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Analog Devices Inc. LTC3863HMSE#PBF
- Part No.:
- LTC3863HMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 12-TSSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3863HMSE#PBF.pdf
- Description:
- IC REG CTRLR BUCK 12MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:221
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Product details
Overview
LTC3863HMSE#PBF from Analog Devices is a high-voltage, low-quiescent-current inverting DC/DC controller for generating negative output voltages. It drives an external P-channel MOSFET, supports input ranges from 3.5V to 60V, delivers –0.4V to –150V outputs, and operates with only one inductor. Its 70µA Burst Mode IQ, 50kHz–850kHz programmable switching frequency, and –40°C to 150°C junction temperature rating make it suitable for automotive infotainment power rails and industrial isolated bias supplies.
For engineers reviewing the LTC3863HMSE#PBF datasheet, LTC3863HMSE#PBF pinout, LTC3863HMSE#PBF application, or LTC3863HMSE#PBF equivalent, key selection criteria include its inverting topology support, high-side P-MOSFET gate drive capability (8V VCAP), verified adjacent-pin FMEA, programmable soft-start/tracking, and thermal performance in the 12-lead MSOP package with exposed PGND pad.
Technical Context
The LTC3863HMSE#PBF implements peak current mode control with constant-frequency PWM, using an internal transconductance error amplifier (1.8 mS) and slope compensation to stabilize loop dynamics. Its inverting architecture relies on dual feedback inputs (VFB and VFBN) to regulate negative outputs via resistor-divider programming, where VREG = VFB – VFBN = 0.800 V (±1.1%).
It integrates a dedicated 8V LDO for gate bias (VIN–VCAP), with dropout behavior below 3.25V (typical), and features frequency foldback triggered when VFB falls below 0.4V-reducing switching frequency to ~18% of setpoint during overcurrent or short-circuit events. The RUN pin enables digital control with 1.26V threshold and 150mV hysteresis, while PLLIN/MODE selects between Burst Mode (70µA IQ) and pulse-skipping operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5V to 60V - supports wide automotive battery transients and industrial unregulated rails. |
| Negative Output Range | –0.4V to >–150V - enables high-ratio inverting conversion without transformer coupling. |
| Quiescent Current (Burst Mode) | 70µA - sustains ultra-low standby power in always-on systems like telematics modules. |
| Switching Frequency Range | 50kHz to 850kHz - adjustable via external resistor on FREQ pin for EMI optimization and size trade-offs. |
| Gate Drive Bias (VIN–VCAP) | 8.0V (typical) - ensures strong turn-on of high-threshold P-MOSFETs with minimal RDS(on) penalty. |
| Current Limit Threshold | 95mV (typical) - sets precise peak inductor current limit independent of temperature drift. |
| Operating Junction Temp | –40°C to +150°C - qualified for under-hood automotive and high-temp industrial environments. |
| Feedback Reference Voltage | 0.800V ±1.1% - defines output regulation accuracy across load, line, and temperature. |
Pinout & Package
The LTC3863HMSE#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; must be soldered to PCB ground plane for rated thermal performance and noise isolation. |
| GATE (Pin 12) | P-Channel MOSFET Driver Output | High-current source/sink capable of driving large P-MOSFET gates; disabled if VIN–VCAP < 3.25V. |
| VIN (Pin 11) | Main Supply Input | Primary power rail (3.5V–60V); powers internal circuitry and feeds CAP LDO. |
| SENSE (Pin 10) | Current Sense Input | Kelvin-connected to sense resistor; detects peak inductor current for cycle-by-cycle limiting. |
| CAP (Pin 9) | Gate Bias LDO Output | Provides regulated 8V bias (relative to VIN) for P-MOSFET gate drive; requires ≥0.1µF ceramic bypass. |
| RUN (Pin 8) | Enable/Shutdown Control | Logic-compatible input; 1.26V threshold with 150mV hysteresis; pulls up internally at 0.4µA. |
| VFBN (Pin 7) | Inverting Feedback Node | Connects center of RFB1/RFB2 divider; enables negative-output regulation; disable by pulling >2V for buck mode. |
| VFB (Pin 5) | Feedback Reference Input | Regulated to 0.800V; combined with VFBN to define VREG; triggers overvoltage lockout at +10%. |
| ITH (Pin 6) | Error Amplifier Output / Compensation | 0–2.9V range; sets peak 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 ramp-up. |
| FREQ (Pin 2) | Frequency Setpoint Input | 20µA current source develops voltage across RFREQ; sets oscillator from 50kHz–850kHz. |
| PLLIN/MODE (Pin 1) | Clock Sync Input / Light-Load Mode Select | Floating = Burst Mode (70µA IQ); grounded = pulse-skipping; driven = PLL sync (75–750kHz). |
Key Features
| Feature | Design Value |
|---|---|
| Verified Adjacent Pin FMEA | Guaranteed fault tolerance against open/short failures between neighboring pins per AEC-Q100-relevant analysis. |
| Programmable Soft-Start or Tracking | Enables controlled startup into pre-biased loads or coordinated sequencing with other rails via resistor divider on SS pin. |
| Strong P-MOSFET Gate Driver | Integrated 8V LDO (VIN–VCAP) with 0.9Ω pull-down and 2Ω pull-up ensures fast, robust switching of high-VGS(th) devices. |
| Frequency Foldback Protection | Reduces switching frequency to ~18% of setpoint when VFB < 0.4V, limiting power dissipation during short-circuit faults. |
| Low Shutdown IQ | 7µA shutdown current minimizes battery drain in parked-vehicle applications such as ADAS sensors. |
| Phase-Lockable Oscillator | Synchronizes GATE edge to external clock (75–750kHz), enabling multi-phase designs and EMI reduction via spread-spectrum alignment. |
Applications
| Automotive Infotainment Power | Industrial Isolated Bias Supply |
|---|---|
Use Scenario: Generating –5V rail for analog audio codecs and ADCs in head units with 12V battery input. IC Role / Device Role / Timing Role: Inverting controller regulating negative output using single inductor and external P-MOSFET. Use Value: Eliminates need for transformer-based isolated converters; achieves >85% efficiency at 1.7A with 70µA light-load IQ. |
