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Analog Devices Inc. LTC3863EMSE#PBF
- Part No.:
- LTC3863EMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 12-TSSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3863EMSE#PBF.pdf
- Description:
- IC REG CTRLR BUCK 12MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:305
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Product details
Overview
LTC3863EMSE#PBF from Analog Devices is a 60V-input, inverting PMOS DC/DC controller optimized for automotive and industrial negative voltage generation. It drives external P-channel MOSFETs to produce regulated negative outputs 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 power supplies requiring high-voltage negative rails.
For engineers reviewing the LTC3863EMSE#PBF datasheet, LTC3863EMSE#PBF pinout, LTC3863EMSE#PBF application, or LTC3863EMSE#PBF equivalent, key selection considerations include its 12-lead MSOP package with exposed PGND pad, inverting topology compatibility with Schottky catch diodes, programmable soft-start/tracking capability, and verified adjacent-pin FMEA robustness for harsh environments.
Technical Context
The LTC3863EMSE#PBF implements a nonsynchronous inverting peak current mode architecture with an internal transconductance error amplifier (1.8mS) and slope compensation. Its feedback loop uses VFBN/VFB differential sensing to regulate negative output voltages, where VREG = VFB – VFBN is trimmed to 0.800V ±9mV across temperature.
It integrates a dedicated 8V gate bias LDO (VIN–VCAP) with 0.5V dropout at 15mA, programmable frequency via 20µA FREQ pin current source, and dual light-load modes: Burst Mode (70µA IQ) enabled by floating PLLIN/MODE, or pulse-skipping mode selected by grounding PLLIN/MODE - both supporting frequency foldback down to 18% of setpoint during overcurrent.
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 pre-regulation. |
| Negative Output Range | –0.4V to –150V - enables high-ratio inverting conversion using standard external components. |
| Quiescent Current | 70µA in Burst Mode - sustains ultra-low standby power in always-on automotive modules. |
| Switching Frequency | 50kHz to 850kHz (programmable) - allows EMI optimization and inductor size trade-offs. |
| Current Limit Threshold | 95mV (typical) at SENSE pin - provides precise peak inductor current control with <±10% variation over temp. |
| Feedback Reference | 0.800V ±9mV (VFB–VFBN) - ensures stable regulation of negative outputs with minimal line/load drift. |
| Gate Driver Strength | RUP = 2Ω / RDN = 0.9Ω - delivers fast turn-on/turn-off for high-side P-MOSFETs up to 100V VDS. |
| Shutdown IQ | 7µA - enables deep sleep in safety-critical shutdown states without auxiliary regulators. |
Pinout & Package
The LTC3863EMSE#PBF is housed in a thermally enhanced 12-lead plastic MSOP package with exposed PGND pad (Pin 13), requiring soldering to PCB for thermal and electrical integrity. θJA = 40°C/W, θJC = 10°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PGND (Pin 13) | Power Ground Reference | Exposed thermal pad tied to power ground plane - mandatory for rated thermal performance and noise isolation. |
| GATE (Pin 12) | P-Channel MOSFET Gate Driver Output | Drives external high-side P-MOSFET with 2Ω pull-up / 0.9Ω pull-down - supports fast switching up to 850kHz. |
| VIN (Pin 11) | Main Power Supply Input | Supplies chip logic and gate driver LDO; accepts 3.5V–60V input with UVLO at 3.25V (typ). |
| SENSE (Pin 10) | Current Sense Input | Kelvin-connected to RSENSE between VIN and SENSE - measures peak inductor current with 95mV threshold. |
| CAP (Pin 9) | Gate Bias LDO Output | Provides regulated 8V (VIN–VCAP) for P-MOSFET gate drive; requires ≥0.1µF low-ESR ceramic bypass. |
| RUN (Pin 8) | Enable Control Input | Logic-compatible enable with 1.26V threshold and 150mV hysteresis - supports direct connection to 60V supplies. |
| VFBN (Pin 7) | Inverting Feedback Node | Center tap of RFB1/RFB2 divider for negative output sensing; 0V threshold enables inverting amplifier operation. |
| VFB (Pin 5) | Feedback Reference Input | Regulated to 0.800V vs VFBN; sets output as VOUT = –(RFB1/RFB2) × 0.800V in inverting configuration. |
| ITH (Pin 6) | Error Amplifier Output / Compensation | 0–2.9V control node for current threshold and loop compensation - requires RITH ≥10kΩ for stability. |
