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Analog Devices Inc. LT3461AES6#TRPBF
- Part No.:
- LT3461AES6#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LT3461AES6#TRPBF.pdf
- Description:
- IC REG BOOST ADJ 300MA TSOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:1,928
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Product details
Overview
LT3461AES6#TRPBF from Analog Devices (formerly Linear Technology) is a 3MHz fixed-frequency current-mode step-up DC/DC converter with integrated Schottky diode and 40V switch, delivering up to 38V output from 2.5V–16V input. It features 260mV VCE(SAT) at 250mA, <1µA shutdown current, and soft-start-used in CCD bias supplies and XDSL power rails.
For engineers reviewing the LT3461AES6#TRPBF datasheet, LT3461AES6#TRPBF pinout, LT3461AES6#TRPBF application, or LT3461AES6#TRPBF equivalent, key selection criteria include switching frequency (3MHz), feedback reference (1.255V), maximum duty cycle (82%), thermal limits (TJMAX = 125°C), and TSOT-23 package compatibility with high-density PCB layouts.
Technical Context
The LT3461AES6#TRPBF employs constant-frequency current-mode control with an internal 3MHz oscillator, ramp generator, and PWM comparator. Its error amplifier compares FB voltage against a 1.255V reference to regulate peak switch current, enabling stable line/load regulation across wide input ranges.
It integrates a low-VCE(SAT) NPN switch (260mV @ 250mA) and Schottky rectifier (800–1100mV forward drop @ 250mA), eliminating external diodes. The 6-pin TSOT-23 package supports compact designs with minimal EMI when SW trace is minimized per layout guidelines.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 3.0MHz typical - enables use of sub-10µH inductors and 1µF ceramic output capacitors for space-constrained applications. |
| Feedback Reference Voltage | 1.255V ±20mV - sets output via resistor divider (VOUT = 1.255V × (1 + R1/R2)); tolerance directly impacts output accuracy. |
| Max Output Voltage | 38V - determined by 40V-rated internal switch; supports high-voltage bias rails without external HV components. |
| Input Voltage Range | 2.5V to 16V - accommodates single Li-ion, multi-cell alkaline, or industrial 12V rails without pre-regulation. |
| Shutdown Current | <1µA - preserves battery life in always-on systems like medical diagnostics or backup power monitors. |
| Switch Current Limit | 420mA typical - defines maximum deliverable load current before foldback; critical for sizing inductor saturation current. |
| VCE(SAT) | 260mV @ 250mA - reduces conduction loss and improves efficiency at medium loads vs. discrete switch solutions. |
Pinout & Package
LT3461AES6#TRPBF is housed in a 6-lead plastic TSOT-23 (ThinSOT™) package, 1mm height, JEDEC MO-193 compliant, with exposed pad not connected internally.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Switch node | Connects to inductor; high dv/dt node requiring short, low-inductance trace to minimize EMI and ringing. |
| GND (Pin 2) | Power ground | Primary return path for switch current and IC bias; must tie directly to local ground plane. |
| FB (Pin 3) | Feedback input | Senses output via resistor divider; high-impedance (40–100nA bias) - keep trace short and away from noise sources. |
| SHDN (Pin 4) | Enable/soft-start control | Active-high logic (≥1.5V enables); RC filter here controls startup slew rate and inrush limiting. |
| VOUT (Pin 5) | Regulated output | Connects to output capacitor and feedback divider top resistor; place bulk capacitance within 2mm. |
| VIN (Pin 6) | Input supply | Requires local 1µF ceramic bypass capacitor placed adjacent to pin and ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Schottky diode | Eliminates external diode, reducing BOM count and board area while maintaining 800–1100mV forward drop at 250mA. |
| Soft-start function | Implemented via SHDN pin RC filter - prevents output overshoot and limits inrush current during startup. |
| Low-profile TSOT-23 package | 1mm height enables ultra-thin designs such as portable medical imaging modules and slim DSL modems. |
| High-voltage 40V switch | Supports 38V regulated outputs without external HV transistors - ideal for TFT-LCD gate drivers and CCD bias. |
| Constant-frequency operation | 3MHz switching yields predictable noise spectrum centered at 3MHz harmonics, simplifying EMI filtering. |
Applications
| CCD Bias Supply | XDSL Power Supply |
|---|---|
Use Scenario: Generating stable 24–36V bias for charge-coupled device sensors in digital endoscopes and industrial inspection cameras. IC Role / Device Role / Timing Role: Primary boost regulator providing regulated high-voltage rail; no timing interface required. Use Value: Integrated Schottky and 40V switch eliminate need for external HV diode and transistor, reducing component count by ≥3 parts. | Use Scenario: Providing isolated ±12V/±5V rails for analog front-end circuitry in ADSL/VDSL line cards operating from 3.3V or 5V system rails. IC Role / Device Role / Timing Role: High-efficiency step-up stage feeding secondary regulators; operates independently of DSL framing clocks. Use Value: 3MHz switching allows use of 4.7µH inductors and 1µF X7R ceramics, cutting solution size by >40% vs. 1.3MHz alternatives. |
| TFT-LCD Gate Driver Supply | Battery Backup System |
