My Inquiry
My Account
Analog Devices Inc. LT8303ES5#TRPBF
- Part No.:
- LT8303ES5#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
LT8303ES5#TRPBF.pdf
- Description:
- IC REG FLYBCK ADJ 450MA TSOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,390
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LT8303ES5#TRPBF from Analog Devices (formerly Linear Technology) is a micropower, high-voltage isolated flyback controller IC with integrated 150V/450mA DMOS power switch, operating from 5.5V to 100V input and delivering up to 5W isolated output power. It regulates output voltage via primary-side flyback pulse sampling-eliminating opto-isolators and third windings-and uses a single external resistor (RFB) for output programming. Designed for auxiliary/housekeeping supplies in industrial and telecom systems, it supports boundary mode at heavy load and low-ripple Burst Mode® at light load.
For engineers reviewing the LT8303ES5#TRPBF datasheet, LT8303ES5#TRPBF pinout, LT8303ES5#TRPBF application, or LT8303ES5#TRPBF equivalent, key selection criteria include its 5.5–100V input range, 150V SW pin rating, 70µA sleep-mode quiescent current, boundary/discontinuous conduction mode operation, and TSOT-23-5 package compatibility with space-constrained isolated DC/DC designs.
Technical Context
The LT8303ES5#TRPBF implements current-mode control with a novel flyback pulse sense circuit and sample-and-hold error amplifier that samples the reflected output voltage at zero secondary current-enabling precise regulation without secondary-side feedback components. Its boundary mode detector and dual-frequency clamping logic (320–380 kHz max, 5–9 kHz min) dynamically shift between boundary conduction mode (heavy load), discontinuous conduction mode (medium load), and low-ripple Burst Mode® (light load).
Internal features include 1.223V EN/UVLO threshold with 16mV hysteresis, 12.23kΩ internal reference, 100µA RFB regulation current, and integrated soft-start and loop compensation. The 150V DMOS switch has 3.2Ω typical RDS(ON) and 450mA current limit, with minimum on/off times of 160ns and 350ns respectively-critical for stable sampling and EMI control.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 5.5V to 100V - supports wide-input industrial, telecom, and automotive auxiliary rails without pre-regulation. |
| Output Power Capability | Up to 5W - enables compact isolated supplies for microcontrollers, sensors, and gate drivers in high-voltage systems. |
| Integrated Switch | 150V/450mA DMOS - eliminates external high-voltage switch; rated for transient spikes ≤150V on SW pin. |
| Quiescent Current | 70µA in Sleep Mode - extends battery life in always-on isolated monitoring circuits. |
| Regulation Method | Primary-side flyback pulse sampling - removes opto-isolator and third winding, reducing BOM count and cost. |
| Switching Modes | Boundary mode (heavy load), Discontinuous mode (mid-load), Low-ripple Burst Mode® (light load) - balances efficiency, ripple, and stability across full load range. |
| Package | 5-Lead TSOT-23 - surface-mount, thermally enhanced package suitable for high-density PCB layouts. |
Pinout & Package
LT8303ES5#TRPBF is housed in a 5-lead ThinSOT™ (TSOT-23) plastic package with exposed pad for thermal performance. Pin functions are validated per Linear Technology's official pin configuration diagram and electrical characteristics table.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN/UVLO (Pin 1) | Enable / Input Undervoltage Lockout Input | Accurate 1.223V threshold with 16mV hysteresis; used to enable device or program VIN UVLO via resistor divider. |
| GND (Pin 2) | Power Ground Reference | Direct connection to local ground plane; serves as return path for internal regulators and feedback circuitry. |
| RFB (Pin 3) | Feedback Resistor Connection | Connects external resistor to SW pin; sets output voltage via 100µA regulation current and internal 12.23kΩ reference. |
| SW (Pin 4) | Drain of Integrated 150V DMOS Switch | High-voltage switching node; must be routed with minimal trace area to suppress EMI and leakage-induced voltage spikes. |
| VIN (Pin 5) | Main Input Supply | Supplies internal circuitry and acts as reference for RFB feedback; requires local ceramic bypass capacitor to GND. |
