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Analog Devices Inc. LT3494EDDB#TRPBF
- Part No.:
- LT3494EDDB#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LT3494EDDB#TRPBF.pdf
- Description:
- IC REG BOOST ADJ 115MA 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:8,666
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Product details
Overview
LT3494EDDB#TRPBF from Analog Devices (formerly Linear Technology) is a micropower, low-noise boost DC/DC converter with integrated NPN power switch, Schottky diode, and PMOS output disconnect. It delivers up to 40V output from 2.3V–16V input, features 180mA switch current limit, 65μA quiescent current, and non-audible switching (>50kHz across full load range), enabling compact OLED power supplies from single Li-ion cells.
For engineers reviewing the LT3494EDDB#TRPBF datasheet, LT3494EDDB#TRPBF pinout, LT3494EDDB#TRPBF application, or LT3494EDDB#TRPBF equivalent, key selection criteria include output disconnect capability, CTRL-pin-based dimming control, ultra-low shutdown current (<1μA), and DFN-8 (3mm × 2mm) thermal performance for space-constrained portable designs.
Technical Context
The LT3494EDDB#TRPBF employs a constant-frequency, current-mode control architecture that maintains switching frequency above 50kHz under all load conditions-eliminating audible noise and simplifying EMI filtering. Its internal 182kΩ feedback resistor and 1.225V reference enable precise output regulation via external top resistor, while the CTRL pin allows real-time output voltage override down to near-input levels.
Operation integrates three critical subsystems: a 180mA NPN switch with 110mV VCE(SAT), an integrated Schottky diode (900–1100mV forward drop at 100mA), and a PMOS output disconnect switch (250mV VDS at 10mA) that isolates VOUT from input during shutdown-ensuring zero-load leakage and true system-level power gating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.3V to 16V - supports single-cell Li-ion (3.0–4.2V), 5V rails, and industrial 12V inputs without pre-regulation. |
| Output Voltage Range | Up to 40V - enables direct driving of OLED displays, white LEDs, and analog sensor biasing circuits. |
| Switch Current Limit | 180mA typical - defines maximum peak inductor current; sets practical output current ceiling (~16mA at 16V out from 3.6V in). |
| Quiescent Current | 65μA active / <1μA shutdown - extends battery life in always-on portable devices with infrequent wake cycles. |
| Switching Frequency | ≥50kHz across full load - avoids audio-band noise; eliminates piezoelectric buzz in handheld enclosures. |
| Feedback Reference | 1.225V ±20mV - enables accurate output setting with standard 1% resistors; internal 182kΩ bottom resistor reduces BOM count. |
| Output Disconnect | PMOS-controlled VOUT isolation - prevents backfeed and residual load discharge during system sleep, critical for multi-rail power sequencing. |
Pinout & Package
LT3494EDDB#TRPBF is housed in an 8-lead 3mm × 2mm plastic DFN package with exposed thermal pad (Pin 9, GND). The package supports high-power-density layouts and requires soldering the exposed pad to PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Collector of internal NPN switch | High-dV/dt node; must minimize trace area to reduce EMI radiation and capacitive coupling. |
| GND (Pin 2) | Power and signal ground reference | Primary return path for switch current and feedback; tie directly to local ground plane. |
| VCC (Pin 3) | Main input supply input | Requires local ceramic bypass (≥4.7μF); feeds internal bias circuitry and switch driver. |
| CTRL (Pin 4) | Auxiliary reference input | Overrides internal 1.225V reference when driven <1.5V; enables dynamic output dimming or programmable voltage scaling. |
| SHDN (Pin 5) | Enable/disable control | Logic-high (>1.5V) enables operation; grounded disables converter and activates output disconnect. |
| FB (Pin 6) | Feedback sensing node | Monitors divided output voltage; internal 182kΩ resistor to GND simplifies resistor-divider design. |
| VOUT (Pin 7) | Drain of output disconnect PMOS | Delivers regulated output; connects to load when enabled; floats to GND during shutdown. |
| CAP (Pin 8) | Cathode of internal Schottky diode | Intermediate node between inductor and output; lower impedance path for inductor current ripple. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated output disconnect | PMOS switch isolates VOUT from input during shutdown-enables true zero-quiescent-load operation and prevents backfeed into source. |
| CTRL-pin dimming interface | Allows real-time adjustment of regulated output voltage from max (set by R1) down to ~VIN level-ideal for OLED brightness control without external DAC. |
| Non-audible switching | Guaranteed >50kHz minimum frequency across entire load range-eliminates coil whine in audio-sensitive applications like MP3 players. |
| Low-noise topology | Novel control technique minimizes output voltage ripple (e.g., <15mV p-p at 16V/16mA) without requiring large LC filters. |
| Tiny DFN-8 package | 3mm × 2mm footprint with exposed thermal pad-reduces board area by >50% vs. comparable SOT-23 solutions while improving thermal resistance (θJA = 76°C/W). |
Applications
| OLED Display Power Supply | Portable Audio Device Power |
|---|---|
Use Scenario: Powering monochrome or color OLED panels in handheld medical instruments or wearables from a single 3.6V Li-ion cell. IC Role / Device Role / Timing Role: Boost converter generating stable 12–18V bias rail with fast transient response to pixel refresh demands. Use Value: Integrated output disconnect prevents panel ghosting during sleep mode; 65μA quiescent current extends battery runtime between measurements. |
Use Scenario: Supplying clean, low-noise 15V rail for headphone amplifier stages in battery-powered MP3 players. IC Role / Device Role / Timing Role: Low-EMI boost regulator delivering regulated output with <15mV p-p ripple at 100MHz BW-minimizing audible noise coupling. Use Value: Non-audible switching frequency (>50kHz) eliminates coil whine during music playback; CTRL pin enables volume-linked dimming of status LEDs. |
| Low-Power Sensor Biasing | Industrial Handheld Terminal |
