Analog Devices Inc. LTC2915ITS8-1#TRPBF

Overview

LTC2915ITS8-1#TRPBF from Analog Devices (formerly Linear Technology) is a precision voltage supervisor IC with 27 selectable reset thresholds, designed for monitoring power supplies in automotive and industrial systems. It operates from 1.5V to 5.5V supply, consumes only 30μA quiescent current, guarantees ±1.5% threshold accuracy over –40°C to +85°C, and features glitch-immune open-drain RST output with 200ms internal timeout - used in engine control units to ensure reliable microcontroller reset during cold cranking.

For engineers reviewing the LTC2915ITS8-1#TRPBF datasheet, LTC2915ITS8-1#TRPBF pinout, LTC2915ITS8-1#TRPBF application, or LTC2915ITS8-1#TRPBF equivalent, key selection criteria include its 9 nominal voltage selections (12V to 0.5V ADJ), 3 tolerance options (–5%/–10%/–15%), TSOT-23-8 package, guaranteed RST assertion down to VCC ≥ 0.8V, and operation up to 125°C junction temperature.

Technical Context

The LTC2915ITS8-1#TRPBF implements a precision comparator-based supervision architecture with three-state SEL1/SEL2/TOL inputs that configure internal resistor-divider ratios and tolerance bands without external components. Its VM input compares against internally generated reference voltages derived from a bandgap source, with threshold accuracy maintained via trimming across temperature.

Reset timing uses either an internal 200ms timer (RT tied to VCC) or an externally adjustable capacitor-based timeout (9ms/nF), while anti-glitch circuitry enforces minimum 10μs pulse width at VM for valid threshold crossing detection. The device includes a 6.2V shunt regulator on VCC to support direct connection to high-voltage rails up to 15V with proper series limiting resistance.

Key Specifications

Pinout & Package

Package: 8-Lead TSOT-23 (ThinSOT™), 3mm × 1.75mm × 1mm profile, exposed pad optional for thermal enhancement.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar voltage supervisor applications.

Compared with LTC2916ITS8-1#TRPBF, the LTC2915ITS8-1#TRPBF offers adjustable tolerance but lacks MR; versus TPS3808G18DBVR, it provides 27 thresholds and higher accuracy (±1.5% vs ±2.5%) at the cost of higher IQ, making it optimal for multi-rail automotive diagnostics where configurability and precision are critical.

Availability

LTC2915ITS8-1#TRPBF is available at Aetrix Electronics and suitable for automotive engine control units, industrial programmable logic controllers, optical transceiver modules, and medical imaging sensor interfaces requiring stable component supply across extended temperature ranges.

Supply support for LTC2915ITS8-1#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 and maintains its high-reliability analog IC portfolio, emphasizing precision, low-power, and automotive-qualified performance.

The LTC2915ITS8-1#TRPBF belongs to Linear's voltage supervisor product line, engineered for robust power-rail monitoring in harsh environments where supply stability directly impacts system safety and functional integrity.

FAQ

What is the guaranteed operating temperature range for the LTC2915ITS8-1#TRPBF?

The LTC2915ITS8-1#TRPBF is rated for –40°C to +85°C (I-grade), with all electrical specifications fully guaranteed across this range. This includes ±1.5% threshold accuracy, 30μA quiescent current, and reliable RST assertion down to VCC = 0.8V. The device is qualified per AEC-Q100 stress test conditions for automotive under-hood use, though not officially AEC-Q100 certified unless ordered with specific automotive suffixes.

How do I configure the LTC2915ITS8-1#TRPBF to monitor a 3.3V supply with –10% tolerance?

To monitor 3.3V at –10%, set SEL1 = VCC and SEL2 = GND per the Monitor Selection Table, and set TOL = Open for –10% tolerance. This configures the internal comparator to trip when VM falls below 2.97V (3.3V × 0.9). The ±1.5% accuracy ensures the actual trip point stays between 2.925V and 3.015V over temperature, safely outside the 3.3V±10% (2.97V–3.63V) operating band.

Can the LTC2915ITS8-1#TRPBF be used to monitor a 12V automotive battery directly?

Yes - the LTC2915ITS8-1#TRPBF includes a 6.2V shunt regulator on VCC, allowing direct connection to 12V battery rails. A series current-limiting resistor (RCC) must be added: for a 12V supply with 60V max spike, RCC = (60V – 5.7V)/5mA ≈ 10.86kΩ. This ensures VCC pin current stays within ±5mA absolute maximum rating while maintaining regulation and accurate threshold sensing.

What is the minimum VM input voltage required to guarantee RST deassertion after timeout?

The LTC2915ITS8-1#TRPBF guarantees RST deassertion only when VM exceeds the programmed threshold by more than 5% - e.g., for a 3.3V nominal setting, VM must rise above 3.465V to ensure reliable release after the timeout period. This 5% overdrive margin is specified in the tUV timing parameter and ensures noise immunity during recovery; operation near the exact threshold may result in metastable RST behavior.

Does the LTC2915ITS8-1#TRPBF support adjustable reset timeout, and how is it implemented?

Yes - the LTC2915ITS8-1#TRPBF supports adjustable reset timeout via the RT pin. Connecting a capacitor CRT from RT to GND sets tRST ≈ 9ms/nF (e.g., 2.2nF yields ~20ms). RT tied to VCC gives 200ms; floating RT yields ~400μs. The capacitor must be ceramic with low ESR; values from 100pF to 100nF are supported. This allows tailoring reset duration to system boot requirements without changing firmware or external logic.