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Analog Devices Inc. LT8331EMSE#PBF
- Part No.:
- LT8331EMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width), 12 Leads, Exposed Pad
- Datasheet:
-
LT8331EMSE#PBF.pdf
- Description:
- IC REG BOOST FLYBACK ADJ 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:6,222
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Product details
Overview
LT8331EMSE#PBF 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 via 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 LT8331EMSE#PBF datasheet, LT8331EMSE#PBF pinout, LT8331EMSE#PBF application, or LT8331EMSE#PBF equivalent, this page provides verified topology flexibility (positive/negative output), programmable 100–500kHz switching, BIAS-pin efficiency optimization, AEC-Q100 qualification, and thermal lockout protection - all critical for high-voltage, low-IQ embedded power design.
Technical Context
The LT8331EMSE#PBF implements fixed-frequency current-mode control with internal compensation, enabling stable operation across 4.5V–100V input and wide output voltage ranges. Its dual-amplifier FBX architecture (1.60V for positive outputs, –0.80V for negative) enables topology selection without external reconfiguration.
It integrates frequency foldback during low-VOUT conditions, programmable soft-start (2µA charge current), and three SYNC/MODE states: Burst Mode (≤6µA IQ), pulse-skipping (INTVCC tie), or external clock synchronization (100–625kHz). The BIAS pin (4.4V–VIN–0.4V) powers INTVCC to reduce VIN loading and improve full-load efficiency.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 100V - supports wide-range industrial, telecom, and automotive battery inputs without pre-regulation. |
| Switch Rating | 140V, 0.5A - enables 48V SEPIC/flyback designs up to ~190mA output at 72V input with margin. |
| Quiescent Current | 6µA in Burst Mode - sustains regulation at microamp-level loads while holding output ripple <20mV. |
| Switching Frequency | 100kHz to 500kHz (RT-programmable) - balances EMI, size, and efficiency; foldback active below 0.5V FBX. |
| Feedback Reference | +1.60V or –0.80V on FBX pin - selects boost/SEPIC/flyback (+VOUT) or inverting (–VOUT) topology with one resistor divider. |
| Operating Temp Range | –40°C to +125°C - qualified per AEC-Q100 Grade 1, suitable for under-hood and industrial environments. |
| Package | 16-lead MSOP with 4 pins removed - thermally enhanced layout with exposed PGND/GND pad (θJA = 45°C/W). |
Pinout & Package
The LT8331EMSE#PBF uses a thermally enhanced 16-lead MSOP package (MSE16 variation) with pins 2, 4, 13, and 15 omitted to ensure high-voltage creepage between SW1/SW2 and adjacent terminals. The exposed pad (Pin 17) is PGND/GND and must be soldered to a continuous PCB ground plane for thermal and electrical performance.
| 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 - allows precise system-level input voltage turn-on/off programming. |
| VIN (3) | Main Input Supply | Accepts 4.5V–100V; requires local low-ESR capacitor placement adjacent to exposed PGND copper for stability. |
| INTVCC (5) | Internal 3.2V Regulator Output | Supplies internal circuitry; bypassed with ≥1µF ceramic capacitor; not externally loaded. |
| BIAS (7) | Secondary Supply for INTVCC | When 4.4V ≤ VBIAS ≤ VIN–0.4V, powers INTVCC to reduce VIN current and improve efficiency. |
| FBX (9) | Topology-Agnostic Feedback Input | Regulates to +1.60V (positive VOUT) or –0.80V (negative VOUT) - eliminates need for separate reference or mode-select resistors. |
| RT (10) | Frequency Programming Input | Resistor to GND sets fSW from 100kHz to 500kHz; RT = 32.85/fSW(MHz) – 9.5 kΩ. |
| SS (11) | Soft-Start Control | 2µA constant-current charge into external capacitor controls inductor current ramp rate during startup and fault recovery. |
| SYNC/MODE (12) | Mode Selection & Clock Sync | GND = Burst Mode; INTVCC = pulse-skipping; external square wave = synchronization (100–625kHz). |
| SW1, SW2 (14, 16) | Power Switch Terminals | Drain-source path of internal 140V/0.5A MOSFET; minimal trace area required to limit EMI. |
| PGND/GND (17) | Power & Signal Ground | Exposed pad; primary thermal path and low-impedance return for SW1/SW2, VIN, and INTVCC decoupling. |