| SS (Pin 4) | Soft-Start / Tracking Input | Internal 10µA pull-up charges external capacitor for controlled ramp; also accepts resistor-divider tracking signal. |
| FREQ (Pin 2) | Frequency Setpoint Input | 20µA current source sets oscillator frequency via external resistor; ground = 350kHz, open = 535kHz. |
| PLLIN/MODE (Pin 1) | Clock Sync Input / Light-Load Mode Select | Floating = Burst Mode (70µA IQ); grounded = pulse-skipping; driven = phase-locked to 75–750kHz external clock. |
Key Features
| Feature | Design Value |
|---|---|
| Verified Adjacent Pin FMEA | Guaranteed fault tolerance against open/short faults between any two adjacent pins - critical for ASIL-B automotive compliance. |
| Programmable Frequency Foldback | Reduces switching frequency to 18% of setpoint when VFB drops below 0.4V - limits inrush and short-circuit current without external circuitry. |
| Strong High-Voltage Gate Driver | 2Ω pull-up / 0.9Ω pull-down with 8V gate bias LDO - enables reliable drive of 100V+ P-MOSFETs in high-noise industrial settings. |
| Accurate Differential Feedback Sensing | VFB–VFBN = 0.800V ±9mV over –40°C to 125°C - eliminates ground-referenced sensing errors in negative rail applications. |
| Low Shutdown IQ (7µA) | Enables fail-safe shutdown with minimal battery drain in always-on vehicle modules - meets ISO 16750-2 cold crank requirements. |
| Internal Soft-Start Guarantee | Activates if SS slew rate exceeds 1.2V/ms - ensures monotonic start-up even during short-circuit recovery or pre-biased conditions. |
Applications
| Automotive Infotainment Power | Industrial Data Acquisition |
|---|---|
|
Use Scenario: Generating –12V rail for analog front-end op-amps and ADC drivers in vehicle head units under 12V battery supply. IC Role / Device Role / Timing Role: Inverting DC/DC controller regulating negative output using external P-MOSFET and Schottky diode. Use Value: 70µA Burst Mode IQ extends battery runtime during vehicle sleep mode; 60V input withstands load-dump transients. |
Use Scenario: Providing isolated –5V supply for precision instrumentation amplifiers in factory-floor PLC I/O modules. IC Role / Device Role / Timing Role: Nonsynchronous inverting controller with programmable soft-start to prevent output overshoot during hot-swap insertion. Use Value: Accurate 0.800V reference and <±0.1% load regulation ensure stable sensor biasing across temperature and load variations. |
| Telecom Line Card Bias | Distributed Power Systems |
|
Use Scenario: Creating –48V bias for RF power amplifiers in 4G/5G base station line cards fed from +48V backplane. IC Role / Device Role / Timing Role: High-voltage inverting controller driving discrete P-MOSFET with external sync to system clock for EMI reduction. Use Value: Phase-lockable 75–750kHz operation enables synchronized switching across multiple converters to suppress beat frequencies. |
Use Scenario: Local negative voltage generation for FPGA I/O banks in modular server power architectures with distributed 12V input. IC Role / Device Role / Timing Role: Peak current mode controller with programmable frequency and tracking to coordinate start-up with main +1.2V rail. Use Value: SS pin tracking capability ensures controlled sequencing without external supervisors - reduces BOM count and layout complexity. |
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 |
|---|---|---|---|
| LTC3864EMSE#PBF | Noninverting buck-only topology; lacks VFBN pin and inverting amplifier; same pinout and package. | Suitable only for positive-output step-down, not negative rail generation. | Select LTC3864EMSE#PBF only when designing +VOUT buck converters - not a functional substitute for LTC3863EMSE#PBF's inverting capability. |
| LM51xx series (e.g., LM5164) | Wide-input synchronous buck controller; no native inverting support; requires external inverting stage or transformer. | Requires additional components to achieve negative output; higher solution cost and board area. | Choose LM5164 only if synchronous rectification and >95% efficiency at medium loads outweigh added design complexity for negative rails. |
Compared with LTC3864EMSE#PBF and LM5164, the LTC3863EMSE#PBF uniquely delivers single-chip inverting control with integrated VFBN sensing, eliminating external op-amps or transformers while maintaining automotive-grade reliability and 70µA light-load IQ.
