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Analog Devices Inc. LT3494EDDB#TRM
- Part No.:
- LT3494EDDB#TRM
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LT3494EDDB#TRM.pdf
- Description:
- IC REG BOOST ADJ 115MA 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,254
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Product details
Overview
LT3494EDDB#TRM from Analog Devices (formerly Linear Technology) is a micropower, low-noise boost converter IC with integrated NPN power switch, Schottky diode, and PMOS output disconnect circuitry. It delivers up to 40V output from 2.3V–16V input, features 180mA switch current limit, 65μA quiescent current, and non-audible switching frequency (>50kHz) across full load range-designed for OLED display power supplies from single Li-ion cells.
For engineers reviewing the LT3494EDDB#TRM datasheet, LT3494EDDB#TRM pinout, LT3494EDDB#TRM application, or LT3494EDDB#TRM equivalent, key selection criteria include its integrated output disconnect capability, CTRL-pin-based analog dimming control, ultra-low shutdown current (<1μA), and 3mm × 2mm DFN-8 package with exposed thermal pad.
Technical Context
The LT3494EDDB#TRM employs a constant-frequency, current-mode control architecture with adaptive minimum off-time regulation to maintain switching frequency above 50kHz under all load conditions-eliminating audible noise in portable audio-sensitive applications. Its internal 182kΩ feedback resistor and 1.225V reference enable precise output voltage setting via a single external top resistor.
Operation includes start-up mode triggered when FB voltage falls below half the CTRL voltage (or internal reference if CTRL ≥1.5V), and shunt current control that auto-adjusts to maintain regulation at light loads without sacrificing efficiency. The integrated PMOS disconnect ensures VOUT isolation during shutdown, while the internal Schottky diode eliminates external component count.
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), 3.3V/5V rails, or wide industrial inputs. |
| Output Voltage Range | Up to 40V - enables driving high-voltage OLED panels, white LED strings, or sensor bias supplies. |
| 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 - preserves battery life in always-on or duty-cycled portable systems. |
| Switching Frequency | >50kHz min - stays outside audible band (20Hz–20kHz) across 0.1–100mA load, preventing piezo-induced noise in enclosures. |
| Feedback Reference | 1.225V ±20mV - precision internal reference with 182kΩ bottom resistor simplifies feedback network design. |
| CTRL Pin Function | Analog override down to 0V - enables real-time output voltage dimming or contrast control without external DAC or PWM filtering. |
Pinout & Package
LT3494EDDB#TRM is housed in an 8-lead 3mm × 2mm plastic DFN package (DDB) with exposed thermal pad (Pin 9) soldered to PCB ground for thermal and electrical performance. Pin 1 marked by bar; top-side marking "LCCD".
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Switch collector node | Connects to inductor and Schottky cathode; high dv/dt node requiring minimal trace area to reduce EMI. |
| GND (Pin 2) | Power and signal ground | Primary ground return; must tie directly to local ground plane and exposed pad. |
| VCC (Pin 3) | Input supply input | Bypass with ≥4.7μF ceramic capacitor close to pin; powers internal circuitry and gate drive. |
| CTRL (Pin 4) | Auxiliary reference input | Drives FB comparator reference; 0–1.225V sets output voltage; >1.5V enables internal 1.225V reference. |
| SHDN (Pin 5) | Enable/disable control | Logic-high (≥1.5V) enables; grounded disables with <1μA quiescent current and VOUT disconnect. |
| FB (Pin 6) | Feedback sense input | Monitors resistive divider; internal 182kΩ to GND enables single-resistor configuration for VOUT setting. |
| VOUT (Pin 7) | PMOS drain output | Provides regulated output with integrated disconnect; connect load here for true shutdown isolation. |
| CAP (Pin 8) | Schottky cathode node | Internal Schottky anode tied to SW; bypass with 0.22–0.47μF capacitor for ripple filtering. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Output Disconnect | PMOS switch isolates VOUT from input during shutdown, enabling true zero-load leakage and system-level power sequencing. |
| Low-Noise Switching Architecture | Guaranteed >50kHz minimum frequency eliminates audible coil whine and reduces EMI filter requirements. |
| Ultra-Low Quiescent Current | 65μA operating / <1μA shutdown enables multi-year battery life in IoT sensors and wearables. |
| Single-Resistor Feedback | Internal 182kΩ bottom resistor + 1.225V reference allows output programming with one external top resistor (R1). |
| CTRL-Pin Analog Dimming | Direct voltage-controlled output adjustment enables smooth OLED brightness control without PWM artifacts or external DAC. |
Applications
| OLED Display Power Supply | Portable Audio Device Power |
|---|---|
Use Scenario: Powering monochrome or color OLED displays in handheld medical instruments or smart badges from a single 3.6V Li-ion cell. IC Role / Device Role / Timing Role: Boost converter generating stable 12–18V rail with fast transient response to pixel refresh current spikes. Use Value: Integrated disconnect prevents display ghosting during sleep mode; low quiescent current extends battery runtime beyond 3 years in low-duty-cycle use. | Use Scenario: Supplying clean, low-noise bias voltage to MEMS microphones and Class-D amplifier rails in Bluetooth earbuds. IC Role / Device Role / Timing Role: Low-EMI DC/DC source delivering ripple-free 5V/10V outputs synchronized to audio sampling clocks. Use Value: Non-audible switching frequency avoids coupling into analog audio paths; 65μA IQ minimizes standby drain during call-waiting states. |
| MP3 Player Backlight Driver | Industrial Sensor Bias Supply |
Use Scenario: Driving white LED backlight in legacy MP3 players using aging Li-ion batteries with sagging voltage profiles. IC Role / Device Role / Timing Role: Wide-input (2.3–16V) boost regulator maintaining constant LED current despite battery discharge from 4.2V to 3.0V. Use Value: CTRL pin enables software-controlled brightness scaling; integrated Schottky eliminates forward drop loss and thermal derating. | Use Scenario: Generating precise +15V/-15V bias for analog front-end op-amps in portable gas analyzers or pH meters. IC Role / Device Role / Timing Role: Primary high-efficiency boost stage feeding an inverting charge-pump or LDO post-regulator. Use Value: 1.225V reference tolerance (±20mV) and low tempco ensure stable bias over –40°C to 85°C operating range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3463EDD#TRPBF | Dual-output (boost + inverter); 250mA switch limit; 40μA IQ; same DFN-8 package. | Supports bipolar supplies; lacks integrated output disconnect and CTRL-based dimming. | Choose when dual-rail bias is required and VOUT isolation is not critical. |
| LT1615ES5#TR | ThinSOT-5 package; 300mA switch limit; 20μA IQ; no integrated Schottky or disconnect. | Higher output current but requires external diode and shutdown FET; smaller footprint but lower thermal performance. | Prefer for space-constrained designs where external components are acceptable and higher load current is needed. |
Compared with LT3494EDDB#TRM, LT3463EDD#TRPBF offers dual-rail capability at the cost of dimming control and disconnect, while LT1615ES5#TR trades integration and thermal robustness for compact size-making LT3494EDDB#TRM optimal for single-rail, low-noise, battery-sensitive OLED applications.
