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Analog Devices Inc. LT3494AEDDB#TRPBF
- Part No.:
- LT3494AEDDB#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LT3494AEDDB#TRPBF.pdf
- Description:
- IC REG BOOST ADJ 225MA 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:11,647
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Product details
Overview
LT3494AEDDB#TRPBF from Analog Devices (formerly Linear Technology) is a micropower, low-noise boost DC/DC converter with integrated 350mA NPN switch, Schottky diode, and PMOS output disconnect. It operates from 2.3V to 16V input, delivers up to 40V output, maintains switching frequency >47kHz across full load range, and draws only 65μA quiescent current - enabling efficient OLED power supply from a single Li-ion cell.
For engineers reviewing the LT3494AEDDB#TRPBF datasheet, LT3494AEDDB#TRPBF pinout, LT3494AEDDB#TRPBF application, or LT3494AEDDB#TRPBF equivalent, key selection criteria include guaranteed 350mA peak switch current limit, integrated output disconnect for true shutdown isolation, auxiliary CTRL pin for real-time output voltage dimming, and operation in a compact 3mm × 2mm 8-lead DFN package with exposed thermal pad.
Technical Context
The LT3494AEDDB#TRPBF employs a constant-frequency, current-mode control architecture with adaptive minimum off-time regulation to maintain switching frequency above the audio band (≥47kHz) under all load conditions. Its internal 182kΩ bottom feedback resistor and 1.225V reference enable precise output voltage setting via a single external top resistor.
It integrates three critical power functions: a high-gain NPN power switch (350mA current limit), a low-VF Schottky diode (900–1100mV at 100mA), and a PMOS output disconnect switch (250mV VCAP–VOUT drop at 10mA), enabling zero-output leakage during shutdown and flexible feedback node selection (CAP or VOUT).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.3V to 16V - supports direct operation from single Li-ion (3.0–4.2V) or wide industrial rails. |
| Output Voltage Range | Up to 40V - enables driving high-voltage OLED displays or white LED strings without external components. |
| Switch Current Limit | 350mA (typical) - defines maximum inductor peak current and sets practical output power ceiling (~500mW at 16V out). |
| Quiescent Current | 65μA (active), <1μA (shutdown) - preserves battery life in always-on portable systems with infrequent wake cycles. |
| Feedback Reference | 1.225V ±20mV - precision internal reference with 182kΩ integrated bottom resistor simplifies feedback network design. |
| CTRL Pin Function | 0–1.5V override range - allows analog dimming of output voltage down to near-input level for display brightness control. |
| Switching Frequency | ≥47kHz (min), ~500kHz (typ at light load) - stays outside audible range to eliminate coil whine in consumer audio-adjacent devices. |
| Package | 8-lead 3mm × 2mm DFN with exposed GND pad - provides low thermal resistance (θJA = 76°C/W) and space-efficient layout for ultra-thin handhelds. |
Pinout & Package
LT3494AEDDB#TRPBF is housed in an 8-lead plastic DFN (3mm × 2mm) with exposed thermal pad (Pin 9, GND). The package requires soldering of the exposed pad to PCB ground plane for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Collector of internal NPN switch | High-dV/dt node; must use minimal trace area and tight loop to CAP/GND to suppress EMI. |
| GND (Pin 2) | Power and signal ground reference | Connect directly to local ground plane; ties to exposed pad (Pin 9) for thermal path. |
| VCC (Pin 3) | Main input supply input | Requires local 4.7μF ceramic bypass capacitor; powers internal bias circuitry and gate drive. |
| CTRL (Pin 4) | Auxiliary reference input | Drives FB comparator when ≤1.5V; enables real-time output voltage dimming without changing feedback resistors. |
| SHDN (Pin 5) | Active-high enable control | Logic-high (≥1.5V) enables regulation; grounded forces <1μA shutdown current and activates PMOS disconnect. |
| FB (Pin 6) | Feedback input | Senses regulated node (VOUT or CAP); internal 182kΩ resistor to GND sets divider ratio with external R1. |
| VOUT (Pin 7) | Drain of output disconnect PMOS | Provides isolated output during shutdown; connect load here for true 0V discharge or to CAP for higher efficiency. |
| CAP (Pin 8) | Cathode of internal Schottky diode | Primary energy transfer node; place 0.22–0.47μF ceramic capacitor here to filter inductor ripple current. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Output Disconnect | PMOS switch isolates VOUT from input during shutdown, enabling true zero-load leakage and safe system power sequencing. |
| Non-Audible Switching | Guaranteed minimum 47kHz switching frequency eliminates audible coil noise across 0.1–100mA load range. |
| Low-Noise Power Delivery | Peak-to-peak output ripple <10mV at 16V/16mA (100MHz BW) due to optimized control loop and integrated Schottky. |
| Dimmable Output Voltage | CTRL pin accepts 0–1.5V analog signal to dynamically scale output from max (set by R1) down to near-VIN level. |
| Micropower Operation | 65μA quiescent current enables >1-year battery life in low-duty-cycle sensor nodes powered by coin cells. |
| Robust Input Range | 2.3V start-up supports brown-out tolerant operation down to partially discharged Li-ion or alkaline batteries. |
Applications
| OLED Display Power Supply | Portable Audio Device Power |
|---|---|
Use Scenario: Powering monochrome or color OLED panels (12–24V) from a single 3.6V Li-ion battery in smartwatches or wearables. IC Role / Device Role / Timing Role: Primary boost regulator with output disconnect ensuring display turns off cleanly during sleep mode. Use Value: 65μA quiescent current extends battery runtime; non-audible switching prevents interference with on-board audio codecs. | Use Scenario: Generating clean 15V bias for headphone amplifiers or DAC output stages in MP3 players and Bluetooth earbuds. IC Role / Device Role / Timing Role: Low-noise, high-efficiency boost converter supplying analog signal chain rails. Use Value: <10mVpp output ripple ensures SNR >95dB; integrated Schottky minimizes conduction loss for >85% efficiency at 10mA load. |
