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Analog Devices Inc. LT8331IMSE#WTRPBF
- Part No.:
- LT8331IMSE#WTRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width), 12 Leads, Exposed Pad
- Datasheet:
-
LT8331IMSE#WTRPBF.pdf
- Description:
- IC REG BOOST FLYBACK ADJ 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,363
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Product details
Overview
LT8331IMSE#WTRPBF from Analog Devices is a current-mode DC/DC converter IC with a 140V, 0.5A integrated power switch, operating from 4.5V to 100V input. It supports boost, SEPIC, flyback, and inverting topologies using a single FBX feedback pin, delivers 48V output in typical SEPIC configurations, and achieves 6µA quiescent current in Burst Mode for ultra-low-power industrial and automotive power supplies.
For engineers reviewing the LT8331IMSE#WTRPBF datasheet, LT8331IMSE#WTRPBF pinout, LT8331IMSE#WTRPBF application, or LT8331IMSE#WTRPBF equivalent, key selection considerations include its AEC-Q100 qualification, programmable 100–500kHz switching frequency, BIAS pin for efficiency optimization, ±0.8V/1.6V dual-polarity FBX regulation, and thermally enhanced MSOP-16EP package with high-voltage spacing.
Technical Context
The LT8331IMSE#WTRPBF implements fixed-frequency current-mode control with internal compensation, enabling stable operation across wide VIN (4.5V–100V) and VOUT ranges. Its dual-regulation FBX architecture-1.60V for positive outputs and –0.80V for negative outputs-supports topology reconfiguration without hardware changes.
It integrates frequency foldback during low-VOUT faults, programmable soft-start via SS pin (2µA charge current), and three SYNC/MODE states: Burst Mode (SYNC < 0.6V), pulse-skipping (SYNC > 2.4V), or external clock synchronization (0.6V < SYNC < 2.4V). The BIAS pin supplies INTVCC when 4.4V ≤ BIAS ≤ VIN – 0.4V, reducing VIN load and improving full-load efficiency.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 100V - supports wide-range industrial rails, 48V telecom, and automotive battery transients. |
| Switch Rating | 140V, 0.5A - enables 48V SEPIC designs with margin for voltage spikes and flyback isolation. |
| Quiescent Current | 6µA in Burst Mode - sustains micropower operation in always-on systems like telematics or sensor nodes. |
| FBX Regulation | +1.60V or –0.80V - single-pin polarity selection eliminates external op-amps for inverting or boosting. |
| Switching Frequency | 100kHz to 500kHz (RT-programmable) - balances EMI, size, and efficiency; supports synchronization to external clocks. |
| Operating Temp | –40°C to +125°C junction - qualified per AEC-Q100 Grade I, suitable for under-hood and industrial environments. |
| Package | 16-Lead MSOP with 4 pins removed (MSE16) - exposed PGND pad enhances thermal dissipation (θJC = 10°C/W). |
Pinout & Package
The LT8331IMSE#WTRPBF uses a thermally enhanced 16-lead MSOP package (MSE16 variant) with four pins removed (Pins 2, 4, 13, 15) to ensure ≥0.3mm creepage/clearance for high-voltage isolation. The exposed pad (Pin 17) is PGND/GND and must be soldered to a continuous PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN/UVLO (1) | Enable / Undervoltage Lockout Input | 1.6V falling threshold disables switching; 1.74V rising threshold resumes operation - enables precise system-level brownout protection. |
| VIN (3) | Main Input Supply | Accepts 4.5V–100V; powers internal circuitry unless BIAS is active - requires local low-ESR ceramic bypass near PGND. |
| INTVCC (5) | Internal 3.2V Regulator Output | Supplies gate drivers and logic; must be bypassed with ≥1µF ceramic capacitor - not externally loaded. |
| BIAS (7) | Secondary Input for INTVCC | When 4.4V ≤ BIAS ≤ VIN–0.4V, powers INTVCC - reduces VIN current draw and improves efficiency in SEPIC/flyback. |
| FBX (9) | Feedback Pin | Regulates to +1.60V (boost/SEPIC/flyback) or –0.80V (inverting) - enables topology flexibility with one resistor divider. |
| RT (10) | Frequency Programming Input | Resistor to GND sets fSW from 100kHz–500kHz - allows EMI tuning and inductor size optimization. |
| SS (11) | Soft-Start Control | 2µA current charges external capacitor - controls inrush current and prevents inductor saturation at startup. |
