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Analog Devices Inc. LT3467AEDDB#TRPBF
- Part No.:
- LT3467AEDDB#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LT3467AEDDB#TRPBF.pdf
- Description:
- IC REG BST FLYBACK ADJ 1.1A 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,153
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Product details
Overview
LT3467AEDDB#TRPBF 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 5V at 430mA from a 3.3V input or 15V at 135mA from the same supply, targeting space-constrained boost, SEPIC, and flyback applications in portable electronics and TFT-LCD bias supplies.
For engineers reviewing the LT3467AEDDB#TRPBF datasheet, LT3467AEDDB#TRPBF pinout, LT3467AEDDB#TRPBF application, or LT3467AEDDB#TRPBF equivalent, key selection criteria include its 2.1MHz switching frequency for ultra-small passive sizing, 1.255V feedback reference, programmable soft-start via external capacitor, 330mV VCE(SAT) at 1.1A, and −40°C to 85°C operating junction temperature range.
Technical Context
The LT3467AEDDB#TRPBF employs constant-frequency current-mode PWM control with a 2.1MHz oscillator, enabling stable regulation and predictable noise filtering. Its internal NPN power switch features low 330mV saturation voltage at 1.1A, supporting high-efficiency operation across wide duty cycles up to 82%.
Soft-start is implemented via a dedicated SS pin sourcing 4µA to charge an external capacitor to 1.255V, limiting inrush current and preventing switch overstress during startup. The FB pin regulates output using a precise 1.255V reference, with feedback divider design governed by VOUT = 1.255V(1 + R1/R2).
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. |
| 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. |
| Output Voltage Range | Up to 40V - suitable for 5V, 6V, 12V, 15V, 18V, 23V, and 40V boost/SEPIC/flyback outputs. |
| Switch Current Limit | 1.4A typical - protects internal NPN switch and external components under overload or short-circuit. |
| Feedback Reference Voltage | 1.255V ±2.5% - sets output accuracy and stability; used with external resistor divider for precise VOUT. |
| Soft-Start Charging Current | 4µA - linearly ramps FB loop reference to limit peak inductor current and input surge at startup. |
| Shutdown Quiescent Current | <1µA - minimizes battery drain in always-on or low-power standby systems. |
| Max Switch Voltage Rating | 42V - supports designs requiring ≥40V output with margin for transients and diode drop. |
Pinout & Package
LT3467AEDDB#TRPBF uses 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; regulates output via 1.255V reference; trace area must be minimized to reduce noise coupling. |
| GND (Pins 2, 5, 9) | Ground reference | 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. |
| SW (Pins 3, 4) | Switch collector node | Connects to inductor cathode and Schottky diode anode; high di/dt node-requires minimal trace area and tight layout to suppress EMI. |
| VIN (Pin 6) | Input supply | Accepts 2.4–16V; requires local 1–4.7µF ceramic bypass capacitor placed adjacent to pin. |
| SS (Pin 7) | Soft-start control | Sources 4µA to external capacitor; time constant determines output ramp rate; floating disables soft-start. |
| SHDN (Pin 8) | Enable/disable control | Logic-high ≥2.4V enables regulator; ≤0.5V shuts down device, reducing IQ to <1µA. |
Key Features
| Feature | Design Value |
|---|---|
| 2.1MHz fixed-frequency operation | Enables use of 0.9–6.8µH inductors and small X5R/X7R ceramic capacitors, reducing solution footprint by >40% vs 1.3MHz LT3467. |
| Low VCE(SAT) bipolar switch | 330mV at 1.1A reduces conduction loss and improves efficiency in high-current boost stages (e.g., 5V@430mA from 3.3V). |
| Dedicated soft-start pin (SS) | 4µA current source charges external capacitor to 1.255V, eliminating input surge and preventing switch overstress during startup. |
| 42V switch rating | Supports reliable 40V output generation in boost, SEPIC, and flyback topologies with margin for diode VF and transient spikes. |
| Pin-compatible upgrade path | Direct replacement for LT1930 and LT1613; shares footprint and functionality with LT3467 but offers higher 2.1MHz frequency. |
| −40°C to 85°C junction range | Qualified for industrial and consumer applications; validated performance across full temperature range per Electrical Characteristics table. |
Applications
| Portable Medical Sensors | TFT-LCD Bias Supplies |
|---|---|
|
Use Scenario: Powering analog front-end circuitry and precision ADCs in handheld diagnostic devices powered by single Li-ion cells. IC Role / Device Role / Timing Role: Step-up converter generating stable 5V or ±15V rails from 2.6–4.2V battery input. Use Value: 2.1MHz operation allows ultra-compact 0.9µH inductor and 22µF ceramic output cap, meeting stringent size and EMI requirements. |
Use Scenario: Generating triple outputs (e.g., +9V, −9V, +18V) for LCD panel gate drivers and source drivers. IC Role / Device Role / Timing Role: Primary boost controller in multi-output flyback or charge-pump-assisted topology. Use Value: 42V switch rating and programmable soft-start ensure robust startup into capacitive loads without voltage droop or overshoot. |
| Cellular Phone Power Management | xDSL Line Card Supplies |
|
Use Scenario: Providing 5V rail for USB OTG, camera modules, or RF power amplifiers from 3.3V system bus. IC Role / Device Role / Timing Role: High-efficiency boost converter delivering up to 430mA at 5V with fast transient response. Use Value: 330mV VCE(SAT) and 2.1MHz switching minimize thermal rise and enable <1mm profile solutions in thin form factors. |
Use Scenario: Generating isolated 40V bias for DSL line drivers in residential gateway equipment. IC Role / Device Role / Timing Role: Primary-side boost controller in non-isolated or transformer-coupled flyback configuration. Use Value: Guaranteed 42V switch rating and 82% max duty cycle support reliable 40V output even under worst-case input and load conditions. |
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#TRPBF | 1.3MHz switching frequency; identical pinout, package, and 42V/1.1A switch specs. | Requires larger inductors (e.g., 4.7µH) and higher-value output caps; lower efficiency at light loads due to fixed frequency. | Select when board layout already accommodates 1.3MHz magnetics or when lower EMI sensitivity permits slower switching. |
| LT1930ES6#TRPBF | 6-lead TSOT-23 package; 1.2MHz frequency; 40V/600mA switch; no dedicated SS pin. | Limited to ≤600mA output; lacks programmable soft-start; smaller footprint but lower current capability and thermal performance. | Choose for ultra-low-cost, low-current (<400mA) applications where DFN thermal advantage is not required. |
Compared with LT3467EDDB#TRPBF and LT1930ES6#TRPBF, the LT3467AEDDB#TRPBF delivers higher output current in the same DFN package via 2.1MHz operation and retains soft-start control-enabling smaller passives, faster transient response, and improved reliability in high-voltage boost designs.
