Analog Devices Inc. LTC2915HDDB-1#TRPBF

Overview

LTC2915HDDB-1#TRPBF from Analog Devices (formerly Linear Technology) is a high-temperature voltage supervisor IC with 9 selectable nominal thresholds (12V to 1.0V + ADJ), –5%/–10%/–15% tolerance selection via TOL pin, ±1.5% threshold accuracy over –40°C to 125°C, and 30μA quiescent current. It monitors supply rails in automotive control systems where guaranteed operation at 125°C and glitch-immune reset assertion are critical.

For engineers reviewing the LTC2915HDDB-1#TRPBF datasheet, LTC2915HDDB-1#TRPBF pinout, LTC2915HDDB-1#TRPBF application, or LTC2915HDDB-1#TRPBF equivalent, key selection criteria include its 8-lead DFN (3mm × 2mm) package with exposed pad, internal 200ms reset timeout option, 1.5V to 5.5V VCC operation, and support for adjustable threshold down to 0.5V via external resistor divider.

Technical Context

The LTC2915HDDB-1#TRPBF implements a precision comparator-based monitoring architecture with three-state SEL1/SEL2/TOL inputs decoding 27 total threshold combinations (9 voltages × 3 tolerances). Its internal reference and divider matrix ensures ±1.5% trip point accuracy across temperature without external components.

Reset assertion is controlled by dual-stage immunity: a fast anti-glitch circuit (t_UV = 10–150μs) rejects short transients, while the programmable timeout (200ms internal or capacitor-adjusted) prevents spurious release during supply recovery. The open-drain RST output supports wired-OR configurations and operates reliably down to V_CC = 0.8V.

Key Specifications

Pinout & Package

Package: 8-lead plastic DFN (3mm × 2mm) with exposed thermal pad (Pin 9), RoHS-compliant, lead-free finish. Low-profile (1mm max height) suitable for space-constrained automotive modules.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LTC2915HDDB-1#TRPBF, LTC2916HDDB-1#TRPBF adds manual reset capability at the expense of tolerance adjustability, while LTC2903CS6-1#TRMPBF trades configurability for higher accuracy and smaller footprint in fixed 1.8V applications.

Availability

LTC2915HDDB-1#TRPBF is available at Aetrix Electronics and suitable for automotive control systems, industrial PLCs, and medical infusion pumps requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for LTC2915HDDB-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, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors for precision instrumentation, industrial automation, and automotive safety systems.

The LTC2915 product line was designed specifically for high-reliability voltage monitoring in harsh environments - emphasizing guaranteed parametric performance over –40°C to 125°C, low-power operation, and robust glitch immunity for automotive and industrial applications.

FAQ

What is the maximum supply voltage the LTC2915HDDB-1#TRPBF can tolerate on its VCC pin?

The LTC2915HDDB-1#TRPBF features an internal 6.2V shunt regulator on the VCC pin. When operated from supplies above 5.7V, a series current-limiting resistor must be used to keep VCC pin current ≤5mA. Without that resistor, the absolute maximum VCC voltage is 5.7V. This allows direct connection to 12V automotive batteries when properly configured, making the LTC2915HDDB-1#TRPBF suitable for under-hood applications.

How does the LTC2915HDDB-1#TRPBF achieve ±1.5% threshold accuracy over temperature?

The LTC2915HDDB-1#TRPBF achieves ±1.5% threshold accuracy through a trimmed internal reference and matched resistor divider network, characterized and guaranteed across –40°C to 125°C. This specification applies to all 27 selectable thresholds (e.g., 1.8V ±1.5% = 1.773V to 1.827V) and eliminates the need for external calibration - critical for automotive applications where thermal drift must not trigger false resets.

Can the LTC2915HDDB-1#TRPBF monitor a 1.35V supply rail?

Yes - the LTC2915HDDB-1#TRPBF supports adjustable threshold mode (ADJ = 0.5V) where an external resistor divider sets the trip point. To monitor 1.35V, configure the divider so VM = 0.5V at nominal 1.35V, yielding a trip range of 1.35V × (1 ± 0.015) × (1 ± 0.15) = ~1.13V to ~1.29V depending on selected tolerance. This makes the LTC2915HDDB-1#TRPBF adaptable to non-standard rails like DDR memory supplies.

What is the minimum VCC voltage required for the LTC2915HDDB-1#TRPBF to assert a valid reset?

The LTC2915HDDB-1#TRPBF guarantees RST assertion for VCC ≥ 0.8V, ensuring reliable reset generation even during 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 and VM drops below its programmed threshold, the reset timer initiates - a key feature enabling robust power-up sequencing in automotive systems with slow-ramping supplies.

Does the LTC2915HDDB-1#TRPBF support wired-OR reset bus configurations?

Yes - the LTC2915HDDB-1#TRPBF features an open-drain RST output, allowing multiple devices to share a common reset line with a single external pull-up resistor. This enables hierarchical reset architectures (e.g., combining CPU, memory, and peripheral supervisors) without contention. The RST pin can also be pulled above VCC (within absolute max ratings), supporting mixed-voltage system designs.