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Analog Devices Inc. LTC3863MPMSE#PBF
- Part No.:
- LTC3863MPMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 12-TSSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3863MPMSE#PBF.pdf
- Description:
- IC REG CTRLR BUCK 12MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,907
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Product details
Overview
LTC3863MPMSE#PBF from Analog Devices is a high-voltage, low-quiescent-current inverting DC/DC controller for generating negative output rails. It drives an external P-channel MOSFET, supports 3.5V–60V input, delivers –0.4V to –150V output, draws only 70µA in Burst Mode, and operates up to 850kHz - ideal for automotive cold-crank and industrial isolated bias supply designs.
For engineers reviewing the LTC3863MPMSE#PBF datasheet, LTC3863MPMSE#PBF pinout, LTC3863MPMSE#PBF application, or LTC3863MPMSE#PBF equivalent, key selection factors include its –55°C to 150°C extended temperature rating, programmable frequency (50–850kHz), verified adjacent-pin FMEA, peak current mode control, and integrated gate driver with 8V VIN–VCAP regulation.
Technical Context
The LTC3863MPMSE#PBF 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/VFB differential sensing to regulate negative outputs, while the ITH pin serves as both compensation node and current threshold reference (0–2.9V range).
It integrates a dedicated 8V LDO for P-MOSFET gate drive (VIN–VCAP), with dropout protection below 3.25V, plus dual light-load modes: user-selectable Burst Mode (70µA IQ) or pulse-skipping. Frequency foldback activates when VFB drops below 0.4V, scaling foldback to 18% of set frequency for robust short-circuit limiting.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5V to 60V - supports automotive battery transients and wide industrial inputs. |
| Negative Output Range | –0.4V to beyond –150V - enables high-ratio inverting supplies without transformers. |
| Quiescent Current (Burst) | 70µA - sustains ultra-low power operation during standby in battery-backed systems. |
| Switching Frequency | 50kHz to 850kHz - programmable via resistor or synchronized externally (75–750kHz). |
| Current Limit Threshold | 95mV (typ) across RSENSE - provides accurate, Kelvin-sensed peak inductor current limiting. |
| Operating Temperature | –55°C to +150°C - fully tested and guaranteed for extreme automotive under-hood and industrial environments. |
| Gate Driver Supply | VIN–VCAP = 8V (regulated) - ensures strong turn-on drive for high-threshold P-MOSFETs. |
Pinout & Package
Package: 12-lead plastic MSOP with exposed PGND pad (pin 13), thermally enhanced for high-power density layouts. 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 rated θJC = 10°C/W and safe high-current operation. |
| GATE (Pin 12) | P-Channel MOSFET Driver Output | High-current source/sink output; drives external PMOS gate using regulated VIN–VCAP bias. |
| VIN (Pin 11) | Main Power Input Supply | Supplies internal circuitry and gate driver LDO; requires ≥0.1µF local ceramic bypass to PGND. |
| SENSE (Pin 10) | Current Sense Input | Kelvin-connected to RSENSE; measures VIN–SENSE differential for precise peak current limit (95mV threshold). |
| CAP (Pin 9) | Gate Driver Bias Capacitor Node | Connects to VIN via ≥0.1µF low-ESR ceramic; forms bypass for internal 8V LDO regulating VIN–VCAP. |
| RUN (Pin 8) | Enable/Shutdown Control | Logic-compatible input; >1.26V enables operation; internal 0.4µA pull-up allows direct connection to 60V supply. |
| VFBN (Pin 7) | Inverting Feedback Reference | Center-tap of RFB1/RFB2 divider; enables negative-output regulation; tie >2V to disable inverter and use as buck controller. |
| VFB (Pin 5) | Feedback Voltage Input | Regulated to 0.800V ±1%; differential with VFBN sets output voltage: VOUT = –(RFB1/RFB2) × 0.8V. |
| ITH (Pin 6) | Error Amplifier Output / Compensation | 0–2.9V analog control node; sets peak inductor current threshold; requires RITH ≥10kΩ for stability. |
| SS (Pin 4) | Soft-Start / Tracking Input | Internal 10µA pull-up charges external capacitor; regulates VFB to SS voltage during startup for controlled ramp or supply tracking. |
