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Analog Devices Inc. LT3495EDDB-1#TRMPBF
- Part No.:
- LT3495EDDB-1#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LT3495EDDB-1#TRMPBF.pdf
- Description:
- IC REG BST SEPIC ADJ 275MA 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,683
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Product details
Overview
LT3495EDDB-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 output disconnect PMOS. It operates from 2.5V to 16V input, delivers up to 40V output, maintains switching frequency >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 LT3495EDDB-1#TRMPBF datasheet, LT3495EDDB-1#TRMPBF pinout, LT3495EDDB-1#TRMPBF application, or LT3495EDDB-1#TRMPBF equivalent, key selection criteria include its fixed 350mA switch current limit, guaranteed audio-band–free operation, integrated output disconnect, CTRL-pin–enabled dimming control, and 10-lead 3mm × 2mm DFN package with exposed thermal pad.
Technical Context
The LT3495EDDB-1#TRMPBF employs a variable peak inductor current and variable off-time control scheme that simultaneously regulates output voltage and suppresses audible noise by enforcing a minimum 45kHz switching frequency. Its internal 76kΩ feedback resistor and 1.235V reference enable precise output setting via a single external resistor.
It integrates a 350mA NPN power switch with 125mV typical VCE(SAT), a PMOS output disconnect switch with 150mV typical VCAP–VOUT drop at 50mA, and an auxiliary CTRL pin that overrides the internal reference down to 0V-supporting dynamic output voltage adjustment for display dimming 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 high-voltage OLED panels, white LEDs, or sensor bias supplies. |
| 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 - preserves battery life in always-on portable devices. |
| Minimum Switching Frequency | 45kHz - ensures no audible noise generation across full load range, critical for consumer audio-adjacent systems. |
| FB Reference Voltage | 1.235V ±15mV - precision internal reference enabling accurate output regulation with single-resistor feedback. |
| Package | 10-lead 3mm × 2mm DFN with exposed thermal pad - provides compact footprint and enhanced thermal performance for space-constrained designs. |
Pinout & Package
LT3495EDDB-1#TRMPBF is housed in a 10-lead plastic DFN (DDB) package measuring 3mm × 2mm, with an exposed thermal pad (Pin 11) that must be 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, feedback, and control logic; requires direct connection to local ground plane. |
| VCC (Pin 3) | Main input supply | Accepts 2.5–16V input; must be locally bypassed with ≥4.7µF ceramic capacitor to suppress switching transients. |
| CTRL (Pin 4) | Auxiliary reference input | Overrides internal 1.235V reference when driven below 1.235V; enables analog dimming or programmable output voltage without external DAC. |
| SHDN (Pin 5) | Enable/disable control | Logic-high (>1.5V) enables operation; grounded disables IC and activates output disconnect; draws <8µA bias current. |
| FB (Pin 6) | Feedback sensing node | Monitors output via resistive divider; internal 76kΩ bottom resistor simplifies design; trace length must be minimized to reduce noise coupling. |
| VOUT (Pin 7) | PMOS drain output | Delivers regulated output; connects to load when enabled; isolated from input during shutdown via integrated PMOS disconnect. |
| CAP (Pins 8, 9) | PMOS source / inductor return | Node where inductor and output capacitor connect; carries full switch current; requires low-ESR 2.2µF+ ceramic bypass. |
| SW (Pin 10) | Switch collector | Drives external inductor/diode; exhibits fast edges requiring minimal trace area and ground-plane shielding to limit EMI. |
| Exposed Pad (Pin 11) | Thermal and electrical ground | Must be soldered to PCB ground plane; critical for thermal dissipation and stable operation at full load. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Output Disconnect | PMOS switch isolates VOUT from CAP during shutdown, preventing backfeed and enabling true zero-load leakage (<0.1µA). |
| Low-Noise Control Architecture | Guaranteed >45kHz minimum switching frequency eliminates audible coil whine across all loads and input voltages. |
| CTRL-Pin Dimming Interface | Direct analog control of output voltage from 0V to 1.235V on CTRL pin enables seamless OLED brightness adjustment without added components. |
| Integrated Feedback Resistor | 76kΩ internal bottom resistor reduces BOM count and layout sensitivity-only one external top resistor required for output setting. |
| Micropower Operation | 60µA quiescent current extends battery runtime in always-on portable instrumentation and wearables. |
Applications
| OLED Display Power Supply | Portable Audio Device Bias Supply |
|---|---|
Use Scenario: Powering 12–20V OLED panels from a 3.6V Li-ion battery in smartwatches or AR glasses. IC Role / Device Role / Timing Role: Boost converter with output disconnect and analog dimming control. Use Value: Delivers stable 16V output with <50mV ripple, enables smooth brightness control via CTRL pin, and cuts standby current to <0.1µA during sleep mode. | Use Scenario: Generating clean 15V bias for MEMS microphones or Class-D amplifier gate drivers in Bluetooth earbuds. IC Role / Device Role / Timing Role: Low-noise, high-efficiency DC-DC boost stage with EMI-optimized layout support. Use Value: Maintains >80% efficiency at 10–70mA loads while suppressing switching noise that could modulate audio signals. |
| MP3 Player Backlight Driver | Industrial Sensor Excitation Supply |
Use Scenario: Driving white LED backlight strings requiring 18–24V from a 5V USB input in portable media players. IC Role / Device Role / Timing Role: Compact, thermally robust boost controller with soft-start and overcurrent protection. Use Value: Achieves 120mA max output at 20V using 10µH inductor; exposed pad ensures reliable operation at 125°C junction temperature. | Use Scenario: Providing stable 30V excitation for piezoresistive pressure sensors in battery-powered IoT nodes. IC Role / Device Role / Timing Role: Precision-regulated high-voltage supply with shutdown isolation and wide input tolerance. Use Value: Regulates output within ±1% over –40°C to 125°C; output disconnect prevents sensor self-discharge during MCU sleep cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3495EDDB#TRMPBF | 650mA switch current limit; same package and pinout; higher peak current enables greater output power at same VIN/VOUT. | Suitable for higher-current OLED panels or multi-LED strings where LT3495EDDB-1#TRMPBF's 350mA limit is insufficient. | Select when >100mA output current is required at 16–20V; verify inductor saturation rating supports 650mA peak. |
| LT3495B-1EDDB#TRMPBF | No minimum switching frequency constraint; allows zero-frequency operation in ultra-low-power modes; identical 350mA current limit. | Better suited for applications requiring lowest possible quiescent power under light/no load, such as energy-harvesting sensors. | Choose when minimizing no-load power loss is critical and audible noise is not a concern; note absence of 45kHz floor. |
Compared with LT3495EDDB#TRMPBF, the LT3495EDDB-1#TRMPBF trades peak current headroom for tighter thermal envelope and lower gate charge drive, while LT3495B-1EDDB#TRMPBF removes the audio-band guardband to achieve sub-µA effective idle current-making each variant optimal for distinct power/size/noise trade-offs.
