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Analog Devices Inc. LT3495BEDDB#TRPBF
- Part No.:
- LT3495BEDDB#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LT3495BEDDB#TRPBF.pdf
- Description:
- IC REG BST SEPIC ADJ 550MA 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,558
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Product details
Overview
LT3495BEDDB#TRPBF from Analog Devices (formerly Linear Technology) is a micropower, low-noise boost converter IC with integrated 650mA 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 achieves 60µA quiescent current in active mode. It is used in OLED display power supplies from single Li-ion cells.
For engineers reviewing the LT3495BEDDB#TRPBF datasheet, LT3495BEDDB#TRPBF pinout, LT3495BEDDB#TRPBF application, or LT3495BEDDB#TRPBF equivalent, key selection criteria include its fixed minimum switching frequency (≥45kHz), integrated output disconnect, CTRL-pin-based output voltage dimming, and 10-lead 3mm × 2mm DFN package with exposed thermal pad.
Technical Context
The LT3495BEDDB#TRPBF implements a variable peak-current, variable off-time control architecture that simultaneously regulates output voltage and suppresses audible noise by enforcing a minimum 45kHz switching frequency - unlike the LT3495B/B-1 variants which allow zero-frequency operation. Its internal 76kΩ feedback resistor and 1.235V reference enable precise output setting via a single external top resistor.
It integrates an NPN power switch (650mA current limit), a PMOS output disconnect switch (with 250–450mA current limiting and 8.7V VCAP–VVOUT clamp), and a low-bias CTRL pin (20–100nA) for real-time output voltage override down to near-input levels - enabling dynamic 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 Li-ion (3.0–4.2V), 5V rails, and industrial 12V inputs without pre-regulation. |
| Output Voltage Range | Up to 40V - enables driving high-voltage OLED panels, white LED strings, or analog sensor bias rails from low-voltage sources. |
| Switch Current Limit | 650mA typical - sets maximum energy transfer per cycle; determines achievable output power with given inductor and input/output voltages. |
| Quiescent Current | 60µA active / <0.1µA shutdown - preserves battery life in always-on portable devices and enables microamp-level system sleep modes. |
| Minimum Switching Frequency | 45kHz (guaranteed) - ensures all switching harmonics remain above audible range (20kHz), eliminating coil whine in audio-sensitive applications. |
| FB Reference Voltage | 1.235V ±15mV - precision internal reference enabling accurate output regulation; used with external R1 to set VOUT = 1.235 × (1 + R1/76kΩ). |
| Package | 10-lead 3mm × 2mm DFN with exposed thermal pad (Pin 11 = GND) - provides low thermal resistance (θJA = 76°C/W) for compact, thermally constrained layouts. |
Pinout & Package
LT3495BEDDB#TRPBF is housed in a 10-lead plastic DFN package (3mm × 2mm, DDB), with Pin 11 as an exposed thermal pad electrically connected to GND and requiring PCB soldering 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; 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 minimize ripple and EMI. |
| CTRL (Pin 4) | Auxiliary reference input | Overrides internal 1.235V FB reference when driven below 1.235V; enables analog dimming of VOUT during operation with <100nA bias current. |
| SHDN (Pin 5) | Enable/disable control input | Logic-high (≥1.5V) enables operation; logic-low (≤0.3V) places device in ultra-low-power shutdown (<0.1µA IQ) and activates output disconnect. |
| FB (Pin 6) | Feedback sensing node | Monitors divided output voltage; internal 76kΩ resistor to GND forms bottom leg of divider; trace must be short and shielded to avoid noise coupling. |
| VOUT (Pin 7) | PMOS drain output node | Delivers regulated output after disconnect switch; connects to load when enabled; floats to GND during shutdown due to PMOS turn-off. |
| CAP (Pins 8, 9) | PMOS source / inductor return node | Carries full switched inductor current; requires low-ESR ceramic capacitor (e.g., 2.2µF) to filter ripple; not safe to short to GND during shutdown if VCAP > VVOUT + 8.7V. |
| SW (Pin 10) | NPN collector switching node | Connects to inductor and Schottky diode anode; carries high dv/dt; trace must be short, wide, and over solid ground plane to minimize EMI. |
