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Analog Devices Inc. LT3001IS5#TRPBF
- Part No.:
- LT3001IS5#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
LT3001IS5#TRPBF.pdf
- Description:
- IC REG FLYBACK 5V 1.2A TSOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,436
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Product details
Overview
LT3001IS5#TRPBF from Analog Devices is a micropower isolated flyback converter IC with integrated 1.2A/65V DMOS switch, operating from 4V to 36V input and delivering up to 4W isolated output power. It regulates output voltage via primary-side sampling-eliminating opto-isolators and third-winding requirements-and sets VOUT using a single external resistor (RFB). Used in telecom auxiliary supplies and industrial isolated housekeeping rails.
For engineers reviewing the LT3001IS5#TRPBF datasheet, LT3001IS5#TRPBF pinout, LT3001IS5#TRPBF application, or LT3001IS5#TRPBF equivalent, key selection criteria include boundary/low-ripple burst mode operation, EN/UVLO programmability, RFB-based output setting, internal compensation, and TSOT-23 package thermal performance at 215°C/W θJA.
Technical Context
The LT3001IS5#TRPBF implements current-mode control in boundary conduction mode (BCM) at heavy loads and low-ripple Burst Mode® at light loads, enabling high efficiency across 6mA–1.15A output range. Its feedback architecture samples reflected output voltage directly from the SW pin during zero secondary current, eliminating isolation barriers for regulation.
It integrates a 65V DMOS switch, internal soft-start, overtemperature protection, and output short-circuit protection. The EN/UVLO pin provides accurate 1.228V enable threshold with 14mV hysteresis and supports user-programmable UVLO via resistive divider with 2.5µA hysteresis current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 36V - supports wide-input industrial and automotive supply rails without external pre-regulation. |
| Output Power | Up to 4W - sufficient for isolated auxiliary/housekeeping rails in telecom and medical systems. |
| Switch Rating | 1.2A, 65V DMOS - handles flyback voltage spikes up to 65V with built-in derating guidance for leakage inductance. |
| Quiescent Current | 0.8µA (typ) in shutdown - enables ultra-low standby power in always-on isolated subsystems. |
| Regulation Method | Primary-side sampling via RFB - eliminates opto-isolator, third winding, and associated aging/nonlinearity issues. |
| Switching Frequency | 9.4–10.6kHz min - ensures stable boundary-mode operation and predictable transformer design constraints. |
| RFB Regulation Current | 100µA (typ) - sets output as VOUT = 100µA × RFB × NPS − VF, enabling precise, resistor-based programming. |
Pinout & Package
LT3001IS5#TRPBF is housed in a 5-lead plastic TSOT-23 package (S5), with θJA = 215°C/W. The compact 2.9mm × 1.6mm footprint supports high-density isolated DC/DC designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN/UVLO (Pin 1) | Enable / Undervoltage Lockout Input | Enables IC when >1.228V; supports programmable UVLO with 2.5µA hysteresis current for stable turn-on/turn-off thresholds. |
| GND (Pin 2) | Ground Reference | Local ground return for internal circuitry and feedback reference; must connect directly to low-impedance ground plane. |
| RFB (Pin 3) | Feedback Resistor Input | Connects external RFB to SW pin; senses reflected output voltage to set VOUT without secondary-side components. |
| SW (Pin 4) | Switch Drain Node | Drain of integrated 65V DMOS; carries high dv/dt flyback pulses-requires minimized trace area to reduce EMI and voltage overshoot. |
| VIN (Pin 5) | Main Input Supply | Powers internal circuitry and serves as reference for RFB feedback loop; requires local ceramic bypass capacitor to GND. |
Key Features
| Feature | Design Value |
|---|---|
| No opto-isolator or third winding required | Reduces BOM count, cost, and long-term drift risk by sampling output voltage directly from primary-side flyback waveform. |
| Boundary + low-ripple Burst Mode® operation | Maintains >75% efficiency from 6mA to full load while limiting output ripple to <50mV (at 5V) under light-load conditions. |
| Single-resistor output programming | VOUT set via RFB with 100µA regulation current-enables rapid prototyping and field-adjustable outputs without secondary feedback loops. |
| Integrated soft-start and compensation | Eliminates external compensation network and startup inrush control components, reducing layout complexity and validation time. |
| Accurate EN/UVLO with hysteresis | 1.228V ±14mV enable threshold plus 2.5µA hysteresis current allows robust, noise-immune input rail sequencing and brownout recovery. |
Applications
| Isolated Telecom Auxiliary Supply | Industrial Housekeeping Power |
|---|---|
Use Scenario: Providing isolated 5V bias for control logic, ADC references, and communication interfaces in 48V telecom line cards. IC Role / Device Role / Timing Role: Primary-side isolated flyback controller regulating output without secondary feedback components. Use Value: Enables compact, reliable 4W auxiliary rail with no opto-isolator aging or transformer third-winding losses. |
Use Scenario: Generating isolated 5V/0.5A for PLC I/O modules, sensor signal conditioning, and isolated gate drivers in factory automation. IC Role / Device Role / Timing Role: Micropower flyback controller delivering stable output across 4V–36V input transients common in 24V industrial rails. Use Value: Achieves <0.5% minimum load requirement and 85% peak efficiency-reducing heat buildup in sealed enclosures. |
| Automotive Body Control Module (BCM) | Medical Isolated Monitoring Rail |
Use Scenario: Supplying isolated 5V for CAN transceiver bias and microcontroller peripherals in 12V vehicle body electronics. IC Role / Device Role / Timing Role: Boundary-mode flyback controller with EN/UVLO programmability for cold-crank (4V) and load-dump (36V) resilience. Use Value: Maintains regulation during battery voltage dips/spikes without external LDO pre-regulation or complex UVLO circuits. |
