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Analog Devices Inc. LT3467AIDDB#TRPBF
- Part No.:
- LT3467AIDDB#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LT3467AIDDB#TRPBF.pdf
- Description:
- IC REG BST FLYBACK ADJ 1.1A 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,161
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Product details
Overview
LT3467AIDDB#TRPBF from Analog Devices is a 2.1MHz, 42V, 1.1A monolithic step-up DC/DC converter with integrated soft-start, designed for high-efficiency boost, SEPIC, and flyback topologies in space-constrained applications. It delivers 5V at 430mA from a 3.3V input or 15V at 135mA from the same supply, featuring a low 330mV VCE(SAT) bipolar switch and 1.255V feedback reference.
For engineers reviewing the LT3467AIDDB#TRPBF datasheet, LT3467AIDDB#TRPBF pinout, LT3467AIDDB#TRPBF application, or LT3467AIDDB#TRPBF equivalent, key selection criteria include switching frequency (2.1MHz), maximum output voltage (40V), input voltage range (2.4V–16V), soft-start programmability, and DFN-8 package thermal performance for industrial and automotive power rails.
Technical Context
The LT3467AIDDB#TRPBF employs constant-frequency current-mode PWM control with an internal 2.1MHz oscillator, enabling stable regulation and predictable noise spectra. Its dedicated soft-start pin (SS) sources 4µA to charge an external capacitor, controlling output voltage ramp rate and limiting inrush current during startup.
It integrates a 42V-rated NPN bipolar switch with 330mV typical VCE(SAT) at 1.1A, supporting high-voltage boost up to 40V and SEPIC/flyback configurations. The 1.255V feedback reference and ±50nA FB bias current ensure precise output regulation across temperature and load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 2.1MHz - enables use of sub-1µH inductors and compact ceramic capacitors for ultra-small PCB footprints. |
| Input Voltage Range | 2.4V to 16V - supports single Li-ion (2.6–4.2V), multi-cell alkaline/nickel, and fixed 3.3V/5V rails without pre-regulation. |
| Max Output Voltage | 40V - allows direct generation of TFT-LCD bias, xDSL, and industrial sensor supply rails without cascaded stages. |
| Switch Current Limit | 1.4A typical - provides robust overcurrent protection while sustaining >430mA output at 5V from 3.3V input in boost mode. |
| Feedback Reference | 1.255V ±1.2% - sets output accuracy via external resistor divider; low 50nA bias current minimizes divider error. |
| Soft-Start Current | 4µA - linearly charges external SS capacitor to control output rise time and prevent input rail sag or diode stress. |
| Shutdown Current | <1µA - ensures battery-powered systems maintain long shelf life and low quiescent drain in standby. |
Pinout & Package
LT3467AIDDB#TRPBF uses an 8-lead (3mm × 2mm) plastic DFN package with exposed pad (Pin 9), rated for –40°C to +125°C operation. The exposed pad must be soldered to PCB ground for thermal and electrical integrity (θJA = 80°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FB (Pin 1) | Feedback input | Connects to resistive divider tap; regulates output by comparing against 1.255V internal reference. |
| GND (Pins 2, 5, 9) | Ground reference | Pins 2 and 5 are signal GND; Pin 9 is exposed thermal pad-must be soldered to PCB ground plane. |
| SW (Pins 3, 4) | Switch collector node | Drives external inductor/diode; high dv/dt node requiring minimal trace area to reduce EMI. |
| VIN (Pin 6) | Input supply | Accepts 2.4V–16V; requires local 1–4.7µF ceramic bypass capacitor placed adjacent to pin. |
| SS (Pin 7) | Soft-start control | Sources 4µA to external capacitor; controls output voltage ramp rate and peak switch current at startup. |
| SHDN (Pin 8) | Enable/disable control | Logic-high ≥2.4V enables regulator; logic-low ≤0.5V places device in <1µA shutdown state. |
Key Features
| Feature | Design Value |
|---|---|
| 2.1MHz fixed-frequency operation | Reduces inductor size to ≤1µH and enables use of low-profile 0402/0603 MLCCs for total solution height <1.2mm. |
| Programmable soft-start | External capacitor sets controlled output voltage ramp, eliminating input surge current and preventing switch overstress in high-VOUT designs. |
| 42V, 1.1A bipolar switch | Low 330mV VCE(SAT) at full current enables high efficiency (>85%) even at 15V/135mA output from 3.3V input. |
| Wide input range (2.4V–16V) | Supports direct regulation from single Li-ion, 4-cell alkaline, or standard 3.3V/5V system rails without LDO pre-biasing. |
| AEC-Q100 qualified (I-grade) | Rated for –40°C to +125°C junction temperature, meeting automotive reliability requirements for infotainment and ADAS power supplies. |
Applications
| Digital Camera Power Supply | White LED Backlight Driver |
|---|---|
Use Scenario: Generating 15V bias for CCD/CMOS image sensors and 5V logic rails from a single 3.3V system supply in compact camera modules. IC Role / Device Role / Timing Role: Primary boost controller managing dynamic load steps during sensor readout and flash charging. Use Value: 2.1MHz switching enables <1µH inductors and eliminates audible coil whine, critical for silent operation. |
Use Scenario: Driving parallel strings of white LEDs requiring 18–24V at ~10–20mA per string in smartphone and tablet displays. IC Role / Device Role / Timing Role: Constant-voltage boost source with tight output regulation (±1.2% ref) for uniform LED brightness. Use Value: 42V max output supports multi-string configurations; soft-start prevents LED current overshoot during power-on. |
| TFT-LCD Bias Generator | xDSL Line Power Supply |
