My Inquiry
My Account
Analog Devices Inc. LT8331EMSE#TRPBF
- Part No.:
- LT8331EMSE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width), 12 Leads, Exposed Pad
- Datasheet:
-
LT8331EMSE#TRPBF.pdf
- Description:
- IC REG BOOST FLYBACK ADJ 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,095
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LT8331EMSE#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 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 LT8331EMSE#TRPBF datasheet, LT8331EMSE#TRPBF pinout, LT8331EMSE#TRPBF application, or LT8331EMSE#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 LT8331EMSE#TRPBF implements fixed-frequency current-mode control with internal compensation, enabling stable operation across wide VIN (4.5V–100V) and VOUT ranges. Its dual-amplifier FBX architecture selects between +1.6V (positive output) or –0.8V (negative output) reference based on external resistor divider polarity, eliminating topology-specific pins.
Switching mode is selected via SYNC/MODE pin: ground enables Burst Mode (6µA IQ, low ripple), INTVCC enables pulse-skipping, and external clock enables synchronization up to 625kHz. Frequency foldback activates when FBX approaches 0V during start-up or fault, extending minimum off-time to prevent inductor current runaway.
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 and flyback designs with margin for transients and leakage spikes. |
| Quiescent Current | 6µA in Burst Mode - sustains >10-year battery life in always-on remote sensors and telematics. |
| Switching Frequency | 100kHz to 500kHz (programmable via RT resistor) - balances EMI, size, and efficiency for compact PCB layouts. |
| FBX Regulation | +1.60V or –0.80V - single-pin support for both positive and negative outputs eliminates external level-shifting circuitry. |
| BIAS Pin Function | Accepts 4.4V–(VIN–0.4V) supply - reduces VIN load by powering INTVCC regulator externally, improving full-load efficiency by ~2%. |
| Operating Junction Temp | –40°C to +125°C - qualified for under-hood automotive and industrial environments per AEC-Q100. |
Pinout & Package
LT8331EMSE#TRPBF uses a thermally enhanced 16-lead plastic MSOP package with four pins removed (pins 2, 4, 13, 15) to increase creepage/clearance for high-voltage isolation. Exposed pad (Pin 17) is PGND/GND and must be soldered to a continuous copper plane for thermal management (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 - allows precise system-level brownout protection. |
| VIN (3) | Main Input Supply | 4.5V–100V input path; requires local 10µF ceramic bypass near pin and exposed pad to minimize noise and voltage drop. |
| INTVCC (5) | Internal 3.2V Regulator Output | Supplies gate drivers and logic; must be bypassed with ≥1µF ceramic capacitor - no external loading permitted. |
| BIAS (7) | Secondary Supply for INTVCC | When 4.4V ≤ BIAS ≤ VIN–0.4V, powers INTVCC regulator - reduces VIN current draw and improves efficiency at all loads. |
| FBX (9) | Feedback Input | Single pin accepts either positive (1.6V ref) or negative (–0.8V ref) output divider - eliminates topology-specific feedback networks. |
| RT (10) | Frequency Programming | Resistor to GND sets fSW from 100kHz to 500kHz - enables EMI tuning and inductor size optimization. |
| SS (11) | Soft-Start Control | 2µA constant-current charge into external capacitor - controls inductor current ramp rate to prevent saturation and overshoot. |
| SYNC/MODE (12) | Mode Selection / Clock Sync | GND = Burst Mode; INTVCC = pulse-skipping; external clock = sync - provides flexible light-load behavior and system timing coordination. |
| SW1, SW2 (14, 16) | Power Switch Outputs | Drain/source terminals of internal 140V/0.5A MOSFET - require minimal trace area and direct connection to transformer/inductor to reduce EMI. |
| PGND/GND (17) | Power & Signal Ground | Exposed pad serves as primary thermal path and low-impedance return - must be fully soldered to inner/outer ground planes. |
Key Features
| Feature | Design Value |
|---|---|
| Single FBX Topology Flexibility | Supports boost, SEPIC, flyback, and inverting configurations with identical pinout and feedback network - reduces BOM and layout variants. |
| Burst Mode with 6µA IQ | Maintains regulation while drawing only 6µA from VIN at light loads - extends battery runtime without sacrificing output ripple (<20mV typical). |
| Programmable UVLO Threshold | Resistive divider on EN/UVLO pin sets custom turn-on/turn-off voltages (e.g., 36V–60V for 48V systems) - prevents erratic startup during battery sag. |
| Frequency Foldback Protection | Reduces fSW when FBX ≈ 0V during start-up or fault - ensures sufficient off-time to prevent inductor current runaway and switch overcurrent. |
| AEC-Q100 Qualified | Rated for automotive applications (Grade E, –40°C to +125°C) - includes production flow, stress testing, and failure analysis per automotive reliability standards. |
Applications
| Industrial Power Supplies | Automotive Telematics |
|---|---|
|
Use Scenario: 48V rail generation from 36–72V vehicle battery in ADAS camera modules and V2X units. IC Role / Device Role / Timing Role: Primary DC/DC controller implementing SEPIC topology to maintain regulated 48V output despite cold-crank transients. Use Value: 140V switch rating withstands 100V load-dump spikes; 6µA IQ enables always-on GPS tracking without draining starter battery. |
Use Scenario: Negative bias supply for CCD image sensors in rear-view cameras. IC Role / Device Role / Timing Role: Inverting converter generating –12V from 12V battery with single FBX feedback loop. Use Value: –0.8V FBX reference enables accurate negative output programming without op-amps or level shifters. |
| Telecom Remote Units | Medical Diagnostic Portables |
|