Key Features
| Feature | Design Value |
|---|---|
| Single-FB Topology Flexibility | One resistor divider configures boost, SEPIC, flyback, or inverting outputs - reduces BOM count and simplifies layout across multiple power architectures. |
| Burst Mode Efficiency | 6µA IQ with <20mV output ripple at light load - extends battery life in always-on sensors and telematics without compromising regulation. |
| BIAS-Pin Efficiency Boost | Redirects INTVCC current from VIN to BIAS supply (e.g., VOUT in flyback) - improves full-load efficiency by reducing input-side conduction loss. |
| Programmable UVLO | EN/UVLO pin accepts resistive divider to set custom turn-on/turn-off thresholds (e.g., 36V–72V telecom range) with 140mV hysteresis. |
| Integrated Fault Protection | Simultaneous detection of overcurrent (>1.15A), INTVCC UVLO (<2.5V), and thermal lockout (>170°C) - forces immediate shutdown and SS reset for robust field reliability. |
Applications
| 48V Telecom Power Supply | Automotive ADAS Camera Module |
|---|---|
Use Scenario: Generates isolated 48V rail from 12V vehicle battery for high-resolution camera imaging sensors and lens actuators. IC Role / Device Role / Timing Role: SEPIC controller delivering regulated 48V at 165mA with input transient immunity across 6V–16V cold-crank and load-dump conditions. Use Value: AEC-Q100 qualification, –40°C to +125°C operation, and 140V switch rating ensure reliable start-up and sustained output during harsh automotive transients. |
Use Scenario: Powers image signal processor (ISP) and MIPI interface in compact rear-view camera modules where board space and heat dissipation are constrained. IC Role / Device Role / Timing Role: Inverting converter generating –5V from 12V for analog front-end biasing, using single FBX pin and minimal external components. Use Value: 6µA Burst Mode IQ enables always-on wake-on-event functionality without draining the vehicle battery during extended parking periods. |
| Industrial IoT Sensor Node | Portable Medical Diagnostic Device |
Use Scenario: Supplies 24V/100mA to wireless LoRaWAN sensor nodes powered by 9V alkaline or Li-SOCl₂ primary cells. IC Role / Device Role / Timing Role: Boost converter with programmable 300kHz switching and soft-start, optimized for >10-year battery life via ultralow IQ. Use Value: High 100V input capability accommodates full cell voltage range (9V–12V); BIAS pin allows VOUT to power INTVCC, further lowering input current draw. |
Use Scenario: Provides isolated ±15V rails for precision op-amps and ADC drivers in handheld ultrasound or ECG units powered by 3.7V Li-ion batteries. IC Role / Device Role / Timing Role: Flyback controller with synchronous rectification support, leveraging FBX's dual-reference capability for bipolar output generation. Use Value: Internal compensation and frequency foldback ensure stable startup into capacitive medical loads; exposed pad enables compact thermal design in sealed enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar DC/DC controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3639EMSE#PBF | 40V max input, 1.2A switch, no BIAS pin, fixed 1.2MHz fSW; lacks 100V input and topology flexibility. | Suitable only for lower-input-voltage, higher-current boost applications; cannot replace LT8331EMSE#PBF in 48V SEPIC or automotive 6–16V systems. | Select when higher output current (≥300mA) and fixed high-frequency operation are prioritized over input range and topology versatility. |
| MAX20004AATE+T | 65V max input, 0.6A switch, 2.2MHz fSW, no FBX dual-reference; requires separate configuration for inverting vs. non-inverting outputs. | Targets compact automotive infotainment supplies; lacks Burst Mode IQ <10µA and programmable UVLO, limiting suitability for battery-backed IoT. | Choose for space-constrained 5V/12V systems needing high fSW and integrated MOSFETs, but not for 100V input or ultralow-IQ requirements. |
Compared with LTC3639EMSE#PBF and MAX20004AATE+T, the LT8331EMSE#PBF uniquely combines 100V input tolerance, 140V switch, single-pin topology selection, and 6µA Burst Mode - making it the only option for high-reliability, wide-input, low-quiescent industrial and automotive converters requiring flexible output polarity.
