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Analog Devices Inc. LT3467AIDDB#TRMPBF
- Part No.:
- LT3467AIDDB#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LT3467AIDDB#TRMPBF.pdf
- Description:
- IC REG BST FLYBACK ADJ 1.1A 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:427
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Product details
Overview
LT3467AIDDB#TRMPBF from Analog Devices is a 2.1MHz, 42V, 1.1A monolithic step-up DC/DC converter with integrated soft-start, housed in an 8-lead (3mm × 2mm) DFN package rated for –40°C to 125°C operation. It delivers 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 industrial and automotive systems.
For engineers reviewing the LT3467AIDDB#TRMPBF datasheet, LT3467AIDDB#TRMPBF pinout, LT3467AIDDB#TRMPBF application, or LT3467AIDDB#TRMPBF equivalent, key selection criteria include its 2.1MHz switching frequency enabling sub-1µH inductors, 330mV VCE(SAT) at 1.1A, programmable soft-start via external capacitor, 2.4V–16V input range, and 42V switch rating for up to 40V output designs.
Technical Context
The LT3467AIDDB#TRMPBF employs constant-frequency current-mode PWM control with a dedicated soft-start pin that sources 4µA to charge an external capacitor, limiting inrush current and peak switch current during startup. Its internal 42V NPN bipolar switch features low 330mV saturation voltage at 1.1A, enabling high-efficiency operation across wide duty cycles.
It operates over –40°C to 125°C junction temperature, supports feedback regulation via a 1.255V reference, and integrates oscillator, error amplifier, ramp generator, and current-sense circuitry. The device is AEC-Q100 qualified and pin-compatible with LT1930/LT1613 for drop-in upgrades in existing designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 2.1MHz - enables use of ≤1µH inductors and compact ceramic capacitors, reducing board area and height. |
| Input Voltage Range | 2.4V to 16V - supports single Li-ion (2.6–4.2V), 4-cell alkaline (4–6.5V), or 5V rail inputs without external regulators. |
| Output Voltage Capability | Up to 40V - suitable for high-voltage bias supplies (e.g., TFT-LCD), xDSL, and industrial sensor interfaces. |
| Switch Current Limit | 1.4A typical - protects internal transistor and external components during overload or short-circuit conditions. |
| VCE(SAT) | 330mV at 1.1A - minimizes conduction loss, improving efficiency especially at high load currents. |
| Feedback Reference | 1.255V - sets output voltage via resistor divider (VOUT = 1.255V × (1 + R1/R2)), enabling precise regulation with standard 1% resistors. |
| Soft-Start Current | 4µA - charges external capacitor linearly to 1.255V, allowing predictable, user-defined startup time and inrush control. |
| Shutdown Current | <1µA - ensures minimal battery drain in standby mode for portable and always-on applications. |
Pinout & Package
LT3467AIDDB#TRMPBF uses an 8-lead (3mm × 2mm) plastic DFN package with exposed pad (Pin 9) soldered to PCB ground for thermal and electrical performance. Package height is 0.75mm, compatible with automated assembly and space-constrained layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (FB) | Feedback Input | Connects to resistor divider tap; regulates output by comparing divided voltage to 1.255V internal reference. |
| Pins 2 & 5 (GND) | Ground Return | Low-impedance return path for power and signal; exposed pad (Pin 9) must be soldered to PCB ground plane. |
| Pins 3 & 4 (SW) | Switch Collector | Drives external inductor/diode; high dv/dt node requiring minimized trace area to reduce EMI. |
| Pin 6 (VIN) | Input Supply | Accepts 2.4–16V input; requires local 1–4.7µF ceramic bypass capacitor placed adjacent to pin. |
| Pin 7 (SS) | Soft-Start Control | Sources 4µA to external capacitor; voltage ramp controls startup current slew rate and output rise time. |
| Pin 8 (SHDN) | Enable/Shutdown | Logic-level input: ≥2.4V enables regulator, ≤0.5V disables with <1µA quiescent current. |
Key Features
| Feature | Design Value |
|---|---|