Availability
LT3467AEDDB#TRPBF is available at Aetrix Electronics and suitable for portable medical sensors, TFT-LCD bias supplies, cellular phone power management, and xDSL line card supplies requiring stable component supply, long-term lifecycle support, and consistent parametric performance.
Supply support for LT3467AEDDB#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 industrial, automotive, communications, and healthcare markets.
The LT3467/LT3467A product line delivers monolithic boost/SEPIC/flyback regulators with integrated switches and soft-start for space-constrained, high-voltage DC/DC conversion in portable and display power applications.
FAQ
What is the maximum output voltage achievable with the LT3467AEDDB#TRPBF?
The LT3467AEDDB#TRPBF supports output voltages up to 40V, enabled by its 42V-rated internal NPN switch. This rating includes margin for diode forward voltage drop and transient spikes. Applications documented in the datasheet confirm stable 40V generation from a 5V input in boost configuration, with proper selection of Schottky diode (e.g., MBRM140) and output capacitor (≥50V rating).
Does the LT3467AEDDB#TRPBF require an external soft-start capacitor?
The LT3467AEDDB#TRPBF does not require an external soft-start capacitor-it will operate without one-but adding a capacitor (10nF–200nF) to the SS pin is strongly recommended. The internal 4µA current source charges this capacitor to 1.255V, controlling output voltage ramp rate and limiting inrush current. Omitting it risks high peak switch current and potential stress on the internal transistor during startup.
Can the LT3467AEDDB#TRPBF be used in SEPIC topology?
Yes, the LT3467AEDDB#TRPBF is explicitly qualified for SEPIC applications, as confirmed by multiple reference designs in the datasheet-including a 4-cell alkaline to 5V SEPIC converter delivering 450mA. Its 42V switch rating, current-mode control, and 82% maximum duty cycle support stable operation in SEPIC configurations with appropriate inductor coupling and component derating.
What is the thermal performance of the LT3467AEDDB#TRPBF in its DFN package?
The LT3467AEDDB#TRPBF in the 8-lead (3mm × 2mm) DFN package has a thermal resistance of θJA = 80°C/W when the exposed pad (Pin 9) is soldered to a minimum 1cm² PCB ground plane. This enables continuous 430mA output at 5V from 3.3V input with junction temperature remaining below 125°C under typical ambient conditions, provided layout follows recommended guidelines including vias under the pad.
How does the LT3467AEDDB#TRPBF differ from the LT3467EDDB#TRPBF?
The LT3467AEDDB#TRPBF differs from the LT3467EDDB#TRPBF primarily in switching frequency: 2.1MHz vs 1.3MHz. This allows smaller inductors (0.9µH vs 4.7µH) and reduced output capacitance. Both share identical pinout, DFN package, 42V/1.1A switch, soft-start architecture, and −40°C to 85°C temperature grade-making the LT3467AEDDB#TRPBF a direct performance upgrade with no layout changes required.
LT3467AEDDB#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 ~ 85°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (3x2)
LT3467AEDDB#TRPBF FAQ
1.How can I place an order for LT3467AEDDB#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3467AEDDB#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 LT3467AEDDB#TRPBF reliable?
The price and inventory of LT3467AEDDB#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3467AEDDB#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3467AEDDB#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3467AEDDB#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3467AEDDB#TRPBF?
LT3467AEDDB#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3467AEDDB#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 LT3467AEDDB#TRPBF?
For technical support, including LT3467AEDDB#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3467AEDDB#TRPBF requirements.
6.How does Aetrix verify that LT3467AEDDB#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3467AEDDB#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 LT3467AEDDB#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3467AEDDB#TRPBF?
All LT3467AEDDB#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3467AEDDB#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 LT3467AEDDB#TRPBF part is unused and in its original packaging.
Return procedure for LT3467AEDDB#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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