| Exposed Pad (Pin 11) | Thermal and electrical ground | Must be soldered to PCB copper area ≥10mm² for thermal dissipation and low-inductance GND connection; electrically tied to Pins 1 & 2. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated output disconnect PMOS | Isolates VOUT from input during shutdown, allowing load to fully discharge to GND - critical for OLED pixel reset and safety-critical power sequencing. |
| CTRL-pin voltage dimming | Enables continuous, noise-free analog adjustment of output voltage from ~VIN up to full regulated value using only a low-current DAC or potentiometer - no external op-amps required. |
| Fixed minimum 45kHz switching | Guarantees all operating conditions stay outside audible band, eliminating coil whine in portable audio devices, medical monitors, and quiet-environment instrumentation. |
| 60µA quiescent current | Supports multi-year battery life in coin-cell-powered IoT sensors and wearable displays where standby current dominates total energy budget. |
| Internal 76kΩ feedback resistor | Reduces BOM count and layout area by eliminating one external component; ensures matched temperature drift between internal reference and feedback network. |
Applications
| OLED Display Power Supply | Portable Audio Device Bias Rail |
|---|---|
|
Use Scenario: Powering RGB OLED panels in smartwatches and AR glasses from a single 3.6V Li-ion cell. IC Role / Device Role / Timing Role: Boost converter generating stable 12–18V VDD and VSS rails with fast transient response to pixel refresh demands. Use Value: Integrated output disconnect prevents ghosting during screen blanking; CTRL dimming enables seamless brightness control without PWM flicker. |
Use Scenario: Providing clean, low-noise 24V bias for MEMS microphones and Class-D amplifier gate drivers in Bluetooth earbuds. IC Role / Device Role / Timing Role: Low-ripple, high-PF boost stage delivering regulated high-side voltage independent of battery sag. Use Value: 45kHz minimum frequency avoids interference with 20Hz–20kHz audio band; 60µA IQ extends playback time between charges. |
| MP3 Player Backlight Driver | Industrial Sensor Signal Conditioning |
|
Use Scenario: Driving white LED backlight arrays in handheld media players with adjustable intensity. IC Role / Device Role / Timing Role: Constant-voltage source with analog dimming interface, replacing inefficient linear regulators and discrete FET solutions. Use Value: CTRL pin allows direct connection to microcontroller DAC output for smooth, stepless brightness control without added components. |
Use Scenario: Generating precise ±15V or +24V rails for op-amp front-ends and ADC reference buffers in battery-operated data loggers. IC Role / Device Role / Timing Role: Micropower DC/DC converter maintaining rail stability during deep-sleep wake-up cycles. Use Value: <0.1µA shutdown current minimizes self-discharge; internal feedback resistor improves long-term accuracy over temperature. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3495EDDB#TRPBF | Same 650mA switch, 45kHz min frequency, but rated for –40°C to 125°C junction (vs. LT3495BEDDB#TRPBF's extended –40°C to 125°C ambient with same junction limit). | No functional difference in circuit design; identical pinout and electrical specs; differs only in screening/test grade. | Select LT3495EDDB#TRPBF for applications requiring full automotive AEC-Q200 qualification or extended reliability validation. |
| LT3495B-1EDDB#TRPBF | 350mA switch current limit, zero-minimum-frequency operation, no mandatory minimum load - optimized for ultra-low-power, low-output-current use cases. | Lower max output current and relaxed frequency constraints reduce efficiency at medium loads but eliminate need for minimum load resistors. | Choose LT3495B-1EDDB#TRPBF when powering sub-20mA loads (e.g., RF bias, low-current sensors) where lowest possible IQ and no-load stability are prioritized over peak power. |
Compared with LT3495EDDB#TRPBF, the LT3495BEDDB#TRPBF offers identical performance but with enhanced manufacturing traceability for industrial OEMs; versus LT3495B-1EDDB#TRPBF, it delivers 86% higher peak current and guaranteed audio-band immunity - making it optimal for OLED and audio-bias applications demanding both power and silence.
