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Analog Devices Inc. LTC3863IMSE#PBF
- Part No.:
- LTC3863IMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 12-TSSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3863IMSE#PBF.pdf
- Description:
- IC REG CTRLR BUCK 12MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:177
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Product details
Overview
LTC3863IMSE#PBF 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#PBF datasheet, LTC3863IMSE#PBF pinout, LTC3863IMSE#PBF application, or LTC3863IMSE#PBF equivalent, this page delivers verified technical context, exact pin functions, confirmed negative-output converter design parameters, and validated alternative options for high-voltage inverting supply designs.
Technical Context
The LTC3863IMSE#PBF implements peak current mode control with constant-frequency PWM architecture, using an internal transconductance error amplifier (1.8mS) and slope compensation to regulate output via VFB–VFBN differential sensing. Its inverting topology requires RFB1/RFB2 resistor divider between VOUT and VFBN to set output voltage as –(RFB1/RFB2) × 0.8V.
It integrates a dedicated 8V LDO for P-MOSFET gate drive (VIN–VCAP), with UVLO activation at 3.25V (typ) VIN–VCAP and recovery at 3.5V (typ). Frequency foldback activates when VFB drops below 0.4V, reducing switching frequency to ~18% of programmed value to limit inrush and short-circuit current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5V to 60V - supports wide automotive battery and industrial rail inputs without pre-regulation. |
| Negative Output Range | –0.4V to –150V - enables deep negative biasing for op-amps, RF stages, and sensor interfaces. |
| Quiescent Current | 70µA in Burst Mode - sustains ultra-low standby power in always-on automotive modules. |
| Switching Frequency | 50kHz to 850kHz (programmable) - balances EMI, efficiency, and inductor size across applications. |
| Current Limit Threshold | 95mV (typ) at SENSE pin - sets precise peak inductor current limit with ±10mV tolerance. |
| Feedback Reference | 0.800V (±9mV) at VFB–VFBN - ensures accurate output regulation independent of load or line variation. |
| Gate Driver Bias | VIN–VCAP = 8.0V (typ) - provides robust P-MOSFET turn-on drive even at low VIN (≥8V). |
| Shutdown Current | 7µA (max) - enables micropower system-level shutdown for battery-backed systems. |
Pinout & Package
Package: 12-lead plastic MSOP (MSE), thermally enhanced with exposed PGND pad (Pin 13) requiring PCB soldering for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PGND (Pin 13) | Power Ground Reference | Exposed thermal pad; must be soldered to PCB ground plane for θJC = 10°C/W and safe 150°C junction operation. |
| GATE (Pin 12) | P-Channel MOSFET Gate Driver Output | Drives external high-side P-MOSFET; output swing referenced to VIN, not ground. |
| 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 | Kelvin-connected to RSENSE; senses VIN–SENSE differential for peak current limiting (95mV threshold). |
| CAP (Pin 9) | Gate Driver Bias Capacitor Terminal | Connects to VIN via ≥0.1µF low-ESR ceramic; forms LDO output filter for stable 8V VIN–VCAP regulation. |
| RUN (Pin 8) | Enable/Shutdown Control | Logic-high (>1.26V) enables operation; internal 0.4µA pull-up allows direct connection to 60V supply. |
| VFBN (Pin 7) | Inverting Feedback Node | Center tap of RFB1/RFB2 divider; enables negative-output regulation; >2V disables inverter for buck mode. |
| VFB (Pin 5) | Feedback Reference Input | Regulated to 0.800V vs VFBN; determines output voltage accuracy and loop stability. |
| ITH (Pin 6) | Error Amplifier Output / Compensation Point | 0–2.9V range; connects to RC network for loop compensation; minimum RITH = 10kΩ required. |
| SS (Pin 4) | Soft-Start / Tracking Input | Internal 10µA pull-up charges external capacitor; regulates VFB to SS voltage during startup or tracking. |
| FREQ (Pin 2) | Frequency Setpoint Input | 20µA current source develops voltage across RFREQ; sets oscillator from 50kHz–850kHz or selects fixed 350/535kHz. |
| PLLIN/MODE (Pin 1) | Clock Sync Input / Light-Load Mode Select | Floating enables 70µA Burst Mode; grounded enables pulse-skipping; external clock synchronizes GATE edge. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable Burst Mode | Reduces light-load IQ to 70µA while maintaining regulation-critical for automotive infotainment standby. |
| Phase-Lockable Frequency | Synchronizes GATE turn-on to external 75–750kHz clock-enables multi-rail EMI reduction in dense PCB layouts. |
| Verified FMEA for Adjacent Pin Faults | Guarantees safe operation under open/short faults between neighboring pins-required for ASIL-B automotive designs. |
| Accurate Current Limit | ±10mV tolerance on 95mV sense threshold enables repeatable overcurrent protection without calibration. |
| Programmable Soft-Start or Tracking | Single SS pin supports either controlled ramp-up or coordinated sequencing with positive rails-simplifies multi-supply systems. |
| Strong Gate Driver with Foldback | 8V VIN–VCAP drive + frequency foldback below 0.4V VFB limits inrush and short-circuit energy-enhances reliability. |
Applications
| Automotive Infotainment Systems | Industrial Sensor Signal Conditioning |
|---|---|
|
Use Scenario: Generating –5V/1.7A bias for audio DACs and op-amp front-ends in head units with 12V battery input. IC Role / Device Role / Timing Role: Inverting controller regulating negative rail using external Si7129 P-MOSFET and B540C Schottky diode. Use Value: 70µA Burst Mode IQ extends battery life during vehicle sleep mode; 60V input withstands load-dump transients. |
Use Scenario: Providing –12V precision bias for strain-gauge bridge amplifiers in factory-floor pressure sensors. IC Role / Device Role / Timing Role: High-accuracy inverting regulator with 0.800V reference and Kelvin current sensing for stable offset control. Use Value: ±9mV VFB reference and programmable soft-start prevent sensor output glitches during power-up. |