Use Scenario: Providing –12V bias for op-amps and level-shifters in PLC I/O modules powered from 24V DC bus. IC Role / Device Role / Timing Role: High-voltage inverting PMOS controller supporting 60V max input and wide output adjustment. Use Value: Enables compact, non-isolated negative rail generation with programmable soft-start to prevent inrush into capacitive loads. |
| Telecom Line Card Bias | Distributed Power System |
Use Scenario: Deriving –48V auxiliary supply from +48V backplane for interface ICs in telecom line cards. IC Role / Device Role / Timing Role: Robust inverting controller with 60V input rating and frequency foldback for short-circuit resilience. Use Value: Supports high-ratio conversion (1:1) with stable regulation under transient load steps up to 3.2A. |
Use Scenario: Local negative voltage generation for sensor signal conditioning in distributed IoT edge nodes. IC Role / Device Role / Timing Role: Low-IQ inverting controller operating from wide-input DC-DC stage with tracking capability. Use Value: Enables rail-to-rail sequencing with main system supply via SS pin tracking, reducing BOM count and board area. |
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 | Non-inverting buck-only topology; lacks VFBN pin and inverting feedback capability. | Requires positive-output configurations only; cannot generate negative voltages directly. | Select only when negative output is unnecessary and higher efficiency at light loads is prioritized. |
| LM5180QPWPRQ1 | Current-mode flybuck controller with integrated 100V MOSFET; supports isolated negative outputs via coupled inductor. | Provides galvanic isolation; requires transformer design; higher component count but eliminates optocoupler feedback. | Prefer for safety-critical isolated applications where creepage/clearance or regulatory compliance mandates separation. |
Compared with LTC3863HMSE#PBF, LTC3864EMSE#PBF offers lower IQ in buck mode but no inverting capability, while LM5180QPWPRQ1 adds isolation at the cost of layout complexity and fixed 100V MOSFET voltage rating-making LTC3863HMSE#PBF optimal for non-isolated, high-flexibility negative rail generation.
Availability
LTC3863HMSE#PBF is available at Aetrix Electronics and suitable for automotive infotainment power, industrial PLC bias supplies, and telecom line card applications requiring stable component supply across extended temperature and long product lifecycles.
Supply support for LTC3863HMSE#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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, industrial automation, and automotive markets.
The LTC3863HMSE#PBF belongs to Analog Devices' Power by Linear™ high-voltage DC/DC controller family, designed specifically for robust, efficient negative-output power conversion in harsh environments including automotive under-hood and factory-floor applications.
FAQ
What is the maximum input voltage supported by the LTC3863HMSE#PBF?
The LTC3863HMSE#PBF supports an absolute maximum input voltage of 65V, with continuous operation specified from 3.5V to 60V. This wide input range accommodates automotive cold-crank (down to 3.5V) and load-dump (up to 60V) conditions without external protection circuitry.
How does the LTC3863HMSE#PBF achieve negative output voltage regulation?
The LTC3863HMSE#PBF uses dual feedback inputs-VFB and VFBN-to implement an inverting amplifier configuration. By connecting a resistor divider between VOUT and VFB with VFBN at the midpoint, the device regulates VREG = VFB – VFBN to 0.800V, enabling precise negative output programming without polarity inversion hardware.
Can the LTC3863HMSE#PBF be synchronized to an external clock?
Yes, the LTC3863HMSE#PBF supports synchronization via the PLLIN/MODE pin. When driven with a clean square wave (0.5V LO / 2V HI), the internal phase-locked loop aligns the GATE turn-on edge to the rising edge of the external clock across 75kHz–750kHz, enabling noise-sensitive multi-rail systems to avoid beat frequencies.
What thermal considerations apply to the LTC3863HMSE#PBF in MSOP package?
The LTC3863HMSE#PBF in 12-lead MSOP has θJA = 40°C/W and θJC = 10°C/W. Its exposed PGND pad (Pin 13) must be soldered to a minimum 100mm² copper area for effective heat transfer. At 150°C max junction temperature, ambient derating begins above ~105°C with typical 1.5W dissipation in full-load operation.
Does the LTC3863HMSE#PBF support output voltage tracking during startup?
Yes, the LTC3863HMSE#PBF supports output tracking via the SS pin. Connecting an external resistor divider from another supply to SS allows the negative output to ramp in proportion to that reference, ensuring controlled sequencing in multi-rail systems-critical for FPGA or DSP core/logic rail coordination.
LTC3863HMSE#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 ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-MSOP-EP
LTC3863HMSE#PBF FAQ
1.How can I place an order for LTC3863HMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3863HMSE#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 LTC3863HMSE#PBF reliable?
The price and inventory of LTC3863HMSE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3863HMSE#PBF is usually 5 days.
3.What payment methods are accepted for LTC3863HMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3863HMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3863HMSE#PBF?
LTC3863HMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3863HMSE#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 LTC3863HMSE#PBF?
For technical support, including LTC3863HMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3863HMSE#PBF requirements.
6.How does Aetrix verify that LTC3863HMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3863HMSE#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 LTC3863HMSE#PBF meets industry standards.
7.What is the process for return or replacement of LTC3863HMSE#PBF?
All LTC3863HMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3863HMSE#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 LTC3863HMSE#PBF part is unused and in its original packaging.
Return procedure for LTC3863HMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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