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Analog Devices Inc. LT3467AIDDB
- Part No.:
- LT3467AIDDB
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LT3467AIDDB.pdf
- Description:
- IC REG BST FLYBACK ADJ 1.1A 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,558
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Product details
Overview
LT3467AIDDB from Analog Devices is a 2.1MHz, 42V, 1.1A monolithic step-up DC/DC converter with integrated soft-start and bipolar switch in an 8-lead (3mm × 2mm) DFN package. It delivers up to 5V at 430mA from a 3.3V input or 15V at 135mA from the same supply, targeting space-constrained boost, SEPIC, and flyback power stages in portable electronics.
For engineers reviewing the LT3467AIDDB datasheet, LT3467AIDDB pinout, LT3467AIDDB application, or LT3467AIDDB equivalent, key selection criteria include its 2.1MHz switching frequency for ultra-small passive sizing, 42V switch rating enabling 40V output capability, programmable soft-start via external capacitor, 1.255V feedback reference, and –40°C to 125°C industrial temperature grade.
Technical Context
The LT3467AIDDB employs constant-frequency current-mode PWM control with a 2.1MHz oscillator, delivering predictable noise spectra and stable regulation across line and load. Its internal 42V NPN bipolar switch features low 330mV VCE(SAT) at 1.1A, enabling high-efficiency operation without external gate drivers.
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 stress during startup. The device supports wide input (2.4V–16V), regulates output up to 40V, and integrates feedback error amplification with 1.255V reference and ±50nA bias current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching frequency | 2.1MHz - enables use of sub-1µH inductors (e.g., 0.9µH) and compact ceramic capacitors |
| Max switch voltage | 42V - supports boost outputs up to 40V and SEPIC/flyback topologies with ≥2V headroom |
| Feedback reference | 1.255V ±1.2% - sets precise output voltage via resistor divider (VOUT = 1.255V × (1 + R1/R2)) |
| Input voltage range | 2.4V to 16V - accommodates single Li-ion (2.6–4.2V), 4-cell alkaline (4–6.5V), or 5V/12V rails |
| Soft-start current | 4µA - charges external capacitor linearly to 1.255V, controlling output ramp rate and inrush |
| Shutdown current | <1µA - minimizes battery drain in standby mode for portable systems |
| Operating temp | –40°C to +125°C - qualified for industrial and automotive-adjacent embedded applications |
Pinout & Package
LT3467AIDDB is housed in an 8-lead (3mm × 2mm) plastic DFN package with exposed pad (Pin 9) soldered to PCB ground for thermal management. Package height is 0.75mm max.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FB (Pin 1) | Feedback input | Connects to resistive divider tap; 1.255V reference sets output regulation point |
| GND (Pins 2, 5, 9) | Ground return | Multiple GND pins and exposed pad reduce impedance and improve thermal dissipation |
| SW (Pins 3, 4) | Switch collector | Drives external inductor/diode; high di/dt node requiring minimal trace area to limit EMI |
| VIN (Pin 6) | Input supply | Must be locally bypassed with ≥1µF ceramic capacitor placed adjacent to pin |
| SS (Pin 7) | Soft-start control | Sources 4µA to external capacitor; floating disables soft-start |
| SHDN (Pin 8) | Enable/disable input | Logic-high ≥2.4V enables regulator; ≤0.5V shuts down with <1µA quiescent draw |
Key Features
| Feature | Design Value |
|---|---|
| 2.1MHz fixed-frequency operation | Reduces inductor size by >50% vs 1.3MHz LT3467; enables 0.9µH–6.8µH inductors |
| 42V, 1.1A bipolar switch with 330mV VCE(SAT) | Eliminates need for external MOSFET driver; sustains high current in small footprint |
| Dedicated soft-start pin with 4µA current source | Prevents input inrush and switch overcurrent during startup; configurable ramp time |
| 1.255V precision feedback reference | Enables accurate output setting across temperature; ±1.2% tolerance over full operating range |
| –40°C to +125°C operating junction range | Supports industrial and extended-temperature designs without derating or heatsinking |
Applications
| Portable Medical Sensors | White LED Backlighting |
|---|---|
Use Scenario: Compact handheld diagnostic device powered by single Li-ion cell requiring stable 5V rail for microcontroller and analog front-end. IC Role / Device Role / Timing Role: Step-up DC/DC converter generating regulated 5V at 430mA from 3.3V nominal input. Use Value: 2.1MHz switching allows 0.9µH inductor and 22µF ceramic output cap, reducing board area by >40% vs lower-frequency alternatives. | Use Scenario: TFT-LCD display in industrial HMI panel needing dual 9V and –9V bias supplies from 3.3V logic rail. IC Role / Device Role / Timing Role: Core boost controller in triple-output flyback-derived topology delivering ±9V/10mA and 18V/10mA. Use Value: 42V switch rating and precise 1.255V reference ensure stable high-voltage bias generation with <±2% output tolerance. |
| DSL Modem Power | Industrial IoT Node |
Use Scenario: xDSL line card requiring isolated 15V/135mA supply from shared 3.3V system bus. IC Role / Device Role / Timing Role: High-voltage boost converter implementing non-isolated 3.3V-to-15V conversion. Use Value: 2.1MHz operation and low 330mV VCE(SAT) achieve >82% efficiency at full load while fitting within tight thermal envelope. | Use Scenario: Battery-powered sensor node with intermittent RF transmission, demanding ultra-low shutdown current. IC Role / Device Role / Timing Role: Primary 3.3V-to-5V boost supply enabling USB-C charging and MCU wake-up sequencing. Use Value: <1µA shutdown current extends shelf life; programmable soft-start prevents brownout during cold-start from depleted battery. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3467IS6#TRPBF | Same architecture but 1.3MHz switching, 6-lead TSOT-23 package, identical 42V/1.1A switch | Lower switching frequency requires larger inductors (≥4.7µH); thinner profile (1mm) but lower thermal mass | Select when board space is constrained vertically and 1.3MHz passives are acceptable |
| LT3467AEDDB#TRPBF | Identical electrical specs and DFN package, but rated for –40°C to +85°C only | Not qualified for extended temperature operation; unsuitable for industrial environments above 85°C | Select only for commercial-grade applications where ambient temperature remains below 85°C |
Compared with LT3467IS6#TRPBF, the LT3467AIDDB offers higher frequency for smaller passives and superior thermal performance via DFN exposed pad; compared with LT3467AEDDB#TRPBF, it adds full industrial temperature support without trade-offs in size or efficiency.
