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Analog Devices Inc. LTC3863MPDE#PBF
- Part No.:
- LTC3863MPDE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 12-WFDFN Exposed Pad
- Datasheet:
-
LTC3863MPDE#PBF.pdf
- Description:
- IC REG CTRLR BUCK 12DFN
- Quantity:
- Payment:
- Shipping:
Inventory:182
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Product details
Overview
LTC3863MPDE#PBF from Analog Devices is a high-voltage, low-quiescent-current inverting DC/DC PMOS controller for negative-output power conversion. It drives an external P-channel MOSFET to generate regulated negative voltages 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 - used in automotive infotainment power rails requiring robust start-up and fault recovery.
For engineers reviewing the LTC3863MPDE#PBF datasheet, LTC3863MPDE#PBF pinout, LTC3863MPDE#PBF application, or LTC3863MPDE#PBF equivalent, key selection criteria include its –55°C to +150°C extended temperature rating, verified adjacent-pin FMEA, phase-lockable synchronization (75–750kHz), accurate 95mV current limit threshold, and dual-mode light-load operation (Burst Mode vs. pulse-skipping).
Technical Context
The LTC3863MPDE#PBF implements peak current mode control with slope compensation and a transconductance error amplifier (1.8mS) referenced to a trimmed 0.800V internal VREF. Its inverting architecture uses VFBN as a dedicated inverting feedback node, enabling precise regulation of negative outputs via RFB1/RFB2 divider topology.
It integrates a high-side gate driver with an internal LDO regulating VIN–VCAP to 8.0V (±0.4V), delivering strong pull-up (2Ω) and pull-down (0.9Ω) drive for fast P-MOSFET switching. Fault protection includes overvoltage lockout (10% VFBN excursion), frequency foldback below 0.4V VFB, and UVLO with 3.25V (typ) turn-on hysteresis.
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 rail-to-rail negative bias generation for op-amps, ADCs, and RF front-ends. |
| Quiescent Current (Burst Mode) | 70µA - sustains ultra-low standby power in always-on vehicle modules. |
| Switching Frequency Range | 50kHz to 850kHz - adjustable via external resistor on FREQ pin; allows EMI optimization and inductor size trade-offs. |
| Current Limit Threshold | 95mV (typ) at SENSE pin - sets precise peak inductor current limit independent of temperature drift. |
| Operating Junction Temp | –55°C to +150°C - qualified for under-hood automotive and harsh industrial environments. |
| Gate Driver Pull-Up/Down | 2Ω / 0.9Ω - ensures fast P-MOSFET turn-on/turn-off, minimizing conduction losses and shoot-through risk. |
Pinout & Package
Package: 12-lead (4mm × 3mm) plastic DFN 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 θJA = 43°C/W and safe current return path. |
| GATE (Pin 12) | P-Channel MOSFET Gate Driver Output | Drives external high-side P-MOSFET; output swing limited by VIN–VCAP (regulated to ~8V). |
| VIN (Pin 11) | Main Power Supply Input | Supplies internal circuitry and gate driver LDO; requires ≥0.1µF low-ESR ceramic bypass to PGND. |
| SENSE (Pin 10) | Current Sense Differential Input | Kelvin-connected to RSENSE; senses VIN–SENSE voltage to enforce 95mV peak current limit. |
| CAP (Pin 9) | Gate Driver Bias Supply | Output of internal LDO; requires ≥0.1µF ceramic capacitor to VIN for stable 8V gate bias generation. |
| RUN (Pin 8) | Digital Enable/Shutdown Control | Active-high logic input; 1.26V threshold with 150mV hysteresis; internal 0.4µA pull-up enables direct 60V-compatible control. |
| VFBN (Pin 7) | Inverting Feedback Node | Connects center of RFB1/RFB2 divider; enables true inverting regulation; >2V disables inverter for buck mode. |
| VFB (Pin 5) | Feedback Reference Input | Regulated to 0.800V ±0.009V; error amplifier reference point; folds back frequency if <0.4V. |
| ITH (Pin 6) | Error Amplifier Output & Compensation | 0–2.9V control voltage; summed with slope ramp to set peak current; requires RITH ≥10kΩ. |
| 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 sets oscillator frequency via external resistor; ground = 350kHz, open = 535kHz. |
| PLLIN/MODE (Pin 1) | Sync Clock Input / Light-Load Mode Select | Accepts 75–750kHz external clock; floating = Burst Mode (70µA), grounded = pulse-skipping. |
Key Features
| Feature | Design Value |
|---|---|
| Extended Temperature Grade | LTC3863MPDE#PBF is fully tested and guaranteed over –55°C to +150°C junction range - suitable for engine compartment and industrial control applications. |
| Verified Adjacent-Pin FMEA | Manufacturing-tested fault tolerance against open/short between any two adjacent pins - critical for functional safety compliance (ISO 26262 ASIL-B readiness). |
| Programmable Light-Load Operation | Selectable Burst Mode (70µA IQ) or pulse-skipping via PLLIN/MODE pin - balances efficiency, ripple, and EMI in battery-powered systems. |
| Accurate Current Limit | 95mV (typ) sense threshold with ±10mV max variation over temperature - enables predictable overcurrent protection without calibration. |
| Robust Gate Drive | 2Ω pull-up / 0.9Ω pull-down strength with 8V regulated gate bias - ensures reliable P-MOSFET switching even with high Ciss devices. |
| Frequency Foldback Protection | Automatically reduces switching frequency to ~18% of setpoint when VFB <0.4V - limits inrush and short-circuit current without external circuitry. |
Applications
| Automotive Infotainment Power | Industrial Sensor Bias Supply |
|---|---|
Use Scenario: Generating –5V/1.7A rail for analog audio codecs and precision ADCs in head units. IC Role / Device Role / Timing Role: Inverting PMOS controller regulating negative output with soft-start and tracking to match positive supply ramp. Use Value: Eliminates need for isolated transformer or charge-pump IC; achieves >90% efficiency at full load while maintaining <50mV output ripple. |
Use Scenario: Providing –12V bias for MEMS pressure sensors and op-amp front-ends in process control transmitters. IC Role / Device Role / Timing Role: High-voltage inverting controller operating from 24V industrial bus, with UVLO and overvoltage protection. Use Value: Supports wide input range (3.5–60V) and delivers stable –12V output across –40°C to +85°C ambient - no derating required. |
