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Analog Devices Inc. LT3467IS6#TRPBF
- Part No.:
- LT3467IS6#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LT3467IS6#TRPBF.pdf
- Description:
- IC REG BST FLYBACK ADJ TSOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:3,011
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Product details
Overview
LT3467IS6#TRPBF from Analog Devices is a 1.3MHz, 42V, 1.1A monolithic step-up DC/DC converter in a 6-lead TSOT-23 package, featuring integrated soft-start, constant-frequency current-mode PWM control, and low 330mV VCE(SAT) at 1.1A. It delivers 5V at 540mA from a 3.3V input or 12V at 270mA from a 5V input in boost topology, targeting space-constrained portable power rails.
For engineers reviewing the LT3467IS6#TRPBF datasheet, LT3467IS6#TRPBF pinout, LT3467IS6#TRPBF application, or LT3467IS6#TRPBF equivalent, key selection criteria include input voltage range (2.4–16V), output voltage capability up to 40V, soft-start programmability via external capacitor, shutdown current <1µA, and thermal performance in I-grade (–40°C to 125°C) operation.
Technical Context
The LT3467IS6#TRPBF employs a constant-frequency current-mode PWM architecture with an internal 1.3MHz oscillator, enabling predictable noise spectrum and simplified EMI filtering. Its NPN bipolar switch features 42V breakdown and 330mV saturation voltage at 1.1A, supporting high-efficiency boost, SEPIC, and flyback topologies up to 40V output.
Soft-start is implemented via a dedicated SS pin sourcing 4µA to charge an external capacitor to 1.255V, limiting inrush current and peak switch current during startup. The feedback loop uses a precision 1.255V reference and operates with a typical maximum duty cycle of 94%, validated for stable regulation across –40°C to 125°C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching frequency | 1.3MHz - enables use of sub-5µH inductors and compact ceramic capacitors for minimal board area |
| Input voltage range | 2.4V to 16V - supports single Li-ion (2.6–4.2V), 4-cell alkaline (4–6.5V), or 5V system rail inputs |
| Output voltage capability | Up to 40V - suitable for TFT-LCD bias supplies, white LED strings, and industrial sensor excitation |
| Switch rating | 42V VCEO, 1.1A continuous - withstands transient overvoltage and delivers >540mA at 5V from 3.3V input |
| Feedback reference | 1.255V ±1.2% - sets precise output voltage via resistor divider (e.g., R1=402kΩ/R2=133kΩ for 5V) |
| Shutdown current | <1µA - preserves battery life in always-on portable devices during deep sleep modes |
| Operating temperature | –40°C to 125°C (I-grade) - qualified for automotive cabin and industrial control environments |
Pinout & Package
LT3467IS6#TRPBF is housed in a 6-lead Plastic TSOT-23 package (1.0mm max height, 2.9mm × 1.6mm footprint), optimized for thermal dissipation (θJA = 165°C/W) and high-density layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Switch collector node | Connects directly to inductor and Schottky diode anode; requires minimized trace area to reduce EMI and switching losses |
| GND (Pin 2) | Power and signal ground | Tie to local ground plane with low-inductance connection; serves as return path for switch current and feedback reference |
| FB (Pin 3) | Feedback input | Monitors output voltage via resistive divider; sensitive node requiring short, shielded routing to avoid noise coupling |
| VIN (Pin 6) | Input supply | Must be locally bypassed with ≥1µF X5R/X7R ceramic capacitor placed adjacent to pin for high-frequency decoupling |
| SS (Pin 5) | Soft-start control | Sources 4µA to external capacitor; start-up time scales linearly with capacitance (e.g., 47nF ≈ 14ms to 1.255V) |
| SHDN (Pin 4) | Enable/disable control | Logic-high (>2.4V) enables regulator; grounded or pulled low disables with <1µA quiescent draw |
Key Features
| Feature | Design Value |
|---|---|
| Integrated soft-start | Programmable rise time via single external capacitor eliminates input inrush current and prevents switch overstress during startup |
