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Analog Devices Inc. LT3495BEDDB-1#TRMPBF
- Part No.:
- LT3495BEDDB-1#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LT3495BEDDB-1#TRMPBF.pdf
- Description:
- IC REG BST SEPIC ADJ 275MA 10DFN
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LT3495BEDDB-1#TRMPBF from Analog Devices (formerly Linear Technology) is a micropower, low-noise boost converter IC with integrated 350mA NPN power switch, internal feedback resistor, and PMOS output disconnect circuitry. It operates from 2.5V to 16V input, delivers up to 40V output, maintains switching frequency above 45kHz across load range, and draws only 60µA quiescent current - enabling efficient OLED power supply from a single Li-ion cell.
For engineers reviewing the LT3495BEDDB-1#TRMPBF datasheet, LT3495BEDDB-1#TRMPBF pinout, LT3495BEDDB-1#TRMPBF application, or LT3495BEDDB-1#TRMPBF equivalent, key selection criteria include its fixed 350mA switch current limit, guaranteed audio-band–free operation, integrated output disconnect for true shutdown isolation, and CTRL-pin–enabled analog dimming capability in compact 3mm × 2mm DFN.
Technical Context
The LT3495BEDDB-1#TRMPBF employs a variable peak-current, variable off-time control architecture that dynamically adjusts both inductor peak current and switch off-time to maintain high efficiency and low output ripple across wide load ranges. Its minimum off-time is clamped at 200ns after start-up, and maximum off-time is limited to 35µs to enforce ≥45kHz minimum switching frequency - preventing audible noise generation.
This variant belongs to the LT3495-1 subfamily, distinguished by a 350mA typical switch current limit (vs. 650mA in LT3495/LT3495B), identical 1.235V FB reference, integrated 76kΩ bottom feedback resistor, and auxiliary CTRL pin that overrides the internal reference down to 0V for real-time output voltage adjustment - supporting OLED brightness control without external DACs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 16V - supports direct operation from single Li-ion (3.0–4.2V), 5V rails, or industrial 12V inputs. |
| Output Voltage Range | Up to 40V - enables driving multi-series OLED panels or white LED strings from low-voltage sources. |
| Switch Current Limit | 350mA typical - defines maximum inductor peak current; determines max output power at given VIN/VOUT ratio. |
| Quiescent Current | 60µA active / <0.1µA shutdown - minimizes battery drain in always-on portable devices. |
| FB Reference Voltage | 1.235V ±15mV - precision internal reference used with external top resistor (e.g., 909kΩ for 16V output). |
| CTRL Pin Sensitivity | 20–100nA bias current, 6–14mV offset - enables accurate analog dimming via low-impedance voltage source. |
| Minimum Switching Frequency | ≥45kHz - ensures switching remains outside audible range under all operating conditions. |
Pinout & Package
LT3495BEDDB-1#TRMPBF is housed in a thermally enhanced 10-lead 3mm × 2mm plastic DFN package (DDB) with exposed pad (Pin 11) soldered to PCB ground for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1, 2) | Power and signal ground reference | Low-impedance return path for switch current and feedback amplifier; must connect directly to local ground plane. |
| VCC (Pin 3) | Main input supply input | Accepts 2.5–16V; requires local ceramic bypass capacitor (e.g., 4.7µF X5R) to suppress high-frequency ripple. |
| CTRL (Pin 4) | Auxiliary reference override input | Drives FB node to match applied voltage (0–1.235V); enables analog dimming without external DAC or PWM filtering. |
| SHDN (Pin 5) | Enable/disable control input | Logic-high (≥1.5V) enables operation; logic-low (≤0.3V) disables switch and activates PMOS disconnect. |
| FB (Pin 6) | Feedback sensing node | Monitors output via resistor divider; internal 76kΩ to GND simplifies design - only top resistor required. |
| VOUT (Pin 7) | PMOS drain output terminal | Delivers regulated output; connects to load when PMOS is on; floats to GND during shutdown for true isolation. |
| CAP (Pins 8, 9) | PMOS source and boost capacitor node | Connects to boost capacitor (e.g., 2.2µF) and inductor; carries full switch current; critical for EMI control. |
