Analog Devices Inc. LTC2915HDDB-1#TRMPBF

Overview

LTC2915HDDB-1#TRMPBF from Analog Devices (formerly Linear Technology) is a high-temperature voltage supervisor IC with 27 selectable reset thresholds, operating from 1.5V to 5.5V supply and consuming only 30μA quiescent current. It features three-state SEL1/SEL2/TOL inputs for precise threshold selection (e.g., 1.8V ±5%), ±1.5% threshold accuracy over –40°C to 125°C, glitch-filtered open-drain RST output, and internal 200ms reset timeout - used in automotive control systems for reliable power-on reset under harsh thermal conditions.

For engineers reviewing the LTC2915HDDB-1#TRMPBF datasheet, LTC2915HDDB-1#TRMPBF pinout, LTC2915HDDB-1#TRMPBF application, or LTC2915HDDB-1#TRMPBF equivalent, key selection criteria include its DFN-8 (3mm × 2mm) package, H-grade temperature range (–40°C to 125°C), tolerance-selectable thresholds, VM input impedance of 0.5–8MΩ, and guaranteed RST assertion down to VCC = 0.8V.

Technical Context

The LTC2915HDDB-1#TRMPBF implements a precision comparator-based supervision architecture with internally trimmed reference dividers and three-state logic decoding for threshold selection. Its VM input accepts fixed nominal voltages (12V to 1.0V) or adjustable 0.5V reference, while TOL pin configures –5%/–10%/–15% tolerance bands - all guaranteed within ±1.5% over full temperature range.

Reset timing uses either internal 200ms timer (RT tied to VCC) or external capacitor (9ms/nF scaling), with anti-glitch circuitry enforcing minimum 10–150μs pulse width at VM to prevent false triggering. The device includes a 6.2V shunt regulator on VCC for operation up to 12V supplies when paired with a series current-limiting resistor.

Key Specifications

Pinout & Package

Package: 8-Lead (3mm × 2mm) Plastic DFN with exposed pad (Pin 9), rated for –40°C to 125°C operation and θJA = 76°C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LTC2915HDDB-1#TRMPBF, LTC2916HDDB-1#TRMPBF trades tolerance programmability for manual reset functionality, while LTC2903CMS8-3.3#TRPBF offers higher accuracy and lower IQ in a smaller package but lacks multi-threshold flexibility - making LTC2915HDDB-1#TRMPBF optimal for automotive systems requiring both thermal robustness and design-time margining.

Availability

LTC2915HDDB-1#TRMPBF is available at Aetrix Electronics and suitable for automotive control systems, industrial PLCs, medical infusion pumps, and telecom base station power management requiring stable component supply across extended temperature ranges.

Supply support for LTC2915HDDB-1#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 LTC2915 belongs to Linear's precision voltage supervisor product line, designed specifically for automotive, industrial, and medical systems demanding guaranteed operation at 125°C and configurable reset thresholds with tight accuracy.

FAQ

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

The LTC2915HDDB-1#TRMPBF has an absolute maximum VCC rating of 5.7V for direct connection. However, it integrates a 6.2V shunt regulator, allowing operation from higher voltages (e.g., 12V automotive battery) when a series current-limiting resistor is used to keep VCC pin current ≤5mA. Without that resistor, exceeding 5.7V risks violating terminal current limits and damaging the device. Always refer to the shunt regulator sizing equation in the datasheet for proper resistor selection.

Does the LTC2915HDDB-1#TRMPBF support adjustable reset timeout using an external capacitor?

Yes, the LTC2915HDDB-1#TRMPBF supports adjustable reset timeout via the RT pin. Connecting a capacitor (CRT) from RT to GND sets tRST ≈ 9ms/nF - for example, a 2.2nF capacitor yields ~20ms. Leaving RT floating gives ~400μs; tying RT to VCC selects the fixed 200ms internal timeout. This flexibility allows tailoring reset duration to specific microcontroller or FPGA power-up requirements without redesigning the PCB layout.

How does the TOL pin function on the LTC2915HDDB-1#TRMPBF, and what are its valid logic states?

The TOL pin on the LTC2915HDDB-1#TRMPBF is a three-state input that selects the tolerance band: VCC = –5%, open = –10%, GND = –15%. It must be driven to one of these three states (not left floating in functional operation) to define the reset hysteresis relative to the nominal threshold set by SEL1/SEL2. Leakage current in the open state is specified at ±5μA, so high-impedance drivers or pull-up/down resistors may be needed in noisy environments to maintain state integrity.

Can the LTC2915HDDB-1#TRMPBF monitor a 12V supply while powered from a separate 3.3V rail?

No - the LTC2915HDDB-1#TRMPBF requires VCC to power its internal circuitry, and its VM input is referenced to VCC's ground. To monitor a 12V supply, VCC must be derived from that same 12V source (using the internal 6.2V shunt regulator with a series resistor) or from a regulated auxiliary supply. Attempting to power VCC from 3.3V while monitoring 12V on VM violates the VM input voltage limit (max 15V) and invalidates threshold accuracy, as the internal reference scaling assumes VCC ≥1.5V and proper shunt operation.

What is the guaranteed minimum VCC voltage required for the LTC2915HDDB-1#TRMPBF to assert a valid RST signal?

The LTC2915HDDB-1#TRMPBF guarantees RST assertion (low) down to VCC = 0.8V, even before exiting undervoltage lockout (which occurs at ≤1.5V). This ensures the microcontroller receives a clean reset signal during deep brown-out conditions. However, accurate threshold detection on VM requires VCC ≥1.5V - below that, the device remains in UVLO and ignores VM state. So RST is asserted for safety at 0.8V, but precise voltage monitoring only begins once VCC exceeds 1.5V.