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Analog Devices Inc. LT3461AES6#TRMPBF
- Part No.:
- LT3461AES6#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LT3461AES6#TRMPBF.pdf
- Description:
- IC REG BOOST ADJ 300MA TSOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:4,515
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Product details
Overview
LT3461AES6#TRMPBF from Analog Devices (formerly Linear Technology) is a 3MHz fixed-frequency current-mode step-up DC/DC converter with integrated Schottky diode and 260mV VCE(SAT) switch, delivering up to 70mA at 12V from 5V input or 115mA at 5V from 3.3V input in a 6-lead TSOT-23 package for space-constrained bias supply applications.
For engineers reviewing the LT3461AES6#TRMPBF datasheet, LT3461AES6#TRMPBF pinout, LT3461AES6#TRMPBF application, or LT3461AES6#TRMPBF equivalent, key selection criteria include switching frequency (3MHz), feedback reference voltage (1.255V), shutdown threshold (1.5V high / 0.4V low), soft-start capability, and 40V-rated switch for up to 38V output.
Technical Context
The LT3461AES6#TRMPBF implements constant-frequency current-mode control with an internal 3MHz oscillator, error amplifier, PWM comparator, and 0.1Ω power switch. Its architecture uses peak-current sensing with a stabilizing ramp to ensure stable regulation across line and load variations.
It integrates a Schottky rectifier (800–1100mV forward drop at 250mA) and supports external soft-start via RC network on SHDN pin. The 1.255V feedback reference enables precise output voltage setting using a resistor divider, while the 40V-rated SW pin allows operation in high-voltage boost configurations up to 38V.
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 ultra-compact designs |
| Feedback Reference Voltage | 1.255V ±20mV - sets output voltage accuracy via external resistor divider (VOUT = 1.255V × (1 + R1/R2)) |
| Max Output Voltage | 38V - determined by 40V-rated SW pin, supporting CCD bias, TFT-LCD, and XDSL applications |
| Switch VCE(SAT) | 260mV at 250mA - minimizes conduction loss and improves efficiency at medium load currents |
| Input Voltage Range | 2.5V to 16V - accommodates single-cell Li-ion, multi-cell alkaline, and industrial 3.3V/5V/12V rails |
| Shutdown Current | <1µA - ensures battery-backed systems maintain long shelf life during standby |
| Soft-Start Control | Implemented via SHDN pin with RC filter - prevents inrush current spikes and stabilizes startup transient response |
Pinout & Package
LT3461AES6#TRMPBF is housed in a 6-lead plastic TSOT-23 (ThinSOT™) package, 1mm profile, JEDEC MO-193 compliant, with exposed pad not connected internally.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Switch Node | Connects to inductor; carries high di/dt switching current - requires minimal trace length and ground plane clearance to limit EMI |
| GND (Pin 2) | Power Ground | Main return path for switch current and IC bias - must tie directly to local ground plane with low-inductance connection |
| FB (Pin 3) | Feedback Input | Senses output voltage via resistor divider; high-impedance (40–100nA bias) - sensitive to noise, requires short, shielded routing |
| SHDN (Pin 4) | Enable/Soft-Start | Logic-level shutdown (1.5V high enable / 0.4V low disable); RC filter here controls soft-start ramp time |
| VOUT (Pin 5) | Output Connection | Provides regulated output; connects to output capacitor and feedback divider - place capacitor as close as possible to this pin |
| VIN (Pin 6) | Input Supply | Accepts 2.5–16V input; requires local 1µF ceramic bypass capacitor placed adjacent to pin |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Schottky Diode | Eliminates external diode, reduces BOM count and board area; 800–1100mV VF at 250mA enables efficient 5V→12V conversion |
| 3MHz Switching Frequency | Permits use of 4.7–15µH inductors and 1µF output capacitors - cuts solution size by >40% vs. 1.3MHz LT3461 |
| Low VCE(SAT) Switch | 260mV at 250mA - lowers conduction loss, enabling 75–80% efficiency at 115mA (3.3V→5V) without thermal derating |
| Soft-Start Functionality | Implemented via SHDN pin with external RC - prevents output overshoot and limits inrush current during startup |
| Wide Input Range | 2.5V to 16V operation - supports direct connection to Li-ion, NiMH, USB, and industrial 12V supplies without pre-regulation |
Applications
| Digital Camera Power | CCD Bias Supply |
|---|---|
Use Scenario: Generating 12V rail from 3.3V or 5V main system supply to power image sensor analog front-end. IC Role / Device Role / Timing Role: Primary boost regulator providing stable, low-noise 12V bias for CCD pixel readout circuitry. Use Value: Integrated Schottky and 3MHz switching minimize EMI coupling into sensitive analog imaging paths while maintaining compact layout. | Use Scenario: Delivering programmable high-voltage bias (up to 38V) to CCD vertical/horizontal transfer gates. IC Role / Device Role / Timing Role: High-voltage boost converter with precise feedback control to set gate drive levels independent of input rail variation. Use Value: 40V-rated switch and 1.255V reference enable accurate, stable bias generation over temperature without external op-amps or DACs. |
| TFT-LCD Panel Bias | XDSL Line Driver Supply |