| SYNC/MODE (12) | Mode Selection & Clock Sync | GND = Burst Mode; INTVCC = pulse-skipping; external square wave = synchronization - selects light-load behavior. |
| SW1, SW2 (14, 16) | Power Switch Outputs | Drives external inductors/diodes; low RDS(ON) (1.7Ω typ.) minimizes conduction loss - minimize trace area for EMI. |
| PGND/GND (17) | Power & Signal Ground | Exposed thermal pad; primary heat path and reference for all grounds - must be solid-soldered to large copper area. |
Key Features
| Feature | Design Value |
|---|---|
| Single FBX Pin Topology Flexibility | Supports boost, SEPIC, flyback, and inverting configurations without external op-amps or topology-specific ICs. |
| Burst Mode with 6µA IQ | Maintains regulation while drawing only 6µA from VIN - extends battery life in always-on automotive sensors and IoT edge nodes. |
| Programmable UVLO via EN/UVLO | Resistive divider sets precise turn-on/off thresholds (e.g., 36V–60V for 48V systems) with 140mV hysteresis. |
| Thermally Optimized High-Voltage MSOP | 16-lead MSE package with 4 pins removed and exposed PGND pad achieves θJA = 45°C/W - enables 1.5W+ power in compact layouts. |
| Internal Compensation & Fault Protection | No external compensation required; includes overcurrent (>1.15A), thermal lockout (>170°C), and INTVCC UVLO protection. |
Applications
| Automotive Telematics Power Supply | Industrial 48V Rail Generator |
|---|---|
|
Use Scenario: Powers LTE modems and GNSS receivers from vehicle battery (9V–16V) with transient immunity up to 100V. IC Role / Device Role / Timing Role: Primary DC/DC controller implementing SEPIC topology to maintain regulated 48V output during cold-crank and load-dump events. Use Value: AEC-Q100 qualification, 140V switch rating, and 6µA Burst Mode IQ ensure reliable operation and extended battery runtime in parked monitoring mode. |
Use Scenario: Generates isolated 48V auxiliary rail from 24V industrial PLC backplane for PoE or sensor interfaces. IC Role / Device Role / Timing Role: Flyback controller delivering 150mA at 48V with BIAS pin connected to secondary-side rectifier for improved efficiency. Use Value: Programmable 450kHz switching (RT = 56.2kΩ) enables small magnetics; internal compensation simplifies design validation. |
| Portable Medical Imaging Bias Supply | Negative Rail Generator for Precision ADCs |
|
Use Scenario: Supplies ±15V bias for CCD/CMOS image sensor analog front-ends in handheld ultrasound devices. IC Role / Device Role / Timing Role: Inverting converter generating –15V from 3.6V Li-ion battery using single FBX pin configured for –0.80V regulation. Use Value: Ultralow 6µA quiescent current preserves battery life between imaging sessions; soft-start prevents sensor latch-up during power-up. |
Use Scenario: Creates clean –5V rail for SAR ADC reference buffers and op-amp biasing in data acquisition modules. IC Role / Device Role / Timing Role: Inverting regulator with low-noise Burst Mode operation and 20mVpp output ripple at light loads. Use Value: Dual-regulation FBX pin eliminates need for separate inverting IC; MSOP thermal pad maintains stability during extended conversions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar DC/DC controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3631EMSE#PBF | 60V max VIN, 1.2A switch, no BIAS pin, fixed 1MHz fSW - higher current but narrower input range and no topology flexibility. | Suitable for lower-voltage, higher-current boost applications (e.g., 12V→24V), but cannot replace LT8331IMSE#WTRPBF in 100V-input or inverting designs. | Select only if input stays below 60V and topology is fixed boost; verify thermal performance without BIAS efficiency gain. |
| MAX25203ATPA/VY+ | AEC-Q100, 65V max VIN, 0.6A switch, integrated MOSFETs, no FBX polarity switching - lacks inverting/SEPIC capability and programmable frequency. | Targets simpler automotive buck-boost applications (e.g., infotainment USB-PD), not high-voltage or bipolar-output systems. | Use only for cost-sensitive, fixed-topology 12V/24V systems where dual-polarity regulation and 100V tolerance are unnecessary. |
Compared with LTC3631EMSE#PBF and MAX25203ATPA/VY+, the LT8331IMSE#WTRPBF uniquely combines 100V input tolerance, 140V switch, single-pin topology selection, and AEC-Q100 qualification - making it the only option for automotive or industrial 48V+ SEPIC/flyback/inverting converters requiring ultralow IQ.