| Telecom Line Card Interface | Test Equipment Negative Rail |
Use Scenario: Creating –48V auxiliary bias for line interface circuits (LICs) in access switches and ONU units. IC Role / Device Role / Timing Role: High-efficiency inverting controller synchronized to system clock (75–750kHz) to minimize conducted EMI. Use Value: Phase-lockable architecture avoids beat frequencies with other converters; foldback protects during hot-swap events. |
Use Scenario: Supplying –15V/1A for dual-supply op-amps and DACs in automated test equipment (ATE) channel cards. IC Role / Device Role / Timing Role: Precision inverting regulator with programmable soft-start and output tracking to prevent latch-up during power sequencing. Use Value: Internal 10µA SS current source enables accurate timing control; 0.800V VREF accuracy (±1.1%) ensures tight output regulation. |
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 |
|---|---|---|---|
| LTC3864MPDE#PBF | Non-inverting buck-only architecture; lacks VFBN pin and inverting feedback capability. | Cannot generate negative outputs; suited only for positive step-down applications. | Select only when negative output is not required - offers identical package, temp grade, and feature set for buck topologies. |
| LM5180QPWPRQ1 | Current-mode synchronous buck controller; 65V max input; no native inverting support; requires external inverting stage. | Needs additional components (op-amp, transistor) to achieve negative output; higher BOM cost and layout complexity. | Choose if AEC-Q100 qualification is mandatory and negative output can be derived externally - LM5180QPWPRQ1 is automotive-grade but not functionally equivalent. |
Compared with LTC3863MPDE#PBF, LTC3864MPDE#PBF removes inverting capability but retains identical thermal performance and extended temperature operation, while LM5180QPWPRQ1 adds AEC-Q100 compliance at the cost of requiring external circuitry for negative rails - making LTC3863MPDE#PBF the only single-chip solution for high-reliability inverting conversion in extreme environments.
Availability
LTC3863MPDE#PBF is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial sensor transmitters, and telecom line card power supplies requiring stable component supply across extended temperature and long product lifecycles.
Supply support for LTC3863MPDE#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 LTC3863 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 where reliability, wide input range, and extended temperature operation are critical.
FAQ
What is the maximum negative output voltage achievable with the LTC3863MPDE#PBF?
The LTC3863MPDE#PBF supports negative output voltages from –0.4V up to beyond –150V, limited only by external component ratings (MOSFET VDS, diode reverse voltage, capacitor WV). The datasheet confirms –150V as typical; higher values are feasible with appropriately rated passive components and careful layout for voltage isolation.
Does the LTC3863MPDE#PBF require an external Schottky diode, and why?
Yes, the LTC3863MPDE#PBF requires an external Schottky catch diode (e.g., B540C in the typical application) because it is a nonsynchronous inverting controller. The diode provides the commutation path for inductor current when the external P-MOSFET is off, completing the energy transfer loop and enabling negative output generation without a second active switch.
How does the LTC3863MPDE#PBF handle short-circuit conditions?
Under short-circuit, the LTC3863MPDE#PBF activates frequency foldback when VFB drops below 0.4V, reducing switching frequency to ~18% of the programmed value. Combined with fixed 95mV current limit, this limits average output current and power dissipation, preventing thermal runaway while maintaining controller functionality for automatic recovery.
Can the LTC3863MPDE#PBF be used in non-inverting buck configuration?
Yes - by pulling VFBN >2V (but <5V), the internal inverting amplifier is disabled, allowing the LTC3863MPDE#PBF to operate as a standard buck controller. In this mode, feedback is applied directly to VFB using a resistor divider to SGND, and output voltage equals (RFB1+RFB2)/RFB2 × 0.8V.
What is the significance of the exposed PGND pad (Pin 13) on the LTC3863MPDE#PBF DFN package?
The exposed PGND pad (Pin 13) serves as both the primary power ground return and thermal conduction path. It must be soldered to a PCB copper pour to achieve the specified θJA = 43°C/W and ensure safe operation at full load. Leaving it unconnected degrades thermal performance and may cause premature thermal shutdown or reliability issues.
LTC3863MPDE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 12-WFDFN 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-DFN (4x3)
LTC3863MPDE#PBF FAQ
1.How can I place an order for LTC3863MPDE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3863MPDE#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 LTC3863MPDE#PBF reliable?
The price and inventory of LTC3863MPDE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3863MPDE#PBF is usually 5 days.
3.What payment methods are accepted for LTC3863MPDE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3863MPDE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3863MPDE#PBF?
LTC3863MPDE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3863MPDE#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 LTC3863MPDE#PBF?
For technical support, including LTC3863MPDE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3863MPDE#PBF requirements.
6.How does Aetrix verify that LTC3863MPDE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3863MPDE#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 LTC3863MPDE#PBF meets industry standards.
7.What is the process for return or replacement of LTC3863MPDE#PBF?
All LTC3863MPDE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3863MPDE#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 LTC3863MPDE#PBF part is unused and in its original packaging.
Return procedure for LTC3863MPDE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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