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Analog Devices Inc. LTC3863HMSE#TRPBF
- Part No.:
- LTC3863HMSE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 12-TSSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3863HMSE#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 12MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,153
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Product details
Overview
LTC3863HMSE#TRPBF from Analog Devices is a high-voltage, low-quiescent-current inverting DC/DC PMOS controller for automotive and industrial negative power rails. It drives an external P-channel MOSFET to generate regulated negative outputs from –0.4V to –150V, operates from 3.5V–60V input, draws only 70µA in Burst Mode, and supports programmable switching frequency from 50kHz to 850kHz. It is used in telecom distributed supplies requiring robust fault protection and wide temperature operation.
For engineers reviewing the LTC3863HMSE#TRPBF datasheet, LTC3863HMSE#TRPBF pinout, LTC3863HMSE#TRPBF application, or LTC3863HMSE#TRPBF equivalent, key selection criteria include its –40°C to 150°C junction temperature rating, 12-lead MSOP package with exposed PGND pad, inverting topology support, frequency foldback under short-circuit, and dual light-load modes (Burst Mode vs. pulse-skipping).
Technical Context
The LTC3863HMSE#TRPBF implements peak current mode control with a constant-frequency PWM architecture, using an internal transconductance error amplifier (1.8mS) and slope compensation to stabilize inductor current regulation. Its inverting feedback architecture relies on VFBN and VFB pins to sense negative output voltage via resistor divider, enabling precise regulation of VOUT = –(RFB1/RFB2) × 0.8V.
It integrates a dedicated gate bias LDO (VIN–VCAP) regulated to 8V (typ.) for strong P-MOSFET drive, with UVLO triggered at VIN–VCAP < 3.25V (typ.). Fault protection includes overvoltage lockout (10% VFB threshold), cycle-by-cycle current limiting (95mV sense threshold), and automatic frequency foldback below VFB = 0.4V - scaling foldback % to programmed fSW.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5V to 60V - supports 12V/24V/48V automotive and industrial bus inputs without pre-regulation. |
| Negative Output Range | –0.4V to –150V - enables wide-range bias, op-amp supply, and telecom interface rails. |
| Quiescent Current (Burst Mode) | 70µA - sustains ultra-low-power standby in always-on systems without battery drain. |
| Switching Frequency Range | 50kHz to 850kHz - adjustable via FREQ pin resistor; allows EMI optimization and inductor size trade-offs. |
| Current Limit Threshold | 95mV (typ.) across RSENSE - sets accurate 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. |
| Gate Driver Bias (VIN–VCAP) | 8.0V (typ.) - ensures full enhancement of high-voltage P-MOSFETs with minimal RDS(on) penalty. |
Pinout & Package
Package: 12-lead plastic MSOP with exposed thermal pad (Pin 13 = PGND), rated for θJA = 40°C/W and TJMAX = 150°C. Exposed pad must be soldered to PCB for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PGND (Pin 13) | Power Ground Reference | Exposed thermal pad tied to system power ground; mandatory for thermal performance and noise isolation. |
| GATE (Pin 12) | P-MOSFET Gate Drive Output | High-current source/sink driver for external P-channel switch; biased by internal 8V LDO (VIN–VCAP). |
| VIN (Pin 11) | Main Power Supply Input | Supplies IC core and gate driver; requires ≥0.1µF ceramic bypass to PGND near pin. |
| SENSE (Pin 10) | Current Sense Input | Differential input measuring voltage across RSENSE (VIN–SENSE); sets peak current limit at 95mV. |
| CAP (Pin 9) | Gate Driver Bias Capacitor Node | Connection point for ≥0.1µF low-ESR ceramic capacitor to VIN; stabilizes internal VCAP LDO. |
| RUN (Pin 8) | Enable/Shutdown Control | Logic-compatible input; >1.26V enables operation; pulls up internally to ~3.3V; accepts up to 60V. |
| VFBN (Pin 7) | Inverting Feedback Reference | Connects to center of RFB1/RFB2 divider; enables negative-output sensing; disable by pulling >2V. |