Availability
LT8331IMSE#WTRPBF is available at Aetrix Electronics and suitable for automotive telematics, industrial 48V power generation, and portable medical imaging systems requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant sourcing.
Supply support for LT8331IMSE#WTRPBF 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 LT8331 product line delivers high-voltage, low-IQ DC/DC controllers for demanding applications including automotive subsystems, industrial power supplies, and portable instrumentation - emphasizing reliability, topology flexibility, and thermal robustness.
FAQ
What is the maximum input voltage supported by the LT8331IMSE#WTRPBF?
The LT8331IMSE#WTRPBF supports an absolute maximum input voltage of 100V on the VIN pin, with guaranteed operation from 4.5V to 100V. This wide range enables use in 48V telecom systems, automotive battery monitoring with load-dump protection, and industrial 24V/48V rails with significant transients. Exceeding 100V risks permanent damage per Absolute Maximum Ratings.
Does the LT8331IMSE#WTRPBF support negative output voltage generation?
Yes, the LT8331IMSE#WTRPBF supports negative output voltages via inverting topology using the same FBX pin, which regulates to –0.80V (not +1.60V) when the output is inverted. This is confirmed in Electrical Characteristics (FBX Regulation) and Applications Information, enabling single-component solutions for dual-rail systems without external amplifiers.
How does the BIAS pin improve efficiency in the LT8331IMSE#WTRPBF?
The BIAS pin on the LT8331IMSE#WTRPBF supplies the INTVCC regulator when 4.4V ≤ BIAS ≤ VIN – 0.4V, diverting up to ~800µA from VIN. In SEPIC or flyback designs where VOUT ≈ VIN or VOUT < VIN, connecting BIAS to VOUT reduces total input current and improves full-load efficiency by 2–4% - verified in Typical Performance Characteristics (G11/G12).
Is the LT8331IMSE#WTRPBF pin-compatible with other LT8331 variants?
Yes, the LT8331IMSE#WTRPBF shares identical pinout, package (MSOP-16EP), and footprint with all LT8331 variants (e.g., LT8331EMSE#PBF, LT8331IMSE#TRPBF). The "W" suffix denotes AEC-Q100 qualification and enhanced process controls, but mechanical and electrical interface compatibility is maintained across the family per Order Information table.
What protection features are integrated into the LT8331IMSE#WTRPBF?
The LT8331IMSE#WTRPBF integrates overcurrent protection (switch current > 1.15A triggers immediate shutdown), thermal lockout (>170°C junction halts switching), INTVCC undervoltage lockout (<2.5V), EN/UVLO dropout (<1.6V), and frequency foldback during low-VOUT faults. All protections reset VC and discharge SS pin to enforce controlled soft-restart.
LT8331IMSE#WTRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-TFSOP (0.118", 3.00mm Width), 12 Leads, Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Up, Step-Up/Step-Down
- Output Configuration:
- Positive or Negative, Isolation Capable
- Topology:
- Boost, Flyback, SEPIC
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 100V
- Voltage - Output (Min/Fixed):
- 1.6V, -0.8V
- Voltage - Output (Max):
- 140V (Switch)
- Current - Output:
- 500mA (Switch)
- Frequency - Switching:
- 100kHz ~ 500kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-MSOP-EP
LT8331IMSE#WTRPBF FAQ
1.How can I place an order for LT8331IMSE#WTRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8331IMSE#WTRPBF 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 LT8331IMSE#WTRPBF reliable?
The price and inventory of LT8331IMSE#WTRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8331IMSE#WTRPBF is usually 5 days.
3.What payment methods are accepted for LT8331IMSE#WTRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8331IMSE#WTRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8331IMSE#WTRPBF?
LT8331IMSE#WTRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8331IMSE#WTRPBF 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 LT8331IMSE#WTRPBF?
For technical support, including LT8331IMSE#WTRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8331IMSE#WTRPBF requirements.
6.How does Aetrix verify that LT8331IMSE#WTRPBF is sourced from the original manufacturer or authorized distributors?
All LT8331IMSE#WTRPBF 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 LT8331IMSE#WTRPBF meets industry standards.
7.What is the process for return or replacement of LT8331IMSE#WTRPBF?
All LT8331IMSE#WTRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8331IMSE#WTRPBF, 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 LT8331IMSE#WTRPBF part is unused and in its original packaging.
Return procedure for LT8331IMSE#WTRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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