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Analog Devices Inc. LT8331IMSE#WPBF
- Part No.:
- LT8331IMSE#WPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width), 12 Leads, Exposed Pad
- Datasheet:
-
LT8331IMSE#WPBF.pdf
- Description:
- IC REG BOOST FLYBACK ADJ 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:235
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Product details
Overview
LT8331IMSE#WPBF 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 6µA quiescent current in Burst Mode, and features programmable 100kHz–500kHz switching frequency-ideal for automotive 48V telecom power supplies requiring high-voltage isolation and low-noise regulation.
For engineers reviewing the LT8331IMSE#WPBF datasheet, LT8331IMSE#WPBF pinout, LT8331IMSE#WPBF application, or LT8331IMSE#WPBF equivalent, key selection considerations include its AEC-Q100 qualification, 140V switch rating, thermally enhanced MSOP-16EP package with 4 pins removed, BIAS pin for efficiency optimization, and dual-mode (Burst/Pulse-Skipping) operation via SYNC/MODE pin control.
Technical Context
The LT8331IMSE#WPBF implements fixed-frequency current-mode control with internal compensation, enabling stable operation across wide VIN (4.5V–100V) and VOUT ranges. Its dual-error-amplifier architecture automatically selects between +1.60V or –0.80V internal references based on FBX polarity, supporting both positive and negative output configurations without external reconfiguration.
Frequency foldback activates when FBX approaches 0V (e.g., during start-up or fault), reducing fSW to maintain controllable duty cycle under low-VOUT conditions. The SYNC/MODE pin provides three distinct operational modes: ground for Burst Mode (6µA IQ), INTVCC for pulse-skipping, or external clock input (100kHz–625kHz) for synchronization-each altering switching behavior, ripple profile, and light-load efficiency trade-offs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 100V - supports direct connection to automotive battery rails, industrial 48V systems, and telecom rectified inputs without pre-regulation. |
| Switch Rating | 140V, 0.5A - enables high-step-up ratios (e.g., 12V→48V) and flyback/SEPIC isolation up to 140V breakdown margin. |
| Quiescent Current | 6µA in Burst Mode - sustains >90% efficiency at <10mA load, critical for always-on automotive modules and battery-backed medical sensors. |
| Switching Frequency | 100kHz to 500kHz (programmable via RT resistor) - balances EMI filtering size, transformer core loss, and MOSFET switching loss for compact high-density designs. |
| Feedback Reference | +1.60V or –0.80V (auto-selected) - allows single-resistor-divider programming of both positive and negative outputs without topology change or component swap. |
| BIAS Pin Function | Accepts 4.4V–(VIN–0.4V) supply - offloads INTVCC regulator current from VIN, improving full-load efficiency by up to 3% in SEPIC/flyback where VOUT ≈ VIN. |
| Operating Temp Range | –40°C to +125°C junction - validated for under-hood automotive environments and industrial control cabinets per AEC-Q100 Grade 1. |
Pinout & Package
The LT8331IMSE#WPBF is housed in a thermally enhanced 16-lead plastic MSOP package with 4 pins removed (pins 2, 4, 13, 15) to ensure ≥8mm creepage/clearance for high-voltage isolation. The exposed pad (Pin 17) is PGND/GND and must be soldered to a continuous PCB copper plane for thermal dissipation (θJC = 10°C/W).
