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Analog Devices Inc. LT8331IMSE#TRPBF
- Part No.:
- LT8331IMSE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width), 12 Leads, Exposed Pad
- Datasheet:
-
LT8331IMSE#TRPBF.pdf
- Description:
- IC REG BOOST FLYBACK ADJ 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:421
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Product details
Overview
LT8331IMSE#TRPBF 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 LT8331IMSE#TRPBF datasheet, LT8331IMSE#TRPBF pinout, LT8331IMSE#TRPBF application, or LT8331IMSE#TRPBF equivalent, key selection criteria include its 140V switch rating, 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#TRPBF employs 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 FBX reference (±0.8V for inverting, +1.6V for positive outputs) enables topology reconfiguration without hardware change.
Switching behavior is dynamically managed via the SYNC/MODE pin: ground selects Burst Mode (6µA IQ, low ripple), INTVCC enables pulse-skipping mode, and external clock input synchronizes switching up to 625kHz. Frequency foldback activates when FBX approaches 0V 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 wide-range industrial and automotive battery inputs including 24V, 48V, and 72V nominal systems. |
| Integrated Switch Rating | 140V, 0.5A - enables high-step-up ratios and flyback/SEPIC isolation without external MOSFETs in sub-50W applications. |
| Quiescent Current (Burst Mode) | 6µA - sustains regulation at microamp-level loads while maintaining <20mV output ripple, critical for always-on subsystems. |
| Switching Frequency Range | 100kHz to 500kHz - programmable via RT resistor; allows EMI optimization and inductor size trade-offs. |
| FBX Regulation Voltage | +1.60V (positive VOUT) or –0.80V (negative VOUT) - single-pin topology selection eliminates need for external logic or configuration jumpers. |
| BIAS Pin Function | Accepts 4.4V–(VIN–0.4V) supply - offloads INTVCC regulator current from VIN, improving full-load efficiency by reducing input-side losses. |
| Operating Junction Temp | –40°C to +125°C - qualified for automotive AEC-Q100 Grade I and industrial environments with thermal lockout at 170°C. |
Pinout & Package
The LT8331IMSE#TRPBF is housed in a thermally enhanced 16-lead plastic MSOP package with four pins removed (MSE16 variation) to ensure high-voltage creepage between SW1/SW2 and GND. The exposed pad (Pin 17) is PGND/GND and must be soldered to a continuous PCB copper plane for thermal management (θJC = 10°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN/UVLO (Pin 1) | Enable / Undervoltage Lockout Input | 1.6V falling threshold disables switching; 1.74V rising threshold resumes operation - enables precise system-level brownout protection. |
| VIN (Pin 3) | Main Input Supply | 4.5V–100V rated input; requires local ceramic bypassing adjacent to exposed PGND pad to minimize high-di/dt loop area. |
| INTVCC (Pin 5) | Internal 3.2V Regulator Output | Must be bypassed with ≥1µF low-ESR ceramic capacitor; not externally loaded - powers gate drivers and internal logic. |
| BIAS (Pin 7) | Secondary Supply for INTVCC | When 4.4V ≤ BIAS ≤ VIN–0.4V, powers INTVCC instead of VIN - reduces input current and improves efficiency in SEPIC/flyback with VOUT < VIN. |
| FBX (Pin 9) | Feedback Reference Input | Regulates to +1.60V (boost/SEPIC/flyback) or –0.80V (inverting); determines topology and output polarity without external components. |
| RT (Pin 10) | Frequency Programming Input | Resistor to GND sets fSW from 100kHz–500kHz; RT = 32.85/fSW(MHz) – 9.5 kΩ - enables EMI spread-spectrum tuning. |
| SS (Pin 11) | Soft-Start Control | 2µA constant-current charge into external capacitor - controls inductor current ramp rate to prevent saturation and overshoot. |
| SYNC/MODE (Pin 12) | Mode Selection / Clock Sync | GND = Burst Mode; INTVCC = pulse-skipping; external square wave = synchronization - configures light-load behavior and timing alignment. |
