My Inquiry
My Account
Analog Devices Inc. LT3494AEDDB#TRMPBF
- Part No.:
- LT3494AEDDB#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LT3494AEDDB#TRMPBF.pdf
- Description:
- IC REG BOOST ADJ 225MA 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:6,609
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LT3494AEDDB#TRMPBF from Analog Devices (formerly Linear Technology) is a micropower, low-noise boost converter IC 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#TRMPBF datasheet, LT3494AEDDB#TRMPBF pinout, LT3494AEDDB#TRMPBF application, or LT3494AEDDB#TRMPBF equivalent, key selection criteria include guaranteed 350mA peak switch current limit, 1.225V ±20mV feedback reference accuracy, non-audible fixed-frequency operation, integrated output disconnect for true shutdown isolation, and compatibility with ceramic output capacitors down to 2.2μF.
Technical Context
The LT3494AEDDB#TRMPBF employs a constant-frequency, current-mode control architecture that enforces minimum switching frequency ≥47kHz under all load conditions-eliminating audible noise. Its internal NPN power switch features 350mA current limiting (vs. 180mA in LT3494), and the integrated PMOS disconnect ensures VOUT is fully isolated from input during shutdown.
Operation relies on precise 1.225V feedback reference with ±20mV offset over temperature, supported by an internal 182kΩ bottom resistor. The CTRL pin enables dynamic output voltage adjustment down to near-VIN level by overriding the internal reference, supporting analog dimming in display applications without external DACs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.3V to 16V - supports direct connection to Li-ion (3.0–4.2V), 5V rails, and industrial 12V inputs. |
| Output Voltage Range | Up to 40V - sufficient for driving white OLEDs, PMOLEDs, and high-voltage bias rails. |
| Switch Current Limit | 350mA typical - enables higher output power than LT3494 (180mA), critical for 15–30mA OLED loads at 16V. |
| Quiescent Current | 65μA active / <1μA shutdown - preserves battery life in portable devices with intermittent display usage. |
| Feedback Reference | 1.225V ±20mV - ensures stable regulation with <±1% output error when using standard 1% resistors. |
| Switching Frequency | ≥47kHz min - stays above audio band (20Hz–20kHz) across 0.1–100mA load, preventing coil whine. |
| Package | 8-lead 3mm × 2mm DFN - compact footprint with exposed thermal pad for efficient heat dissipation in space-constrained designs. |
Pinout & Package
LT3494AEDDB#TRMPBF is housed in an 8-lead plastic DFN package (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 integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Collector of internal NPN switch | High-di/dt node; must use minimal trace area and solid ground plane beneath to suppress EMI. |
| GND (Pin 2) | Power and signal ground reference | Direct connection to local ground plane; ties to exposed pad (Pin 9) for thermal conduction. |
| VCC (Pin 3) | Main input supply input | Requires local 4.7μF X5R/X7R ceramic bypass capacitor placed within 2mm of pin. |
| CTRL (Pin 4) | Auxiliary reference override input | Drives FB to match CTRL voltage (0–1.5V); enables analog dimming without external DAC or PWM filtering. |
| SHDN (Pin 5) | Enable/disable control input | Logic-high (>1.5V) enables; grounded disables with <1μA shutdown current and full output disconnect. |
| FB (Pin 6) | Feedback input for output regulation | Compares against 1.225V reference; internal 182kΩ resistor to GND simplifies divider design. |
| VOUT (Pin 7) | Drain of output disconnect PMOS | Connects to load when enabled; pulled to GND during shutdown-provides true output isolation. |
| CAP (Pin 8) | Cathode of internal Schottky diode | Node where inductor connects; requires 0.22–0.47μF ceramic capacitor for ripple filtering. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated output disconnect | PMOS switch isolates VOUT from input during shutdown-prevents backfeed and enables zero-load leakage in battery-powered systems. |
| Non-audible switching | Guaranteed >47kHz minimum frequency eliminates coil whine across entire 0.1–100mA load range-critical for consumer audio-adjacent devices. |
| Low-noise regulation | Peak-to-peak output ripple ≤10mV at 16V/16mA (100MHz BW)-achieved via optimized control loop and integrated Schottky diode. |
| Dynamic output control | CTRL pin allows real-time analog adjustment of output voltage from max (set by R1) down to ~VIN-enables seamless OLED brightness scaling. |
| Micropower operation | 65μA quiescent current + <1μA shutdown draw extends runtime in always-on portable displays and wearables. |
Applications
| OLED Display Power Supply | Low-Noise Portable Audio Bias |
|---|---|
Use Scenario: Powering monochrome or color PMOLED panels in smartwatches and medical wearables from a single 3.6V Li-ion cell. IC Role / Device Role / Timing Role: Boost converter generating stable 12–18V rail with ultra-low ripple to drive OLED anodes while maintaining contrast uniformity. Use Value: Integrated disconnect prevents panel ghosting during sleep mode; 65μA IQ extends battery life beyond 7 days in typical usage. | Use Scenario: Providing clean, adjustable high-voltage bias for MEMS microphones and Class-D amplifier gate drivers in Bluetooth earbuds. IC Role / Device Role / Timing Role: Low-EMI boost regulator delivering 15V @ 5mA with <10mVpp ripple-minimizing noise coupling into sensitive analog front-ends. Use Value: Non-audible switching avoids interference with 20Hz–20kHz audio band; CTRL pin enables adaptive bias scaling during different playback modes. |
| MP3 Player LCD Backlight | Industrial Sensor Bias Supply |
