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Analog Devices Inc. LT3467EDDB
- Part No.:
- LT3467EDDB
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LT3467EDDB.pdf
- Description:
- IC REG BST FLYBACK ADJ 1.1A 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,487
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Product details
Overview
LT3467EDDB from Analog Devices is a 1.3MHz, 42V, 1.1A monolithic step-up DC/DC converter with integrated soft-start, housed in an 8-lead (3mm × 2mm) DFN package. It delivers 5V at 540mA from a 3.3V input or 12V at 270mA from a 5V input in boost topology, and supports SEPIC/flyback configurations up to 40V output. Its low 330mV VCE(SAT) bipolar switch enables high-efficiency power conversion in space-constrained portable electronics.
For engineers reviewing the LT3467EDDB datasheet, LT3467EDDB pinout, LT3467EDDB application, or LT3467EDDB equivalent, this page provides verified technical context, exact pin functions, real-world application constraints (e.g., 94% max duty cycle, 1.255V feedback reference), and validated alternatives for boost, SEPIC, and TFT-LCD bias supply designs requiring stable 2.4V–16V input operation and ≤85°C junction temperature.
Technical Context
The LT3467EDDB implements constant-frequency current-mode PWM control with a 1.3MHz oscillator, enabling predictable noise filtering and use of sub-5µH inductors. Its internal NPN switch features 42V breakdown rating and 330mV saturation voltage at 1.1A, supporting high-voltage boost and flyback topologies without external high-side drivers.
Soft-start is implemented via a dedicated SS pin with 4µA internal charging current to 1.255V reference, limiting inrush current and preventing switch overstress during startup. The device uses a 1.255V precision feedback reference and operates across –40°C to +85°C junction temperature range with <1µA shutdown current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 1.3MHz - Enables use of 2.7µH inductors and compact ceramic capacitors; reduces EMI filter size vs lower-frequency converters. |
| Max Output Voltage | 40V - Supports boost converters for LCD bias, xDSL, and industrial 24V rail generation without external HV components. | Input Voltage Range | 2.4V to 16V - Covers single Li-ion (2.6–4.2V), 4-cell alkaline (4–6.5V), and 5V/12V system rails directly. |
| Feedback Reference | 1.255V ±1.2% - Sets output voltage via R1/R2 divider; enables precise 5V, 6V, 12V, 15V, or 40V outputs with <±2% tolerance. |
| Switch VCE(SAT) | 330mV at 1.1A - Minimizes conduction loss in high-current boost stages; improves efficiency by ~3% vs 500mV alternatives. |
| Shutdown Current | <1µA - Enables battery-powered systems to achieve multi-year shelf life; critical for medical diagnostics and remote sensors. |
| Max Duty Cycle | 94% - Allows high step-up ratios (e.g., 3.3V→40V) in continuous conduction mode; avoids discontinuous mode instability. |
Pinout & Package
LT3467EDDB is packaged in an 8-lead (3mm × 2mm) plastic DFN with exposed thermal pad (Pin 9, GND). The package height is 0.75mm, suitable for ultra-thin portable devices. Pin 1 is marked by a bar on the top surface; the exposed pad must be soldered to PCB ground for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FB (Pin 1) | Feedback Input | Connects to resistor divider tap; regulates output by comparing against 1.255V internal reference; trace area must be minimized to reduce noise coupling. |
| GND (Pins 2, 5, 9) | Ground Return | Pins 2 and 5 are signal GND; Pin 9 is exposed thermal pad-must be soldered to large PCB ground plane for θJA = 80°C/W thermal performance. |
| SW (Pins 3, 4) | Switch Collector | Connects to inductor/diode node; carries full switching current and high dv/dt; requires minimal trace area and tight layout to suppress EMI. |
| VIN (Pin 6) | Input Supply | Accepts 2.4V–16V; must be locally bypassed with ≥1µF ceramic capacitor placed adjacent to pin to stabilize input impedance. |
| SS (Pin 7) | Soft-Start Control | Charged by 4µA internal current to 1.255V; 47nF capacitor yields ~13ms startup time; floating disables soft-start. |
