Analog Devices Inc. LTC2917CDDB-A1#TRPBF

Overview

LTC2917CDDB-A1#TRPBF 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, 30μA quiescent current, and integrated watchdog timer. It monitors system supply rails in automotive control units and industrial embedded systems where reliable power-up sequencing and fault detection are critical.

For engineers reviewing the LTC2917CDDB-A1#TRPBF datasheet, LTC2917CDDB-A1#TRPBF pinout, LTC2917CDDB-A1#TRPBF application, or LTC2917CDDB-A1#TRPBF equivalent, this page delivers verified specifications, DFN-10 package layout, tolerance-selectable reset behavior, windowed watchdog capability (B-version only), and direct substitution guidance for automotive-grade supervision.

Technical Context

The LTC2917CDDB-A1#TRPBF implements a dual-stage comparator architecture with glitch-filtered VM input and internal reference division. Its three-state SEL1/SEL2 pins select one of nine nominal thresholds (e.g., 1.8V, 3.3V, 5V), while the TOL pin configures tolerance (–5%, –10%, –15%)-all without external resistors. Threshold accuracy is guaranteed at ±1.5% across temperature.

It features two independent timing paths: an adjustable reset timeout (via RT pin capacitor or VCC tie) and a watchdog timer (via WT pin capacitor or VCC tie). The A1 version supports standard watchdog operation (single upper boundary), not windowed mode-confirmed by part marking "A1" and absence of lower-boundary timing specs in its electrical characteristics table.

Key Specifications

Pinout & Package

Package: 10-lead (3mm × 2mm) plastic DFN with exposed pad (pin 11, optional GND connection).

Key Features

Applications

Equivalent & Alternatives

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

Compared with LTC2917CDDB-A1#TRPBF, the MSOP variant offers identical supervision logic but trades compactness for assembly ease, while the TPS3808G18DBVR sacrifices configurability and watchdog safety for ultra-low power and lower cost in static 1.8V monitoring.

Availability

LTC2917CDDB-A1#TRPBF is available at Aetrix Electronics and suitable for automotive control systems, optical networking equipment, and industrial embedded controllers requiring stable component supply with guaranteed 0°C to 70°C operation and long-term lifecycle support.

Supply support for LTC2917CDDB-A1#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 full technical and manufacturing continuity for the LTC portfolio. Linear's legacy expertise in precision analog and power management remains central to these devices.

The LTC2917 family was designed specifically for automotive and industrial applications demanding high-accuracy, low-power, and configurable supply monitoring with integrated watchdog safety - targeting environments where system reliability cannot be compromised.

FAQ

What is the maximum supply voltage the LTC2917CDDB-A1#TRPBF can tolerate on its VCC pin?

The LTC2917CDDB-A1#TRPBF has an absolute maximum VCC rating of 5.7V for direct connection. However, it integrates a 6.2V shunt regulator, enabling safe operation from higher supplies (e.g., 12V automotive battery) when a current-limiting series resistor is used to restrict VCC pin current to ≤5mA. Exceeding 5.7V without that resistor risks violating terminal current limits.

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

No. The LTC2917CDDB-A1#TRPBF is an "A1" version, which implements standard watchdog behavior with only an upper timeout boundary (tWDU). Windowed watchdog - requiring both upper and lower boundaries (tWDL) - is exclusive to "B1" versions like LTC2917CDDB-B1#TRPBF. The A1 version responds only to falling edges on WDI and does not enforce minimum pulse intervals.

Can the LTC2917CDDB-A1#TRPBF monitor a 1.2V supply with –15% tolerance?

Yes. Using SEL1=GND and SEL2=VCC selects the 1.2V nominal threshold, and setting TOL=GND configures –15% tolerance, resulting in a trip point of 1.02V (1.2V × 0.85). This combination is explicitly defined in the Monitor Selection Table and validated across temperature with ±1.5% accuracy, yielding a guaranteed trip range of 1.002V to 1.038V.

What is the purpose of the exposed pad on the DFN package of the LTC2917CDDB-A1#TRPBF?

The exposed pad (pin 11) on the LTC2917CDDB-A1#TRPBF's DFN package serves primarily as a thermal path. It may be left unconnected or soldered to a PCB ground plane to improve thermal dissipation - especially important in high-ambient environments like automotive under-hood applications. Electrical connection to GND is optional and does not affect functional operation.

How does the LTC2917CDDB-A1#TRPBF ensure reliable reset assertion during power-up?

The LTC2917CDDB-A1#TRPBF guarantees RST assertion down to VCC = 0.8V, well below its 1.5V undervoltage lockout threshold. This ensures the reset signal is active before the monitored microcontroller reaches its operational voltage, preventing undefined startup states. Once VCC exceeds 1.5V and VM rises above the selected threshold, the internal 200ms timer (RT tied to VCC) begins, releasing RST only after timeout completion.