Use Scenario: Providing precise 24V bias for MEMS pressure sensors or photodiode transimpedance amplifiers in IoT edge nodes. IC Role / Device Role / Timing Role: Micropower DC/DC converter maintaining regulation during intermittent wake/sleep cycles with sub-μA shutdown leakage. Use Value: 1μA shutdown current ensures multi-year battery life; wide 2.3–16V input accommodates aging primary cells or varied energy harvesting sources. |
Use Scenario: Generating 30V logic supply for LCD backlight drivers and 5V auxiliary rail in ruggedized handheld terminals used in field service. IC Role / Device Role / Timing Role: Dual-role power IC providing both main boost output and controlled shutdown sequencing via SHDN pin. Use Value: Output disconnect ensures clean power-down of display subsystems; DFN-8 package withstands mechanical shock and thermal cycling in industrial environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3494AEDDB#TRPBF | 350mA switch current limit (vs. 180mA); identical pinout, package, and feature set. | Supports higher output current (e.g., ~25mA at 16V), suitable for brighter OLEDs or dual-display systems. | Select LT3494AEDDB#TRPBF when load current exceeds 16mA; otherwise LT3494EDDB#TRPBF offers better light-load efficiency. |
| LT3463EDDB#TRPBF | Dual-output (boost + inverter); 250mA switch limit; ±40V output capability; same DFN-8 package. | Replaces two discrete converters in systems requiring both positive and negative bias rails (e.g., op-amp supplies). | Choose LT3463EDDB#TRPBF only if dual-rail generation is required; adds complexity and cost for single-rail use cases. |
Compared with LT3494AEDDB#TRPBF and LT3463EDDB#TRPBF, the LT3494EDDB#TRPBF provides optimal balance of size, efficiency, and simplicity for single-output, low-current OLED and sensor bias applications-delivering lowest quiescent current and smallest solution footprint where >180mA peak switch current is not needed.
Availability
LT3494EDDB#TRPBF is available at Aetrix Electronics and suitable for OLED display power, portable audio device power, low-power sensor biasing, and industrial handheld terminal applications requiring stable component supply, long-lifecycle support, and consistent parametric performance.
Supply support for LT3494EDDB#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 acquired Linear Technology in 2017 and maintains full product continuity, technical documentation, and manufacturing for legacy Linear parts including the LT3494 series.
The LT3494/LT3494A family was designed specifically for space-constrained, battery-powered applications demanding ultra-low quiescent current, low-noise operation, and integrated output disconnect-targeting portable displays, medical wearables, and IoT sensor nodes.
FAQ
What is the maximum output voltage achievable with the LT3494EDDB#TRPBF?
The LT3494EDDB#TRPBF supports output voltages up to 40V, as confirmed by absolute maximum ratings (VOUT ≤ 40V) and electrical characteristics. In practice, stable regulation is maintained up to 35V with appropriate external components (e.g., 15μH inductor, 2.2μF X7R output capacitor), as validated in typical application circuits operating at 16V and 25V outputs.
Does the LT3494EDDB#TRPBF require an external Schottky diode?
No, the LT3494EDDB#TRPBF integrates a Schottky diode internally-its cathode is accessible at the CAP pin. This eliminates the need for an external diode, reducing BOM count and PCB area. The datasheet specifies 900–1100mV forward voltage at 100mA, confirming its integrated implementation.
How does the CTRL pin function on the LT3494EDDB#TRPBF?
The CTRL pin on the LT3494EDDB#TRPBF overrides the internal 1.225V feedback reference when driven below 1.5V. When used, the FB pin regulates to match the CTRL voltage-enabling dynamic output dimming (e.g., for OLED brightness control) without external DACs or digital interfaces. At CTRL ≥ 1.5V, the internal reference remains active.
What is the purpose of the exposed pad on the LT3494EDDB#TRPBF DFN package?
The exposed pad (Pin 9) on the LT3494EDDB#TRPBF is electrically and thermally connected to GND. It must be soldered to a PCB ground plane to ensure proper thermal dissipation (θJA = 76°C/W) and electrical stability. Leaving it unconnected degrades efficiency, increases junction temperature, and risks thermal shutdown under sustained load.
Can the LT3494EDDB#TRPBF operate from a 2.5V input?
Yes, the LT3494EDDB#TRPBF guarantees operation down to 2.3V input, with typical minimum operating voltage of 2.5V per electrical characteristics. It successfully starts and regulates from 2.5V input in typical application circuits, making it suitable for deeply discharged Li-ion cells or low-voltage industrial rails.
LT3494EDDB#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:
- 115mA (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)
LT3494EDDB#TRPBF FAQ
1.How can I place an order for LT3494EDDB#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3494EDDB#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 LT3494EDDB#TRPBF reliable?
The price and inventory of LT3494EDDB#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3494EDDB#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3494EDDB#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3494EDDB#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3494EDDB#TRPBF?
LT3494EDDB#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3494EDDB#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 LT3494EDDB#TRPBF?
For technical support, including LT3494EDDB#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3494EDDB#TRPBF requirements.
6.How does Aetrix verify that LT3494EDDB#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3494EDDB#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 LT3494EDDB#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3494EDDB#TRPBF?
All LT3494EDDB#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3494EDDB#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 LT3494EDDB#TRPBF part is unused and in its original packaging.
Return procedure for LT3494EDDB#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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