Use Scenario: Driving white LED strings or TFT-LCD CCFL inverters in handheld media players with variable brightness control. IC Role / Device Role / Timing Role: Adjustable-output boost converter supplying 24–30V to backlight driver ICs, dimmed via CTRL pin voltage modulation. Use Value: Eliminates need for external PWM-to-analog converter; 350mA switch current supports up to 30mA backlight loads at 25V. | Use Scenario: Generating stable 36V bias for piezoelectric actuators or high-voltage op-amp rails in portable test equipment. IC Role / Device Role / Timing Role: Wide-input (2.3–16V), high-output (up to 40V) DC/DC converter with robust thermal performance in sealed enclosures. Use Value: Exposed-pad DFN package sustains 125°C junction temperature; 40V absolute max rating provides margin for transient spikes 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 |
|---|---|---|---|
| LT3467AEDD#TRPBF | 1.1A switch current limit, 2.1MHz switching, soft-start, 40V max output, 1.2mA IQ | Higher power, faster transient response, but 18× higher quiescent current-unsuitable for battery-critical designs | Select LT3467AEDD#TRPBF only when >350mA output current or sub-10μs transient recovery is required; not drop-in due to different pinout and control scheme. |
| LT1615EMS8#TRPBF | 300mA switch current, 1.4MHz, 34V max output, 20μA IQ, ThinSOT-8 package | Lower max output voltage (34V vs 40V), no integrated disconnect, higher IQ than LT3494A but still micropower | Choose LT1615EMS8#TRPBF for cost-sensitive, lower-voltage (<34V) applications where board space permits larger ThinSOT footprint and output isolation is handled externally. |
Compared with LT3467AEDD#TRPBF and LT1615EMS8#TRPBF, LT3494AEDDB#TRMPBF uniquely combines 350mA current capability, true output disconnect, <1μA shutdown, and 40V output in a 3mm × 2mm DFN-making it optimal for space- and battery-constrained OLED and portable sensor bias applications where isolation and ultra-low IQ are mandatory.
Availability
LT3494AEDDB#TRMPBF 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-term lifecycle support, and RoHS-compliant packaging.
Supply support for LT3494AEDDB#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, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors.
The LT3494A belongs to Linear's micropower DC/DC converter product line, designed specifically for battery-powered portable electronics requiring ultra-low quiescent current, non-audible operation, and integrated power-path protection.
FAQ
What is the maximum output voltage achievable with the LT3494AEDDB#TRMPBF?
The LT3494AEDDB#TRMPBF supports output voltages up to 40V, as confirmed by its absolute maximum SW, CAP, and VOUT ratings. In practical designs using standard external components (e.g., 15μH inductor, 2.2μF output capacitor), stable regulation has been demonstrated at 16V–25V for OLED applications. Output voltage is set by the FB resistor divider and can be dynamically adjusted downward via the CTRL pin.
Does the LT3494AEDDB#TRMPBF provide true output isolation during shutdown?
Yes, the LT3494AEDDB#TRMPBF integrates a PMOS output disconnect switch between CAP and VOUT. When SHDN is pulled low, this switch turns off, isolating the VOUT node from both input and internal circuitry. Measurements confirm VOUT discharges to ground through external load or bleed resistors-enabling zero-power standby in battery-powered systems.
How does the CTRL pin function in the LT3494AEDDB#TRMPBF?
The CTRL pin on the LT3494AEDDB#TRMPBF serves as an auxiliary reference input that overrides the internal 1.225V feedback reference when driven below 1.5V. With CTRL tied to a DAC or potentiometer, the output voltage scales linearly from its maximum (set by R1) down to approximately VIN-enabling analog dimming of OLED displays without PWM filtering or additional ICs.
What is the guaranteed switch current limit for the LT3494AEDDB#TRMPBF?
The LT3494AEDDB#TRMPBF guarantees a typical peak switch current limit of 350mA, as specified in the Electrical Characteristics table (Note 5). This is a key differentiator from the LT3494 (180mA limit) and enables higher output power in applications such as 30mA OLED loads at 16V, where inductor saturation and efficiency must be carefully managed.
Which package type and dimensions does the LT3494AEDDB#TRMPBF use?
The LT3494AEDDB#TRMPBF uses an 8-lead plastic DFN package measuring 3.00mm × 2.00mm with 0.50mm pitch. It features an exposed thermal pad (Pin 9) that must be soldered to the PCB ground plane per LTC DWG #05-08-1702 Rev B. The part marking "LCRW" appears on the top surface, and the package is lead-free and RoHS-compliant.
LT3494AEDDB#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:
- 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#TRMPBF FAQ
1.How can I place an order for LT3494AEDDB#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3494AEDDB#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 LT3494AEDDB#TRMPBF reliable?
The price and inventory of LT3494AEDDB#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3494AEDDB#TRMPBF is usually 5 days.
3.What payment methods are accepted for LT3494AEDDB#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3494AEDDB#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3494AEDDB#TRMPBF?
LT3494AEDDB#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3494AEDDB#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 LT3494AEDDB#TRMPBF?
For technical support, including LT3494AEDDB#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3494AEDDB#TRMPBF requirements.
6.How does Aetrix verify that LT3494AEDDB#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LT3494AEDDB#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 LT3494AEDDB#TRMPBF meets industry standards.
7.What is the process for return or replacement of LT3494AEDDB#TRMPBF?
All LT3494AEDDB#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3494AEDDB#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 LT3494AEDDB#TRMPBF part is unused and in its original packaging.
Return procedure for LT3494AEDDB#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT3494AEDDB#TRMPBF Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