| 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 with resistor divider. |
| VIN (3) | Main Input Supply | 4.5V–100V input path powering internal circuitry and switch - requires local 10µF ceramic bypass placed adjacent to pin and exposed pad. |
| INTVCC (5) | Internally Regulated 3.2V Supply | Powers gate drivers and logic - must be bypassed with ≥1µF low-ESR ceramic; no external loading permitted. |
| BIAS (7) | Secondary Supply for INTVCC | When 4.4V ≤ BIAS ≤ (VIN–0.4V), powers INTVCC instead of VIN - reduces input current draw and improves efficiency in VOUT≈VIN topologies. |
| FBX (9) | Single Feedback Pin | Auto-detects polarity: pulls to +1.60V reference for positive outputs, –0.80V for negative - eliminates need for topology-specific feedback networks. |
| RT (10) | Frequency Programming Input | Resistor to GND sets fSW from 100kHz to 500kHz - enables EMI tuning and magnetics optimization without changing IC. |
| SS (11) | Soft-Start Control | 2µA constant-current charge into external capacitor - controls inductor current ramp rate to prevent saturation and overshoot during startup/fault recovery. |
| SYNC/MODE (12) | Mode Selection & Clock Sync | Ground = Burst Mode (6µA IQ); INTVCC = Pulse-Skipping; external square wave = synchronized operation - defines light-load behavior and timing alignment. |
| SW1, SW2 (14, 16) | Power Switch Terminals | Drain and source connections of internal 140V/0.5A MOSFET - require minimal trace area and tight layout to minimize EMI and parasitic ringing. |
| PGND/GND (17) | Power & Signal Ground | Exposed pad serving as primary thermal path and return for high-current switch paths - must be solid-soldered to ≥2-layer ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Qualified | Validated for automotive applications including engine control units and ADAS power rails - meets stress test requirements for temperature cycling, HTRB, and ESD. |
| Single-Pin Output Polarity Selection | FBX pin automatically configures error amplifier for +1.60V or –0.80V reference - eliminates manual jumpering or board variants for bipolar output designs. |
| Frequency Foldback Protection | Reduces switching frequency when FBX ≈ 0V (e.g., short-circuit or soft-start) - prevents inductor current runaway by extending off-time to maintain controllable duty cycle. |
| Programmable UVLO Threshold | EN/UVLO pin accepts resistor divider to set custom turn-on/turn-off voltages - enables system-level brownout hysteresis matching battery voltage profiles. |
| Thermally Enhanced HV MSOP | 16-lead MSOP with 4 pins removed and exposed PGND pad - achieves θJA = 45°C/W while maintaining >8mm creepage for 100V+ isolation compliance. |
Applications
| Automotive 48V DC-DC Conversion | Industrial Telecom Power Supply |
|---|---|
Use Scenario: Step-up conversion from 12V/24V battery to regulated 48V rail for camera modules, radar sensors, and infotainment subsystems in vehicles with 48V mild-hybrid architectures. IC Role / Device Role / Timing Role: Primary regulating controller implementing SEPIC topology to provide galvanically isolated, tightly regulated 48V output with reverse-polarity protection and cold-crank immunity. Use Value: 6µA quiescent current extends battery standby time; AEC-Q100 qualification ensures reliability over 15-year vehicle lifetime; 140V switch withstands load-dump transients up to ±120V. | Use Scenario: Generating isolated ±15V and +5V auxiliary rails from a 48V telecom backplane for op-amps, ADCs, and interface ICs in base station equipment. IC Role / Device Role / Timing Role: Dual-output flyback controller using single LT8331IMSE#WPBF with transformer-coupled secondary windings and independent FBX feedback networks. Use Value: Single-FBX architecture simplifies design of multi-rail isolated supplies; programmable 100kHz–500kHz frequency avoids sensitive RF bands; BIAS pin improves efficiency when VOUT ≈ VIN. |
| Medical Diagnostic Imaging | Portable Test Equipment |
Use Scenario: High-voltage bias supply for photomultiplier tubes (PMTs) and avalanche photodiodes (APDs) in portable ultrasound and X-ray detectors requiring low-noise, stable ±100V outputs. IC Role / Device Role / Timing Role: Inverting flyback controller generating negative high-voltage output with precision regulation via FBX feedback referenced to isolated ground. Use Value: –0.80V internal reference enables accurate high-gain feedback for sub-0.1% output stability; Burst Mode maintains ultra-low ripple (<20mV) at microamp loads during signal acquisition. | Use Scenario: Compact, battery-operated handheld oscilloscopes and multimeters needing isolated analog front-end supplies from a single-cell Li-ion (2.7V–4.2V) input. IC Role / Device Role / Timing Role: Boost converter with integrated 140V switch enabling direct step-up to 12V/±15V without external MOSFET - reducing bill-of-materials and PCB area. Use Value: 4.5V minimum input allows operation down to near-dead battery; 6µA IQ extends runtime between charges; thermally enhanced MSOP fits tight enclosures without heatsinks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar DC/DC controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3891EMSE#PBF | Higher 60V max VIN, dual-phase synchronous buck controller; no integrated switch; requires external MOSFETs. | Optimized for high-current (>10A) buck conversion, not high-voltage isolated topologies. | Select LTC3891EMSE#PBF only when designing high-efficiency, high-power buck regulators with external FETs and VIN < 60V. |
| LM5165QPWPRQ1 | Lower 65V max VIN, 150mA integrated switch, fixed 600kHz frequency, no BIAS pin or frequency foldback. | Targeted at low-power, cost-sensitive automotive buck supplies - lacks 140V capability and multi-topology flexibility. | Choose LM5165QPWPRQ1 for simple 5V/3.3V point-of-load regulation where 140V isolation and ultralow IQ are unnecessary. |
Compared with LTC3891EMSE#PBF and LM5165QPWPRQ1, the LT8331IMSE#WPBF uniquely combines 140V integrated switching, single-pin topology selection, 6µA Burst Mode IQ, and AEC-Q100 qualification - making it the only option for compact, high-reliability, high-voltage isolated DC/DC conversion in space-constrained automotive and industrial systems.