| SW (Pin 10) | Internal NPN switch collector | High di/dt node; requires minimal trace area and ground-plane shielding to reduce radiated emissions. |
| Exposed Pad (Pin 11) | Thermal and electrical ground | Must be soldered to PCB ground pour; provides primary thermal path and reduces θJA to 76°C/W. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated output disconnect | PMOS switch isolates VOUT from CAP during shutdown, enabling zero-load leakage and true system-level power gating. |
| Low-noise audio-band–free operation | Guaranteed ≥45kHz minimum switching frequency eliminates audible coil whine in portable audio/OLED applications. |
| CTRL-pin–based analog dimming | Direct voltage-controlled output regulation (0–1.235V on CTRL) enables smooth OLED brightness control without PWM artifacts. |
| Micropower shutdown mode | <0.1µA shutdown current extends battery life in standby; achieved via internal bias current cutoff and PMOS gate discharge. |
| Integrated 76kΩ feedback resistor | Reduces BOM count and layout sensitivity; only one external resistor (R1) needed to set output voltage per R1 = 76×(VOUT/1.235 – 1) kΩ. |
Applications
| OLED Display Power Supply | Portable Audio Device Power |
|---|---|
|
Use Scenario: Powering 3–5 series white OLED panels (requiring 12–20V) from a single 3.6V Li-ion cell in smartwatches or AR glasses. IC Role / Device Role / Timing Role: Boost converter with output disconnect and analog dimming control - regulates VOUT while enabling pixel-level brightness scaling via CTRL pin. Use Value: Eliminates need for external dimming DAC or PWM filter; 60µA quiescent current preserves battery runtime during display idle states. |
Use Scenario: Generating clean 15V bias for headphone amplifiers or MEMS microphones in Bluetooth earbuds. IC Role / Device Role / Timing Role: Low-EMI, low-ripple boost regulator with shutdown isolation - supplies analog audio circuitry without introducing switching noise into sensitive signal paths. Use Value: ≥45kHz fixed-minimum frequency avoids interference in 20Hz–20kHz audio band; integrated CAP/VOUT decoupling minimizes conducted noise. |
| MP3 Player Backlight Driver | Industrial Sensor Node Power |
|
Use Scenario: Driving white LED backlight (18V, 20mA) in portable media players using 3.3V system rail. IC Role / Device Role / Timing Role: Compact, low-noise DC-DC converter with soft-start and output disconnect - enables flicker-free backlight ramp-up and zero-power-off state. Use Value: CTRL pin allows seamless brightness transition between UI modes; 3mm × 2mm DFN saves space in ultra-thin form factors. |
Use Scenario: Providing stable 24V supply for piezoelectric sensors or RF front-end bias in battery-powered IoT nodes. IC Role / Device Role / Timing Role: High-voltage boost regulator with robust input range (2.5–16V) and thermal-safe shutdown - sustains operation across wide battery discharge curve. Use Value: 350mA switch limit balances output power capability with thermal safety in sealed enclosures; exposed-pad DFN aids passive cooling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3495EDDB-1#TRMPBF | Same 350mA switch limit and 45kHz min frequency, but rated for –40°C to 125°C junction temperature (vs. –40°C to 125°C for LT3495BEDDB-1#TRMPBF - identical spec; "B" suffix denotes same temp grade). | No functional difference; both qualified for automotive and industrial ambient environments. | Select LT3495EDDB-1#TRMPBF if requiring documented AEC-Q200 alignment or legacy part number continuity. |
| LT3495B-1#TRMPBF | Same pinout and 350mA switch limit, but disables minimum switching frequency enforcement - allows zero-frequency operation and eliminates minimum load requirement. | Suitable where ultra-low-light dimming or near-zero-load hold-up is required, but may introduce audible noise at light loads. | Choose LT3495B-1#TRMPBF only if audio-band noise is not a concern and load can drop below 1mA without regulation drift. |
Compared with LT3495EDDB-1#TRMPBF, LT3495BEDDB-1#TRMPBF offers identical performance and qualification; versus LT3495B-1#TRMPBF, it guarantees audio-band–free operation at the cost of requiring a minimum load under certain VIN/VOUT conditions - a trade-off favoring noise-sensitive portable displays.