Use Scenario: Generating AVDD (15–20V) and VGH (25–30V) rails from 3.3V/5V logic supply for active-matrix LCD panels. IC Role / Device Role / Timing Role: Dual-rail capable boost controller (via multiple instances) delivering isolated, regulated high-side panel voltages. Use Value: 3MHz operation allows small 0603 inductors and 0805 MLCCs - critical for thin-profile portable display modules. | Use Scenario: Providing clean ±12V or +24V supply for DSL line driver amplifiers in residential gateway modems. IC Role / Device Role / Timing Role: Efficient, low-EMI boost stage feeding linear regulators that supply noise-sensitive analog line drivers. Use Value: Constant-frequency operation yields predictable noise spectrum easily filtered with simple LC stages, meeting DSL spectral mask requirements. |
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#TRMPBF | 1.3MHz switching frequency, 92% max duty cycle, higher efficiency at >50mA loads | Better suited for 5V→36V or high-current 3.3V→15V where size is less critical than efficiency | Select when output current exceeds 70mA or inrush current management is critical - avoids 3MHz switching losses |
| LTC3400ES6#TRMPBF | Synchronous rectification, 1.2MHz, 600mA switch current limit, no integrated Schottky | Higher output current capability but requires external diode; lower quiescent current (19µA vs. 2.8mA) | Choose for 3.3V→5V/12V at >100mA where efficiency and light-load IQ matter more than component count |
Compared with LT3461ES6#TRMPBF and LTC3400ES6#TRMPBF, the LT3461AES6#TRMPBF trades peak efficiency and current capability for significantly smaller passive components and faster transient response due to its 3MHz operation and integrated Schottky - ideal for compact, moderate-power bias supplies.
Availability
LT3461AES6#TRMPBF is available at Aetrix Electronics and suitable for digital camera power, CCD bias supply, TFT-LCD panel bias, XDSL line driver supply, and medical diagnostic equipment requiring stable component supply with full traceability and lifecycle support.
Supply support for LT3461AES6#TRMPBF 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 rigorous reliability testing and automotive-grade qualification options.
The LT3461A family was designed specifically for compact, high-voltage bias generation in imaging, telecom, and industrial instrumentation - emphasizing integration, thermal robustness, and ease of layout in space-constrained applications.
FAQ
What is the maximum output voltage achievable with the LT3461AES6#TRMPBF?
The LT3461AES6#TRMPBF supports up to 38V output voltage, limited by its 40V-rated switch node (SW pin). This is confirmed in Absolute Maximum Ratings and validated in Typical Applications circuits generating 15V, 12V, and 36V outputs. Operation beyond 38V risks exceeding the SW pin voltage rating and is not supported.
Does the LT3461AES6#TRMPBF require an external Schottky diode?
No, the LT3461AES6#TRMPBF integrates a Schottky diode with 800–1100mV forward voltage at 250mA, eliminating the need for an external diode. This is explicitly stated in the FEATURES section and verified in all Typical Application schematics, including the 5V→12V and 3.3V→5V examples.
What is the feedback reference voltage for the LT3461AES6#TRMPBF, and how is output voltage set?
The LT3461AES6#TRMPBF has a 1.255V feedback reference voltage (typical, ±20mV over temperature), as specified in Electrical Characteristics. Output voltage is set using a resistor divider: VOUT = 1.255V × (1 + R1/R2), where R2 connects FB to GND and R1 connects VOUT to FB.
Can the LT3461AES6#TRMPBF be used with a 2.5V input supply?
Yes, the LT3461AES6#TRMPBF operates down to 2.5V input, as specified in Minimum Operating Voltage (2.5V) in Electrical Characteristics. It successfully delivers 5V at 115mA from 3.3V and 12V at 70mA from 5V - both within the 2.5–16V range - confirming functionality at the lower limit.
How does soft-start work on the LT3461AES6#TRMPBF?
Soft-start on the LT3461AES6#TRMPBF is implemented via the SHDN pin: applying a rising voltage through an RC network (e.g., 47kΩ + 47nF) ramps the enable threshold, delaying full switching until the output reaches regulation. This is documented in PIN FUNCTIONS and demonstrated in Figure 4 (Typical Application with Soft-Start Circuit).
LT3461AES6#TRMPBF 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#TRMPBF FAQ
1.How can I place an order for LT3461AES6#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3461AES6#TRMPBF 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#TRMPBF reliable?
The price and inventory of LT3461AES6#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3461AES6#TRMPBF is usually 5 days.
3.What payment methods are accepted for LT3461AES6#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3461AES6#TRMPBF transactions.
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4.How is shipping managed for LT3461AES6#TRMPBF?
LT3461AES6#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3461AES6#TRMPBF 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#TRMPBF?
For technical support, including LT3461AES6#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3461AES6#TRMPBF requirements.
6.How does Aetrix verify that LT3461AES6#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LT3461AES6#TRMPBF 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#TRMPBF meets industry standards.
7.What is the process for return or replacement of LT3461AES6#TRMPBF?
All LT3461AES6#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3461AES6#TRMPBF, 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#TRMPBF part is unused and in its original packaging.
Return procedure for LT3461AES6#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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