Availability
LT8331IMSE#WPBF is available at Aetrix Electronics and suitable for automotive ADAS power supplies, industrial 48V telecom infrastructure, and portable medical diagnostic equipment requiring stable component supply with guaranteed long-term availability and automotive-grade traceability.
Supply support for LT8331IMSE#WPBF 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 industrial, automotive, communications, and healthcare markets.
The LT8331 product line delivers high-voltage, low-quiescent-current DC/DC controllers for demanding applications including automotive 48V systems, isolated telecom supplies, and portable instrumentation - emphasizing integration, reliability, and ease of use in harsh environments.
FAQ
What is the maximum input voltage rating for the LT8331IMSE#WPBF?
The LT8331IMSE#WPBF has an absolute maximum input voltage rating of 100V on the VIN pin, with recommended continuous operating range from 4.5V to 100V. This enables direct interface with automotive 48V systems, industrial 24V/48V rails, and telecom rectified inputs without external pre-regulation stages. Exceeding 100V may cause permanent damage per Absolute Maximum Ratings.
Does the LT8331IMSE#WPBF support both positive and negative output voltages?
Yes, the LT8331IMSE#WPBF supports both polarities using its single FBX pin: it auto-selects a +1.60V internal reference for positive outputs (e.g., boost, SEPIC, flyback) or a –0.80V reference for negative outputs (e.g., inverting configuration). No external component changes or pin reconfiguration are required - the topology is determined solely by the FBX voltage polarity and external circuit.
How does the BIAS pin improve efficiency in the LT8331IMSE#WPBF?
The BIAS pin on the LT8331IMSE#WPBF accepts a second supply (4.4V ≤ BIAS ≤ VIN – 0.4V) to power the internal INTVCC regulator, diverting that current away from the main VIN rail. In SEPIC or flyback topologies where VOUT ≈ VIN, connecting BIAS to VOUT reduces total input current draw and improves full-load efficiency by up to 3%, as confirmed in typical performance data.
What is the purpose of frequency foldback in the LT8331IMSE#WPBF?
Frequency foldback in the LT8331IMSE#WPBF reduces switching frequency when the FBX pin voltage approaches 0V - such as during start-up, output short-circuit, or heavy overload. This extends the minimum off-time, preventing inductor current runaway caused by insufficient off-time at very low duty cycles, thereby maintaining control and protecting external components without requiring external fault circuitry.
Is the LT8331IMSE#WPBF pin-compatible with other members of the LT8331 family?
Yes, the LT8331IMSE#WPBF shares identical pinout, package (MSOP-16EP), and electrical characteristics with LT8331EMSE#WPBF, LT8331IMSE#PBF, and LT8331EMSE#PBF. The "I" grade denotes –40°C to +125°C operation, "E" grade is 0°C to +125°C, and "W" suffix indicates AEC-Q100 automotive qualification - all use the same footprint and interconnect.
LT8331IMSE#WPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-TFSOP (0.118", 3.00mm Width), 12 Leads, Exposed Pad
- Packaging:
- Tube
- 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#WPBF FAQ
1.How can I place an order for LT8331IMSE#WPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8331IMSE#WPBF 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#WPBF reliable?
The price and inventory of LT8331IMSE#WPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8331IMSE#WPBF is usually 5 days.
3.What payment methods are accepted for LT8331IMSE#WPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8331IMSE#WPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8331IMSE#WPBF?
LT8331IMSE#WPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8331IMSE#WPBF 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#WPBF?
For technical support, including LT8331IMSE#WPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8331IMSE#WPBF requirements.
6.How does Aetrix verify that LT8331IMSE#WPBF is sourced from the original manufacturer or authorized distributors?
All LT8331IMSE#WPBF 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#WPBF meets industry standards.
7.What is the process for return or replacement of LT8331IMSE#WPBF?
All LT8331IMSE#WPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8331IMSE#WPBF, 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#WPBF part is unused and in its original packaging.
Return procedure for LT8331IMSE#WPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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