| Industrial Sensor Node Supply | Medical Diagnostic Handheld |
Use Scenario: Providing stable 20V rail for MEMS pressure sensors or piezoelectric transducers in battery-powered IoT edge nodes. IC Role / Device Role / Timing Role: Micropower DC/DC converter enabling multi-year operation on primary lithium batteries. Use Value: <1μA shutdown current prevents battery drain during extended idle periods; wide 2.3–16V input accommodates aging battery profiles. | Use Scenario: Delivering regulated 30V for photodiode bias or optical sensor excitation in portable pulse oximeters or glucose meters. IC Role / Device Role / Timing Role: High-voltage, low-noise boost stage with precise output control via CTRL pin. Use Value: 1.225V feedback reference with 0.5% tolerance ensures accurate sensor bias; CTRL dimming allows dynamic gain adjustment during measurement. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3463AEDD#TRPBF | Dual-output (boost + inverter), 250mA switch limit, 40V max output, 40μA IQ | Supports bipolar rails (±VOUT); lower switch current limits max single-rail power | Choose for systems needing both positive and negative bias rails from one IC; not suitable for >250mA single-output loads. |
| LT3471EDE#TRPBF | 1.3A switch limit, dual boost/inverter, 40V max output, 2.5mA IQ, DFN-12 | Higher power capability but 38× higher quiescent current; larger package | Choose when >350mA output current or dual-rail capability is required; avoid in battery-critical applications. |
Compared with LT3463AEDD#TRPBF and LT3471EDE#TRPBF, the LT3494AEDDB#TRPBF uniquely balances ultra-low IQ (65μA), 350mA switch capability, and single-rail simplicity in the smallest footprint - making it optimal for space-constrained, long-life OLED and sensor power applications where audio-band noise must be avoided.
Availability
LT3494AEDDB#TRPBF is available at Aetrix Electronics and suitable for OLED display power, portable audio bias supplies, industrial sensor nodes, medical handheld diagnostics, and low-noise analog rail generation requiring stable component supply and long-term manufacturability.
Supply support for LT3494AEDDB#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, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LT3494AEDDB#TRPBF belongs to Linear's micropower DC/DC converter product line, designed specifically for battery-powered portable electronics requiring ultra-low quiescent current, low-noise output, and compact size - especially OLED, LCD, and sensor bias applications.
FAQ
What is the guaranteed peak switch current limit for LT3494AEDDB#TRPBF?
The LT3494AEDDB#TRPBF has a guaranteed peak switch current limit of 350mA (typical), as specified in the Electrical Characteristics table under "Switch Current Limit" for the LT3494A variant. This value is confirmed across temperature and process corners and defines the maximum inductor peak current the device can sustain before foldback or shutdown.
Can LT3494AEDDB#TRPBF operate from a single 3V alkaline cell?
Yes, the LT3494AEDDB#TRPBF supports input voltages as low as 2.3V (minimum operating voltage), making it fully compatible with a fresh 3V alkaline cell (nominal 1.5V × 2). Its 65μA quiescent current and ability to start up at 2.3V ensure reliable operation even as the battery discharges below 2.5V.
How does the CTRL pin function in LT3494AEDDB#TRPBF?
The CTRL pin on the LT3494AEDDB#TRPBF serves as an auxiliary reference input that overrides the internal 1.225V feedback reference when driven between 0V and 1.5V. When used, the output voltage is regulated so that the FB pin voltage matches the CTRL voltage - enabling analog dimming or dynamic output scaling without changing external resistors.
What is the purpose of the exposed pad on the LT3494AEDDB#TRPBF DFN package?
The exposed pad (Pin 9) on the LT3494AEDDB#TRPBF is electrically and thermally connected to GND. It must be soldered to a PCB ground plane to achieve the specified θJA of 76°C/W and ensure reliable thermal performance under continuous 350mA switching current. Leaving it unconnected degrades efficiency and risks thermal shutdown.
Does LT3494AEDDB#TRPBF provide true output disconnect during shutdown?
Yes, the LT3494AEDDB#TRPBF integrates a PMOS output disconnect switch between CAP and VOUT. When SHDN is pulled low, the PMOS turns off, isolating the VOUT node from the input path and allowing it to discharge to ground - delivering true zero-load leakage and enabling clean power sequencing in multi-rail systems.
LT3494AEDDB#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
- Output Configuration:
- Positive
- Topology:
- Boost
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.3V
- Voltage - Input (Max):
- 16V
- Voltage - Output (Min/Fixed):
- 2.3V
- Voltage - Output (Max):
- 40V (Switch)
- Current - Output:
- 225mA (Switch)
- Frequency - Switching:
- -
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (3x2)
LT3494AEDDB#TRPBF FAQ
1.How can I place an order for LT3494AEDDB#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3494AEDDB#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 LT3494AEDDB#TRPBF reliable?
The price and inventory of LT3494AEDDB#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3494AEDDB#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3494AEDDB#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3494AEDDB#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3494AEDDB#TRPBF?
LT3494AEDDB#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3494AEDDB#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 LT3494AEDDB#TRPBF?
For technical support, including LT3494AEDDB#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3494AEDDB#TRPBF requirements.
6.How does Aetrix verify that LT3494AEDDB#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3494AEDDB#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 LT3494AEDDB#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3494AEDDB#TRPBF?
All LT3494AEDDB#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3494AEDDB#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 LT3494AEDDB#TRPBF part is unused and in its original packaging.
Return procedure for LT3494AEDDB#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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