| High-voltage switch | 42V-rated NPN transistor enables 40V boost outputs without external HV components, reducing BOM count in LCD bias supplies |
| Low VCE(SAT) | 330mV at 1.1A minimizes conduction loss, sustaining >85% efficiency at 540mA/5V output from 3.3V input |
| Current-mode PWM | Predictable fixed-frequency operation simplifies EMI filter design and improves load/transient response versus voltage-mode controllers |
| I-grade temperature range | –40°C to 125°C operation ensures reliability in automotive infotainment, medical handhelds, and industrial sensors |
Applications
| Digital Camera Power Supply | White LED Backlight Driver |
|---|---|
Use Scenario: Generating 18V and –9V bias rails from a 3.3V Li-ion source for CCD sensor and LCD panel in compact digital cameras. IC Role / Device Role / Timing Role: Primary boost controller managing dual-output SEPIC/flyback configuration with soft-start sequencing to prevent display flicker. Use Value: Delivers 220mA at 18V and 10mA at –9V while maintaining <1.5% output ripple, enabled by 1.255V reference accuracy and current-mode stability. | Use Scenario: Driving parallel white LED strings requiring 24–36V from a 3.3V microcontroller rail in portable medical diagnostic equipment. IC Role / Device Role / Timing Role: Constant-current-capable boost converter operating in discontinuous conduction mode with programmable soft-start to limit inrush into LED capacitance. Use Value: Achieves 87% efficiency at 350mA output using 2.7µH inductor and MBRM140 Schottky diode, enabled by 42V switch rating and low 330mV VCE(SAT). |
| TFT-LCD Bias Supply | Industrial Sensor Excitation |
Use Scenario: Providing +9V, –9V, and +18V triple-rail bias for TFT-LCD modules in automotive displays operating across –40°C to 85°C ambient. IC Role / Device Role / Timing Role: Core boost controller in multi-winding transformer topology, leveraging I-grade temperature rating and 1.3MHz switching for compact magnetics. Use Value: Maintains ±1.5% output regulation over full temperature range and line/load transients, supported by 1.255V reference stability and current-mode loop robustness. | Use Scenario: Generating stable 24V excitation for 4–20mA current-loop pressure/temperature transmitters powered from 5V industrial bus rails. IC Role / Device Role / Timing Role: High-reliability boost converter delivering regulated 24V at 20mA with shutdown control for field device power cycling. Use Value: Sustains operation under 16V input transients and delivers <0.5% load regulation, enabled by 42V switch rating and 94% max duty cycle headroom. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3467AIS6#TRPBF | 2.1MHz switching frequency vs. 1.3MHz; lower max duty cycle (82% vs. 94%); identical pinout and package | Better suited for ultra-compact designs requiring sub-1µH inductors; reduced output current capability (430mA @5V from 3.3V vs. 540mA) | Select when board area is constrained and output current ≤430mA suffices; verify duty cycle margin for target VOUT/VIN ratio |
| LT1930IS6#TRPBF | Same 6-lead TSOT-23 pinout and footprint; 1.2MHz frequency; 40V switch rating; no dedicated soft-start pin | Lacks programmable soft-start - requires external RC network for inrush control; slightly lower efficiency due to higher VCE(SAT) | Choose when soft-start is not required and legacy compatibility with LT1930-based designs is critical |
Compared with LT3467AIS6#TRPBF, the LT3467IS6#TRPBF provides higher output current and greater duty-cycle headroom for high-ratio boosts, while LT1930IS6#TRPBF offers footprint compatibility but sacrifices soft-start integration and efficiency.
Availability
LT3467IS6#TRPBF is available at Aetrix Electronics and suitable for digital camera power supplies, white LED backlight drivers, TFT-LCD bias generation, and industrial sensor excitation requiring stable component supply across automotive and industrial temperature ranges.