Use Scenario: Producing triple outputs (+9V, –9V, +18V) for TFT panel gate drivers and source drivers from a 3.3V input in portable displays. IC Role / Device Role / Timing Role: Core SEPIC/flyback controller in multi-output bias supply with independent soft-start sequencing. Use Value: High 42V switch rating enables efficient generation of >15V rails; DFN-8 package fits tight display bezel constraints. |
Use Scenario: Providing isolated 40V/20mA auxiliary power for DSL line driver ICs in residential gateways and modems operating from 5V USB or wall adapters. IC Role / Device Role / Timing Role: High-voltage boost stage delivering regulated 40V output with low ripple for analog front-end stability. Use Value: 40V max output meets ADSL2+/VDSL2 line driver requirements; 2.1MHz operation reduces EMI filtering complexity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3467EDDB#TRPBF | 1.3MHz switching frequency; E-grade (–40°C to 85°C); identical pinout and topology support. | Lower frequency requires larger inductors (≥4.7µH); suitable for cost-sensitive non-automotive designs with relaxed size constraints. | Select when board space is less critical and 1.3MHz EMI profile better suits system-level filtering. |
| LT3467AIS6#TRPBF | TSOT-23-6 package (6-pin); same 2.1MHz frequency and I-grade temp range; no dedicated SS pin (soft-start disabled). | Lacks programmable soft-start; limited to simpler boost applications where inrush control is not required. | Choose for minimal footprint where soft-start is unnecessary and thermal dissipation is managed via layout. |
Compared with LT3467EDDB#TRPBF, the LT3467AIDDB#TRPBF offers higher frequency for smaller passives and extended temperature range; versus LT3467AIS6#TRPBF, it adds soft-start control and superior thermal performance via the DFN-8 exposed pad.
Availability
LT3467AIDDB#TRPBF is available at Aetrix Electronics and suitable for industrial power supplies, automotive infotainment systems, and portable medical devices requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT3467AIDDB#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, industrial automation, communications, and automotive markets.
The LT3467/LT3467A product line was engineered for high-efficiency, high-voltage DC/DC conversion in space- and thermally-constrained applications-including battery-powered imaging, display, and telecom equipment-where small inductors and fast transient response are essential.
FAQ
What is the maximum output voltage achievable with the LT3467AIDDB#TRPBF?
The LT3467AIDDB#TRPBF supports up to 40V output in boost configuration, enabled by its 42V-rated internal bipolar switch. This allows direct generation of high-voltage rails for TFT-LCD bias, xDSL line drivers, and industrial sensors without cascading converters. Operation beyond 40V risks exceeding absolute maximum ratings and is not supported.
Does the LT3467AIDDB#TRPBF require an external soft-start capacitor?
Yes-the LT3467AIDDB#TRPBF features a dedicated SS pin that sources 4µA to charge an external capacitor, controlling output voltage ramp rate. Omitting the capacitor disables soft-start, risking high inrush current, input rail sag, and potential switch overstress during startup-especially in high-VOUT applications. Typical values range from 10nF to 200nF.
Can the LT3467AIDDB#TRPBF be used in SEPIC or flyback topologies?
Yes-the LT3467AIDDB#TRPBF's 42V switch rating and current-mode architecture support SEPIC and flyback configurations. Application circuits in the datasheet demonstrate 5V output from 4-cell alkaline (4–6.5V) using SEPIC, and dual ±15V outputs using flyback-derived winding. External diode and transformer selection must respect the 42V VSW rating.
What is the thermal performance difference between the DFN-8 and TSOT-23 packages for the LT3467A?
The LT3467AIDDB#TRPBF in DFN-8 (3mm × 2mm) achieves θJA = 80°C/W due to its exposed thermal pad, which must be soldered to PCB ground. In contrast, the TSOT-23 variant (e.g., LT3467AIS6#TRPBF) has θJA = 165°C/W. For 1.1A switch current and 125°C max junction temperature, the DFN-8 enables ~2× higher continuous power dissipation under identical PCB conditions.
Is the LT3467AIDDB#TRPBF AEC-Q100 qualified?
Yes-the "I" grade in LT3467AIDDB#TRPBF denotes qualification to AEC-Q100 Grade 1 (–40°C to +125°C junction temperature) for automotive applications. It undergoes rigorous stress testing including HTOL, TC, and ESD per AEC standards, making it suitable for infotainment, ADAS camera power, and body control module auxiliary supplies.
LT3467AIDDB#TRPBF 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#TRPBF FAQ
1.How can I place an order for LT3467AIDDB#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3467AIDDB#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 LT3467AIDDB#TRPBF reliable?
The price and inventory of LT3467AIDDB#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3467AIDDB#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3467AIDDB#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3467AIDDB#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3467AIDDB#TRPBF?
LT3467AIDDB#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3467AIDDB#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 LT3467AIDDB#TRPBF?
For technical support, including LT3467AIDDB#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3467AIDDB#TRPBF requirements.
6.How does Aetrix verify that LT3467AIDDB#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3467AIDDB#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 LT3467AIDDB#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3467AIDDB#TRPBF?
All LT3467AIDDB#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3467AIDDB#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 LT3467AIDDB#TRPBF part is unused and in its original packaging.
Return procedure for LT3467AIDDB#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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