Analog Devices Inc. LTC2917CDDB-A1#TRMPBF

Overview

LTC2917CDDB-A1#TRMPBF from Analog Devices (formerly Linear Technology) is a precision voltage supervisor IC with 9 selectable nominal thresholds (12V to 0.5V ADJ), ±1.5% threshold accuracy over –40°C to 125°C, and an adjustable watchdog timer. It operates from 1.5V to 5.5V supply, consumes only 30μA quiescent current, and features glitch-filtered reset assertion for reliable power-up/power-down sequencing in automotive control systems.

For engineers reviewing the LTC2917CDDB-A1#TRMPBF datasheet, LTC2917CDDB-A1#TRMPBF pinout, LTC2917CDDB-A1#TRMPBF application, or LTC2917CDDB-A1#TRMPBF equivalent, this device supports critical system-level supervision tasks including supply margining, windowed watchdog monitoring (B-version), manual reset interface (LTC2918 only), and high-temperature operation up to 125°C - all in a compact 10-lead (3mm × 2mm) DFN package.

Technical Context

The LTC2917CDDB-A1#TRMPBF implements a dual-stage supervision architecture: a comparator-based VM input monitors supply voltage against one of nine internally programmed thresholds selected via SEL1/SEL2 three-state inputs, while TOL selects tolerance (–5%, –10%, –15%). Its reset timeout (tRST) and watchdog upper boundary (tWDU) are configurable via RT/WT pins using internal timers or external capacitors.

This A1 variant is the standard-threshold version (non-windowed watchdog) with fixed –5% tolerance selection logic, distinguishing it from B1 versions that support windowed watchdog operation. It lacks MR (manual reset) functionality - exclusive to LTC2918 family members - and uses a 10-lead DFN package with exposed pad connected to GND for thermal performance.

Key Specifications

Pinout & Package

Package: 10-Lead (3mm × 2mm) Plastic DFN with exposed pad (Pin 11), rated for θJA = 43°C/W. Exposed pad may be left unconnected or tied to PCB GND for improved thermal performance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LTC2917CDDB-A1#TRMPBF, the IDDB-A1 offers broader temperature capability for industrial environments, while the HDDB-A1 delivers automotive-grade robustness and extended thermal margin - both retain identical pinout, timing, and threshold programming, enabling drop-in replacement with no layout changes.

Availability

LTC2917CDDB-A1#TRMPBF is available at Aetrix Electronics and suitable for automotive engine control units, industrial PLC power sequencing, medical sensor nodes, and telecom base station power management requiring stable component supply across production lifecycles.

Supply support for LTC2917CDDB-A1#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 digital signal processing semiconductors.

The LTC2917 family was designed specifically for high-reliability power supervision in automotive, industrial, and communications systems - emphasizing precision threshold accuracy, low quiescent power, and robust glitch immunity in compact packages.

FAQ

What is the function of the TOL pin on the LTC2917CDDB-A1#TRMPBF?

The TOL pin on the LTC2917CDDB-A1#TRMPBF selects the tolerance band applied to the chosen nominal threshold: connecting to VCC sets –5%, leaving open selects –10%, and tying to GND configures –15%. This allows precise alignment of the reset trip point relative to the monitored supply's specified tolerance, ensuring reliable operation without nuisance resets. The LTC2917CDDB-A1#TRMPBF implements this feature as part of its core supervision architecture.

Does the LTC2917CDDB-A1#TRMPBF support windowed watchdog functionality?

No, the LTC2917CDDB-A1#TRMPBF is an A1-version device and implements only standard watchdog timing (single upper boundary). Windowed watchdog - requiring both upper and lower timing boundaries - is exclusive to B1 variants like LTC2917CDDB-B1#TRMPBF. The A1 version asserts RST if WDI is not toggled before tWDU expires, but does not monitor minimum interval between edges.

Can the LTC2917CDDB-A1#TRMPBF monitor a 12V supply directly?

Yes, the LTC2917CDDB-A1#TRMPBF can monitor a 12V supply using its internal 6.2V shunt regulator on the VCC pin. A series current-limiting resistor (e.g., 11kΩ for 12V input) must be placed between the 12V source and VCC to keep input current ≤5mA. The VM pin then connects directly to the 12V rail, with SEL1/SEL2 configured for 12V threshold selection (both tied to VCC).

What is the minimum supply voltage required for the LTC2917CDDB-A1#TRMPBF to guarantee RST assertion?

The LTC2917CDDB-A1#TRMPBF guarantees RST assertion when VCC ≥ 0.8V, even before exiting undervoltage lockout (which occurs at <1.5V). This ensures early reset signaling during power-up and reliable fault detection during brownout conditions. Below 0.8V, RST behavior is undefined. This specification applies across the full 0°C to 70°C operating range of the LTC2917CDDB-A1#TRMPBF.

How does the LTC2917CDDB-A1#TRMPBF handle supply glitches near the threshold voltage?

The LTC2917CDDB-A1#TRMPBF combines two anti-glitch mechanisms: a dedicated comparator input filter with 10–150μs minimum pulse rejection (tUV), and a programmable reset timeout (tRST) that prevents RST release until the monitored supply remains above threshold for the full duration. This dual-layer approach ensures transient noise or load spikes do not cause false resets, while preserving accurate DC threshold detection - a key design feature of the LTC2917CDDB-A1#TRMPBF.