Key Features
| Feature | Design Value |
|---|---|
| No opto-isolator or third winding required | Reduces component count, cost, and board area while eliminating opto aging, nonlinearity, and slow response issues. |
| Single-resistor output programming | Enables rapid design iteration: VOUT = (100µA × RFB/NPS) − VF; no trimming or calibration needed for ±5% typical accuracy. |
| Low-ripple Burst Mode® operation | Maintains <10mVPP output ripple at light loads while achieving >80% efficiency down to 0.5% of full load. |
| Internal compensation & soft-start | Eliminates external compensation network and startup inrush control components-reducing design time and layout sensitivity. |
| Boundary mode with zero-current switching | Ensures consistent load regulation across line/load variations without external load-compensation circuitry. |
Applications
| Industrial PLC I/O Isolation | Telecom Line Card Auxiliary Supply |
|---|---|
|
Use Scenario: Providing isolated 5V/0.65A housekeeping power to analog front-end ADCs and digital isolators in programmable logic controller modules operating from 24–72V DC rails. IC Role / Device Role / Timing Role: Primary-side flyback controller regulating isolated output via reflected flyback pulse; handles all switching, sensing, and mode transitions autonomously. Use Value: Enables compact, reliable 5W isolated supply with no opto drift or transformer third-winding complexity-meeting IEC 61000-4 immunity requirements. |
Use Scenario: Generating isolated 3.3V/0.9A bias for SERDES transceivers and management MCU on telecom line cards powered from –48V DC distribution. IC Role / Device Role / Timing Role: High-voltage flyback controller with 150V SW rating tolerating –48V input transients and enabling direct connection to telecom power bus. Use Value: Delivers tight regulation and low ripple under dynamic load steps while maintaining 70µA quiescent current during standby-extending system uptime. |
| Automotive Body Control Module | Medical Sensor Isolation Barrier |
|
Use Scenario: Supplying isolated 12V/0.25A power to CAN transceiver and isolated gate driver in 12V/24V automotive body control units with cold-crank tolerance. IC Role / Device Role / Timing Role: Flyback controller supporting 5.5–100V input range-including 4.5V cold-crank dips and 16V load-dump surges-via robust EN/UVLO hysteresis. Use Value: Eliminates need for external surge protection and pre-regulators; achieves >85% peak efficiency across automotive temperature range (–40°C to 125°C). |
Use Scenario: Delivering isolated 5V/0.5A power to patient-connected biosensor front-ends requiring reinforced isolation per IEC 60601-1. IC Role / Device Role / Timing Role: Safety-critical isolated power controller using transformer-based galvanic isolation-no opto-isolator failure modes affecting patient safety. Use Value: Supports certified isolation barrier designs with predictable CMTI (>50 kV/µs) and no opto aging-ensuring long-term reliability in critical care environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar isolated flyback controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3748EMSE#TRPBF | Requires external MOSFET; supports up to 400V input; no integrated switch; uses opto-coupled or auxiliary winding feedback. | Better suited for >10W outputs or ultra-high input voltages where internal switch limitations apply. | Select when higher power or >150V input capability is required; adds complexity but improves thermal scalability. |
| UCC28740DR | TI part with integrated 700V MOSFET; uses primary-side sensing with different sampling algorithm; 700V rating vs. LT8303ES5#TRPBF's 150V. | Targeted at universal AC input (85–265VAC) offline adapters-not optimized for high-VDC industrial inputs. | Prefer for AC/DC adapter designs; avoid for 24–100V DC-fed systems due to over-spec'd voltage rating and lower light-load efficiency. |
Compared with LT3748EMSE#TRPBF and UCC28740DR, the LT8303ES5#TRPBF offers superior integration density and lowest quiescent current for sub-5W isolated DC/DC in high-VDC systems, but lacks the voltage headroom of alternatives-making it ideal for space-constrained, efficiency-critical auxiliary supplies where input stays ≤100V.