Use Scenario: Isolated 48V PoE midspan power conversion for outdoor wireless access points. IC Role / Device Role / Timing Role: Flyback controller driving transformer with synchronous rectification control via external MOSFETs. Use Value: Programmable 100–500kHz frequency avoids sensitive RF bands; BIAS pin improves efficiency when VOUT > VIN. |
Use Scenario: Battery-powered ultrasound probe requiring isolated ±15V analog rails and low-noise 3.3V digital supply. IC Role / Device Role / Timing Role: Dual-output converter using two LT8331EMSE#TRPBFs - one for +15V (boost), one for –15V (inverting). Use Value: Identical pinout and footprint simplifies dual-rail design; soft-start prevents probe sensor damage during power-up. |
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#TRPBF | 2-phase synchronous buck controller; 4–60V input; no integrated switch; requires external MOSFETs. | Higher efficiency at >2A loads; unsuitable for isolated or negative-output topologies. | Select LTC3891EMSE#TRPBF only for high-current non-isolated step-down where external FETs are acceptable. |
| MAX25203ATPA/VY+ | Automotive-grade 60V buck-boost controller; 3.5–60V input; 0.5A integrated switch; no flyback/SEPIC support. | Limited to buck-boost only; lacks dual-polarity FBX and BIAS pin functionality. | Choose MAX25203ATPA/VY+ only for simpler 12V/24V automotive buck-boost where topology flexibility is not required. |
Compared with LTC3891EMSE#TRPBF and MAX25203ATPA/VY+, the LT8331EMSE#TRPBF uniquely integrates 140V switching capability, single-pin topology selection, and dual-polarity feedback - making it the only option for compact, isolated, or bipolar-output designs within its voltage class.
Availability
LT8331EMSE#TRPBF is available at Aetrix Electronics and suitable for industrial power supplies, automotive telematics, telecom remote units, and medical diagnostic portables requiring stable component supply across extended temperature and voltage ranges.
Supply support for LT8331EMSE#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 industrial, automotive, communications, and healthcare markets since 1965.
The LT8331EMSE#TRPBF belongs to Analog Devices' Power by Linear™ family of high-voltage DC/DC controllers, designed specifically for rugged, wide-input industrial and automotive power conversion where reliability, integration, and topology flexibility are critical.
FAQ
What is the maximum input voltage supported by the LT8331EMSE#TRPBF?
The LT8331EMSE#TRPBF supports an absolute maximum input voltage of 100V on the VIN pin, with guaranteed operation from 4.5V to 100V. This range enables direct use in 48V industrial systems, 24V/48V automotive architectures, and telecom equipment without external pre-regulation. The 140V-rated internal switch provides headroom for transient suppression and leakage spikes.
How does the LT8331EMSE#TRPBF achieve 6µA quiescent current?
The LT8331EMSE#TRPBF 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 is disabled, and only essential bias currents remain active. This architecture maintains output regulation while minimizing average input current - critical for battery-powered applications like telematics and remote sensors.
Can the LT8331EMSE#TRPBF generate negative output voltages?
Yes, the LT8331EMSE#TRPBF can generate negative output voltages using its inverting topology configuration. When the FBX pin is pulled below GND via a resistor divider from the negative output, the internal –0.80V reference engages, enabling precise regulation of negative rails such as –12V or –15V without additional op-amps or level-shifters - confirmed in the Electrical Characteristics table and Block Diagram.
What package type is used for the LT8331EMSE#TRPBF?
The LT8331EMSE#TRPBF uses a 16-lead plastic MSOP package with four pins removed (pins 2, 4, 13, 15) to increase high-voltage creepage and clearance. The exposed pad (Pin 17) is electrically and thermally connected to PGND/GND and must be soldered to a PCB ground plane to achieve θJC = 10°C/W and ensure reliable operation at full load and temperature.
Does the LT8331EMSE#TRPBF support external clock synchronization?
Yes, the LT8331EMSE#TRPBF supports external clock synchronization via the SYNC/MODE pin. Applying a square wave (20–80% duty cycle, 0.6V–2.4V thresholds) synchronizes the internal oscillator to frequencies from 100kHz to 625kHz. This feature enables EMI reduction in dense PCB layouts and timing coordination across multiple converters in multi-rail systems.
LT8331EMSE#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
LT8331EMSE#TRPBF FAQ
1.How can I place an order for LT8331EMSE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8331EMSE#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 LT8331EMSE#TRPBF reliable?
The price and inventory of LT8331EMSE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8331EMSE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8331EMSE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8331EMSE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8331EMSE#TRPBF?
LT8331EMSE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8331EMSE#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 LT8331EMSE#TRPBF?
For technical support, including LT8331EMSE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8331EMSE#TRPBF requirements.
6.How does Aetrix verify that LT8331EMSE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8331EMSE#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 LT8331EMSE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8331EMSE#TRPBF?
All LT8331EMSE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8331EMSE#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 LT8331EMSE#TRPBF part is unused and in its original packaging.
Return procedure for LT8331EMSE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT8331EMSE#TRPBF Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
