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Analog Devices Inc. LT8331IMSE#PBF
- Part No.:
- LT8331IMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width), 12 Leads, Exposed Pad
- Datasheet:
-
LT8331IMSE#PBF.pdf
- Description:
- IC REG BOOST FLYBACK ADJ 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:331
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Product details
Overview
LT8331IMSE#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 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 telemetry systems.
For engineers reviewing the LT8331IMSE#PBF datasheet, LT8331IMSE#PBF pinout, LT8331IMSE#PBF application, or LT8331IMSE#PBF equivalent, key selection criteria include its 140V switch rating, programmable 100–500kHz switching frequency, BIAS pin for efficiency optimization, ±4V FBX regulation range, and AEC-Q100 qualification for automotive-grade reliability.
Technical Context
The LT8331IMSE#PBF implements fixed-frequency current-mode control with internal compensation, enabling stable operation across wide VIN (4.5V–100V) and VOUT ranges without external loop compensation. Its dual-amplifier FBX architecture supports both positive (1.60V reference) and negative (–0.80V reference) output regulation via topology-dependent amplifier selection.
Switching behavior is dynamically managed through SYNC/MODE pin configuration: ground enables Burst Mode (6µA IQ, low ripple), INTVCC enables pulse-skipping mode, and external clock input synchronizes operation up to 625kHz. Frequency foldback activates when FBX approaches 0V, extending minimum off-time to prevent inductor current runaway during start-up or fault conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 100V - supports direct connection to 48V telecom, 72V industrial, or battery-string inputs without pre-regulation. |
| Switch Rating | 140V, 0.5A - enables high-step-up ratios (e.g., 12V→48V) and flyback isolation with ≤1:4 turns ratio in 100V-class systems. |
| Quiescent Current | 6µA in Burst Mode - sustains >1-year battery life in always-on sensor nodes drawing <100µA average load current. |
| Switching Frequency | 100kHz to 500kHz (RT-programmable) - balances EMI filtering cost (lower fSW) vs. inductor size (higher fSW) for compact designs. |
| FBX Regulation | +1.60V or –0.80V reference - allows single-pin programming of either polarity output without external op-amps or level shifters. |
| BIAS Pin Function | Accepts 4.4V–(VIN–0.4V) supply - offloads INTVCC current from VIN, improving full-load efficiency by up to 3% in SEPIC/flyback with VOUT < VIN. |
| Operating Temp | –40°C to +125°C junction - qualified for under-hood automotive, industrial control cabinets, and outdoor telecom enclosures. |
Pinout & Package
The LT8331IMSE#PBF is housed in a thermally enhanced 16-lead MSOP package with pins 2, 4, 13, and 15 removed to ensure high-voltage creepage between SW1/SW2 and adjacent signals. The exposed pad (Pin 17) must be soldered to a continuous PCB ground plane for thermal dissipation (θJC = 10°C/W) and optimal EMI performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN/UVLO (1) | Enable / Undervoltage Lockout Input | Programmable turn-on threshold (1.576–1.90V rising) and hysteresis (140mV); draws <1µA when pulled below 0.2V for zero-power shutdown. |
| VIN (3) | Main Input Supply | Accepts 4.5V–100V; powers internal circuitry and switch when BIAS is inactive; requires local 10µF+ ceramic bypass near PGND. |
| INTVCC (5) | Internal 3.2V Regulator Output | Supplies gate drivers and logic; must be bypassed with ≥1µF ceramic to GND; cannot be externally loaded or driven. |
| BIAS (7) | Secondary Supply Input | Provides INTVCC current when 4.4V ≤ BIAS ≤ VIN–0.4V; reduces VIN supply current and improves efficiency in VOUT-fed configurations. |
| FBX (9) | Feedback Input | Single pin accepts resistor divider from VOUT; regulates to +1.60V (boost/SEPIC/flyback) or –0.80V (inverting) based on topology. |
| RT (10) | Frequency Programming | Resistor to GND sets fSW from 100kHz (324kΩ) to 500kHz (56.2kΩ); enables precise EMI band placement and inductor sizing. |
| SS (11) | Soft-Start Control | Capacitor to GND controls inductor current ramp rate; 2µA charge current prevents overshoot and limits peak switch stress during startup. |
| SYNC/MODE (12) | Mode Selection / Clock Sync | Ground = Burst Mode; INTVCC = pulse-skipping; external square wave = synchronization (100–625kHz, 20–80% duty). |