| FREQ (Pin 2) | Frequency Setpoint Input | 20µA current source develops voltage across RFREQ; sets oscillator from 50kHz–850kHz; ground = 350kHz, open = 535kHz. |
| PLLIN/MODE (Pin 1) | Sync Clock Input / Light-Load Mode Select | Floating = Burst Mode (70µA); grounded = pulse-skipping; external clock (75–750kHz) enables phase-locked synchronization. |
Key Features
| Feature | Design Value |
|---|---|
| Extended Temperature Grade | –55°C to +150°C operating junction range - fully tested and qualified for aerospace, military, and harsh-environment applications. |
| Verified Adjacent Pin FMEA | Robust layout immunity - validated against open/short faults between neighboring pins per AEC-Q100 stress models. |
| Programmable Light-Load Efficiency | Selectable Burst Mode (70µA IQ) or pulse-skipping - balances efficiency, ripple, and EMI for system-level optimization. |
| Integrated Gate Driver LDO | Regulates VIN–VCAP to 8V with <0.5V dropout - ensures reliable P-MOSFET turn-on even at low VIN (e.g., 5V cold-crank). |
| Frequency Foldback Protection | Reduces switching frequency to 18% of set value when VFB < 0.4V - limits power dissipation during start-up and short-circuit events. |
| Dual Topology Flexibility | Configurable as inverting controller (default) or noninverting buck (VFBN > 2V) - reuses same IC across positive/negative rail designs. |
Applications
| Automotive Cold-Crank Bias Supply | Industrial Isolated Sensor Bias |
|---|---|
Use Scenario: Generating –5V or –12V bias for op-amps, ADCs, and isolated interfaces in engine control units during 3.5V battery brownout. IC Role / Device Role / Timing Role: Inverting DC/DC controller regulating negative output using external PMOS and Schottky diode; no transformer required. Use Value: Maintains stable –5V/1.7A output down to 3.5V input with 70µA quiescent current, enabling always-on sensor monitoring during ignition-off states. |
Use Scenario: Providing isolated negative supply for precision instrumentation amplifiers in factory automation PLC I/O modules. IC Role / Device Role / Timing Role: High-voltage inverting controller driving discrete PMOS switch; supports >60V input from 48V industrial bus. Use Value: Delivers –15V @ 500mA with <1% line/load regulation across –55°C to +150°C, eliminating need for custom magnetics. |
| Telecom Line Card Negative Rail | Distributed Power System Sequencing |
Use Scenario: Generating –48V intermediate rail from 48V backplane for legacy telecom interface circuits requiring strict EMI control. IC Role / Device Role / Timing Role: Constant-frequency current-mode controller with programmable 350kHz switching and external clock sync capability. Use Value: Enables clean, low-noise –48V generation with pulse-skipping mode to minimize audible noise and conducted EMI in dense line cards. |
Use Scenario: Coordinating startup of multiple rails (e.g., +12V, –12V, +3.3V) in medical imaging power systems requiring precise voltage sequencing. IC Role / Device Role / Timing Role: Soft-start and tracking controller using SS pin to synchronize negative rail ramp with master +12V supply. Use Value: Ensures monotonic, glitch-free startup by forcing –12V to track +12V via resistor divider on SS pin - prevents latch-up in downstream logic. |
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#PBF | Noninverting buck-only topology; lacks VFBN pin and inverting amplifier; identical package/temp grade. | Only suitable for positive-output step-down; cannot generate negative voltages without external inverter stage. | Select LTC3864MPMSE#PBF only when designing +VOUT supplies and requiring same ruggedness and temperature range. |
| LTC3863HMSE#PBF | Same functionality and pinout; rated for –40°C to +150°C (not –55°C); lower cost; untested below –40°C. | Acceptable for most automotive under-hood applications but not for extended cold environments (e.g., arctic deployment, space-grade storage). | Choose LTC3863HMSE#PBF for cost-sensitive designs where full –55°C qualification is unnecessary. |
Compared with LTC3863HMSE#PBF and LTC3864MPMSE#PBF, the LTC3863MPMSE#PBF uniquely combines guaranteed –55°C operation, inverting topology support, and integrated frequency foldback - making it the sole option for mission-critical negative-rail generation in extreme-temperature environments.