| ITH (Pin 6) | Error Amplifier Output / Compensation | Controller compensation node (0–2.9V range); connects to RC network for loop stability. |
| VFB (Pin 5) | Feedback Reference Input | Regulated to 0.800V (±1.1%); determines output voltage via external resistor divider. |
| 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 fSW from 50kHz–850kHz or fixed 350/535kHz. |
| PLLIN/MODE (Pin 1) | Sync Clock Input / Light-Load Mode Select | Floating = Burst Mode (70µA IQ); grounded = pulse-skipping; driven = PLL sync (75–750kHz). |
Key Features
| Feature | Design Value |
|---|---|
| Programmable Burst Mode Operation | Reduces IQ to 70µA at light loads while maintaining regulation-critical for battery-backed systems. |
| Frequency Foldback Protection | Automatically scales switching frequency down to ~18% of setpoint when VFB < 0.4V, limiting inrush and short-circuit energy. |
| Verified Adjacent Pin FMEA | Guaranteed safe operation under open/short faults between neighboring pins-required for ASIL-B automotive designs. |
| Accurate 0.800V Feedback Reference | ±1.1% initial accuracy over temperature ensures stable output regulation without calibration. |
| Strong Gate Driver with 8V Bias | Delivers fast turn-on/turn-off of high-VDS P-MOSFETs; RUP = 2Ω, RDN = 0.9Ω minimizes switching losses. |
| Programmable Soft-Start or Tracking | Enables controlled ramp-up or coordinated sequencing with other rails-prevents inrush and latch-up. |
Applications
| Automotive Infotainment Power | Industrial Sensor Bias Supply |
|---|---|
Use Scenario: Generating –5V rail for analog front-end amplifiers and ADC drivers in vehicle head units. IC Role / Device Role / Timing Role: Inverting controller regulating negative output from 12V battery; manages start-up sequencing with tracking. Use Value: Enables clean, low-noise analog supply with 70µA quiescent current during sleep mode-extending battery life in parked state. |
Use Scenario: Providing –12V bias for precision current-sense op-amps in motor control feedback loops. IC Role / Device Role / Timing Role: High-voltage inverting controller operating from 24V industrial bus; uses frequency foldback during sensor fault conditions. Use Value: Delivers stable negative rail across –40°C to +150°C ambient-ensuring sensor accuracy in harsh factory environments. |
| Telecom Line Card Interface | Distributed Data Acquisition System |
Use Scenario: Creating –48V auxiliary supply for RS-485 transceivers and isolation amplifiers in base station line cards. IC Role / Device Role / Timing Role: Wide-input (3.5–60V) inverting controller driving discrete P-MOSFET; synchronized to system clock via PLLIN/MODE. Use Value: Supports EMI-compliant 750kHz sync operation and withstands 65V transient surges-meeting GR-1089-CORE requirements. |
Use Scenario: Powering multiple isolated ADC channels requiring matched ±15V rails in modular DAQ chassis. IC Role / Device Role / Timing Role: One of parallel controllers generating negative rail; soft-start coordinated via SS pin resistor divider. Use Value: Ensures simultaneous, ripple-free power-up across channels-eliminating measurement offset during system boot. |
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#TRPBF | Non-inverting buck-only topology; no VFBN pin; fixed 0.8V VFB reference only; same package/temp grade. | Cannot generate negative outputs; limited to step-down positive rails; lacks inverting feedback path. | Select only if positive-only regulation suffices and negative rail generation is unnecessary. |
| LM5180QPWPRQ1 | Automotive-grade flyback controller; integrated 100V N-MOSFET driver; no P-MOSFET gate bias LDO; different topology. | Requires transformer; supports isolated outputs; higher BOM cost; not pin-compatible or functionally substitutable. | Choose for isolated bias needs or where transformer-based design is preferred over inductor-only inverting. |
Compared with LTC3864EMSE#TRPBF and LM5180QPWPRQ1, the LTC3863HMSE#TRPBF uniquely delivers true inverting capability with single-inductor simplicity, 70µA Burst Mode IQ, and verified adjacent-pin FMEA-making it the only direct solution for high-reliability, wide-temp negative rail generation without isolation.
