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Analog Devices Inc. LT3461ES6#TRPBF
- Part No.:
- LT3461ES6#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LT3461ES6#TRPBF.pdf
- Description:
- IC REG BOOST ADJ 300MA TSOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:3,351
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Product details
Overview
LT3461ES6#TRPBF from Analog Devices (formerly Linear Technology) is a 1.3MHz fixed-frequency current-mode step-up DC/DC converter with integrated Schottky diode and 260mV VCE(SAT) switch, delivering up to 38V output from 2.5V–16V input, used in compact CCD bias and TFT-LCD supply designs.
For engineers reviewing the LT3461ES6#TRPBF datasheet, LT3461ES6#TRPBF pinout, LT3461ES6#TRPBF application, or LT3461ES6#TRPBF equivalent, key selection criteria include switching frequency (1.3MHz), feedback voltage (1.255V), maximum duty cycle (92%), 40V switch rating, and SOT-23-6 thermal performance under 250mA load.
Technical Context
The LT3461ES6#TRPBF employs constant-frequency current-mode control with an internal 1.255V reference and ramp-compensated PWM comparator. Its 1.3MHz oscillator enables small external magnetics while maintaining predictable EMI profile and stable loop response across 2.5V–16V input range.
It integrates a 40V-rated NPN switch and Schottky rectifier in a single TSOT-23-6 package, supporting soft-start via RC-filtered SHDN pin and delivering regulated output using external resistor divider on FB pin with ≤100nA bias current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 1.3MHz - Enables use of ≤10µH inductors and 1µF ceramic output capacitors for space-constrained designs. |
| Feedback Voltage | 1.255V - Sets output via R1/R2 divider; tolerance ±20mV ensures <±1.6% VOUT accuracy over temperature. |
| Max Output Voltage | 38V - Supported by 40V-rated internal switch; suitable for high-voltage bias rails without external HV components. |
| VCE(SAT) @ 250mA | 260mV - Minimizes conduction loss at full load; contributes to >75% efficiency at 12V/70mA from 5V input. |
| Input Voltage Range | 2.5V to 16V - Supports single-cell Li-ion, multi-cell alkaline, and industrial 12V rail inputs without pre-regulation. |
| Shutdown Current | <1µA - Enables battery-backed systems to maintain >1-year shelf life with minimal quiescent drain. |
| Package | SOT-23-6 (TSOT-23) - 1mm height, 2.9mm × 1.6mm footprint; compatible with standard reflow and automated assembly. |
Pinout & Package
LT3461ES6#TRPBF uses a 6-lead plastic TSOT-23 package (1mm height, JEDEC MO-193 compliant), with exposed pad not connected internally. Thermal resistance θJA = 150°C/W on 1-in² ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Switch Node | Connects to inductor; carries high di/dt pulsed current-requires short, wide trace to minimize EMI and voltage spikes. |
| GND (Pin 2) | Power Ground | Primary return path for switch current and IC bias; must tie directly to low-impedance local ground plane. |
| FB (Pin 3) | Feedback Input | Senses output via resistor divider; 100nA bias current allows high-value dividers to reduce power loss. |
| SHDN (Pin 4) | Enable/Soft-Start | Logic-high ≥1.5V enables operation; RC filter here controls startup slew rate and inrush limiting. |
| VOUT (Pin 5) | Output Connection | Provides regulated output; requires local 1µF ceramic capacitor placed adjacent to pin and GND plane. |
| VIN (Pin 6) | Input Supply | Accepts 2.5V–16V; must be bypassed with 1µF ceramic capacitor close to pin to suppress input ripple. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Schottky Diode | Eliminates external diode, reducing BOM count and PCB area; forward drop ~800mV at 250mA avoids need for HV Schottky selection. |
| Low VCE(SAT) Switch | 260mV at 250mA reduces conduction loss by ~30% vs. typical 400mV switches, improving efficiency in medium-current boost stages. |
| Fixed 1.3MHz Frequency | Enables consistent EMI filtering design and predictable noise spectrum; avoids variable-frequency jitter issues in sensitive analog circuits. |
| Soft-Start via SHDN Pin | RC network on SHDN controls output ramp rate, preventing inrush current overshoot into large output capacitors (e.g., >10µF). |
| Wide Input Range | 2.5V–16V operation supports direct connection to unregulated battery stacks or industrial rails without LDO pre-regulation. |
Applications
| Digital Camera CCD Bias Supply | TFT-LCD Panel Gate Driver Supply |
|---|---|
Use Scenario: Generating +15V bias for CCD sensor analog front-end in portable digital cameras with 3.3V main rail. IC Role / Device Role / Timing Role: Step-up regulator providing stable, low-noise high-voltage rail; operates in discontinuous conduction mode at light loads. Use Value: Integrated Schottky and 1.3MHz switching allow single-chip solution with 10µH inductor and 2.2µF X5R capacitor-reducing board area by 40% vs. discrete alternatives. | Use Scenario: Powering gate-on voltage (+20V) and gate-off voltage (–5V) for active-matrix LCD panels in medical displays. IC Role / Device Role / Timing Role: Primary positive boost stage in dual-rail charge-pump-assisted architecture; synchronized via external clock for EMI control. Use Value: 40V switch rating and 92% max duty cycle support 36V output needed for gate drivers; soft-start prevents panel flicker during power-up. |
| XDSL Line Card Auxiliary Supply | Battery-Backed Medical Diagnostic Equipment |
