Analog Devices Inc. LT3495EDDB-1#TRPBF

Overview

LT3495EDDB-1#TRPBF 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 LT3495EDDB-1#TRPBF datasheet, LT3495EDDB-1#TRPBF pinout, LT3495EDDB-1#TRPBF application, or LT3495EDDB-1#TRPBF equivalent, key selection considerations include its fixed 350mA switch current limit, guaranteed audio-band–free operation, integrated output disconnect for true shutdown isolation, and CTRL-pin–enabled dynamic output voltage dimming in portable displays and low-noise power rails.

Technical Context

The LT3495EDDB-1#TRPBF employs a variable peak-current, variable off-time control architecture that simultaneously regulates output voltage and enforces a minimum switching frequency of ~45kHz - preventing audible noise under all load conditions. Its internal 76kΩ feedback resistor and 1.235V reference enable precise output setting via a single external resistor.

It integrates a high-performance NPN power switch (350mA typical current limit), a PMOS output disconnect switch (with 250–450mA current limiting and 8.7V V_CAP–V_OUT clamp), and an auxiliary CTRL pin that overrides the internal reference down to 0V for real-time output dimming - all in a thermally enhanced 10-lead 3mm × 2mm DFN package with exposed ground pad.

Key Specifications

Pinout & Package

LT3495EDDB-1#TRPBF is housed in a 10-lead 3mm × 2mm plastic DFN package (DDB) with exposed thermal pad (Pin 11) that must be soldered to PCB ground for thermal and electrical performance.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar boost converter applications.

Compared with LT3495EDDB#TRPBF, the LT3495EDDB-1#TRPBF trades peak current capacity for tighter audio-noise control, while LT3495B-1EDDB#TRPBF removes the minimum frequency guardband to achieve deeper sleep states - making each variant optimal for distinct low-power system architectures.

Availability

LT3495EDDB-1#TRPBF is available at Aetrix Electronics and suitable for OLED display power, portable audio bias rails, industrial sensor excitation, and low-power data acquisition requiring stable component supply, consistent parametric performance, and long-term production support.

Supply support for LT3495EDDB-1#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 (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 low-noise, micropower boost conversion in space-constrained portable electronics - emphasizing audio-band–free operation, integrated disconnect, and analog dimming capability for display power.

FAQ

What is the maximum output voltage supported by the LT3495EDDB-1#TRPBF?

The LT3495EDDB-1#TRPBF supports output voltages up to 40V, as confirmed by its absolute maximum SW, CAP, and VOUT voltage ratings. This enables direct powering of high-voltage OLED panels, white LED strings, and analog sensor bias rails without cascaded regulation. Operation near 40V requires careful attention to layout, capacitor voltage derating, and thermal management due to increased power dissipation in the internal switch and PMOS disconnect device.

How does the CTRL pin function in the LT3495EDDB-1#TRPBF?

The CTRL pin in the LT3495EDDB-1#TRPBF serves as an auxiliary reference input that overrides the internal 1.235V feedback reference when driven between 0V and 1.235V. When used, the LT3495EDDB-1#TRPBF regulates the FB pin to match the CTRL voltage, enabling analog dimming or programmable output scaling. For fixed-output operation, CTRL must be held ≥1.5V. The pin draws only 20–100nA, allowing high-impedance control sources.

Does the LT3495EDDB-1#TRPBF require an external feedback resistor?

Yes, the LT3495EDDB-1#TRPBF requires one external resistor (R1) connected between VOUT and FB to set the output voltage. An internal 76kΩ resistor connects FB to GND, forming a voltage divider. The standard formula is R1 = 76kΩ × (V_OUT/1.235 – 1). For example, a 16V output requires R1 ≈ 909kΩ. No second resistor is needed - the internal 76kΩ replaces the traditional bottom-divider resistor.

What is the purpose of the exposed pad on the LT3495EDDB-1#TRPBF package?

The exposed pad (Pin 11) on the LT3495EDDB-1#TRPBF is electrically and thermally connected to GND. It must be soldered to a PCB ground plane to ensure proper thermal dissipation (θ_JA = 76°C/W) and stable electrical reference. Omitting this connection degrades efficiency, increases junction temperature, and may cause thermal shutdown or parameter shift - especially under sustained 350mA switching current.

Can the LT3495EDDB-1#TRPBF drive loads directly from the CAP pin?

Yes, the LT3495EDDB-1#TRPBF can drive loads from the CAP pin instead of VOUT to improve efficiency by bypassing the PMOS disconnect switch's on-resistance. However, doing so eliminates output isolation during shutdown - the CAP node remains at ~V_CC – 0.7V (diode drop) rather than floating to GND. Feedback must still connect to VOUT to maintain regulation accuracy and avoid offset from PMOS V_DS.