Availability
LTC3863HMSE#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment, industrial sensor bias, and telecom line card power supplies requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC3863HMSE#TRPBF 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, industrial, automotive, and communications markets.
The LTC3863HMSE#TRPBF belongs to Analog Devices' Power by Linear™ controller family, designed specifically for high-efficiency, high-reliability DC/DC conversion in demanding automotive and industrial environments with extended temperature and fault-tolerance requirements.
FAQ
What is the maximum allowable input voltage for the LTC3863HMSE#TRPBF?
The LTC3863HMSE#TRPBF has an absolute maximum input supply voltage (VIN) rating of 65V, with continuous operation specified from 3.5V to 60V. Operation above 60V risks exceeding internal LDO and gate driver stress limits, and the device enters undervoltage lockout below VIN–VCAP = 3.25V (typical). Always observe the 65V absolute max to prevent permanent damage.
How does the LTC3863HMSE#TRPBF achieve negative output voltage regulation?
The LTC3863HMSE#TRPBF uses an inverting feedback architecture: VFBN is connected to the center of a resistor divider between VOUT and VFB, allowing the internal error amplifier to regulate VFB–VFBN to 0.800V. This yields VOUT = –(RFB1/RFB2) × 0.800V. Pulling VFBN > 2V disables inversion, converting LTC3863HMSE#TRPBF into a standard buck controller.
What is the purpose of the exposed pad (Pin 13) on the LTC3863HMSE#TRPBF MSOP package?
The exposed pad (Pin 13) on the LTC3863HMSE#TRPBF is designated PGND and serves as both the primary power ground return and thermal conduction path. It must be soldered to a large PCB copper area to achieve the specified θJA = 40°C/W and ensure reliable operation at 150°C junction temperature. Failure to connect it compromises thermal performance and noise immunity.
Can the LTC3863HMSE#TRPBF synchronize its switching frequency to an external clock?
Yes - the LTC3863HMSE#TRPBF supports phase-lockable synchronization via the PLLIN/MODE pin. When driven with a clean CMOS clock (0.5V LO / 2V HI), it locks the GATE turn-on edge to the rising edge of the external signal across 75kHz–750kHz. The internal oscillator's default frequency (set by FREQ pin) must be within ~20% of the sync frequency for rapid lock acquisition.
What happens during output short-circuit conditions on the LTC3863HMSE#TRPBF?
Under short-circuit, the LTC3863HMSE#TRPBF activates frequency foldback when VFB drops below 0.4V, reducing switching frequency to ~18% of the programmed value. Simultaneously, cycle-by-cycle current limiting holds peak inductor current at 95mV/RSENSE. These dual protections limit power dissipation and prevent thermal runaway without requiring external circuitry.
LTC3863HMSE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 12-TSSOP (0.118", 3.00mm Width) Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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#TRPBF FAQ
1.How can I place an order for LTC3863HMSE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3863HMSE#TRPBF 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#TRPBF reliable?
The price and inventory of LTC3863HMSE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3863HMSE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3863HMSE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3863HMSE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3863HMSE#TRPBF?
LTC3863HMSE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3863HMSE#TRPBF 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#TRPBF?
For technical support, including LTC3863HMSE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3863HMSE#TRPBF requirements.
6.How does Aetrix verify that LTC3863HMSE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3863HMSE#TRPBF 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#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3863HMSE#TRPBF?
All LTC3863HMSE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3863HMSE#TRPBF, 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#TRPBF part is unused and in its original packaging.
Return procedure for LTC3863HMSE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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