Availability
LT3467AIDDB is available at Aetrix Electronics and suitable for portable medical sensors, white LED backlighting, DSL modem power, and industrial IoT node designs requiring stable component supply, long-term lifecycle assurance, and guaranteed industrial-temperature performance.
Supply support for LT3467AIDDB 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 industrial, communications, automotive, and healthcare markets.
The LT3467/LT3467A product line delivers highly integrated, high-voltage boost converters optimized for space- and efficiency-critical portable and industrial power applications, emphasizing small-footprint magnetics, robust startup behavior, and wide input/output flexibility.
FAQ
What is the maximum output voltage achievable with the LT3467AIDDB?
The LT3467AIDDB supports up to 40V output voltage, limited by its 42V-rated internal bipolar switch and sufficient headroom for diode forward drop and switch saturation voltage. This makes it suitable for high-voltage boost, SEPIC, and flyback configurations-e.g., generating 40V at 20mA from a 5V input as shown in the typical application circuit TA04a.
How does the soft-start function work on the LT3467AIDDB?
The LT3467AIDDB implements soft-start via its SS pin, which sources a precise 4µA current to charge an external capacitor to 1.255V. As the capacitor voltage ramps, it controls the error amplifier's output, limiting peak switch current during startup. Typical capacitor values range from 10nF to 200nF, allowing design-adjustable ramp times without additional circuitry.
Can the LT3467AIDDB replace the LT3467EDDB in an existing design?
The LT3467AIDDB is not a direct drop-in replacement for the LT3467EDDB due to differing switching frequencies (2.1MHz vs 1.3MHz) and temperature grades (–40°C to 125°C vs –40°C to 85°C). Inductor and compensation values must be re-optimized; however, pinout and basic functionality remain compatible per Analog Devices' documentation.
What package type and thermal characteristics does the LT3467AIDDB use?
The LT3467AIDDB uses an 8-lead (3mm × 2mm) plastic DFN package with exposed thermal pad (Pin 9), specified with θJA = 80°C/W. The exposed pad must be soldered to a PCB ground plane to achieve rated thermal performance and sustain full 1.1A switch current at elevated ambient temperatures.
Which external components are critical for stable operation of the LT3467AIDDB?
Critical external components for the LT3467AIDDB include: a low-DCR inductor (0.9µH–6.8µH, rated ≥1.2A), Schottky diode (e.g., PMEG2010 for ≤20V or MBRM140 for ≤40V), input bypass capacitor (≥1µF X5R/X7R ceramic near VIN), output capacitor (10µF–22µF low-ESR ceramic), and soft-start capacitor (10nF–200nF on SS pin). Layout must minimize SW and FB trace areas.
LT3467AIDDB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-WFDFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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:
- 2.1MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (3x2)
LT3467AIDDB FAQ
1.How can I place an order for LT3467AIDDB through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3467AIDDB 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 LT3467AIDDB reliable?
The price and inventory of LT3467AIDDB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3467AIDDB is usually 5 days.
3.What payment methods are accepted for LT3467AIDDB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3467AIDDB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3467AIDDB?
LT3467AIDDB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3467AIDDB 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 LT3467AIDDB?
For technical support, including LT3467AIDDB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3467AIDDB requirements.
6.How does Aetrix verify that LT3467AIDDB is sourced from the original manufacturer or authorized distributors?
All LT3467AIDDB 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 LT3467AIDDB meets industry standards.
7.What is the process for return or replacement of LT3467AIDDB?
All LT3467AIDDB units undergo pre-shipment inspection (PSI). If there is an issue with LT3467AIDDB, 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 LT3467AIDDB part is unused and in its original packaging.
Return procedure for LT3467AIDDB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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