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Analog Devices Inc. LT3494EDDB#TRMPBF
- Part No.:
- LT3494EDDB#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LT3494EDDB#TRMPBF.pdf
- Description:
- IC REG BOOST ADJ 115MA 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:21,473
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Product details
Overview
LT3494EDDB#TRMPBF 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), enabling compact OLED power supplies from single Li-ion cells.
For engineers reviewing the LT3494EDDB#TRMPBF datasheet, LT3494EDDB#TRMPBF pinout, LT3494EDDB#TRMPBF application, or LT3494EDDB#TRMPBF equivalent, key selection criteria include its integrated output disconnect capability, CTRL-pin-based analog dimming control, ultra-low shutdown current (<1μA), and DFN-8 (3mm × 2mm) package suitability for space-constrained portable displays and low-noise sensor bias rails.
Technical Context
The LT3494EDDB#TRMPBF 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. Its internal 182kΩ feedback resistor and 1.225V reference enable precise output voltage setting via a single external top resistor.
Operation includes start-up current limiting, automatic shunt current generation at light loads to prevent output overvoltage, and seamless transition between internal reference and external CTRL-voltage override (0V–1.225V) for dynamic output adjustment. The integrated PMOS disconnect isolates VOUT from input during shutdown, reducing system standby leakage.
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 analog sensor bias networks. |
| Switch Current Limit | 180mA (typ) - defines maximum peak inductor current; sets practical output power ceiling (~200mW at 16V out). |
| Quiescent Current | 65μA (active), <1μA (shutdown) - preserves battery life in always-on portable devices with infrequent wake cycles. |
| Switching Frequency | ≥50kHz (min), non-audible across full load - avoids EMI-sensitive audio bands and simplifies filtering. |
| Feedback Reference | 1.225V ±20mV - precision internal reference enables stable output regulation with minimal external components. |
| Package | 8-lead 3mm × 2mm DFN with exposed pad - provides low thermal resistance (θJA = 76°C/W) and compact footprint for handheld designs. |
Pinout & Package
LT3494EDDB#TRMPBF is housed in an 8-lead plastic DFN package (3mm × 2mm) with exposed ground pad (Pin 9), requiring soldering to PCB for thermal and electrical performance. Pin 1 is marked by a bar on the top surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Collector of internal NPN switch | High-dV/dt node; requires minimal trace area to reduce EMI radiation and capacitive coupling. |
| GND (Pin 2) | Power and signal ground reference | Must connect directly to local ground plane; shares return path with exposed pad (Pin 9). |
| VCC (Pin 3) | Main input supply input | Requires local ceramic bypass (≥4.7μF) close to pin; powers internal circuitry and gate drive. |
| CTRL (Pin 4) | Auxiliary reference input | Drives FB to match CTRL voltage (0–1.225V) for analog dimming; tie ≥1.5V to use internal 1.225V reference. |
| SHDN (Pin 5) | Enable/disable control | Logic-high (≥1.5V) enables operation; grounded forces shutdown and activates output disconnect. |
| FB (Pin 6) | Feedback input | Senses output via resistor divider; internal 182kΩ to GND enables single-resistor configuration. |
| VOUT (Pin 7) | PMOS drain output node | Provides isolated output during shutdown; place bulk capacitor here for load regulation stability. |
| CAP (Pin 8) | Schottky cathode / boost node | Connects to inductor and Schottky anode; place 0.22–0.47μF ceramic cap here for ripple filtering. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated output disconnect | PMOS switch isolates VOUT from input during shutdown, eliminating standby leakage into downstream loads. |
| Analog output dimming | CTRL pin accepts 0–1.225V input to dynamically scale output voltage without changing feedback resistors. |
| Low-noise switching | Guaranteed >50kHz operation prevents audible coil whine and eases EMI compliance in portable audio systems. |
| Ultra-low quiescent current | 65μA active / <1μA shutdown enables multi-year battery life in IoT sensors and wearables. |
| Single-resistor feedback | Internal 182kΩ bottom resistor allows output programming with one external top resistor (R1). |
Applications
| OLED Display Power Supply | Portable Audio Bias Rail |
|---|---|
Use Scenario: Powering monochrome or color OLED panels in smartwatches and medical handhelds from a single 3.7V Li-ion cell. IC Role / Device Role / Timing Role: Boost converter providing regulated 12–20V rail with fast transient response to pixel refresh demands. Use Value: Integrated output disconnect prevents panel ghosting during sleep mode; low quiescent current extends battery runtime by >30% vs discrete solutions. |
Use Scenario: Generating clean, low-noise 15V bias for MEMS microphones or op-amp front-ends in Bluetooth headsets. IC Role / Device Role / Timing Role: Low-ripple DC/DC source with non-audible switching frequency to avoid interference in audio signal chain. Use Value: <10mVPP output ripple at 10mA load ensures SNR >95dB; CTRL pin enables volume-linked bias scaling. |
| Low-Power Sensor Excitation | Industrial Data Acquisition Auxiliary Rail |
Use Scenario: Supplying 5–30V excitation voltage to strain gauges, RTDs, or piezoelectric sensors in battery-powered condition monitoring nodes. IC Role / Device Role / Timing Role: Precision-adjustable boost regulator delivering stable excitation independent of battery voltage sag. Use Value: 1.225V reference tolerance (±1.6%) ensures <±0.5% excitation drift; shutdown current <1μA enables 10-year shelf life. |
Use Scenario: Providing isolated 24V auxiliary rail for isolated ADC drivers or level-shifting interfaces in programmable logic controllers. IC Role / Device Role / Timing Role: Compact, low-EMI boost stage feeding isolated DC/DC modules where board space is constrained. Use Value: DFN-8 package (6mm²) reduces layout area by 60% vs SO-8 alternatives; exposed pad improves thermal margin at 85°C ambient. |
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-10 package | Supports bipolar rails (±40V); higher integration but larger footprint and no CTRL-based dimming | Select when dual-rail bias (e.g., op-amp ±15V) is required; not drop-in due to pin count and function mismatch. |
| LT1615ES5#TRMPBF | ThinSOT-5 package, 300mA switch limit, 20μA IQ, no integrated disconnect or CTRL pin | Lacks output isolation and analog dimming; simpler control but requires external MOSFET for disconnect | Choose for cost-sensitive, low-complexity boost only applications where board area is less critical than BOM count. |
Compared with LT3494EDDB#TRMPBF, LT3463EDD#TRPBF adds inverter capability at the expense of dimming control and package size, while LT1615ES5#TRMPBF trades integration for smaller outline and lower IQ-but requires external components to replicate disconnect and dimming functions.
