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Analog Devices Inc. LT3495EDDB#TRMPBF
- Part No.:
- LT3495EDDB#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LT3495EDDB#TRMPBF.pdf
- Description:
- IC REG BST SEPIC ADJ 550MA 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,517
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Product details
Overview
LT3495EDDB#TRMPBF 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 draws only 60µA quiescent current - enabling efficient OLED power supply from a single Li-ion cell.
For engineers reviewing the LT3495EDDB#TRMPBF datasheet, LT3495EDDB#TRMPBF pinout, LT3495EDDB#TRMPBF application, or LT3495EDDB#TRMPBF equivalent, key selection criteria include its fixed minimum switching frequency (prevents audible noise), integrated output disconnect for true shutdown isolation, CTRL-pin-based analog dimming capability, and 10-lead 3mm × 2mm DFN package with exposed thermal pad.
Technical Context
The LT3495EDDB#TRMPBF employs a variable peak-current, variable off-time control architecture that dynamically adjusts both inductor peak current and switch off-time to maintain regulation while minimizing output voltage ripple and maximizing efficiency across wide load ranges. Its fixed maximum off-time (≤35µs) ensures minimum switching frequency stays above 45kHz under all operating conditions.
This variant belongs to the LT3495/LT3495B family and specifically implements the LT3495 configuration: 650mA switch current limit, guaranteed minimum switching frequency, and requirement for minimum output load under certain VIN–VOUT conditions. It integrates a precision 1.235V reference, 76kΩ internal bottom feedback resistor, and auxiliary CTRL pin for real-time output voltage override down to near-VIN level.
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 supplies without pre-regulation. |
| Output Voltage Range | Up to 40V - enables driving high-voltage OLED displays, white LED strings, or sensor bias networks from low-input sources. |
| Switch Current Limit | 650mA typical - sets maximum energy transfer per cycle; determines inductor sizing and peak load capability (e.g., ~74mA at 15V out from 3.6V in). |
| Quiescent Current | 60µA active / <0.1µA shutdown - preserves battery life in always-on portable devices and enables microamp-level system standby. |
| Minimum Switching Frequency | ≥45kHz - avoids audible noise in sensitive audio/display applications and simplifies EMI filtering design. |
| FB Reference Voltage | 1.235V ±15mV - high-accuracy internal reference enables stable output regulation; used with external top resistor (e.g., 909kΩ for 16V). |
| Package | 10-lead 3mm × 2mm DFN with exposed thermal pad (Pin 11 = GND) - provides compact footprint and enhanced thermal performance for space-constrained PCBs. |
Pinout & Package
LT3495EDDB#TRMPBF is housed in a 10-lead plastic DFN package (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 internal circuits and external components; tie directly to local ground plane. |
| VCC (Pin 3) | Main input supply connection | Accepts 2.5–16V input; 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 or programmable output voltage control. |
| SHDN (Pin 5) | Enable/shutdown control | Logic-high (≥1.5V) enables operation; logic-low (≤0.3V) disables switching and activates output disconnect PMOS. |
| FB (Pin 6) | Feedback node input | Senses output voltage via resistor divider; internal 76kΩ pull-down enables single-resistor programming (R1 = 76k × (VOUT/1.235 − 1)). |
| VOUT (Pin 7) | PMOS drain output node | 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); carries full inductor current; must be bypassed locally to minimize ripple. |
| SW (Pin 10) | Internal NPN switch collector | High-frequency switching node; requires minimal trace area and ground-plane shielding to reduce EMI and switching losses. |
| Exposed Pad (Pin 11) | Thermal and electrical ground | Must be soldered to PCB ground plane; critical for thermal dissipation and noise immunity; electrically connected to Pins 1 & 2. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Output Disconnect PMOS | Isolates VOUT from CAP during shutdown, allowing load to fully discharge to GND - essential for display blanking and system-level power sequencing. |
| Low-Noise Control Scheme | Maintains ≥45kHz minimum switching frequency across full load range, eliminating audible coil whine and easing compliance with Class B EMI limits. |
| CTRL-Pin Analog Dimming | Enables continuous, glitch-free output voltage adjustment from max (set by R1) down to near-VIN level - ideal for OLED brightness control without PWM artifacts. |
| Ultra-Low Quiescent Current | 60µA active mode current extends battery runtime in portable medical, wearables, and IoT edge sensors requiring long-term operation. |
| Integrated Feedback Resistor | 76kΩ internal bottom resistor reduces BOM count and layout sensitivity; enables single-top-resistor output programming with predictable accuracy. |
Applications
| OLED Display Power Supply | Portable Audio Device Bias |
|---|---|
|
Use Scenario: Powering monochrome or color OLED panels (e.g., 12–16V anode bias) from a single 3.6V Li-ion cell in smartwatches or handheld test equipment. IC Role / Device Role / Timing Role: Primary boost regulator with output disconnect for panel on/off control and CTRL-driven dimming. Use Value: Eliminates need for external PMOS switch and dimming DAC; achieves <1mVpp ripple at 70mA load for flicker-free display operation. |
Use Scenario: Generating clean, adjustable high-voltage bias (e.g., 15–25V) for MEMS microphones or Class AB headphone amplifiers in MP3 players. IC Role / Device Role / Timing Role: Low-noise, micropower DC-DC converter providing stable analog supply independent of battery voltage sag. Use Value: 60µA quiescent current prevents battery drain during pause modes; ≥45kHz operation avoids interference with audio band signals. |
| Industrial Sensor Excitation | Low-Power RF Module Supply |
|
