life in parked-vehicle systems and energy-harvesting nodes. |
Applications
| Automotive Infotainment Power | Industrial Sensor Bias Supply |
|---|---|
Use Scenario: Generating –5V or –12V rails for analog audio codecs, ADCs, and op-amps in head units and ADAS ECUs. IC Role / Device Role / Timing Role: Inverting DC/DC controller regulating negative output using external PMOS and Schottky diode. Use Value: Enables single-supply microcontroller systems to power bipolar analog stages without isolated converters or extra transformers. |
Use Scenario: Providing stable –15V bias for piezoelectric transducers and MEMS pressure sensors in factory automation equipment. IC Role / Device Role / Timing Role: High-voltage inverting controller delivering precise negative voltage with low ripple and excellent line/load regulation. Use Value: Maintains sensor signal integrity across wide input voltage swings (9–16V automotive) and extreme ambient temperatures (–40°C to +125°C). |
| Telecom Line Card Bias | Distributed Power System Negative Rail |
Use Scenario: Creating –48V intermediate bus for legacy telecom interface circuits in base station line cards. IC Role / Device Role / Timing Role: Programmable-frequency inverting controller driving high-side PMOS with synchronized clock input. Use Value: Supports phase-aligned switching across multiple rails to reduce EMI in dense backplane environments. |
Use Scenario: Local generation of –3.3V or –5V for FPGA I/O banks and analog front-ends in modular server PSUs. IC Role / Device Role / Timing Role: Compact, thermally robust controller in 12-lead MSOP package minimizing board area in multi-rail power trees. Use Value: Delivers 1.7A at –5V with 350kHz switching and <1% output deviation - simplifies system-level compliance testing. |
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 |
|---|---|---|---|
| LTC3864MPMSE#TRPBF | Noninverting buck-only topology; lacks VFBN pin and inverting feedback path; identical temp grade and package. | Suitable only for positive-output step-down, not negative rail generation. | Select only when designing positive-output converters requiring same ruggedness and temperature range. |
| LM5180QPWPRQ1 | Automotive-grade flyback controller; supports isolated negative outputs but requires transformer; higher IQ (100µA) and no Burst Mode. | Used where galvanic isolation or multiple outputs are mandatory; not a direct functional replacement. | Choose for isolated bias supplies where safety standards require creepage/clearance; not for nonisolated inverting topologies. |
Compared with LTC3863MPMSE#TRPBF, LTC3864MPMSE#TRPBF omits inverting capability entirely, while LM5180QPWPRQ1 adds isolation complexity and sacrifices light-load efficiency - making LTC3863MPMSE#TRPBF uniquely suited for high-reliability, nonisolated negative rail generation.
Availability
LTC3863MPMSE#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial sensor interfaces, telecom line card biasing, and distributed power system negative rails requiring stable component supply across extended temperature ranges.
Supply support for LTC3863MPMSE#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 industrial, automotive, communications, and healthcare markets with precision power, signal chain, and RF solutions.
The LTC3863 belongs to Analog Devices' high-voltage DC/DC controller product line, designed specifically for robust, high-efficiency negative and positive rail generation in demanding automotive and industrial environments.
FAQ
What is the guaranteed operating temperature range for the LTC3863MPMSE#TRPBF?
The LTC3863MPMSE#TRPBF is fully tested and guaranteed over a junction temperature range of –55°C to 150°C. This extended grade exceeds standard automotive AEC-Q100 Grade 1 requirements and supports deployment in engine bay, transmission control, and downhole instrumentation applications where ambient extremes demand rigorous qualification.
How does the LTC3863MPMSE#TRPBF achieve inverting operation without an inductor center-tap or transformer?
The LTC3863MPMSE#TRPBF uses a dedicated inverting feedback architecture with VFBN and VFB pins. By connecting a resistor divider between VOUT and VFB through VFBN, it senses the negative output relative to ground and regulates VFB to 0.8V - resulting in VOUT = –(RFB1/RFB2) × 0.8V. This eliminates need for magnetic center-taps or isolation.
Can the LTC3863MPMSE#TRPBF synchronize to an external clock, and what are the valid frequency and voltage levels?
Yes, the LTC3863MPMSE#TRPBF supports PLL synchronization via the PLLIN/MODE pin across 75kHz to 750kHz. Valid input levels require VIH ≥ 2V and VIL ≤ 0.5V, with rise/fall times compatible with standard CMOS or LVDS clocks. Synchronization aligns the GATE turn-on edge to the external clock's rising edge.
What protection features are integrated into the LTC3863MPMSE#TRPBF?
The LTC3863MPMSE#TRPBF integrates overvoltage lockout (triggers at +10% of 0.8V reference), cycle-by-cycle current limiting (95mV threshold), frequency foldback during overload (down to 18% of set frequency), undervoltage lockout (3.25V/3.5V hysteresis), and thermal shutdown. All are fully operational across the –55°C to 150°C range.
Is the LTC3863MPMSE#TRPBF pin-compatible with other variants in the LTC3863 family?
Yes, all LTC3863 variants - including LTC3863EMSE#TRPBF, LTC3863IMSE#TRPBF, LTC3863HMSE#TRPBF, and LTC3863MPMSE#TRPBF - share identical 12-lead MSOP pinouts and electrical functionality. Only the guaranteed temperature range and test coverage differ; no PCB redesign is needed when upgrading to the MP grade.
LTC3863MPMSE#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:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-MSOP-EP
LTC3863MPMSE#TRPBF FAQ
1.How can I place an order for LTC3863MPMSE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3863MPMSE#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 LTC3863MPMSE#TRPBF reliable?
The price and inventory of LTC3863MPMSE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3863MPMSE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3863MPMSE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3863MPMSE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3863MPMSE#TRPBF?
LTC3863MPMSE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3863MPMSE#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 LTC3863MPMSE#TRPBF?
For technical support, including LTC3863MPMSE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3863MPMSE#TRPBF requirements.
6.How does Aetrix verify that LTC3863MPMSE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3863MPMSE#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 LTC3863MPMSE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3863MPMSE#TRPBF?
All LTC3863MPMSE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3863MPMSE#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 LTC3863MPMSE#TRPBF part is unused and in its original packaging.
Return procedure for LTC3863MPMSE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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