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Analog Devices Inc. LT3467AEDDB
- Part No.:
- LT3467AEDDB
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LT3467AEDDB.pdf
- Description:
- IC REG BST FLYBACK ADJ 1.1A 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,101
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Product details
Overview
LT3467AEDDB 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. 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 bias supplies.
For engineers reviewing the LT3467AEDDB datasheet, LT3467AEDDB pinout, LT3467AEDDB application, or LT3467AEDDB equivalent, key selection criteria include its 2.1MHz switching frequency for ultra-small magnetics, 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 employs constant-frequency current-mode PWM control with a dedicated soft-start pin (SS) that sources 4µA to charge an external capacitor, enabling controlled output voltage ramp-up and inrush current limiting. Its internal 42V NPN bipolar switch features low saturation voltage and supports high-voltage boost topologies up to 40V output.
It integrates a 1.255V precision bandgap reference, error amplifier, oscillator, and PWM comparator. The 2.1MHz fixed switching frequency reduces required inductor size (e.g., 0.9µH–6.8µH), while the 88% maximum duty cycle and 10% minimum duty cycle define practical operating boundaries for continuous conduction mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 2.1MHz - enables use of sub-1µH inductors and <10µF ceramic output capacitors, minimizing 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 regulated 3.3V/5V rails. |
| Output Voltage Capability | Up to 40V - suitable for high-side boost, SEPIC, and flyback configurations powering TFT-LCD bias or xDSL supplies. |
| Feedback Reference Voltage | 1.255V ±1.5% - sets output via external resistor divider; enables precise 5V, 12V, 15V, or custom outputs. |
| Soft-Start Charging Current | 4µA - linearly charges external SS capacitor to 1.255V, allowing predictable start-up time (e.g., 47nF → ~15ms). |
| Shutdown Quiescent Current | <1µA - ensures minimal battery drain in portable devices during sleep or off-state. |
| Switch VCE(SAT) | 330mV at 1.1A - minimizes conduction loss and thermal rise in high-current boost stages. |
Pinout & Package
LT3467AEDDB uses an 8-lead (3mm × 2mm) plastic DFN package with exposed pad (Pin 9) soldered to PCB ground for thermal and electrical integrity. Pin 1 marked by bar; package thickness 0.75mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (FB) | Feedback Input | Connects to resistive divider tap; regulates output via 1.255V reference; trace must be short and shielded to minimize noise coupling. |
| Pins 2 & 5 (GND) | Ground Return | Power and signal ground nodes; must connect directly to local ground plane; exposed pad (Pin 9) is GND and requires soldering. |
| Pins 3 & 4 (SW) | Switch Collector | Drives external inductor/diode; high di/dt node-requires minimized trace area and tight loop layout to reduce EMI. |
| Pin 6 (VIN) | Input Supply | Accepts 2.4–16V; must be locally bypassed with ≥1µF ceramic capacitor placed adjacent to pin. |
| Pin 7 (SS) | Soft-Start Control | Sources 4µA to external capacitor; voltage ramp controls peak switch current during startup; floating disables soft-start. |
| Pin 8 (SHDN) | Enable/Shutdown | Logic-level input: ≥2.4V enables regulator; ≤0.5V shuts down device and reduces IQ to <1µA. |
Key Features
| Feature | Design Value |
|---|---|
| 2.1MHz fixed-frequency operation | Reduces inductor size by >50% vs 1.3MHz LT3467; enables compact 0.9µH–6.8µH magnetics and low-profile layouts. |
| Programmable soft-start | External capacitor sets startup time and limits inrush current-critical for protecting input sources and preventing switch overstress. |
| 42V, 1.1A integrated NPN switch | Eliminates external transistor; supports 40V output in boost and SEPIC; low 330mV VCE(SAT) improves efficiency at full load. |
| 1.255V precision feedback reference | Enables accurate output regulation across temperature (±1.5% over –40°C to 85°C); simplifies resistor-divider design. |
| Low shutdown current (<1µA) | Extends battery life in always-on or intermittently powered systems such as medical sensors and handheld instruments. |
Applications
| Digital Camera Power Supply | White LED Backlight Driver |
|---|---|
Use Scenario: Generating 15V at 135mA from a 3.3V Li-ion rail to drive white LEDs in compact camera modules. IC Role / Device Role / Timing Role: Step-up DC/DC controller providing regulated high-voltage bias with fast transient response. Use Value: 2.1MHz operation allows tiny 6.8µH inductor and 2.2µF ceramic capacitor, reducing solution size by 40% vs lower-frequency alternatives. |
Use Scenario: Delivering 5V at 430mA from 3.3V to power LED strings in smartphone displays. IC Role / Device Role / Timing Role: High-efficiency boost converter with soft-start to prevent LED flash during power-on. Use Value: Programmable soft-start eliminates inrush-induced brightness flicker; 330mV VCE(SAT) maintains >85% efficiency at full load. |
| TFT-LCD Bias Supply | xDSL Line Card Power |
Use Scenario: Generating ±9V and +18V from 3.3V for TFT-LCD panel gate/source drivers in industrial HMIs. IC Role / Device Role / Timing Role: Core boost controller in triple-output flyback-derived topology with output disconnect capability. Use Value: 42V switch rating supports stacked outputs; 88% max duty cycle enables stable multi-rail generation without discontinuous mode penalties. |
Use Scenario: Providing isolated 40V at 20mA from 5V input for DSL line driver ICs in broadband access equipment. IC Role / Device Role / Timing Role: Primary-side boost stage feeding secondary-side isolation transformer. Use Value: 40V output capability and 2.1MHz switching enable small, low-profile magnetics meeting EMI Class B requirements. |
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 | 1.3MHz switching frequency; identical pinout, package, and feature set except oscillator frequency and current limit curve. | Requires larger inductors (e.g., 4.7µH vs 0.9µH) and higher output capacitance for equivalent ripple performance. | Select LT3467EDDB when board space permits larger passives or when lower EMI susceptibility favors lower fundamental frequency. |
| LT3467AES6 | Same 2.1MHz frequency but in 6-lead TSOT-23 package; lower thermal resistance (θJA = 165°C/W vs 80°C/W) and reduced current capability (1.1A peak, lower duty cycle). | Limited to lower-power applications (<300mA at 5V) due to smaller package thermal mass and no exposed pad. | Choose LT3467AES6 only for ultra-low-profile designs where 3mm × 2mm DFN is unavailable and power dissipation remains below 0.5W. |
Compared with LT3467EDDB and LT3467AES6, the LT3467AEDDB uniquely balances high-frequency operation, thermal performance via exposed-pad DFN, and full 1.1A switch capability-making it optimal for 430mA+ 5V boost or 135mA+ 15V applications where size and efficiency are co-prioritized.