| Telecom Line Card Power | Distributed Data Acquisition Systems |
|
Use Scenario: Deriving –48V auxiliary rail from 48V backplane for analog interface ICs in optical line cards. IC Role / Device Role / Timing Role: High-voltage inverting controller driving discrete P-MOSFET with synchronized 350kHz switching. Use Value: PLL synchronization eliminates beat frequencies between multiple LTC3863IMSE#PBF converters on shared backplane. |
Use Scenario: Creating isolated –15V supply for ADC reference buffers in modular I/O systems with 24V industrial bus. IC Role / Device Role / Timing Role: Negative-output controller with frequency foldback protecting against field-wiring shorts. Use Value: 18% foldback frequency scaling ensures consistent short-circuit current limiting across all operating frequencies. |
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#PBF | Non-inverting buck-only topology; no VFBN pin; fixed 0.8V VFB reference only. | Cannot generate negative outputs; suitable only for positive step-down where inverting capability is unnecessary. | Select LTC3864IMSE#PBF only when negative output is not required and board layout favors simplified feedback. |
| LM5160QPWPRQ1 | 65V synchronous buck controller; integrated high-side N-MOSFET driver; no inverting capability. | Requires external inverting stage (e.g., charge pump or transformer) to achieve negative output; higher BOM count. | Choose LM5160QPWPRQ1 for high-efficiency positive rails where automotive AEC-Q100 qualification is mandatory. |
Compared with LTC3864IMSE#PBF and LM5160QPWPRQ1, the LTC3863IMSE#PBF uniquely delivers single-chip inverting control with programmable negative output, making it irreplaceable for space-constrained negative-bias applications without added conversion stages.
Availability
LTC3863IMSE#PBF is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial sensor signal conditioning, and telecom line card power requiring stable component supply across extended temperature ranges.
Supply support for LTC3863IMSE#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.
The LTC3863IMSE#PBF belongs to Analog Devices' Power by Linear™ high-voltage DC/DC controller family, designed specifically for robust negative-output and wide-input industrial power conversion with automotive-grade reliability.
FAQ
What is the maximum negative output voltage achievable with the LTC3863IMSE#PBF?
The LTC3863IMSE#PBF supports negative output voltages from –0.4V up to beyond –150V. The practical upper limit depends on external components-especially the voltage rating of the P-MOSFET, Schottky catch diode, and output capacitor-and duty cycle constraints. For example, with a 12V input, –150V output requires careful selection of high-voltage MOSFETs and isolation design to manage stress and leakage.
Does the LTC3863IMSE#PBF require an external Schottky diode, and why?
Yes, the LTC3863IMSE#PBF requires an external Schottky diode (e.g., B540C) as the commutating catch diode in its nonsynchronous inverting topology. Because it drives only a P-channel high-side MOSFET, the diode provides the return path for inductor current during the off-time. Schottky selection is critical for low forward voltage and fast recovery to minimize conduction loss and reverse recovery noise.
How does the LTC3863IMSE#PBF implement frequency foldback during overload?
The LTC3863IMSE#PBF activates frequency foldback when VFB falls below 0.4V-indicating severe overload or short-circuit. The switching frequency linearly decreases to ~18% of the programmed value, reducing peak current per cycle and limiting average power dissipation. This behavior is intrinsic to the control loop and requires no external components, enhancing reliability during fault conditions.
Can the LTC3863IMSE#PBF be used in non-inverting buck configuration?
Yes, the LTC3863IMSE#PBF can operate as a non-inverting buck controller by pulling VFBN above 2V (but below 5V), which disables the internal inverting amplifier. In this mode, feedback is applied directly to VFB using a standard resistive divider to SGND, and output voltage equals (RFB1 + RFB2)/RFB2 × 0.8V. However, the LTC3863IMSE#PBF remains optimized for inverting use; buck-mode performance is secondary.
What is the thermal requirement for the exposed PGND pad on the LTC3863IMSE#PBF MSOP package?
The exposed PGND pad (Pin 13) on the LTC3863IMSE#PBF MSOP package must be soldered to a PCB copper area to achieve rated thermal performance: θJA = 40°C/W and θJC = 10°C/W. Without proper soldering, junction temperature rise increases significantly, risking thermal shutdown or long-term reliability degradation-especially at full load and high ambient temperatures.
LTC3863IMSE#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
LTC3863IMSE#PBF FAQ
1.How can I place an order for LTC3863IMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3863IMSE#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 LTC3863IMSE#PBF reliable?
The price and inventory of LTC3863IMSE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3863IMSE#PBF is usually 5 days.
3.What payment methods are accepted for LTC3863IMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3863IMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3863IMSE#PBF?
LTC3863IMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3863IMSE#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 LTC3863IMSE#PBF?
For technical support, including LTC3863IMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3863IMSE#PBF requirements.
6.How does Aetrix verify that LTC3863IMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3863IMSE#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 LTC3863IMSE#PBF meets industry standards.
7.What is the process for return or replacement of LTC3863IMSE#PBF?
All LTC3863IMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3863IMSE#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 LTC3863IMSE#PBF part is unused and in its original packaging.
Return procedure for LTC3863IMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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