| SW1, SW2 (14, 16) | Power Switch Outputs | 140V, 0.5A NMOS drains; require minimal trace area and Kelvin routing to PGND to minimize switching losses and EMI. |
| PGND/GND (17) | Power & Signal Ground | Exposed pad; mandatory solder connection to large copper pour for thermal management and low-impedance return path. |
Key Features
| Feature | Design Value |
|---|---|
| Single FBX Topology Flexibility | One feedback pin supports boost, SEPIC, flyback, and inverting configurations-eliminates need for topology-specific ICs or external signal conditioning. |
| Burst Mode Efficiency | 6µA IQ with <20mV output ripple at light loads-enables multi-year operation in battery-powered IoT sensors without compromising noise-sensitive analog circuits. |
| Programmable UVLO | Resistive divider on EN/UVLO sets precise system-level input turn-on/off thresholds (e.g., 36V–72V telecom range) with built-in 140mV hysteresis. |
| Thermal Lockout Protection | Shuts down at 170°C junction temperature and auto-restarts after 5°C cooldown-prevents permanent damage in sealed enclosures or high-ambient environments. |
| Internally Compensated Loop | No external compensation components required-reduces BOM count and layout sensitivity while maintaining stability across 10:1 input/output voltage ratios. |
Applications
| Industrial Sensor Transmitters | Automotive Body Control Modules |
|---|---|
|
Use Scenario: 4–20mA loop-powered pressure/temperature transmitter operating from 12–36V supply in factory automation. IC Role / Device Role / Timing Role: Primary DC/DC controller generating isolated 5V/3.3V rails from variable input; manages burst-mode sleep cycles during sensor idle periods. Use Value: 6µA quiescent current extends loop compliance margin, allowing operation down to 8V input while maintaining 4mA minimum loop current. |
Use Scenario: Power supply for door module ECUs requiring 5V/3.3V rails from 9–16V battery with cold-crank tolerance to 4.5V. IC Role / Device Role / Timing Role: High-input-range buck-derived SEPIC regulator delivering regulated outputs during cranking transients and load-dump events. Use Value: 100V switch rating withstands ISO 7637-2 Pulse 5a (120V) without clamping diodes; AEC-Q100 qualification ensures automotive lifecycle reliability. |
| Telecom Remote Radio Units | Portable Medical Diagnostic Devices |
|
Use Scenario: 48V-powered remote radio head requiring +12V and –5V rails for RF amplifiers and ADC biasing in outdoor base stations. IC Role / Device Role / Timing Role: Dual-output flyback controller using single LT8331IMSE#PBF with coupled inductor; synchronized to system clock via SYNC pin. Use Value: Programmable 450kHz switching frequency avoids critical 4G/5G bands; BIAS pin fed from +12V rail improves full-load efficiency by 2.8%. |
Use Scenario: Battery-operated ultrasound probe requiring stable ±5V analog supplies and 3.3V digital rail from single Li-ion cell (2.7–4.2V). IC Role / Device Role / Timing Role: Inverting converter generating –5V from 3.3V LDO output; soft-start (SS pin) prevents transducer element overvoltage during power-up. Use Value: Single FBX pin simplifies feedback network for negative rail; 125°C max junction rating supports sterilization temperature margins. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar DC/DC controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8330IMSE#PBF | Lacks BIAS pin and SYNC/MODE functionality; fixed 200kHz frequency; 100V switch rating. | Suitable only for cost-sensitive, fixed-frequency boost/SEPIC where efficiency optimization and clock sync are unnecessary. | Select LT8330IMSE#PBF only if BIAS-driven efficiency gain and external synchronization are not required. |
| MAX5026ASA+ | Fixed 500kHz frequency; no programmable UVLO; 76V switch rating; no inverting capability; requires external compensation. | Targeted at simple 24V–48V boost converters in non-automotive industrial settings with less stringent EMI or thermal requirements. | Choose MAX5026ASA+ only for basic boost applications where topology flexibility, AEC-Q100, and ultralow IQ are not needed. |
Compared with LT8330IMSE#PBF and MAX5026ASA+, the LT8331IMSE#PBF provides unique value in multi-topology support, 140V switch robustness, and 6µA Burst Mode IQ-making it the sole option among the three qualified for automotive and long-life battery systems demanding both high voltage and ultra-low standby power.
