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Analog Devices Inc. LT3495BEDDB#TRMPBF
- Part No.:
- LT3495BEDDB#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LT3495BEDDB#TRMPBF.pdf
- Description:
- IC REG BST SEPIC ADJ 550MA 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:7,312
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Product details
Overview
LT3495BEDDB#TRMPBF from Analog Devices (formerly Linear Technology) is a micropower, low-noise boost converter IC with integrated 650mA NPN power switch, internal feedback resistor (76kΩ), 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 LT3495BEDDB#TRMPBF datasheet, LT3495BEDDB#TRMPBF pinout, LT3495BEDDB#TRMPBF application, or LT3495BEDDB#TRMPBF equivalent, key selection criteria include its fixed minimum switching frequency (≥45kHz), integrated output disconnect, CTRL-pin-based dimming control, and DFN-10 (3mm × 2mm) package with exposed thermal pad.
Technical Context
The LT3495BEDDB#TRMPBF employs a variable peak-current, variable off-time control architecture that simultaneously regulates inductor current and switch off-time to minimize output voltage ripple while sustaining high efficiency (up to 85% at 70mA) over wide load ranges. Its fixed maximum switch-off time (17–35µs) ensures switching frequency remains above the audio band (≥45kHz) under all operating conditions.
It integrates a precision 1.235V internal reference, an auxiliary CTRL pin for dynamic output voltage adjustment (0.3V–1.235V), and a PMOS-based output disconnect circuit that isolates VOUT from CAP during shutdown - critical for leakage-sensitive portable displays. The device uses an internal 76kΩ bottom feedback resistor and supports external top-resistor programming for output voltages up to 40V.
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) or multi-cell battery stacks without pre-regulation. |
| Output Voltage Range | Up to 40V - enables driving high-voltage OLED panels or white LED strings from low-input sources. |
| Switch Current Limit | 650mA typical - sets maximum energy transfer per cycle; determines peak inductor current and max output power capability. |
| Quiescent Current | 60µA active / <0.1µA shutdown - extends battery life in always-on display bias applications. |
| Minimum Switching Frequency | ≥45kHz - prevents audible noise in sensitive audio-adjacent systems and simplifies EMI filtering. |
| FB Reference Voltage | 1.235V ±15mV - defines regulation point; used with external top resistor (e.g., 909kΩ for 16V output) to set VOUT. |
| Package | 10-lead 3mm × 2mm DFN with exposed thermal pad - provides compact footprint and enhanced thermal performance for space-constrained PCBs. |
Pinout & Package
LT3495BEDDB#TRMPBF is housed in a 10-lead plastic DFN package (3mm × 2mm) with exposed thermal pad (Pin 11), which 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 internal circuits and external components; tie directly to local ground plane. |
| VCC (Pin 3) | Main input supply connection | Accepts 2.5–16V; requires local ceramic bypass capacitor (e.g., 4.7µF) to suppress switching transients. |
| CTRL (Pin 4) | Auxiliary reference input | Overrides internal 1.235V FB reference when driven below 1.235V; enables analog dimming of output voltage during operation. |
| SHDN (Pin 5) | Enable/disable control input | Logic-high (≥1.5V) enables regulator; logic-low (≤0.3V) disables it and activates output disconnect. |
| FB (Pin 6) | Feedback sensing node | Monitors output via resistive divider; internal 76kΩ resistor to GND simplifies design; trace must be short and shielded from noise. |
| VOUT (Pin 7) | PMOS drain output terminal | Delivers regulated output; connects to load when enabled; floats to GND during shutdown due to PMOS disconnect. |
| CAP (Pins 8, 9) | PMOS source and boost capacitor node | Connects to boost capacitor (e.g., 2.2µF); also serves as alternative feedback point (with ~150mV drop vs. VOUT). |
| SW (Pin 10) | Internal NPN switch collector | High dv/dt node; drives external inductor/diode; requires minimal trace area and ground-plane shielding to reduce EMI. |
| Exposed Pad (Pin 11) | Thermal and electrical ground | Must be soldered to PCB ground plane; essential for thermal dissipation and stable operation at full load. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated output disconnect PMOS | Isolates VOUT from CAP during shutdown, eliminating standby leakage - critical for battery-powered OLED bias rails. |
| CTRL-pin dimming interface | Enables real-time analog adjustment of output voltage (down to near VIN level) without external DAC or controller. |
| Fixed minimum switching frequency | Guarantees ≥45kHz operation across full load range, avoiding audible noise and easing compliance with Class B EMI limits. |
| Low-noise variable off-time control | Reduces output voltage ripple to <50mV peak-to-peak at 70mA load - improves display contrast stability and reduces post-regulation filtering. |
| Internal 76kΩ feedback resistor | Eliminates one external component; simplifies BOM and layout while maintaining tight regulation accuracy (±1.2% FB voltage). |
Applications
| OLED Display Power Supply | Portable Audio Device Bias Rail |
|---|---|
|
Use Scenario: Powering monochrome or color OLED displays in wearables and handheld devices from a single 3.6V Li-ion cell. IC Role / Device Role / Timing Role: Boost converter generating stable 12–16V bias rail with ultra-low quiescent current and no audible switching noise. Use Value: Enables >100-hour battery life in always-on display mode while maintaining consistent brightness and contrast via CTRL-pin dimming. |
Use Scenario: Providing clean, low-noise high-voltage bias for headphone amplifiers or MEMS microphone preamps in MP3 players. IC Role / Device Role / Timing Role: Low-ripple DC-DC converter delivering 15–20V output with minimal conducted EMI into adjacent analog audio paths. Use Value: Prevents audible "whine" in headphones by enforcing ≥45kHz switching and reducing output ripple to sub-50mV levels. |
| Medical Sensor Excitation Supply | Industrial Low-Power Analog Front-End |
