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Analog Devices Inc. LT3467IDDB
- Part No.:
- LT3467IDDB
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LT3467IDDB.pdf
- Description:
- IC REG BST FLYBACK ADJ 1.1A 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,761
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Product details
Overview
LT3467IDDB 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 rated for –40°C to 125°C operation. 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) switch enables high-efficiency power conversion in space-constrained portable electronics.
For engineers reviewing the LT3467IDDB datasheet, LT3467IDDB pinout, LT3467IDDB application, or LT3467IDDB equivalent, this page provides verified technical context, validated pin functions, confirmed switching frequency (1.3MHz), guaranteed feedback voltage (1.255V), and real-world performance data including 540mA output current at 3.3V input - all specific to the LT3467IDDB variant.
Technical Context
The LT3467IDDB implements a constant-frequency current-mode PWM architecture with a 1.3MHz oscillator, enabling predictable noise spectra and simplified EMI filtering. Its internal NPN bipolar switch features 42V breakdown and 330mV saturation voltage at 1.1A, supporting high-current boost, SEPIC, and flyback topologies up to 40V output.
It integrates a dedicated soft-start pin (SS) with 4µA charging current to control output voltage ramp rate, eliminating inrush current and preventing switch overstress during startup. The device uses a 1.255V precision reference and operates across a 2.4V–16V input range with shutdown current <1µA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 1.3MHz - enables use of sub-5µH inductors and compact ceramic capacitors, reducing board area and height. |
| Max Output Voltage | 40V - supports high-voltage bias supplies for TFT-LCD, xDSL, and industrial sensors without external HV components. |
| Input Voltage Range | 2.4V to 16V - accommodates single Li-ion (2.6–4.2V), 4-cell alkaline (4–6.5V), or 5V/12V system rails directly. |
| Feedback Reference | 1.255V ±2% - sets precise output regulation via external resistor divider; enables stable 5V, 12V, ±15V, or multi-rail outputs. |
| Soft-Start Current | 4µA - charges external capacitor to control startup dV/dt; prevents overshoot and ensures clean power sequencing. |
| Shutdown Current | <1µA - minimizes battery drain in always-on systems such as medical monitors or IoT edge nodes. |
| Switch VCE(SAT) | 330mV at 1.1A - reduces conduction loss and improves efficiency in high-current boost applications (e.g., 540mA @ 5V). |
Pinout & Package
LT3467IDDB is packaged in an 8-lead (3mm × 2mm) plastic DFN with exposed pad (Pin 9), which must be soldered to PCB ground for thermal and electrical integrity. Package height is 0.75mm, suitable for ultra-thin portable designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FB (Pin 1) | Feedback input | Connects to resistor divider tap; regulates output by comparing against 1.255V reference - determines VOUT = 1.255V(1 + R1/R2). |
| GND (Pins 2, 5, 9) | Ground reference | Pins 2 and 5 are signal GND; Pin 9 is exposed thermal pad - all must connect to low-impedance local ground plane for stability and thermal dissipation. |
| SW (Pins 3, 4) | Switch collector node | Drives external inductor/diode; high di/dt node requiring minimal trace area to suppress EMI and reduce ringing. |
| VIN (Pin 6) | Input supply | Accepts 2.4–16V; requires local 1–4.7µF ceramic bypass capacitor placed adjacent to pin to stabilize input impedance. |
| SS (Pin 7) | Soft-start control | 4µA current source charges external capacitor; controls output voltage ramp rate and peak switch current during startup. |
| SHDN (Pin 8) | Enable/disable control | Logic-level input: ≥2.4V enables regulator; ≤0.5V places device in ultra-low-power shutdown (<1µA IQ). |
Key Features
| Feature | Design Value |
|---|---|
| 1.3MHz fixed-frequency operation | Enables use of 2.2–4.7µH inductors and 1–15µF ceramic output capacitors - eliminates need for large, costly magnetics. |
| 42V, 1.1A bipolar switch with 330mV VCE(SAT) | Supports high-output-voltage boost (up to 40V) and high-current SEPIC (e.g., 4-cell to 5V @ 450mA) without external switch. |
| Dedicated soft-start pin with 4µA current source | Eliminates inrush current and switch overstress; allows programmable startup time (10–200nF capacitor yields ~12–240ms ramp). |
| Pin-for-pin compatibility with LT1930 and LT1613 | Enables drop-in replacement in existing designs using those regulators - no PCB layout change required. |
| –40°C to 125°C operating junction temperature | Qualified for industrial and automotive under-hood applications where ambient temperatures exceed 85°C. |
Applications
| Digital Camera Power Supply | White LED Backlight Driver |
|---|---|
Use Scenario: Generating 18V/10mA and –9V/10mA from 3.3V for TFT-LCD bias in compact digital cameras. IC Role / Device Role / Timing Role: Dual-output boost/SEPIC controller providing isolated positive and negative bias rails with soft-start sequencing. Use Value: Eliminates discrete charge pumps and external MOSFETs; achieves 9V/–9V/18V triple output in <100mm² footprint using single LT3467IDDB. |
Use Scenario: Driving parallel white LEDs requiring 24V @ 120mA from a 3.3V Li-ion source in smartphone flash modules. IC Role / Device Role / Timing Role: High-efficiency step-up converter with fast transient response and low output ripple for consistent LED brightness. Use Value: Delivers 24V @ 120mA with >85% efficiency at 3.3V input; soft-start prevents LED pop-on and extends diode lifetime. |
| TFT-LCD Bias Supply | Medical Diagnostic Equipment Power |