Availability
LT3495BEDDB#TRPBF is available at Aetrix Electronics and suitable for OLED display power, portable audio bias rails, and MP3 player backlighting requiring stable component supply, long-lifecycle support, and consistent parametric performance across production batches.
Supply support for LT3495BEDDB#TRPBF 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 DC/DC conversion in space-constrained portable electronics - emphasizing ultra-low quiescent current, integrated output disconnect, and silent operation for displays and audio systems.
FAQ
What is the minimum input voltage required for LT3495BEDDB#TRPBF to regulate a 16V output?
The LT3495BEDDB#TRPBF requires a minimum input voltage of 2.5V to initiate and sustain regulation. For a 16V output, practical operation begins at ~2.8V input under light load, but full 650mA switch current capability requires ≥3.0V input to ensure sufficient headroom for duty cycle and efficiency. Below 2.5V, the part may not start or will drop out of regulation.
Does LT3495BEDDB#TRPBF require an external feedback resistor to set output voltage?
Yes, the LT3495BEDDB#TRPBF requires one external top feedback resistor (R1) connected between VOUT and FB. The internal 76kΩ resistor forms the bottom leg of the divider. To achieve a target VOUT, calculate R1 = 76kΩ × (VOUT/1.235 − 1); for example, 16V output requires R1 ≈ 909kΩ. No second resistor is needed.
Can LT3495BEDDB#TRPBF drive a load directly from the CAP pin instead of VOUT?
Yes - connecting the load to the CAP pin bypasses the output disconnect PMOS, eliminating its conduction loss and improving efficiency. However, during shutdown, CAP remains at ~VCC − 0.3V (not GND), so this configuration is only suitable when the load can tolerate that residual voltage. The feedback resistor must still connect to VOUT to maintain regulation accuracy.
What is the purpose of the CTRL pin on LT3495BEDDB#TRPBF, and how is it used?
The CTRL pin on LT3495BEDDB#TRPBF overrides the internal 1.235V feedback reference: when driven between 0V and 1.235V, it forces the FB pin to track CTRL voltage, thereby lowering VOUT proportionally. This enables analog dimming of OLED displays or dynamic adjustment of bias rails without external DACs or PWM filtering - with only 20–100nA pin bias current.
How does LT3495BEDDB#TRPBF ensure low-noise operation in sensitive audio applications?
The LT3495BEDDB#TRPBF guarantees a minimum switching frequency of 45kHz - well above the 20kHz human audio range - preventing audible coil whine. Combined with its low-noise control scheme, integrated output disconnect (to eliminate shutdown transients), and low 60µA quiescent current, it delivers clean, silent power ideal for microphone bias, headphone amplifiers, and audio codec supplies.
LT3495BEDDB#TRPBF 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#TRPBF FAQ
1.How can I place an order for LT3495BEDDB#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3495BEDDB#TRPBF 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#TRPBF reliable?
The price and inventory of LT3495BEDDB#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3495BEDDB#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3495BEDDB#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3495BEDDB#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3495BEDDB#TRPBF?
LT3495BEDDB#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3495BEDDB#TRPBF 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#TRPBF?
For technical support, including LT3495BEDDB#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3495BEDDB#TRPBF requirements.
6.How does Aetrix verify that LT3495BEDDB#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3495BEDDB#TRPBF 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#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3495BEDDB#TRPBF?
All LT3495BEDDB#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3495BEDDB#TRPBF, 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#TRPBF part is unused and in its original packaging.
Return procedure for LT3495BEDDB#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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