|
Use Scenario: Generating precise excitation voltage for piezoresistive pressure sensors or photodiode TIA bias in battery-operated medical monitors. IC Role / Device Role / Timing Role: Micropower boost regulator with shutdown-controlled output isolation to eliminate sensor leakage paths during sleep cycles. Use Value: Ensures nanoscale leakage current (<1µA) during standby, preserving sensor calibration and extending device runtime between charges. |
Use Scenario: Supplying isolated 5–10V rails for precision ADC references or op-amp biasing in low-power industrial IoT nodes. IC Role / Device Role / Timing Role: Compact, thermally robust DC-DC solution with DFN-10 package and exposed pad for reliable operation in confined enclosures. Use Value: Delivers stable output with <0.5% load regulation and integrated thermal protection - reducing need for external supervision circuitry. |
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 | Same 650mA switch limit and ≥45kHz min frequency, but rated for –40°C to 125°C junction temperature (vs. LT3495BEDDB#TRMPBF's extended –40°C to 125°C industrial grade). | Identical functional behavior; differs only in screening/test grade - suitable where extended temp validation is not required. | Select LT3495EDDB#TRMPBF for cost-sensitive consumer designs where full industrial qualification is unnecessary. |
| LT3495B-1EDDB#TRMPBF | 350mA switch limit and no minimum frequency constraint (switching can halt at zero Hz), resulting in lower peak power but relaxed load requirements. | Lacks guaranteed audio-band avoidance; better suited for non-audio applications where ultra-low idle power outweighs noise concerns. | Choose LT3495B-1EDDB#TRMPBF only when output load is highly variable or intermittent, and audible noise is not a system-level concern. |
Compared with LT3495EDDB#TRMPBF, LT3495BEDDB#TRMPBF offers identical electrical performance with enhanced process consistency for industrial environments; versus LT3495B-1EDDB#TRMPBF, it trades lower peak current for deterministic high-frequency operation - making it preferable for noise-sensitive, continuously loaded OLED systems.
Availability
LT3495BEDDB#TRMPBF is available at Aetrix Electronics and suitable for OLED display power, portable audio bias rails, medical sensor excitation, and industrial analog front-end designs requiring stable component supply, long-term lifecycle support, and guaranteed industrial-grade screening.
Supply support for LT3495BEDDB#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 healthcare markets.
The LT3495 series was designed specifically for micropower, low-noise boost conversion in portable display and sensor applications - emphasizing ultra-low quiescent current, integrated output disconnect, and deterministic high-frequency operation to eliminate audible artifacts.
FAQ
What is the minimum input voltage required for LT3495BEDDB#TRMPBF to regulate a 16V output?
The LT3495BEDDB#TRMPBF specifies a minimum operating voltage of 2.5V. For reliable 16V output regulation, input must remain ≥2.5V under worst-case load and temperature conditions. At 3.6V nominal Li-ion voltage, the device achieves >80% efficiency at 70mA load - confirming stable operation well within specification.
Does LT3495BEDDB#TRMPBF require an external feedback resistor?
Yes - LT3495BEDDB#TRMPBF includes an internal 76kΩ bottom feedback resistor but requires an external top resistor (R1) connected between VOUT and FB to set output voltage. For example, a 909kΩ resistor yields ~16V output using the formula R1 = 76kΩ × (VOUT/1.235 − 1).
How does the CTRL pin function in LT3495BEDDB#TRMPBF?
The CTRL pin on LT3495BEDDB#TRMPBF overrides the internal 1.235V feedback reference when driven below 1.235V. This allows real-time analog dimming of the output voltage - e.g., lowering VOUT from 16V to 8V by applying 0.6V to CTRL - without changing external resistors or adding digital control.
Can LT3495BEDDB#TRMPBF drive loads directly from the VOUT pin?
Yes - LT3495BEDDB#TRMPBF supports load connection to VOUT, leveraging its integrated PMOS disconnect to isolate the load from input during shutdown. However, this introduces ~150mV dropout at 50mA due to PMOS RDS(on); for higher efficiency, connect load to CAP and feedback to VOUT.
What thermal considerations apply to LT3495BEDDB#TRMPBF's exposed pad?
The exposed pad (Pin 11) of LT3495BEDDB#TRMPBF is electrically and thermally connected to GND and must be soldered to a PCB ground plane with ≥4 thermal vias. This reduces θJA to 76°C/W, enabling continuous 650mA switch operation at ambient temperatures up to 85°C without derating.
LT3495BEDDB#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:
- 550mA (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#TRMPBF FAQ
1.How can I place an order for LT3495BEDDB#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3495BEDDB#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#TRMPBF reliable?
The price and inventory of LT3495BEDDB#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#TRMPBF is usually 5 days.
3.What payment methods are accepted for LT3495BEDDB#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3495BEDDB#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3495BEDDB#TRMPBF?
LT3495BEDDB#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3495BEDDB#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#TRMPBF?
For technical support, including LT3495BEDDB#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3495BEDDB#TRMPBF requirements.
6.How does Aetrix verify that LT3495BEDDB#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LT3495BEDDB#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#TRMPBF meets industry standards.
7.What is the process for return or replacement of LT3495BEDDB#TRMPBF?
All LT3495BEDDB#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3495BEDDB#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#TRMPBF part is unused and in its original packaging.
Return procedure for LT3495BEDDB#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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