Analog Devices Inc. LTC2917IDDB-A1#TRMPBF

Overview

LTC2917IDDB-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 +85°C, adjustable reset and watchdog timers, and windowed watchdog capability in B versions. It operates from 1.5V to 5.5V supply, consumes 30μA quiescent current, and is used for reliable power-on reset and system-level fault detection in automotive control units.

For engineers reviewing the LTC2917IDDB-A1#TRMPBF datasheet, LTC2917IDDB-A1#TRMPBF pinout, LTC2917IDDB-A1#TRMPBF application, or LTC2917IDDB-A1#TRMPBF equivalent, this page delivers verified functional identity, exact pin roles, confirmed timing parameters (tRST = 200ms internal, tWDU = 1.6s), tolerance selection logic (–5%/–10%/–15%), and validated alternative options for industrial and automotive supervisory designs.

Technical Context

The LTC2917IDDB-A1#TRMPBF implements a dual-stage supervision architecture: a high-accuracy comparator monitors VM against one of nine factory-programmed thresholds selected via SEL1/SEL2, while TOL configures tolerance (–5%, –10%, –15%). Its internal 200ms reset timer and 1.6s watchdog timer are activated without external components when RT and WT are tied to VCC.

This A1 variant uses the LTC2917-A architecture (non-windowed watchdog), supports manual reset disable (no MR pin), and guarantees operation down to VCC = 0.8V with RST assertion. Glitch immunity is ensured by combined 10μs–150μs input filtering and timeout-based state hold, meeting automotive reliability requirements up to 125°C junction temperature.

Key Specifications

Pinout & Package

Package: 10-lead (3mm × 2mm) plastic DFN with exposed pad (pin 11, optional GND connection). Pin count and layout match MSOP but with smaller footprint and improved thermal performance (θJA = 43°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6326US29D3+T and TPS3808G18DBVR, the LTC2917IDDB-A1#TRMPBF offers unique configurability across 9 voltage levels and 3 tolerances without external components, making it optimal for multi-rail systems where BOM reduction and design reuse are critical - whereas alternatives trade programmability for lower IQ or smaller footprint.

Availability

LTC2917IDDB-A1#TRMPBF is available at Aetrix Electronics and suitable for automotive control systems, industrial PLCs, medical infusion pumps, and telecom base station management requiring stable component supply with guaranteed long-term availability.

Supply support for LTC2917IDDB-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 acquired Linear Technology in 2017 and maintains its precision analog and power management product lines with automotive-grade qualification and long-term manufacturing commitment.

The LTC2917 family was designed specifically for high-reliability power supervision in harsh environments - emphasizing threshold accuracy, glitch immunity, wide temperature operation, and minimal external component count for automotive and industrial applications.

FAQ

What is the function of the TOL pin on the LTC2917IDDB-A1#TRMPBF?

The TOL pin on the LTC2917IDDB-A1#TRMPBF selects the tolerance band for the monitored voltage: VCC sets –5%, open sets –10%, and GND sets –15%. This determines how far below the nominal threshold (e.g., 3.3V) the VM input must fall before RST asserts. The LTC2917IDDB-A1#TRMPBF uses this to configure hysteresis without external components, supporting robust margin testing in production and field operation.

Does the LTC2917IDDB-A1#TRMPBF support windowed watchdog functionality?

No, the LTC2917IDDB-A1#TRMPBF implements the LTC2917-A architecture, which provides standard watchdog timing (upper boundary only) and does not monitor lower boundary violations. Windowed watchdog behavior is exclusive to B1 versions (e.g., LTC2917IDDB-B1#TRMPBF). For the LTC2917IDDB-A1#TRMPBF, WDI edges must simply occur before tWDU expires to prevent reset assertion.

Can the LTC2917IDDB-A1#TRMPBF monitor a 12V supply directly?

Yes - the LTC2917IDDB-A1#TRMPBF includes an internal 6.2V shunt regulator on the VCC pin. To monitor 12V, connect it through a current-limiting resistor (e.g., 11kΩ for 12V automotive) to keep VCC pin current ≤5mA. Configure SEL1/SEL2 = VCC/VCC for 12V nominal threshold and TOL = VCC for –5% tolerance, enabling direct high-voltage supervision without external regulators.

What is the minimum VCC voltage required for valid RST operation in the LTC2917IDDB-A1#TRMPBF?

The LTC2917IDDB-A1#TRMPBF guarantees RST assertion down to VCC = 0.8V, ensuring reliable reset generation even during severe brown-out conditions. Below 1.5V, the device remains in undervoltage lockout and holds RST low regardless of VM state. Once VCC exceeds 1.5V, the comparator becomes active and RST responds to VM relative to the programmed threshold.

How do I configure the LTC2917IDDB-A1#TRMPBF for an adjustable 0.5V threshold?

To configure the LTC2917IDDB-A1#TRMPBF for ADJ mode, set SEL1 = GND and SEL2 = GND. Connect VM to the tap point of an external resistive divider between the monitored supply and ground, sized so VM = 0.5V at nominal supply voltage. The LTC2917IDDB-A1#TRMPBF compares VM directly to its internal 0.5V reference, enabling precise custom thresholds with ±15nA input leakage.