Availability
LT3467AEDDB is available at Aetrix Electronics and suitable for digital camera power supplies, white LED backlight drivers, TFT-LCD bias generation, and xDSL line card power requiring stable component supply, long-term lifecycle support, and AEC-Q100-aligned reliability.
Supply support for LT3467AEDDB 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 was designed specifically for compact, high-efficiency boost, SEPIC, and flyback converters in portable and space-constrained applications-emphasizing integration, thermal robustness, and ease of layout.
FAQ
What is the maximum output voltage supported by the LT3467AEDDB?
The LT3467AEDDB supports output voltages up to 40V, enabled by its internal 42V-rated NPN switch. This makes it suitable for high-voltage boost, SEPIC, and flyback topologies-such as generating ±9V/+18V for TFT-LCD bias or 40V for xDSL line drivers-provided external components (diode, inductor, capacitor) are rated accordingly. The 42V absolute maximum switch voltage provides 2V margin for transients.
How does the soft-start function work on the LT3467AEDDB?
The LT3467AEDDB's soft-start pin (SS) sources a precise 4µA current to charge an external capacitor to 1.255V. As the capacitor voltage ramps, it controls the error amplifier's reference, limiting peak switch current during startup. A 47nF capacitor yields ~15ms ramp time. Leaving SS floating disables soft-start. This prevents inrush current, protects the switch from overstress at high VSW, and eliminates output voltage overshoot.
Can the LT3467AEDDB replace the LT3467EDDB in an existing design?
Yes-the LT3467AEDDB is pin-for-pin compatible with the LT3467EDDB in the same DFN package. However, its 2.1MHz switching frequency requires re-optimization of inductor value (e.g., 0.9µH–6.8µH instead of 4.7µH–10µH) and may affect compensation. Output capacitor ESR requirements also tighten. Layout changes are not needed, but passive component values and stability analysis must be verified per the LT3467AEDDB's higher frequency characteristics.
What is the operating temperature range for the LT3467AEDDB?
The LT3467AEDDB is specified for an operating junction temperature range of –40°C to 85°C (E-grade). This is confirmed by its ordering part number suffix "E" and the "–40°C to 85°C" temperature range listed in the official Analog Devices order information table. The device's thermal performance is enhanced by the exposed pad (Pin 9), which must be soldered to the PCB ground plane to achieve θJA = 80°C/W.
Which external components are critical for stable operation of the LT3467AEDDB?
Critical external components for stable LT3467AEDDB operation include: (1) a low-ESR ceramic output capacitor (e.g., 10µF–22µF X5R/X7R, 6.3V+ rating); (2) a Schottky diode rated ≥40V (e.g., MBRM140) for 40V outputs; (3) an inductor with ≥1.2A saturation current and low DCR (e.g., 0.9µH–6.8µH ferrite core); and (4) a soft-start capacitor (10nF–200nF) for controlled startup. Input bypass (≥1µF ceramic) and feedback resistors must also meet layout and tolerance requirements.
LT3467AEDDB 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 ~ 85°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (3x2)
LT3467AEDDB FAQ
1.How can I place an order for LT3467AEDDB through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3467AEDDB 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 reliable?
The price and inventory of LT3467AEDDB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3467AEDDB is usually 5 days.
3.What payment methods are accepted for LT3467AEDDB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3467AEDDB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3467AEDDB?
LT3467AEDDB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3467AEDDB 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?
For technical support, including LT3467AEDDB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3467AEDDB requirements.
6.How does Aetrix verify that LT3467AEDDB is sourced from the original manufacturer or authorized distributors?
All LT3467AEDDB 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 meets industry standards.
7.What is the process for return or replacement of LT3467AEDDB?
All LT3467AEDDB units undergo pre-shipment inspection (PSI). If there is an issue with LT3467AEDDB, 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 part is unused and in its original packaging.
Return procedure for LT3467AEDDB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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