Availability
LT3495BEDDB-1#TRMPBF is available at Aetrix Electronics and suitable for OLED display power, portable audio bias, MP3 player backlight, and industrial sensor node applications requiring stable component supply, long-term manufacturability, and guaranteed parametric consistency across production lots.
Supply support for LT3495BEDDB-1#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, serving industrial, automotive, communications, and consumer markets.
The LT3495 series was designed specifically for space-constrained, battery-powered applications demanding low-noise, high-efficiency boost conversion with true output isolation - targeting OLED, LED, and analog sensor power needs in wearables and portable electronics.
FAQ
What is the maximum output voltage supported by the LT3495BEDDB-1#TRMPBF?
The LT3495BEDDB-1#TRMPBF supports output voltages up to 40V, as confirmed by its absolute maximum SW and VOUT ratings. This enables driving multi-series OLED panels or high-voltage analog circuitry from low-input sources like single-cell Li-ion batteries. Operation at 40V requires careful attention to capacitor voltage derating and PCB creepage distances.
How does the CTRL pin function in the LT3495BEDDB-1#TRMPBF?
In the LT3495BEDDB-1#TRMPBF, the CTRL pin serves as an auxiliary reference input that overrides the internal 1.235V FB reference when driven between 0V and 1.235V. This allows real-time analog dimming of OLED or LED outputs without external DACs or PWM filters. The pin draws only 20–100nA, enabling high-impedance control sources.
Does the LT3495BEDDB-1#TRMPBF require an external feedback resistor?
Yes - the LT3495BEDDB-1#TRMPBF integrates a precise 76kΩ resistor from FB to GND, but requires one external top resistor (R1) to set output voltage. For example, a 909kΩ resistor yields ~16V output using R1 = 76 × (VOUT/1.235 – 1) kΩ. No second resistor is needed, reducing BOM count and layout complexity.
What is the purpose of the exposed pad on the LT3495BEDDB-1#TRMPBF DFN package?
The exposed pad (Pin 11) on the LT3495BEDDB-1#TRMPBF is electrically and thermally connected to GND. It must be soldered to a PCB ground pour to achieve specified thermal performance (θJA = 76°C/W) and ensure stable operation under sustained 350mA switch current. Omitting this connection risks thermal shutdown or parameter shift.
Can the LT3495BEDDB-1#TRMPBF drive loads directly from the VOUT pin?
Yes - the LT3495BEDDB-1#TRMPBF supports load connection to VOUT, where the integrated PMOS disconnect isolates the load from input during shutdown. However, VOUT voltage includes PMOS dropout (~150mV at 50mA), so feedback should be taken from VOUT (not CAP) to regulate final output accurately. Loads must sink current only; no external voltage sources may be applied to VOUT or CAP.
LT3495BEDDB-1#TRMPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Up, Step-Up/Step-Down
- Output Configuration:
- Positive
- Topology:
- Boost, SEPIC
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.5V
- Voltage - Input (Max):
- 16V
- Voltage - Output (Min/Fixed):
- 2.5V
- Voltage - Output (Max):
- 40V (Switch)
- Current - Output:
- 275mA (Switch)
- Frequency - Switching:
- -
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-DFN (3x2)
LT3495BEDDB-1#TRMPBF FAQ
1.How can I place an order for LT3495BEDDB-1#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3495BEDDB-1#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 LT3495BEDDB-1#TRMPBF reliable?
The price and inventory of LT3495BEDDB-1#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3495BEDDB-1#TRMPBF is usually 5 days.
3.What payment methods are accepted for LT3495BEDDB-1#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3495BEDDB-1#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3495BEDDB-1#TRMPBF?
LT3495BEDDB-1#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3495BEDDB-1#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 LT3495BEDDB-1#TRMPBF?
For technical support, including LT3495BEDDB-1#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3495BEDDB-1#TRMPBF requirements.
6.How does Aetrix verify that LT3495BEDDB-1#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LT3495BEDDB-1#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 LT3495BEDDB-1#TRMPBF meets industry standards.
7.What is the process for return or replacement of LT3495BEDDB-1#TRMPBF?
All LT3495BEDDB-1#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3495BEDDB-1#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 LT3495BEDDB-1#TRMPBF part is unused and in its original packaging.
Return procedure for LT3495BEDDB-1#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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