Use Scenario: Delivering 18–28V gate-on voltage for active-matrix LCD panels in handheld test equipment and portable HMIs. IC Role / Device Role / Timing Role: Standalone boost converter powering gate driver ICs; no synchronization needed with display pixel clock. Use Value: 260mV VCE(SAT) minimizes dropout at high load currents, sustaining >25mA output even at 16V input. | Use Scenario: Maintaining 5V or 12V auxiliary power during main supply interruption in network routers and UPS monitoring units. IC Role / Device Role / Timing Role: Always-on standby regulator activated only during brownout; shutdown current <1µA extends backup runtime. Use Value: Wide 2.5–16V input range accepts depleted Li-ion (2.7V) or supercapacitor (3.0V) sources without pre-boost. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-up DC/DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3461ES6#TRPBF | 1.3MHz switching frequency, 92% max duty cycle, higher current limit (600mA typ) | Better efficiency at high output voltages (>24V) and heavier loads; larger inductors required | Select when prioritizing efficiency over board area, especially for 5V→36V conversion at ≥18mA. |
| LTC3400EDC#TRMPBF | Synchronous rectification, 1.2MHz, 600mA switch current, 0.85V min input | Higher light-load efficiency, lower dropout, but no integrated Schottky - requires external diode for >5V output | Choose for battery-powered systems needing >85% efficiency below 10mA load, accepting added component count. |
Compared with LT3461ES6#TRPBF, LT3461AES6#TRPBF trades 15–20% lower efficiency for 50% smaller magnetics; versus LTC3400EDC#TRMPBF, it offers simpler design and higher output voltage capability at the cost of synchronous efficiency gains.
Availability
LT3461AES6#TRPBF is available at Aetrix Electronics and suitable for CCD bias supplies, XDSL power rails, TFT-LCD gate drivers, and battery backup systems requiring stable component supply, long-term lifecycle support, and lead-free compliance.
Supply support for LT3461AES6#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 its precision analog and power management portfolio with full backward compatibility and extended product lifecycles.
The LT3461A family was designed specifically for compact, high-voltage boost applications in portable imaging, telecom infrastructure, and industrial displays-emphasizing integration, thermal robustness, and ease of layout.
FAQ
What is the maximum output voltage achievable with the LT3461AES6#TRPBF?
The LT3461AES6#TRPBF supports up to 38V output, limited by its internal 40V-rated switch. This is confirmed in Absolute Maximum Ratings and validated in Typical Applications (e.g., 5V→36V at 18mA). Exceeding 38V risks switch breakdown and is outside guaranteed operation.
Does the LT3461AES6#TRPBF require an external Schottky diode?
No, the LT3461AES6#TRPBF integrates a Schottky diode rated for 250mA continuous current and 1.5A nonrepetitive surge. The datasheet explicitly states "integrated Schottky rectifier" in Features and eliminates external diode requirements in all Typical Application schematics.
What is the feedback reference voltage for the LT3461AES6#TRPBF, and how does it affect output accuracy?
The LT3461AES6#TRPBF uses a 1.255V feedback reference voltage with ±20mV tolerance over temperature. This directly determines output accuracy: for a 12V design (R1/R2 = 8.58), ±20mV reference error translates to ±192mV output variation, making precision resistor selection critical for tight regulation.
Can the LT3461AES6#TRPBF operate from a 2.5V input to generate 5V at 115mA?
Yes - the datasheet confirms "5V at 115mA from 3.3V Input" and specifies minimum operating voltage as 2.5V. At 2.5V input, output current capability decreases due to reduced duty cycle margin; verified performance at 115mA requires ≥2.7V input per Figure 3b's operating region plot.
How does the soft-start function work on the LT3461AES6#TRPBF?
The LT3461AES6#TRPBF implements soft-start via the SHDN pin: applying a rising voltage (e.g., through 47kΩ/47nF RC filter) gradually increases peak switch current, controlling output voltage slew rate and limiting inrush. This is documented in PIN FUNCTIONS and Figure 4, where soft-start prevents overshoot in 5V→12V designs.
LT3461AES6#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- SOT-23-6 Thin, TSOT-23-6
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Up
- Output Configuration:
- Positive
- Topology:
- Boost
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.5V
- Voltage - Input (Max):
- 16V
- Voltage - Output (Min/Fixed):
- 1.255V
- Voltage - Output (Max):
- 38V
- Current - Output:
- 300mA (Switch)
- Frequency - Switching:
- 3MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-6
LT3461AES6#TRPBF FAQ
1.How can I place an order for LT3461AES6#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3461AES6#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 LT3461AES6#TRPBF reliable?
The price and inventory of LT3461AES6#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3461AES6#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3461AES6#TRPBF?
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4.How is shipping managed for LT3461AES6#TRPBF?
LT3461AES6#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3461AES6#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 LT3461AES6#TRPBF?
For technical support, including LT3461AES6#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3461AES6#TRPBF requirements.
6.How does Aetrix verify that LT3461AES6#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3461AES6#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 LT3461AES6#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3461AES6#TRPBF?
All LT3461AES6#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3461AES6#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 LT3461AES6#TRPBF part is unused and in its original packaging.
Return procedure for LT3461AES6#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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