Supply support for LT3467IS6#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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, communications, and industrial markets since 1965.
The LT3467 series belongs to Analog Devices' monolithic DC/DC converter product line, designed specifically for high-voltage, high-current boost applications in portable and space-constrained systems where efficiency, thermal performance, and integration are critical.
FAQ
What is the maximum output voltage achievable with the LT3467IS6#TRPBF?
The LT3467IS6#TRPBF supports output voltages up to 40V, limited by its 42V-rated internal NPN switch. This capability enables direct generation of TFT-LCD bias rails, white LED strings, and industrial sensor excitation voltages without external HV components. Operation above 40V requires external switch augmentation and is not supported by the LT3467IS6#TRPBF's internal architecture.
How does the soft-start function work on the LT3467IS6#TRPBF?
The LT3467IS6#TRPBF implements soft-start via its SS pin, which sources a precise 4µA current to charge an external capacitor to the 1.255V feedback reference. This linear ramp limits peak switch current during startup, preventing inrush into output capacitance and avoiding switch overstress. A 47nF capacitor yields ~14ms start-up time, and the feature remains active only during initial enable - the capacitor discharges rapidly upon shutdown.
Can the LT3467IS6#TRPBF be used in SEPIC topology?
Yes, the LT3467IS6#TRPBF is explicitly validated for SEPIC operation, as documented in its datasheet's typical applications (e.g., "4-Cell to 5V SEPIC Converter"). Its 42V switch rating, current-mode control, and 94% maximum duty cycle support efficient bidirectional energy transfer in SEPIC configurations. Designers must select appropriately rated coupled inductors and ensure loop compensation accounts for the right-half-plane zero inherent to SEPIC topology.
What is the recommended inductor value for a 3.3V-to-5V boost application using the LT3467IS6#TRPBF?
For a 3.3V-to-5V boost application, the LT3467IS6#TRPBF datasheet recommends a 2.7µH inductor (e.g., Sumida CR43-2R7), rated for ≥1.2A saturation current and low DCR. This value balances ripple current (≈300mA pk-pk), efficiency (>85%), and physical size. Inductor selection must also consider core material - ferrite is preferred for low losses at 1.3MHz - and placement per layout guidelines to minimize EMI coupling to the SW and FB pins.
Is the LT3467IS6#TRPBF pin-compatible with other members of the LT3467 family?
Yes, the LT3467IS6#TRPBF shares identical pinout and footprint with all S6-package variants including LT3467ES6#TRPBF (E-grade), LT3467AES6#TRPBF (A-version, E-grade), and LT3467AIS6#TRPBF (A-version, I-grade). This allows direct substitution within the same temperature grade, though functional differences - such as 1.3MHz vs. 2.1MHz switching and duty cycle limits - require verification in the target application circuit.
LT3467IS6#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, Step-Up/Step-Down
- Output Configuration:
- Positive
- Topology:
- Boost, Flyback, SEPIC
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.4V
- Voltage - Input (Max):
- 16V
- Voltage - Output (Min/Fixed):
- 1.255V
- Voltage - Output (Max):
- 40V
- Current - Output:
- 1.1A
- Frequency - Switching:
- 1.3MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-6
LT3467IS6#TRPBF FAQ
1.How can I place an order for LT3467IS6#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3467IS6#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 LT3467IS6#TRPBF reliable?
The price and inventory of LT3467IS6#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3467IS6#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3467IS6#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3467IS6#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3467IS6#TRPBF?
LT3467IS6#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3467IS6#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 LT3467IS6#TRPBF?
For technical support, including LT3467IS6#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3467IS6#TRPBF requirements.
6.How does Aetrix verify that LT3467IS6#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3467IS6#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 LT3467IS6#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3467IS6#TRPBF?
All LT3467IS6#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3467IS6#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 LT3467IS6#TRPBF part is unused and in its original packaging.
Return procedure for LT3467IS6#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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