Use Scenario: Generating 9V, 18V, and –9V simultaneously for LCD panel gate/source drivers in portable ultrasound displays. IC Role / Device Role / Timing Role: Triple-output DC/DC controller with independent soft-start timing per rail to prevent cross-coupling during power-up. Use Value: Replaces three separate converters; maintains tight regulation (±2%) across all rails while meeting IEC 60601 EMI limits. |
Use Scenario: Providing isolated 5V @ 540mA and 12V @ 270mA from 3.3V/5V system rails in handheld ECG or pulse oximeter units. IC Role / Device Role / Timing Role: Primary DC/DC converter delivering stable, low-noise analog and digital supplies with <1µA shutdown current. Use Value: Extends battery life beyond 12 hours per charge; current-mode control ensures immunity to load transients during sensor sampling. |
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 |
|---|---|---|---|
| LT3467AIDDB | 2.1MHz switching frequency vs. 1.3MHz; lower max duty cycle (82% vs. 94%); identical pinout and package. | Better suited for ultra-compact designs requiring sub-1µH inductors; reduced output current capability (430mA @ 5V from 3.3V vs. 540mA). | Select LT3467AIDDB when board space is critical and output current ≤430mA; otherwise LT3467IDDB offers higher current headroom. |
| LT1930IS6 | 6-lead TSOT-23 package (vs. 8-lead DFN); same 1.3MHz frequency but no dedicated SS pin; 40V switch, 600mA current limit. | Limited to simpler boost topologies; lacks programmable soft-start, making it unsuitable for multi-rail or high-reliability medical start-up sequences. | Choose LT1930IS6 only for cost-sensitive, single-output applications where soft-start is not required and thermal constraints allow TSOT-23. |
Compared with LT3467AIDDB and LT1930IS6, the LT3467IDDB uniquely combines 1.3MHz operation, 540mA output capability, dedicated soft-start control, and industrial-temperature DFN packaging - making it optimal for high-reliability, multi-rail portable power systems where startup robustness and current delivery are prioritized.
Availability
LT3467IDDB is available at Aetrix Electronics and suitable for medical diagnostic equipment, TFT-LCD bias supplies, and portable imaging devices requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT3467IDDB 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 series was designed as a monolithic, high-voltage boost/SEPIC controller targeting portable and space-constrained applications requiring reliable, high-efficiency DC/DC conversion with integrated soft-start and wide input voltage support.
FAQ
What is the maximum output voltage achievable with the LT3467IDDB?
The LT3467IDDB supports up to 40V output voltage in boost, SEPIC, or flyback configurations, enabled by its 42V-rated internal NPN switch. This is confirmed in the Absolute Maximum Ratings table and validated in typical applications like the 5V-to-40V boost converter (Figure 3467 TA04a). The 40V limit accounts for diode forward drop and safety margin below the 42V switch rating.
Does the LT3467IDDB require an external soft-start capacitor?
Yes - the LT3467IDDB uses a dedicated SS pin (Pin 7) with a 4µA internal current source that charges an external capacitor to control startup dV/dt. A typical value is 47nF, yielding ~12ms ramp time. Leaving SS floating disables soft-start, risking inrush current and switch overstress - especially critical in high-voltage (>30V) applications.
What is the guaranteed output current capability of the LT3467IDDB at 3.3V input?
The LT3467IDDB delivers 5V at 540mA from a 3.3V input in boost configuration, as specified in the Applications section and validated in Figure 3467 TA01b efficiency curves. This performance assumes proper layout, 2.7µH inductor, MBRM120 Schottky diode, and 15µF X5R output capacitor - all confirmed in the datasheet's reference design.
Is the LT3467IDDB pin-compatible with other regulators in the same family?
Yes - the LT3467IDDB is explicitly stated as pin-for-pin compatible with the LT1930 and LT1613 in the Features section. This includes identical 8-lead DFN pinout (FB, GND, SW, SW, SHDN, SS, VIN, GND), allowing direct substitution without PCB modification in existing LT1930/LT1613 designs.
What package type and temperature grade does the LT3467IDDB use?
The LT3467IDDB uses an 8-lead (3mm × 2mm) plastic DFN package with exposed thermal pad (Pin 9), and is rated for –40°C to 125°C operating junction temperature. This is confirmed in the ORDER INFORMATION table (row LT3467IDDB#TRPBF) and Package Description section (DDB8 drawing).
LT3467IDDB 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 ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (3x2)
LT3467IDDB FAQ
1.How can I place an order for LT3467IDDB through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3467IDDB 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 LT3467IDDB reliable?
The price and inventory of LT3467IDDB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3467IDDB is usually 5 days.
3.What payment methods are accepted for LT3467IDDB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3467IDDB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3467IDDB?
LT3467IDDB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3467IDDB 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 LT3467IDDB?
For technical support, including LT3467IDDB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3467IDDB requirements.
6.How does Aetrix verify that LT3467IDDB is sourced from the original manufacturer or authorized distributors?
All LT3467IDDB 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 LT3467IDDB meets industry standards.
7.What is the process for return or replacement of LT3467IDDB?
All LT3467IDDB units undergo pre-shipment inspection (PSI). If there is an issue with LT3467IDDB, 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 LT3467IDDB part is unused and in its original packaging.
Return procedure for LT3467IDDB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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