| SW1, SW2 (Pins 14, 16) | Power Switch Outputs | 140V, 0.5A rated drain-source terminals; minimal trace area required to reduce radiated EMI from high dv/dt edges. |
| PGND/GND (Pin 17) | Power & Signal Ground | Exposed thermal pad; must be soldered to large copper pour - primary heat path and low-impedance return for switch currents. |
Key Features
| Feature | Design Value |
|---|---|
| Single-Pin Topology Selection | FBX pin auto-configures for +48V SEPIC, –12V inverting, or isolated flyback - eliminates board space and BOM cost of mode-setting resistors or jumpers. |
| Ultralow-IQ Burst Mode | 6µA shutdown current with regulated output - extends battery life in remote sensors and telematics modules requiring decades of standby operation. |
| Programmable UVLO Threshold | Resistive divider on EN/UVLO sets precise turn-on/off voltages (e.g., 36V–72V telecom range) - avoids uncontrolled brownout resets in vehicle power systems. |
| Thermal Lockout Protection | Shuts down at 170°C junction temperature and soft-restarts after 5°C cooldown - prevents permanent damage during overload or poor heatsinking. |
| Frequency Foldback | Reduces fSW when FBX ≈ 0V during start-up or fault - ensures minimum off-time is met and prevents inductor current runaway in low-VOUT conditions. |
Applications
| Automotive ADAS Power Supply | Industrial 48V Telecom Converter |
|---|---|
|
Use Scenario: Powering radar sensor modules from 12V/24V vehicle battery with strict EMI and standby current limits. IC Role / Device Role / Timing Role: Primary DC/DC controller generating isolated ±15V analog rails and 3.3V digital supply using flyback topology. Use Value: 6µA Burst Mode IQ enables always-on radar detection without draining battery; 140V switch withstands load-dump transients up to 120V. |
Use Scenario: Converting 48V backplane to 12V intermediate bus in telecom base station power architecture. IC Role / Device Role / Timing Role: High-efficiency SEPIC controller delivering regulated 12V output with input voltage sag down to 36V. Use Value: BIAS pin connected to 12V output reduces VIN current draw by >30% at full load; programmable fSW avoids sensitive 400kHz–600kHz EMI bands. |
| Portable Medical Imaging | Smart Grid Sensor Node |
|
Use Scenario: Generating ±5V bias for ultrasound transducer front-end in handheld diagnostic equipment. IC Role / Device Role / Timing Role: Inverting converter producing negative rail from single-cell Li-ion (3.0–4.2V) input. Use Value: Single FBX pin simplifies layout for dual-rail generation; 100kHz minimum fSW allows use of small, low-profile inductors for compact form factor. |
Use Scenario: Powering RF mesh nodes in utility metering infrastructure with 24V DC input and 10-year battery backup requirement. IC Role / Device Role / Timing Role: Boost converter stepping 24V to 48V for long-range LoRaWAN transmission. Use Value: 140V switch rating accommodates 24V input surges up to 100V; frequency synchronization prevents interference with narrowband RF receivers. |
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 | Lower 60V switch rating; fixed 2MHz fSW; no BIAS pin; requires external compensation. | Better suited for compact 5V–12V step-down applications; lacks high-voltage capability for 48V+ inputs. | Select when board space is constrained and input stays below 40V; avoid for automotive load-dump or telecom surge immunity. |
| MAX17504ATP+T | 100V switch; 0.3A current limit; no inverting topology support; requires external compensation network. | Optimized for high-efficiency buck conversion only; cannot replace LT8331IMSE#TRPBF in SEPIC/flyback/inverting designs. | Choose for cost-sensitive 12V–48V buck regulators where topology flexibility is unnecessary and 0.5A peak current is sufficient. |
Compared with LTC3639EMSE#PBF and MAX17504ATP+T, the LT8331IMSE#TRPBF uniquely combines 140V/0.5A integration, single-pin topology selection, and ultralow 6µA Burst Mode IQ - making it the only option for compact, high-voltage, multi-topology converters requiring decades of battery-backed operation.