Use Scenario: Deriving isolated 5V/115mA auxiliary rail from 3.3V system bus in DSLAM line cards with strict thermal limits. IC Role / Device Role / Timing Role: Non-isolated boost converter feeding downstream isolated DC/DC; operates continuously at ambient up to 70°C. Use Value: 1.3MHz frequency permits 4.7µH inductor with <1mm height; <1µA shutdown current extends backup runtime during AC loss events. | Use Scenario: Maintaining real-time clock and SRAM retention during main power failure in portable ultrasound units using Li-ion + supercapacitor backup. IC Role / Device Role / Timing Role: Low-quiescent boost regulator sustaining 3.3V logic rail from depleting 2.7V battery cell. Use Value: 2.5V minimum start-up voltage and <1µA shutdown current enable >18-month shelf life; SOT-23-6 footprint fits tight battery compartment layouts. |
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 |
|---|---|---|---|
| LT3461AES6#TRPBF | 3MHz switching frequency, 82% max duty cycle, lower max output current (60mA vs. 70mA at 12V). | Better suited for ultra-compact designs where inductor/capacitor size outweighs efficiency loss. | Select when board area is constrained and 3MHz allows smaller passives; avoid if >70mA 12V output required. |
| LT3460ES6#TRPBF | Same 1.3MHz frequency but SC70-6 package, 36V max output, no integrated Schottky (external diode required). | Requires external 40V Schottky, increasing component count and layout complexity. | Choose only if SC70 footprint is mandatory and external diode integration is acceptable for cost or thermal reasons. |
Compared with LT3461ES6#TRPBF, LT3461AES6#TRPBF trades 15% efficiency for 40% smaller magnetics, while LT3460ES6#TRPBF sacrifices integration and adds layout overhead to achieve identical frequency and similar voltage capability.
Availability
LT3461ES6#TRPBF is available at Aetrix Electronics and suitable for CCD bias supplies, TFT-LCD panel drivers, and XDSL auxiliary power applications requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for LT3461ES6#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, datasheet archives, and application engineering for legacy Linear parts including the LT3461 series.
The LT3461 family was designed specifically for space-constrained, medium-power boost applications in imaging, telecom, and portable medical equipment-emphasizing integration, thermal efficiency, and ease of layout.
FAQ
What is the maximum output voltage achievable with the LT3461ES6#TRPBF?
The LT3461ES6#TRPBF supports up to 38V output voltage, limited by its internal 40V-rated switch. This is confirmed in the Absolute Maximum Ratings table and validated in Typical Application circuits delivering 36V at 18mA. Exceeding 38V risks violating the 40V VSW rating and may cause premature failure. Designers should maintain ≥2V margin below 40V for reliability.
Does the LT3461ES6#TRPBF require an external Schottky diode?
No, the LT3461ES6#TRPBF integrates a Schottky diode rated for 250mA continuous current and 1.5A non-repetitive surge. The datasheet explicitly states "integrated Schottky rectifier" in Features and omits external diode requirements in all Typical Application schematics. Using an external diode would degrade efficiency and increase footprint unnecessarily.
What is the feedback reference voltage for the LT3461ES6#TRPBF and how does it affect output setting?
The LT3461ES6#TRPBF has a precise 1.255V feedback reference voltage (typical), with guaranteed range 1.225V to 1.280V over temperature. Output voltage is set by VOUT = 1.255V × (1 + R1/R2), where R1 connects to VOUT and R2 to GND. This 1.255V value is used in all application examples-including 12V and 15V designs-and determines divider resistor tolerance impact on final accuracy.
Can the LT3461ES6#TRPBF operate from a 2.5V input to generate 5V at 115mA?
Yes, the LT3461ES6#TRPBF is specified for 2.5V minimum input and delivers 5V at 115mA from 3.3V input per Typical Application TA03a. At 2.5V input, output current capability decreases due to reduced duty cycle margin and higher switch stress; the datasheet confirms stable operation down to 2.5V but recommends verifying thermal performance at full load in actual layout.
What package type and dimensions does the LT3461ES6#TRPBF use?
The LT3461ES6#TRPBF uses a 6-lead TSOT-23 package (S6), measuring 2.9mm × 1.6mm × 1.0mm max height, per LTC DWG #05-08-1636. It is JEDEC MO-193 compliant, with 0.95mm pitch and pin 1 identifier notch. This low-profile package enables placement in height-sensitive applications like handheld medical devices and slim camera modules.
LT3461ES6#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:
- 1.3MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-6
LT3461ES6#TRPBF FAQ
1.How can I place an order for LT3461ES6#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3461ES6#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 LT3461ES6#TRPBF reliable?
The price and inventory of LT3461ES6#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3461ES6#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3461ES6#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3461ES6#TRPBF transactions.
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4.How is shipping managed for LT3461ES6#TRPBF?
LT3461ES6#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3461ES6#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 LT3461ES6#TRPBF?
For technical support, including LT3461ES6#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3461ES6#TRPBF requirements.
6.How does Aetrix verify that LT3461ES6#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3461ES6#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 LT3461ES6#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3461ES6#TRPBF?
All LT3461ES6#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3461ES6#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 LT3461ES6#TRPBF part is unused and in its original packaging.
Return procedure for LT3461ES6#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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