| SHDN (Pin 8) | Shutdown Enable | Drives internal circuitry when ≥2.4V; pulls to GND to disable regulator and reduce quiescent current to <1µA. |
Key Features
| Feature | Design Value |
|---|---|
| 1.3MHz fixed-frequency operation | Enables use of 2.7µH inductors and 4.7µF–15µF X5R/X7R ceramic output capacitors, reducing board area by >40% vs 500kHz converters. |
| Integrated soft-start with programmable ramp | 4µA current source charges external capacitor to 1.255V, limiting peak inductor current during startup and preventing diode/switch overstress. |
| 42V, 1.1A bipolar switch with 330mV VCE(SAT) | Eliminates need for external high-voltage MOSFETs in 40V boost designs; achieves >85% efficiency at 540mA output from 3.3V input. |
| Dedicated SHDN pin with <1µA shutdown current | Supports battery-backed applications requiring multi-year standby; no external pull-up needed-internal bias ensures clean enable/disable transition. |
| Pin-compatible with LT1930 and LT1613 | Allows drop-in replacement in existing designs using those regulators; same DFN footprint and pin mapping simplifies redesign and qualification. |
Applications
| Lithium-Ion to 5V Boost Converter | TFT-LCD Bias Supply |
|---|---|
Use Scenario: Powering USB peripherals or logic rails from single-cell Li-ion batteries (2.6V–4.2V). IC Role / Device Role / Timing Role: Step-up DC/DC controller generating regulated 5V output with programmable soft-start to prevent inrush into downstream capacitance. Use Value: Delivers 540mA at 3.3V input with >88% efficiency; 1.3MHz switching allows 2.7µH inductor and 15µF ceramic output cap in <10mm² area. |
Use Scenario: Generating dual-polarity (±9V, +18V) bias voltages for TFT-LCD panel gate drivers and source drivers. IC Role / Device Role / Timing Role: Primary boost controller in triple-output flyback-derived topology, regulating 9V/18V/–9V rails with independent soft-start sequencing. Use Value: 42V switch rating supports 18V output directly; 1.255V feedback reference enables precise rail matching within ±1.5% across temperature. |
| SEPIC Converter for 4-Cell Alkaline Input | xDSL Line Power Supply |
Use Scenario: Providing isolated 5V output from variable 4-cell alkaline battery input (4V–6.5V) in portable test equipment. IC Role / Device Role / Timing Role: SEPIC controller maintaining regulation during battery discharge; uses coupled inductors to avoid magnetic saturation issues. Use Value: Achieves 450mA output at 6.5V input with 92% efficiency; 94% max duty cycle accommodates full input range without mode transition. |
Use Scenario: Generating 40V bias for DSL line driver amplifiers in residential gateway modems. IC Role / Device Role / Timing Role: High-voltage boost controller driving transformer-coupled output stage; handles wide input transients per GR-909 compliance. Use Value: 42V switch rating exceeds 40V requirement with 2V margin; low 330mV VCE(SAT) minimizes thermal stress under sustained 20mA load. |
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 |
|---|---|---|---|
| LT3467AEDDB | 2.1MHz switching frequency vs 1.3MHz; 82% max duty cycle; 430mA 5V output from 3.3V input (vs 540mA). | Better suited for ultra-compact designs requiring smallest possible inductors (e.g., 0.9µH); reduced output current capability limits high-power applications. | Select LT3467AEDDB only when board area is constrained and output current ≤430mA suffices; not a direct replacement due to duty cycle and current limit differences. |
| LT1930EDDB | No soft-start pin; 1.2MHz switching; 30V switch rating (vs 42V); 600mA switch current (vs 1.1A). | Cannot support 40V boost or SEPIC topologies requiring >30V; lacks programmable startup control for sensitive loads. | Choose LT1930EDDB only for legacy designs where soft-start is unnecessary and output voltage ≤30V; verify thermal performance at 1.1A load. |
Compared with LT3467AEDDB, the LT3467EDDB offers higher output current and wider duty cycle for demanding boost/SEPIC applications, while LT1930EDDB trades off voltage headroom and soft-start for pin compatibility in cost-sensitive, lower-voltage designs.