Availability
LT8331IMSE#TRPBF is available at Aetrix Electronics and suitable for automotive ADAS power supplies, industrial 48V telecom converters, portable medical imaging systems, and smart grid sensor nodes requiring stable component supply across extended temperature and lifecycle requirements.
Supply support for LT8331IMSE#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 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#TRPBF belongs to Analog Devices' Power by Linear™ family of monolithic DC/DC controllers designed specifically for high-voltage, low-quiescent-current applications in harsh environments including automotive, industrial, and telecom infrastructure.
FAQ
What is the maximum input voltage supported by the LT8331IMSE#TRPBF?
The LT8331IMSE#TRPBF supports an absolute maximum input voltage of 100V on the VIN pin, with continuous operation specified from 4.5V to 100V. This enables direct connection to 48V and 72V industrial buses and tolerance of automotive load-dump transients up to 120V per ISO 7637-2, provided external clamping is used beyond absolute max ratings. The LT8331IMSE#TRPBF maintains regulation and protection features across this full range.
How does the LT8331IMSE#TRPBF achieve 6µA quiescent current?
The LT8331IMSE#TRPBF achieves 6µA quiescent current in Burst Mode by entering deep sleep between output pulses - disabling gate drivers, oscillator, and most internal circuitry while retaining regulation via periodic sampling of the FBX pin. This architecture minimizes input current while keeping output ripple below 20mV. The LT8331IMSE#TRPBF enters this state automatically when the SYNC/MODE pin is grounded and load current drops below ~1mA.
Can the LT8331IMSE#TRPBF generate negative output voltages?
Yes, the LT8331IMSE#TRPBF can generate negative output voltages using inverting topology. When the FBX pin is pulled to –0.80V via a resistor divider from VOUT to GND, the internal error amplifier A2 activates to regulate the negative rail. This is confirmed in the Electrical Characteristics table (FBX regulation voltage = –0.80V) and Block Diagram. The LT8331IMSE#TRPBF requires no additional components or pin changes to switch between positive and negative output configurations.
What is the purpose of the BIAS pin on the LT8331IMSE#TRPBF?
The BIAS pin on the LT8331IMSE#TRPBF supplies the INTVCC regulator when a secondary voltage source (4.4V ≤ BIAS ≤ VIN–0.4V) is present - diverting up to 1.4mA of regulator current away from the VIN pin. This reduces input-side conduction losses and improves full-load efficiency by 2–5% in SEPIC and flyback topologies where VOUT is lower than VIN. The LT8331IMSE#TRPBF automatically switches between BIAS and VIN sources based on voltage thresholds.
Is the LT8331IMSE#TRPBF pin-compatible with other LT8331 variants?
Yes, the LT8331IMSE#TRPBF shares identical pinout, package dimensions, and thermal pad layout with all LT8331 MSOP-16EP variants (e.g., LT8331EMSE#TRPBF, LT8331IMSE#WPBF). Differences are limited to temperature grade (I-grade = –40°C to +125°C), automotive qualification (W-suffix), and packaging (TRPBF = tape-and-reel). No PCB redesign is needed when substituting within the same package variant.
LT8331IMSE#TRPBF 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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-MSOP-EP
LT8331IMSE#TRPBF FAQ
1.How can I place an order for LT8331IMSE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8331IMSE#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 LT8331IMSE#TRPBF reliable?
The price and inventory of LT8331IMSE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8331IMSE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8331IMSE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8331IMSE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8331IMSE#TRPBF?
LT8331IMSE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8331IMSE#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 LT8331IMSE#TRPBF?
For technical support, including LT8331IMSE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8331IMSE#TRPBF requirements.
6.How does Aetrix verify that LT8331IMSE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8331IMSE#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 LT8331IMSE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8331IMSE#TRPBF?
All LT8331IMSE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8331IMSE#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 LT8331IMSE#TRPBF part is unused and in its original packaging.
Return procedure for LT8331IMSE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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