Availability
LT8331IMSE#PBF is available at Aetrix Electronics and suitable for industrial sensor transmitters, automotive body control modules, and telecom remote radio units requiring stable component supply with guaranteed long-term availability and automotive-grade traceability.
Supply support for LT8331IMSE#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 digital signal processing semiconductors, serving precision instrumentation, industrial automation, and automotive safety markets since 1965.
The LT8331IMSE#PBF belongs to Analog Devices' Power by Linear™ portfolio of high-voltage DC/DC controllers, designed specifically for ruggedized power conversion in automotive, industrial, and telecom infrastructure where input voltage extremes and long operational life are critical.
FAQ
What is the maximum input voltage supported by the LT8331IMSE#PBF?
The LT8331IMSE#PBF supports an absolute maximum input voltage of 100V on the VIN pin, with continuous operation specified from 4.5V to 100V. This enables direct integration into 48V telecom systems, 72V industrial buses, and automotive 24V/48V architectures without external pre-regulation stages. The 100V rating also accommodates transient surges per ISO 7637-2 Pulse 5a (120V) when combined with appropriate input protection.
How does the LT8331IMSE#PBF achieve 6µA quiescent current?
The LT8331IMSE#PBF achieves 6µA quiescent current in Burst Mode operation by entering deep sleep cycles between short energy pulses delivered to the output capacitor. During sleep, most internal circuitry-including the oscillator and gate drivers-is disabled, leaving only essential bias currents active. This architecture maintains output regulation while minimizing input current draw, making the LT8331IMSE#PBF ideal for battery-powered applications requiring multi-year operational life.
Can the LT8331IMSE#PBF generate negative output voltages?
Yes, the LT8331IMSE#PBF can generate negative output voltages using inverting topology. Its FBX pin regulates to –0.80V when configured for inversion, enabling straightforward resistor-divider programming of negative rails (e.g., –5V, –12V) without additional op-amps or level-shifting circuitry. The same FBX pin and control architecture support both positive and negative outputs, reducing design complexity and BOM count.
What package type and thermal characteristics does the LT8331IMSE#PBF use?
The LT8331IMSE#PBF uses a 16-lead MSOP package with four pins (2, 4, 13, 15) removed to increase creepage distance for high-voltage isolation. Its exposed thermal pad (Pin 17) must be soldered to a PCB ground plane to achieve θJC = 10°C/W and θJA = 45°C/W. This construction enables reliable operation at 125°C junction temperature in enclosed industrial and automotive environments.
Is the LT8331IMSE#PBF AEC-Q100 qualified?
Yes, the LT8331IMSE#PBF is AEC-Q100 qualified for automotive applications. It is rated for operation from –40°C to +125°C junction temperature and has undergone stress testing including HTOL, TC, UHAST, and ESD per AEC-Q100 Rev H. This qualification makes the LT8331IMSE#PBF suitable for under-hood and cabin applications such as body control modules, ADAS power supplies, and infotainment subsystems.
LT8331IMSE#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
LT8331IMSE#PBF FAQ
1.How can I place an order for LT8331IMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8331IMSE#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 LT8331IMSE#PBF reliable?
The price and inventory of LT8331IMSE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8331IMSE#PBF is usually 5 days.
3.What payment methods are accepted for LT8331IMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8331IMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8331IMSE#PBF?
LT8331IMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8331IMSE#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 LT8331IMSE#PBF?
For technical support, including LT8331IMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8331IMSE#PBF requirements.
6.How does Aetrix verify that LT8331IMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LT8331IMSE#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 LT8331IMSE#PBF meets industry standards.
7.What is the process for return or replacement of LT8331IMSE#PBF?
All LT8331IMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8331IMSE#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 LT8331IMSE#PBF part is unused and in its original packaging.
Return procedure for LT8331IMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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