Availability
LT8303ES5#TRPBF is available at Aetrix Electronics and suitable for industrial PLCs, telecom line cards, automotive body control modules, and medical sensor isolation barriers requiring stable component supply and long-term manufacturability.
Supply support for LT8303ES5#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 acquired Linear Technology in 2017 and maintains full product support, documentation, and manufacturing continuity for the LT® series. Linear pioneered high-performance power management ICs with emphasis on precision, integration, and ruggedness.
The LT8303ES5#TRPBF belongs to Linear's isolated flyback controller product line, designed specifically to simplify and miniaturize isolated DC/DC conversion in high-reliability industrial, telecom, and automotive applications-replacing opto-based solutions with primary-side sensing architecture.
FAQ
What is the maximum input voltage the LT8303ES5#TRPBF can handle?
The LT8303ES5#TRPBF has an absolute maximum input voltage rating of 100V, with guaranteed operation from 5.5V to 100V. Transient spikes on the VIN pin must not exceed this limit. The SW pin is rated to 150V, but reflected flyback voltage (VIN + VOUT × NPS + leakage spike) must remain below 150V to prevent breakdown-requiring careful turns ratio selection per application.
Does the LT8303ES5#TRPBF require an opto-isolator or third transformer winding?
No. The LT8303ES5#TRPBF uses primary-side flyback pulse sampling to regulate the isolated output voltage-eliminating the need for an opto-isolator or third winding. This reduces component count, cost, and long-term reliability risks associated with opto aging and nonlinear response.
How is the output voltage set on the LT8303ES5#TRPBF?
The LT8303ES5#TRPBF sets output voltage using a single external resistor (RFB) connected between the RFB pin and the SW pin. With a nominal 100µA regulation current and internal 12.23kΩ reference, VOUT ≈ (100µA × RFB / NPS) − VF. A two-step tuning process-initial calculation followed by empirical adjustment-is recommended for ±5% accuracy.
What switching modes does the LT8303ES5#TRPBF support?
The LT8303ES5#TRPBF operates in three distinct modes: boundary conduction mode at heavy loads (for optimal efficiency and regulation), discontinuous conduction mode at medium loads (with frequency clamped to ≤380kHz), and low-ripple Burst Mode® at light loads (with 7kHz minimum frequency and 70µA sleep current) to maintain high efficiency and low output ripple.
Is the LT8303ES5#TRPBF RoHS-compliant and lead-free?
Yes. The LT8303ES5#TRPBF carries the #TRPBF suffix, indicating lead-free finish and compliance with RoHS Directive 2011/65/EU. Per Analog Devices' packaging documentation, it uses matte tin plating and meets JEDEC J-STD-020 moisture sensitivity level 1 (MSL1) for standard SMT assembly.
LT8303ES5#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- SOT-23-5 Thin, TSOT-23-5
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Up/Step-Down
- Output Configuration:
- Positive, Isolation Capable
- Topology:
- Flyback
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 5.5V
- Voltage - Input (Max):
- 100V
- Voltage - Output (Min/Fixed):
- -
- Voltage - Output (Max):
- -
- Current - Output:
- 450mA
- Frequency - Switching:
- 7kHz ~ 350kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-5
LT8303ES5#TRPBF FAQ
1.How can I place an order for LT8303ES5#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8303ES5#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 LT8303ES5#TRPBF reliable?
The price and inventory of LT8303ES5#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8303ES5#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8303ES5#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8303ES5#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8303ES5#TRPBF?
LT8303ES5#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8303ES5#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 LT8303ES5#TRPBF?
For technical support, including LT8303ES5#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8303ES5#TRPBF requirements.
6.How does Aetrix verify that LT8303ES5#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8303ES5#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 LT8303ES5#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8303ES5#TRPBF?
All LT8303ES5#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8303ES5#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 LT8303ES5#TRPBF part is unused and in its original packaging.
Return procedure for LT8303ES5#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT8303ES5#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…