| 2.1MHz fixed-frequency operation | Reduces required inductor size to ≤0.9µH and enables use of small 0402/0603 MLCCs, cutting solution footprint by >40% vs 1.3MHz alternatives. |
| Programmable soft-start | External capacitor sets controlled output voltage ramp, eliminating input inrush and preventing switch overstress in high-voltage (>30V) boost applications. |
| 42V, 1.1A integrated NPN switch | Eliminates external transistor and driver, simplifying design while supporting 40V outputs and SEPIC/flyback topologies without added components. |
| 1.255V precision feedback reference | Enables stable output regulation across temperature (±10mV drift from –40°C to 125°C) using standard 1% resistors without trimming. |
| AEC-Q100 qualified (Grade I) | Validated for automotive under-hood and infotainment applications with guaranteed operation from –40°C to 125°C junction temperature. |
| Pin-for-pin compatibility with LT1930/LT1613 | Allows direct replacement in legacy designs to upgrade switching frequency and efficiency without PCB revision. |
Applications
| Digital Camera Power Supply | White LED Backlight Driver |
|---|---|
Use Scenario: Generating 15V at 135mA from a 3.3V system rail to drive white LEDs in compact digital cameras. IC Role / Device Role / Timing Role: Step-up DC/DC converter providing regulated high-voltage bias with fast transient response and low noise. Use Value: Enables 15V output using only a 6.8µH inductor and 2.2µF ceramic output capacitor, minimizing solution size and EMI in camera modules. | Use Scenario: Supplying 5V at 430mA to LED strings in smartphone or tablet displays powered from a single Li-ion cell (3.3V nominal). IC Role / Device Role / Timing Role: High-efficiency boost regulator with soft-start to prevent LED flash during power-on. Use Value: Delivers full 430mA load at 3.3V input with >85% efficiency and eliminates inrush-induced display flicker via programmable soft-start. |
| TFT-LCD Bias Supply | xDSL Line Card Power |
Use Scenario: Generating triple outputs (±9V, 18V) from 3.3V for TFT-LCD panel bias in automotive instrument clusters. IC Role / Device Role / Timing Role: Primary boost controller in multi-output flyback or charge-pump-derived topology. Use Value: Supports 40V maximum output and AEC-Q100 qualification, meeting automotive reliability and voltage requirements without derating. | Use Scenario: Providing isolated 40V at 20mA from a 5V system rail for xDSL line drivers in telecom access equipment. IC Role / Device Role / Timing Role: High-voltage boost stage delivering stable, low-noise bias for analog front-end circuits. Use Value: Achieves 40V output with <1% regulation error using standard 1% feedback resistors and 42V-rated internal switch. |
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 |
|---|---|---|---|
| LT3467EDDB#TRMPBF | 1.3MHz switching frequency; rated for –40°C to 85°C; identical pinout and feature set except lower frequency and temperature grade. | Lower frequency requires larger inductors (≥4.7µH); unsuitable for automotive or extended-temperature industrial use. | Select when cost sensitivity outweighs size constraints and ambient temperature remains below 85°C. |
| LT3467AIS6#TRMPBF | Same 2.1MHz frequency and –40°C to 125°C rating but in 6-lead TSOT-23 package; lower thermal performance (θJA = 165°C/W vs 80°C/W). | Reduced power handling due to smaller package; limited to ≤300mA loads in high-ambient environments. | Select only for ultra-low-profile applications where thermal headroom is sufficient and output current ≤300mA. |
Compared with LT3467EDDB#TRMPBF, LT3467AIDDB#TRMPBF delivers 62% higher switching frequency for smaller passives and extends operating temperature to 125°C; versus LT3467AIS6#TRMPBF, it provides superior thermal dissipation and supports 1.1A continuous output in the same footprint.
Availability
LT3467AIDDB#TRMPBF is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial sensor transmitters, and medical diagnostic equipment requiring stable component supply, AEC-Q100 compliance, and high-reliability 125°C operation.