Availability
LTC3863EMSE#PBF is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial data acquisition modules, and telecom line card power supplies requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC3863EMSE#PBF 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 LTC3863EMSE#PBF belongs to Analog Devices' Power by Linear™ controller family, designed specifically for robust, high-voltage DC/DC conversion in mission-critical automotive and industrial environments where reliability, wide input range, and negative rail generation are essential.
FAQ
What is the operating temperature range for the LTC3863EMSE#PBF?
The LTC3863EMSE#PBF is specified for operation from –40°C to +125°C junction temperature. This grade (E-grade) is validated across the full range for automotive cabin and industrial control applications, with thermal derating applied above 125°C per Analog Devices' reliability guidelines. The MSOP package's θJA of 40°C/W enables this rating with appropriate PCB copper area.
How does the LTC3863EMSE#PBF achieve negative output voltage regulation?
The LTC3863EMSE#PBF uses differential feedback sensing via VFBN and VFB pins: VFBN connects to the center of a resistor divider between VOUT and VFB, establishing VREG = VFB – VFBN = 0.800V. This allows direct regulation of negative outputs without level-shifting circuitry. The inverting amplifier architecture inherently supports VOUT < 0V relative to system ground.
Can the LTC3863EMSE#PBF be synchronized to an external clock?
Yes, the LTC3863EMSE#PBF supports external clock synchronization via the PLLIN/MODE pin. When driven with a clean square wave between 75kHz and 750kHz (VIH ≥2V, VIL ≤0.5V), the internal PLL aligns the GATE turn-on edge to the rising edge of the external clock - enabling EMI reduction in multi-converter systems without modifying the LTC3863EMSE#PBF's core control loop.
What protection features are built into the LTC3863EMSE#PBF?
The LTC3863EMSE#PBF integrates overvoltage lockout (10% VFB threshold), cycle-by-cycle overcurrent limiting (95mV SENSE threshold), short-circuit frequency foldback (down to 18% of setpoint), and undervoltage lockout (3.25V typical). These operate autonomously without external components, ensuring safe startup and fault recovery in automotive and industrial deployments.
Is the LTC3863EMSE#PBF pin-compatible with other members of the LTC386x family?
The LTC3863EMSE#PBF shares identical 12-lead MSOP pinout with LTC3864EMSE#PBF, but functional differences exist: LTC3864 lacks VFBN and inverting capability. It is not pin-compatible with LTC3862 or LTC3865 due to differing pin assignments for FREQ, PLLIN/MODE, and VFBN. Always verify function mapping before substitution.
LTC3863EMSE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 12-TSSOP (0.118", 3.00mm Width) Exposed Pad
- Packaging:
- Tube
- 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#PBF FAQ
1.How can I place an order for LTC3863EMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3863EMSE#PBF 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#PBF reliable?
The price and inventory of LTC3863EMSE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3863EMSE#PBF is usually 5 days.
3.What payment methods are accepted for LTC3863EMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3863EMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3863EMSE#PBF?
LTC3863EMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3863EMSE#PBF 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#PBF?
For technical support, including LTC3863EMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3863EMSE#PBF requirements.
6.How does Aetrix verify that LTC3863EMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3863EMSE#PBF 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#PBF meets industry standards.
7.What is the process for return or replacement of LTC3863EMSE#PBF?
All LTC3863EMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3863EMSE#PBF, 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#PBF part is unused and in its original packaging.
Return procedure for LTC3863EMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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