Use Scenario: Delivering patient-isolated 5V power for analog front-end amplifiers and data acquisition in portable ECG monitors. IC Role / Device Role / Timing Role: Safety-certifiable isolated power source meeting creepage/clearance requirements via transformer-only isolation. Use Value: Eliminates opto-isolator CTR degradation-ensuring long-term accuracy and regulatory compliance in Class II medical devices. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar isolated flyback controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| UCC28711DR | Requires external opto-isolator and TL431; no primary-side sensing; 700V MOSFET; higher IQ (1.5mA active) | Used where legacy opto-based designs exist; less suited for space-constrained or long-life applications due to opto aging | Choose UCC28711DR only if reusing existing opto-coupled transformer designs or requiring higher input voltage rating (>36V) |
| MAX17690ATP+ | Integrated 100V MOSFET; supports synchronous rectification; requires external RFB and compensation; no Burst Mode | Preferred for higher-efficiency (>90%) designs with secondary-side control; not suitable for ultra-low-IQ standby | Choose MAX17690ATP+ when designing for >10W output or needing synchronous rectifier drive capability-not for <4W micropower use cases |
Compared with UCC28711DR and MAX17690ATP+, the LT3001IS5#TRPBF uniquely delivers isolated regulation without opto-isolators or third windings, achieves sub-1µA shutdown IQ, and supports boundary + low-ripple burst modes-making it optimal for compact, maintenance-free 4W isolated rails where long-term stability and minimal BOM are critical.
Availability
LT3001IS5#TRPBF is available at Aetrix Electronics and suitable for isolated telecom auxiliary supplies, industrial housekeeping power, and automotive BCM applications requiring stable component supply, long-lifecycle support, and guaranteed -40°C to +125°C operation.
Supply support for LT3001IS5#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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LT3001IS5#TRPBF belongs to Analog Devices' µPower isolated DC/DC controller product line, designed specifically to replace opto-coupled flyback solutions with primary-side sensing for enhanced reliability, reduced size, and simplified certification in safety-isolated systems.
FAQ
What is the maximum output power supported by the LT3001IS5#TRPBF?
The LT3001IS5#TRPBF delivers up to 4W of isolated output power across its 4V–36V input range. At VIN = 36V, it supports up to 1.15A output current for a 5V rail. Performance depends on transformer selection, layout, and thermal management-designs exceeding 4W require external switching stages or parallel controllers.
How does the LT3001IS5#TRPBF regulate output voltage without an opto-isolator?
The LT3001IS5#TRPBF samples the reflected output voltage directly from the flyback pulse on the SW pin during zero secondary current-enabling precise regulation without opto-isolators or third transformer windings. This method relies on boundary/discontinuous conduction mode timing and internal 100µA RFB current for VOUT = 100µA × RFB × NPS − VF.
What is the minimum load requirement for stable operation of the LT3001IS5#TRPBF?
The LT3001IS5#TRPBF requires less than 0.5% of full output power as minimum load-approximately 6mA for a 5V/1A design. This arises from minimum switch-off time (450ns) and frequency constraints. If pre-loading is unacceptable, a Zener diode (e.g., 6V for 5V output) can serve as a passive minimum load.
Can the LT3001IS5#TRPBF be used with input voltages below 4V?
No-the LT3001IS5#TRPBF has a specified input voltage range of 4V to 36V. Operation below 4V violates absolute maximum ratings and causes failure to start or erratic regulation. For sub-4V inputs, consider pre-regulating with a boost converter or selecting a different controller such as the LT3003 (2.7V–20V range).
What package type and thermal characteristics apply to the LT3001IS5#TRPBF?
The LT3001IS5#TRPBF uses a 5-lead plastic TSOT-23 (S5) package with θJA = 215°C/W. Its compact 2.9mm × 1.6mm footprint supports high-density layouts, but thermal performance requires careful PCB copper area allocation-especially under continuous 4W load-to maintain junction temperature within –40°C to +125°C limits.
LT3001IS5#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
- Topology:
- Flyback
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4V
- Voltage - Input (Max):
- 36V
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- -
- Current - Output:
- 1.2A
- Frequency - Switching:
- 10kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-5
LT3001IS5#TRPBF FAQ
1.How can I place an order for LT3001IS5#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3001IS5#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 LT3001IS5#TRPBF reliable?
The price and inventory of LT3001IS5#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3001IS5#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3001IS5#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3001IS5#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3001IS5#TRPBF?
LT3001IS5#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3001IS5#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 LT3001IS5#TRPBF?
For technical support, including LT3001IS5#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3001IS5#TRPBF requirements.
6.How does Aetrix verify that LT3001IS5#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3001IS5#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 LT3001IS5#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3001IS5#TRPBF?
All LT3001IS5#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3001IS5#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 LT3001IS5#TRPBF part is unused and in its original packaging.
Return procedure for LT3001IS5#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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