Analog Devices Inc. LTC2906CDDB#TRPBF

Overview

LTC2906CDDB#TRPBF from Analog Devices (formerly Linear Technology) is a precision dual supply monitor IC with one pin-selectable threshold input (5V/3.3V/2.5V) and one adjustable 0.5V input, featuring ±1.5% threshold accuracy over temperature, 200ms fixed reset delay, open-drain RST output, and guaranteed operation down to V1 ≥ 1V or VCC ≥ 1V. It is used in desktop/notebook computers and network servers for reliable power-up/power-down sequencing and brownout detection.

For engineers reviewing the LTC2906CDDB#TRPBF datasheet, LTC2906CDDB#TRPBF pinout, LTC2906CDDB#TRPBF application, or LTC2906CDDB#TRPBF equivalent, this page delivers verified technical context, exact pin functions, real-world use cases, and validated alternative parts - all grounded in the official Linear Technology LTC2906/LTC2907 datasheet (29067f).

Technical Context

The LTC2906CDDB#TRPBF integrates two independent voltage comparators: one with programmable thresholds via S1/TOL three-state inputs (5V/3.3V/2.5V at 5%/7.5%/10% tolerance), and another with a fixed 0.5V nominal threshold on VADJ. Its internal VMAX logic selects the higher of V1 or VCC as the supply for reset generation and output drivers.

It features glitch-immune comparator outputs with integrated low-pass filtering and a 200ms monolithic reset timer (non-adjustable, unlike LTC2907). The RST output is open-drain with weak internal pull-up to VMAX and strong pull-down to GND, ensuring valid logic states even during brownout when VMAX ≥ 1V.

Key Specifications

Pinout & Package

Package: 8-lead (3mm × 2mm) plastic DFN (DDB8), exposed pad (Pin 9) soldered to PCB for thermal and electrical GND connection.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-supply monitoring applications.

Compared with LTC2907CDDB#TRPBF, LTC2906CDDB#TRPBF trades adjustability for simplicity and reduced component count; versus TPS3808G33DBVR, it delivers true dual-rail supervision with programmable thresholds and superior accuracy - making it optimal for multi-voltage embedded systems requiring robust power sequencing.

Availability

LTC2906CDDB#TRPBF is available at Aetrix Electronics and suitable for desktop computers, notebook PCs, and network servers requiring stable component supply, long-term industrial availability, and guaranteed parametric performance across temperature.

Supply support for LTC2906CDDB#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 and maintains its high-performance analog IC portfolio, emphasizing precision, reliability, and signal integrity for demanding industrial and computing applications.

The LTC2906 belongs to Linear's precision power monitoring product line, designed specifically for systems requiring accurate, glitch-immune dual-supply supervision with minimal external components and guaranteed operation under brownout conditions.

FAQ

What is the operating temperature range for LTC2906CDDB#TRPBF?

The LTC2906CDDB#TRPBF is rated for 0°C to 70°C ambient operation (Commercial grade). Its ±1.5% threshold accuracy and 200ms reset timing are guaranteed across this full range, as confirmed in the Electrical Characteristics table of the official datasheet (29067f, p.2).

Does LTC2906CDDB#TRPBF require external capacitors for basic operation?

Yes - LTC2906CDDB#TRPBF requires 0.1µF bypass capacitors on VCC, V1, and VADJ pins to ensure noise immunity and stable reference operation. No capacitor is needed on RST or TOL/S1 pins, and the 200ms delay is internal - eliminating the need for an external timing capacitor unlike the LTC2907 variant.

Can LTC2906CDDB#TRPBF monitor a 1.2V supply?

Yes - LTC2906CDDB#TRPBF can monitor 1.2V supplies using the VADJ input. With TOL set for 5% tolerance and a properly scaled resistor divider (e.g., 124kΩ/100kΩ per Table 2), VADJ trips at 1.120V nominal, delivering ±1.5% accuracy (1.103V–1.137V) over temperature.

Is the exposed pad on the DDB8 package electrically connected?

Yes - the exposed pad (Pin 9) on the LTC2906CDDB#TRPBF DDB8 package is internally connected to GND and must be soldered to the PCB ground plane. This connection is mandatory for thermal dissipation, noise reduction, and proper device operation per the package drawing (LTC DWG #05-08-1702).

How does LTC2906CDDB#TRPBF handle power-up when V1 and VCC ramp at different rates?

LTC2906CDDB#TRPBF uses VMAX = max(V1, VCC) as its internal supply. As soon as either V1 or VCC reaches 1V, RST asserts low and remains asserted until both monitored voltages exceed their programmed thresholds for the full 200ms delay - ensuring deterministic reset release regardless of rail sequencing order.