Use Scenario: Supplying precise 5–20V excitation voltage to strain gauges, RTDs, or piezoelectric sensors in battery-powered condition monitoring nodes. IC Role / Device Role / Timing Role: Programmable, isolated boost source with shutdown-controlled output disable for sensor power gating. Use Value: Integrated disconnect prevents sensor leakage paths during sleep; CTRL pin allows dynamic range adaptation without firmware changes. |
Use Scenario: Delivering regulated 3.3V or 5V to sub-GHz RF transceivers (e.g., TI CC1310) from partially discharged batteries in wireless sensor networks. IC Role / Device Role / Timing Role: Efficient, compact boost stage preceding LDO to maintain RF PA linearity across 2.5–4.2V battery range. Use Value: 10-lead DFN footprint saves board space vs discrete solutions; 650mA switch supports burst-mode TX current peaks up to 400mA. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3495BEDDB#TRMPBF | Same package and pinout; LT3495B variant with disabled minimum frequency control (0kHz min) and no mandatory minimum load. | Better suited for ultra-low-power applications where output voltage drift at light loads is unacceptable and variable-frequency operation is acceptable. | Select LT3495BEDDB#TRMPBF if audible noise is not a concern and zero-load stability is required; otherwise, LT3495EDDB#TRMPBF is preferred for noise-sensitive displays. |
| LT3495-1EDDB#TRMPBF | Same package and pinout; reduced 350mA switch current limit and identical ≥45kHz minimum frequency. | Lower output current capability (~36mA at 15V out from 3.6V in) but improved thermal margin in constrained layouts. | Choose LT3495-1EDDB#TRMPBF for lower-power OLEDs or space-limited designs where 650mA headroom is unnecessary and thermal derating is critical. |
Compared with LT3495BEDDB#TRMPBF, LT3495EDDB#TRMPBF guarantees minimum frequency for noise immunity but requires attention to light-load stability; compared with LT3495-1EDDB#TRMPBF, it delivers nearly double output current at same voltage, making it optimal for higher-brightness displays without increasing board area.
Availability
LT3495EDDB#TRMPBF is available at Aetrix Electronics and suitable for OLED display power, portable audio bias, industrial sensor excitation, and low-power RF module supply requiring stable component supply, lead-free compliance, and extended temperature operation (–40°C to 125°C).
Supply support for LT3495EDDB#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 and battery-critical applications - emphasizing ultra-low quiescent current, integrated output disconnect, and robust EMI performance in miniature DFN packages.
FAQ
What is the minimum input voltage required for LT3495EDDB#TRMPBF to regulate a 16V output?
The LT3495EDDB#TRMPBF specifies a minimum operating voltage of 2.5V, but practical regulation of 16V output requires sufficient headroom for the boost ratio and switch saturation. With a typical VCESAT of 200mV at 400mA, LT3495EDDB#TRMPBF can reliably start and regulate 16V output from ≥2.8V input under nominal load. Below 2.5V, startup may fail or regulation degrade.
How does the CTRL pin function in LT3495EDDB#TRMPBF, and what voltage range is valid?
The CTRL pin on LT3495EDDB#TRMPBF overrides the internal 1.235V feedback reference when driven between 0V and 1.235V, causing the FB pin to servo to the CTRL voltage. Driving CTRL ≥1.5V disables override and uses the internal reference. Valid CTRL input is 0–10V per absolute max ratings, but functional dimming occurs only below 1.235V.
Does LT3495EDDB#TRMPBF require an external Schottky diode, and what are key selection criteria?
Yes, LT3495EDDB#TRMPBF requires an external Schottky diode (e.g., Diodes Inc. B0540WS-7) in the boost path. Key criteria include 40V+ reverse breakdown, ≤0.4V forward drop at peak inductor current, and average current rating ≥1.2× expected load. Low capacitance and fast recovery minimize switching losses and EMI.
What is the purpose of the dual CAP pins (8 and 9) on LT3495EDDB#TRMPBF, and how should they be routed?
Pins 8 and 9 on LT3495EDDB#TRMPBF are internally connected to the source of the output disconnect PMOS and carry full inductor current. They must be tied together externally and connected to a low-ESR ceramic capacitor (e.g., 2.2µF X5R) placed as close as possible to the pins. Routing should use wide, short traces directly to the capacitor pad and then to ground via multiple vias to minimize AC impedance and ripple.
Can LT3495EDDB#TRMPBF drive a load directly from the VOUT pin while maintaining output disconnect functionality?
Yes - connecting the load to VOUT (rather than CAP) enables full output disconnect during shutdown: when SHDN is low, the internal PMOS turns off and VOUT discharges to GND through the load. However, this configuration incurs PMOS conduction loss (VDS ≈ 150mV at 50mA), reducing efficiency versus CAP-node loading. For maximum efficiency with disconnect, use VOUT for feedback and CAP for load.
LT3495EDDB#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)
LT3495EDDB#TRMPBF FAQ
1.How can I place an order for LT3495EDDB#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3495EDDB#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#TRMPBF reliable?
The price and inventory of LT3495EDDB#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#TRMPBF is usually 5 days.
3.What payment methods are accepted for LT3495EDDB#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3495EDDB#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3495EDDB#TRMPBF?
LT3495EDDB#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3495EDDB#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#TRMPBF?
For technical support, including LT3495EDDB#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3495EDDB#TRMPBF requirements.
6.How does Aetrix verify that LT3495EDDB#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LT3495EDDB#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#TRMPBF meets industry standards.
7.What is the process for return or replacement of LT3495EDDB#TRMPBF?
All LT3495EDDB#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3495EDDB#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#TRMPBF part is unused and in its original packaging.
Return procedure for LT3495EDDB#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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