Availability
LT3494EDDB#TRM is available at Aetrix Electronics and suitable for OLED display power, portable audio bias, MP3 player backlighting, and industrial sensor bias applications requiring stable component supply, long-lifecycle support, and guaranteed parametric performance.
Supply support for LT3494EDDB#TRM 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 support, documentation, and manufacturing continuity for the LT series.
The LT3494EDDB#TRM belongs to Linear's micropower DC/DC converter family, engineered specifically for space- and noise-constrained portable electronics where battery life, EMI compliance, and output isolation are critical design requirements.
FAQ
What is the maximum output voltage achievable with the LT3494EDDB#TRM?
The LT3494EDDB#TRM supports output voltages up to 40V, limited by the absolute maximum rating of the SW, CAP, and VOUT pins. In practice, stable regulation is maintained up to 36V with appropriate external components (e.g., 15μH inductor, 10μF output capacitor rated ≥50V). The LT3494EDDB#TRM achieves this using its internal 180mA NPN switch and integrated Schottky diode, eliminating need for external high-voltage diodes.
Does the LT3494EDDB#TRM require an external Schottky diode?
No, the LT3494EDDB#TRM integrates a Schottky diode between the SW and CAP pins, removing the need for an external diode. This reduces BOM count, PCB area, and forward voltage drop losses. The internal diode is rated for 100mA continuous forward current and 900–1100mV VF at 100mA, as confirmed in the Electrical Characteristics table of the LT3494/LT3494A datasheet.
How does the CTRL pin function on the LT3494EDDB#TRM?
The CTRL pin on the LT3494EDDB#TRM serves as an auxiliary reference input that overrides the internal 1.225V feedback reference when driven below 1.225V. When CTRL is held ≥1.5V, the LT3494EDDB#TRM uses its internal reference; when CTRL is set between 0V and 1.225V, the output voltage tracks CTRL linearly (per Figure 3494 F01), enabling analog dimming. This function is unique to the LT3494EDDB#TRM and not shared by pin-compatible alternatives like LT1615.
What is the purpose of the exposed pad (Pin 9) on the LT3494EDDB#TRM?
The exposed pad (Pin 9) on the LT3494EDDB#TRM 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 stable operation under load. Leaving it unconnected degrades efficiency, increases junction temperature, and may cause thermal shutdown or parameter drift-confirmed in the Package/Order Information section of the LT3494 datasheet.
Can the LT3494EDDB#TRM operate from a 2.3V input supply?
Yes, the LT3494EDDB#TRM is specified to operate down to 2.3V minimum input voltage, making it suitable for deeply discharged Li-ion cells or low-voltage industrial rails. At 2.3V input, it can still deliver regulated output (e.g., 12V) with reduced efficiency and output current capability-verified in Figure 3494 G02 (Load Regulation) and Table 1 (Electrical Characteristics) where VIN(MIN) = 2.3V is explicitly listed.
LT3494EDDB#TRM Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (3x2)
LT3494EDDB#TRM FAQ
1.How can I place an order for LT3494EDDB#TRM through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3494EDDB#TRM 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#TRM reliable?
The price and inventory of LT3494EDDB#TRM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3494EDDB#TRM is usually 5 days.
3.What payment methods are accepted for LT3494EDDB#TRM?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3494EDDB#TRM transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3494EDDB#TRM?
LT3494EDDB#TRM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3494EDDB#TRM 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#TRM?
For technical support, including LT3494EDDB#TRM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3494EDDB#TRM requirements.
6.How does Aetrix verify that LT3494EDDB#TRM is sourced from the original manufacturer or authorized distributors?
All LT3494EDDB#TRM 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#TRM meets industry standards.
7.What is the process for return or replacement of LT3494EDDB#TRM?
All LT3494EDDB#TRM units undergo pre-shipment inspection (PSI). If there is an issue with LT3494EDDB#TRM, 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#TRM part is unused and in its original packaging.
Return procedure for LT3494EDDB#TRM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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