Analog Devices Inc. LTC2911ITS8-5#TRPBF

Overview

LTC2911ITS8-5#TRPBF from Analog Devices (formerly Linear Technology) is a precision triple supply monitor IC with integrated power-fail comparator and latched reset control. It monitors V1 (3.3V), V2 (adjustable), and ADJ (0.5V threshold) inputs with ±1.5% threshold accuracy over –40°C to 85°C, supports internal 200ms reset timeout, and operates down to 0.5V VCC - enabling reliable supervision in low-voltage industrial power systems and battery-backed embedded controllers.

For engineers reviewing the LTC2911ITS8-5#TRPBF datasheet, LTC2911ITS8-5#TRPBF pinout, LTC2911ITS8-5#TRPBF application, or LTC2911ITS8-5#TRPBF equivalent, key selection criteria include its adjustable dual-supply monitoring capability (V2 and ADJ both configurable), PFI-based early-warning power-fail signaling, TMR latch for margin testing, and TSOT-23-8 package compatibility with space-constrained PCB layouts.

Technical Context

The LTC2911ITS8-5#TRPBF implements three independent voltage comparators: one fixed 3.3V monitor on V1, one high-impedance adjustable input on V2 (nominal 0.5V threshold), and a third on ADJ (also 0.5V threshold). Its internal VCC is derived solely from V1, decoupling operation from V2 supply integrity.

It features dual-mode reset timing: selectable internal 200ms timeout (TMR tied to V1) or external capacitor-controlled timeout (CTMR to GND), plus glitch-immune propagation delays (tUV = 8–80 µs) and programmable latch behavior via TMR pin logic thresholds (VTMR(LATCH) = 0.10–0.40 V).

Key Specifications

Pinout & Package

Package: 8-Lead Plastic TSOT-23 (TS8), 3.0 mm × 1.7 mm × 0.8 mm, exposed pad optional, RoHS-compliant lead-free finish.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6369UTA+T and TPS3808G33DBVR, the LTC2911ITS8-5#TRPBF uniquely integrates two fully adjustable monitor inputs (V2 and ADJ) with dedicated PFI/PFO signaling and latch-enabled margin testing - delivering complete triple-supply supervision in a single TSOT-23-8 package without external timing or logic components.

Availability

LTC2911ITS8-5#TRPBF is available at Aetrix Electronics and suitable for industrial PLC power sequencing, automotive body control modules, medical infusion pump controllers, and network edge router power management requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant sourcing.

Supply support for LTC2911ITS8-5#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. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.

The LTC2911 product line delivers precision, low-power supply monitoring ICs designed specifically for mission-critical embedded systems requiring guaranteed reset behavior across wide temperature ranges and deep brownout conditions.

FAQ

What is the exact V2 and ADJ threshold voltage specification for LTC2911ITS8-5#TRPBF?

The LTC2911ITS8-5#TRPBF specifies a nominal 500 mV threshold for both V2 and ADJ inputs, with ±7.5 mV (±1.5%) tolerance over the full –40°C to 85°C operating range. This is confirmed in the Electrical Characteristics table (VRTA and VPFT parameters) and applies identically to both pins in this -5 variant, enabling matched configuration of two independent adjustable rails.

How does the TMR pin function in latch mode for LTC2911ITS8-5#TRPBF?

In latch mode, pulling the TMR pin to GND forces the RST output to retain its current logic state (high or low) regardless of subsequent V1/V2/ADJ voltage changes. Releasing TMR (to open or V1) restores normal monitoring after tSU,MON setup time (2 ms minimum), with RST transitioning only after valid inputs persist for the full timeout period. This behavior is explicitly defined for LTC2911ITS8-5#TRPBF in the Timing Diagrams (Figure 6a–6d).

Can LTC2911ITS8-5#TRPBF monitor a 1.2V supply directly on the V2 pin?

No - the LTC2911ITS8-5#TRPBF is the -5 variant, which configures V2 as a high-impedance adjustable input with 500 mV threshold, not a fixed 1.2V monitor. To supervise a 1.2V rail, connect it to V2 (or ADJ) through a resistive divider that scales 1.2V down to 500 mV at the pin. Fixed 1.2V monitoring is only available in the LTC2911-4 variant, not LTC2911ITS8-5#TRPBF.

What is the maximum allowable leakage current for the external CTMR capacitor on LTC2911ITS8-5#TRPBF?

The external capacitor on the TMR pin must exhibit ≤500 nA leakage current to maintain timing accuracy. Higher leakage degrades the 9.4 ms/nF timeout coefficient, causing premature or delayed RST assertion. Ceramic capacitors (X7R, C0G) are recommended; electrolytic or high-leakage film types are unsuitable. This requirement is specified in the Applications Information section under "Setting the Reset Timeout".

Does LTC2911ITS8-5#TRPBF require separate bypass capacitors on V1 and V2 pins?

Yes - a 0.1 µF (or larger) ceramic bypass capacitor is required between V1 and GND per the datasheet recommendation. For the LTC2911ITS8-5#TRPBF variant, V2 is a high-impedance input and does not require bypassing; however, if noise immunity is critical, a small capacitor (e.g., 100 pF) may be added to V2 or ADJ. The V1 bypass is mandatory to stabilize the internal VCC rail derived solely from that pin.