Availability
LT3495EDDB-1#TRMPBF is available at Aetrix Electronics and suitable for OLED display power, portable audio bias, MP3 player backlighting, and industrial sensor excitation requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for LT3495EDDB-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 acquired Linear Technology in 2017 and maintains full technical and manufacturing continuity for the LT® product family, known for high-performance analog and power management ICs.
The LT3495 series was designed specifically for space-constrained, battery-powered applications demanding low noise, high efficiency, and integrated output isolation-particularly OLED, LED, and sensor bias supplies in portable electronics.
FAQ
What is the maximum output current capability of the LT3495EDDB-1#TRMPBF?
The LT3495EDDB-1#TRMPBF supports up to ~120mA at 5V output and ~12mA at 40V output when operating from a 3V input, based on its 350mA switch current limit, inductor value, and efficiency derating. Actual output current depends on input voltage, output voltage, inductor selection, and thermal conditions-designers should use the peak inductor current formula (IPK = 0.35A + VIN×200n/L) and apply 20% derating per the datasheet.
Does the LT3495EDDB-1#TRMPBF require an external feedback resistor?
Yes, the LT3495EDDB-1#TRMPBF requires one external top feedback resistor (R1) connected between VOUT and FB pins. Its internal 76kΩ bottom resistor and 1.235V reference simplify design: R1 = 76kΩ × (VOUT/1.235 − 1). For example, a 16V output requires R1 ≈ 909kΩ. The CTRL pin can override this setting for dynamic adjustment.
How does the output disconnect function work in the LT3495EDDB-1#TRMPBF?
In the LT3495EDDB-1#TRMPBF, output disconnect is implemented via an integrated PMOS switch between CAP and VOUT pins. When SHDN is pulled low, the PMOS turns off, isolating VOUT from the boost circuit and reducing leakage to <0.1µA. During operation, the PMOS remains on with <150mV drop at 50mA-ensuring minimal conduction loss while enabling true load isolation during shutdown.
Can the LT3495EDDB-1#TRMPBF operate with input voltages below 2.5V?
No-the absolute minimum operating voltage for the LT3495EDDB-1#TRMPBF is 2.5V as specified in the Absolute Maximum Ratings and Electrical Characteristics tables. Operation below 2.5V may result in failure to start, unstable regulation, or undefined behavior. For sub-2.5V inputs, consider alternative boost converters such as the LTC3526L or MAX1722, which support 0.8V startup.
What layout practices are critical for stable operation of the LT3495EDDB-1#TRMPBF?
Stable operation of the LT3495EDDB-1#TRMPBF requires short, low-inductance SW and FB traces; grounding the exposed pad directly to a solid ground plane; placing input (≥4.7µF) and CAP (≥2.2µF) capacitors adjacent to their respective pins; and routing the feedback resistor R1 directly from VOUT to FB with minimal loop area. Avoid routing noisy signals near FB or SW, and use vias to ground plane under the exposed pad for thermal reliability.
LT3495EDDB-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)
LT3495EDDB-1#TRMPBF FAQ
1.How can I place an order for LT3495EDDB-1#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3495EDDB-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 LT3495EDDB-1#TRMPBF reliable?
The price and inventory of LT3495EDDB-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 LT3495EDDB-1#TRMPBF is usually 5 days.
3.What payment methods are accepted for LT3495EDDB-1#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3495EDDB-1#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3495EDDB-1#TRMPBF?
LT3495EDDB-1#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3495EDDB-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 LT3495EDDB-1#TRMPBF?
For technical support, including LT3495EDDB-1#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3495EDDB-1#TRMPBF requirements.
6.How does Aetrix verify that LT3495EDDB-1#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LT3495EDDB-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 LT3495EDDB-1#TRMPBF meets industry standards.
7.What is the process for return or replacement of LT3495EDDB-1#TRMPBF?
All LT3495EDDB-1#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3495EDDB-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 LT3495EDDB-1#TRMPBF part is unused and in its original packaging.
Return procedure for LT3495EDDB-1#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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