Availability
LT8331EMSE#PBF is available at Aetrix Electronics and suitable for industrial IoT sensor nodes, automotive ADAS camera modules, and portable medical diagnostic devices requiring stable component supply across extended temperature and voltage ranges.
Supply support for LT8331EMSE#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 is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving industrial, automotive, communications, and healthcare markets with precision, reliability, and innovation.
The LT8331 product line delivers high-voltage, ultralow-IQ DC/DC controllers for demanding applications including automotive subsystems, telecom infrastructure, and battery-powered instrumentation - emphasizing topology flexibility, thermal robustness, and AEC-Q100 compliance.
FAQ
What topologies does the LT8331EMSE#PBF support, and how is topology selected?
The LT8331EMSE#PBF supports boost, SEPIC, flyback, and inverting configurations. Topology is determined solely by the FBX feedback network: connecting FBX to a divider from a positive output sets regulation to +1.60V (boost/SEPIC/flyback), while connecting to a divider from a negative output sets regulation to –0.80V (inverting). No external mode pins or component changes are needed - the LT8331EMSE#PBF automatically adapts its internal amplifier path based on FBX voltage polarity.
How does the BIAS pin improve efficiency in the LT8331EMSE#PBF?
The BIAS pin on the LT8331EMSE#PBF supplies the internal INTVCC regulator when 4.4V ≤ VBIAS ≤ VIN–0.4V, diverting up to ~800µA from the VIN rail. In SEPIC or flyback designs where VOUT is stable and near or above 5V, connecting BIAS to VOUT reduces VIN current draw and associated conduction losses - improving full-load efficiency by 1–3% depending on input voltage and load. The LT8331EMSE#PBF datasheet confirms this behavior across temperature and line conditions.
What is the minimum output current the LT8331EMSE#PBF can regulate in Burst Mode?
The LT8331EMSE#PBF maintains regulation down to ≤1mA output current in Burst Mode, consuming only 6µA quiescent current from VIN. At 3mA load (as shown in Typical Performance Characteristic G15), output ripple remains <20mV with 4.7µF×4 output capacitance. Light-load performance depends on minimizing FBX divider current and Schottky diode leakage - both specified in the LT8331EMSE#PBF Applications Information section for optimal design.
Is the LT8331EMSE#PBF pin-compatible with other members of the LT833x family?
No, the LT8331EMSE#PBF is not pin-compatible with LT8330 or LT8332. While sharing functional similarities, the LT8331EMSE#PBF uses a unique 16-lead MSOP package with pins 2, 4, 13, and 15 removed for high-voltage spacing - a mechanical and routing distinction confirmed in the LT8331EMSE#PBF ordering table and package drawing. Substituting other LT833x variants requires PCB redesign due to differing pin counts and layouts.
Does the LT8331EMSE#PBF require external compensation components?
No, the LT8331EMSE#PBF features fully internal compensation - no external Type II or Type III compensation network is needed. Its current-mode architecture with built-in slope compensation and error amplifier is factory-tuned for stability across all supported topologies and input/output combinations. Designers only select output LC values and feedback resistors; the LT8331EMSE#PBF's internal loop ensures phase margin >45° without user intervention.
LT8331EMSE#PBF 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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-MSOP-EP
LT8331EMSE#PBF FAQ
1.How can I place an order for LT8331EMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8331EMSE#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 LT8331EMSE#PBF reliable?
The price and inventory of LT8331EMSE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8331EMSE#PBF is usually 5 days.
3.What payment methods are accepted for LT8331EMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8331EMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8331EMSE#PBF?
LT8331EMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8331EMSE#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 LT8331EMSE#PBF?
For technical support, including LT8331EMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8331EMSE#PBF requirements.
6.How does Aetrix verify that LT8331EMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LT8331EMSE#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 LT8331EMSE#PBF meets industry standards.
7.What is the process for return or replacement of LT8331EMSE#PBF?
All LT8331EMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8331EMSE#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 LT8331EMSE#PBF part is unused and in its original packaging.
Return procedure for LT8331EMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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