Availability
LT3494EDDB#TRMPBF is available at Aetrix Electronics and suitable for OLED display power, portable audio bias rails, low-power sensor excitation, and industrial data acquisition auxiliary rails requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for LT3494EDDB#TRMPBF 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 its legacy of high-performance analog and power management ICs with rigorous reliability testing and automotive-grade process controls.
The LT3494/LT3494A product line was designed specifically for space-constrained, battery-powered applications demanding ultra-low quiescent current, low-noise operation, and integrated output disconnect-targeting portable displays, wearables, and precision sensing.
FAQ
What is the maximum output voltage supported by the LT3494EDDB#TRMPBF?
The LT3494EDDB#TRMPBF supports output voltages up to 40V, as confirmed by absolute maximum ratings (VOUT ≤ 40V) and typical application circuits achieving 16V and 25V outputs. This rating applies across the full operating temperature range (–40°C to 85°C) and is limited by internal switch and PMOS breakdown characteristics-not by external component selection alone.
Does the LT3494EDDB#TRMPBF include integrated output disconnect, and how does it function?
Yes, the LT3494EDDB#TRMPBF integrates a PMOS output disconnect switch between CAP and VOUT pins. When SHDN is pulled low, the PMOS turns off, isolating the VOUT node from the boost circuit and allowing it to discharge to ground. This prevents backfeed and leakage in standby, a feature explicitly documented in the Applications Information section and verified in Figure 3 of the datasheet.
Can the LT3494EDDB#TRMPBF be used with input voltages below 2.3V?
No-the LT3494EDDB#TRMPBF has a minimum operating voltage of 2.3V (specified in Electrical Characteristics), and operation below this threshold is not guaranteed. Attempting to operate below 2.3V may result in failure to start, unstable regulation, or undefined behavior, as confirmed by the Absolute Maximum Ratings table and startup waveform tests in Figures G13–G15.
What is the purpose of the CTRL pin on the LT3494EDDB#TRMPBF, and what voltage range is valid?
The CTRL pin on the LT3494EDDB#TRMPBF serves as an auxiliary reference input that overrides the internal 1.225V feedback reference when driven between 0V and 1.225V, enabling analog output dimming or dynamic voltage scaling. Driving CTRL ≥1.5V disables override and engages the internal reference, as specified in the PIN FUNCTIONS and APPLICATIONS INFORMATION sections.
Is the LT3494EDDB#TRMPBF pin-compatible with the LT3494AEDDB#TRMPBF?
No-while both share identical pinout and package (DFN-8 DDB), the LT3494EDDB#TRMPBF and LT3494AEDDB#TRMPBF differ in switch current limit (180mA vs 350mA) and associated performance curves (e.g., peak inductor current, efficiency at high load). They are not pin-compatible replacements per manufacturer guidance; substituting requires revalidation of inductor sizing, thermal design, and output current capability.
LT3494EDDB#TRMPBF 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#TRMPBF FAQ
1.How can I place an order for LT3494EDDB#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3494EDDB#TRMPBF 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#TRMPBF reliable?
The price and inventory of LT3494EDDB#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3494EDDB#TRMPBF is usually 5 days.
3.What payment methods are accepted for LT3494EDDB#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3494EDDB#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3494EDDB#TRMPBF?
LT3494EDDB#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3494EDDB#TRMPBF 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#TRMPBF?
For technical support, including LT3494EDDB#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3494EDDB#TRMPBF requirements.
6.How does Aetrix verify that LT3494EDDB#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LT3494EDDB#TRMPBF 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#TRMPBF meets industry standards.
7.What is the process for return or replacement of LT3494EDDB#TRMPBF?
All LT3494EDDB#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3494EDDB#TRMPBF, 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#TRMPBF part is unused and in its original packaging.
Return procedure for LT3494EDDB#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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