Availability
LTC3863MPMSE#PBF is available at Aetrix Electronics and suitable for automotive cold-crank systems, industrial sensor bias supplies, and telecom line card power requiring stable component supply across extended temperature and high-reliability requirements.
Supply support for LTC3863MPMSE#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, power, and RF markets since 1965.
The LTC3863 belongs to Analog Devices' Power by Linear™ high-voltage DC/DC controller family, designed specifically for robust, efficient, and flexible power conversion in automotive, industrial, and telecom infrastructure applications.
FAQ
What is the guaranteed operating temperature range for LTC3863MPMSE#PBF?
The LTC3863MPMSE#PBF is fully tested and guaranteed over –55°C to +150°C junction temperature. This extended range exceeds standard automotive (–40°C to +125°C) and industrial (–40°C to +105°C) specifications, supporting deployment in aerospace, downhole, and extreme-environment applications where cold-start reliability is critical. The device undergoes full characterization and burn-in at both extremes.
How does LTC3863MPMSE#PBF achieve negative output regulation?
The LTC3863MPMSE#PBF uses differential feedback via VFBN and VFB pins: VFBN connects to the center of an RFB1/RFB2 divider between VOUT and VFB, enabling inverting amplifier operation. The internal reference is VREF = VFB – VFBN = 0.800V, so VOUT = –(RFB1/RFB2) × 0.8V. This architecture eliminates need for level-shifting or optocouplers in negative rail designs.
Can LTC3863MPMSE#PBF be used in noninverting buck configuration?
Yes - tie VFBN to a voltage >2V and <5V (e.g., via resistor divider from VIN) to disable the internal inverting amplifier. In this mode, the LTC3863MPMSE#PBF functions as a standard buck controller: VFB regulates directly to 0.800V against SGND, and output is VOUT = (RFB1 + RFB2)/RFB2 × 0.8V. All other features - Burst Mode, frequency programming, and protection - remain fully operational.
What is the purpose of the CAP pin on LTC3863MPMSE#PBF?
The CAP pin on LTC3863MPMSE#PBF serves as the output of the internal gate driver LDO, forming the –8V bias supply (VIN–VCAP) for the external P-channel MOSFET gate. A minimum 0.1µF low-ESR ceramic capacitor must connect CAP to VIN to stabilize the LDO. Below VIN = 8V, the LDO enters dropout and CAP follows VIN; gate drive disables if VIN–VCAP falls below 3.25V.
Does LTC3863MPMSE#PBF support external clock synchronization?
Yes - the PLLIN/MODE pin accepts an external clock signal from 75kHz to 750kHz. When driven, the internal phase-locked loop aligns the GATE turn-on edge with the rising edge of the external clock, enabling deterministic timing across multiple converters for EMI reduction and noise cancellation. Clock input thresholds are VIH = 2V and VIL = 0.5V; no additional components are required.
LTC3863MPMSE#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:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-MSOP-EP
LTC3863MPMSE#PBF FAQ
1.How can I place an order for LTC3863MPMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3863MPMSE#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 LTC3863MPMSE#PBF reliable?
The price and inventory of LTC3863MPMSE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3863MPMSE#PBF is usually 5 days.
3.What payment methods are accepted for LTC3863MPMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3863MPMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3863MPMSE#PBF?
LTC3863MPMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3863MPMSE#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 LTC3863MPMSE#PBF?
For technical support, including LTC3863MPMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3863MPMSE#PBF requirements.
6.How does Aetrix verify that LTC3863MPMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3863MPMSE#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 LTC3863MPMSE#PBF meets industry standards.
7.What is the process for return or replacement of LTC3863MPMSE#PBF?
All LTC3863MPMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3863MPMSE#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 LTC3863MPMSE#PBF part is unused and in its original packaging.
Return procedure for LTC3863MPMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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