Availability
LT3467EDDB is available at Aetrix Electronics and suitable for lithium-ion power banks, TFT-LCD bias supplies, and xDSL line cards requiring stable component supply with guaranteed long-term availability and full traceability.
Supply support for LT3467EDDB 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, automotive, communications, and healthcare markets since 1965.
The LT3467EDDB belongs to Analog Devices' Power by Linear™ family of monolithic DC/DC converters, designed specifically for compact, high-efficiency boost, SEPIC, and flyback power supplies in portable and space-constrained systems.
FAQ
What is the maximum output voltage achievable with the LT3467EDDB?
The LT3467EDDB supports up to 40V output in boost configuration, limited by its 42V-rated internal NPN switch. This enables direct generation of TFT-LCD bias rails (e.g., 18V, 23V) and xDSL line voltages without external HV components. Operation above 40V risks switch breakdown and is not supported.
Can the LT3467EDDB be used in SEPIC topology, and what are the key design considerations?
Yes, the LT3467EDDB is explicitly qualified for SEPIC operation, as shown in Typical Application TA03. Key considerations include using coupled inductors to minimize size, selecting Schottky diodes rated ≥40V (e.g., MBRM140), and ensuring the feedback divider accounts for the SEPIC's non-inverting transfer function. The 94% max duty cycle supports wide input ranges like 4–6.5V from alkaline cells.
How does the soft-start function of the LT3467EDDB improve system reliability?
The LT3467EDDB's soft-start pin (SS) sources a precise 4µA current to charge an external capacitor to 1.255V, controlling the rate of output voltage rise and limiting inrush current. This prevents overstress on the internal switch and external diode during startup-especially critical in high-voltage applications (e.g., 40V boost) where simultaneous high voltage and current could cause failure.
What is the recommended inductor value for a 3.3V-to-5V boost application using the LT3467EDDB?
For 3.3V-to-5V boost, Analog Devices specifies a 2.7µH inductor (e.g., Sumida CR43-2R7) in Figure 2 and TA01a. This value balances ripple current (<30% of IOUT), core loss, and physical size. Inductors must handle ≥1.2A saturation current and feature low DCR; ferrite cores optimized for 1.3MHz operation (e.g., TDK, Murata) are preferred.
Is the LT3467EDDB pin-compatible with other regulators in the same family, and which ones?
Yes, the LT3467EDDB is pin-for-pin compatible with the LT1930 and LT1613 in the same DFN-8 package, as confirmed in the Features section. This allows direct substitution in existing layouts. However, it is not compatible with LT3467A variants due to differing oscillator frequencies and current limits, despite identical pinout.
LT3467EDDB 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:
- 1.3MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (3x2)
LT3467EDDB FAQ
1.How can I place an order for LT3467EDDB through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3467EDDB 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 LT3467EDDB reliable?
The price and inventory of LT3467EDDB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3467EDDB is usually 5 days.
3.What payment methods are accepted for LT3467EDDB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3467EDDB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3467EDDB?
LT3467EDDB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3467EDDB 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 LT3467EDDB?
For technical support, including LT3467EDDB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3467EDDB requirements.
6.How does Aetrix verify that LT3467EDDB is sourced from the original manufacturer or authorized distributors?
All LT3467EDDB 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 LT3467EDDB meets industry standards.
7.What is the process for return or replacement of LT3467EDDB?
All LT3467EDDB units undergo pre-shipment inspection (PSI). If there is an issue with LT3467EDDB, 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 LT3467EDDB part is unused and in its original packaging.
Return procedure for LT3467EDDB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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