Supply support for LT3467AIDDB#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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LT3467/LT3467A product line delivers highly integrated, high-voltage boost converters optimized for compact, efficient power conversion in space- and thermal-constrained applications such as portable imaging, display bias, and telecom infrastructure.
FAQ
What is the maximum output voltage achievable with the LT3467AIDDB#TRMPBF?
The LT3467AIDDB#TRMPBF supports output voltages up to 40V, enabled by its 42V-rated internal NPN switch. This capability allows implementation of boost, SEPIC, and flyback topologies for applications like TFT-LCD bias supplies and xDSL line drivers. Output voltage is set externally via a resistor divider referenced to the 1.255V internal feedback voltage, and stability must be verified per application-specific compensation requirements.
Does the LT3467AIDDB#TRMPBF require an external diode, and what type is recommended?
Yes, the LT3467AIDDB#TRMPBF requires an external Schottky diode connected between the SW pin and output. For outputs ≤20V, Philips PMEG2005 or On Semiconductor MBRM120 is recommended; for 30V outputs, PMEG3005; and for 40V outputs, PMEG4005 or MBRM140. Diode selection must account for average forward current, reverse voltage rating, and thermal performance-especially critical in high-duty-cycle or high-ambient-temperature applications.
How does the soft-start function operate on the LT3467AIDDB#TRMPBF, and how is it configured?
The LT3467AIDDB#TRMPBF's soft-start pin (SS) sources a precise 4µA current to charge an external capacitor to 1.255V. The resulting voltage ramp controls the error amplifier's reference, limiting peak switch current during startup. A 47nF capacitor yields ~15ms startup; values from 10nF to 200nF allow tuning. Leaving SS floating disables soft-start. The capacitor must fully discharge before re-enabling after shutdown to avoid premature current limiting.
Can the LT3467AIDDB#TRMPBF be used in SEPIC topology, and what are the key design considerations?
Yes, the LT3467AIDDB#TRMPBF supports SEPIC topology, as confirmed by application circuits in its datasheet (e.g., Figure TA03). Key considerations include selecting coupled or uncoupled inductors rated for ≥1.2A saturation current, using low-ESR ceramic output/input capacitors, ensuring proper grounding of the coupled inductor center tap (if used), and compensating the voltage loop for right-half-plane zero effects. Efficiency and output ripple depend heavily on diode and inductor selection.
What is the thermal performance difference between the DFN and TSOT-23 packages for the LT3467A series?
The LT3467AIDDB#TRMPBF in 8-lead DFN (3mm × 2mm) has θJA = 80°C/W and θJC = 10°C/W with proper exposed-pad soldering, enabling 1.1A continuous operation at 125°C ambient. In contrast, the LT3467AIS6#TRMPBF in 6-lead TSOT-23 has θJA = 165°C/W and no exposed thermal pad, limiting practical continuous current to ~300mA in high-ambient environments. Thermal design must prioritize copper area and vias under the DFN's exposed pad.
LT3467AIDDB#TRMPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-WFDFN Exposed Pad
- 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:
- 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#TRMPBF FAQ
1.How can I place an order for LT3467AIDDB#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3467AIDDB#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 LT3467AIDDB#TRMPBF reliable?
The price and inventory of LT3467AIDDB#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3467AIDDB#TRMPBF is usually 5 days.
3.What payment methods are accepted for LT3467AIDDB#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3467AIDDB#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3467AIDDB#TRMPBF?
LT3467AIDDB#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3467AIDDB#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 LT3467AIDDB#TRMPBF?
For technical support, including LT3467AIDDB#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3467AIDDB#TRMPBF requirements.
6.How does Aetrix verify that LT3467AIDDB#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LT3467AIDDB#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 LT3467AIDDB#TRMPBF meets industry standards.
7.What is the process for return or replacement of LT3467AIDDB#TRMPBF?
All LT3467AIDDB#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3467AIDDB#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 LT3467AIDDB#TRMPBF part is unused and in its original packaging.
Return procedure for LT3467AIDDB#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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