Analog Devices Inc. LTC2915IDDB-1#TRPBF

Overview

LTC2915IDDB-1#TRPBF from Analog Devices (formerly Linear Technology) is a precision voltage supervisor IC with 27 selectable reset thresholds, designed for reliable power-on reset and supply monitoring in automotive and industrial systems. It operates from 1.5V to 5.5V, consumes only 30μA quiescent current, guarantees ±1.5% threshold accuracy over –40°C to 125°C, and features glitch-filtered open-drain RST output with 200ms internal timeout - used in engine control units to ensure deterministic microcontroller startup under cold-crank conditions.

For engineers reviewing the LTC2915IDDB-1#TRPBF datasheet, LTC2915IDDB-1#TRPBF pinout, LTC2915IDDB-1#TRPBF application, or LTC2915IDDB-1#TRPBF equivalent, key selection criteria include its 9 nominal voltage selections (12V to 0.5V ADJ), three-state tolerance configuration (–5%/–10%/–15%), TSOT-23/DFN package compatibility, guaranteed RST assertion down to VCC ≥ 0.8V, and operation up to 125°C without derating.

Technical Context

The LTC2915IDDB-1#TRPBF implements a precision comparator-based supervision architecture with internally trimmed voltage references and programmable hysteresis via three-state SEL1/SEL2/TOL inputs. Its VM input monitors external supplies against one of nine nominal thresholds (12V, 5V, 3.3V, 2.5V, 1.8V, 1.5V, 1.2V, 1.0V, or ADJ=0.5V), each configurable with ±5%, ±10%, or ±15% tolerance bands.

Reset timing is controlled either by an internal 200ms timer (RT tied to VCC) or an external capacitor (9ms/nF scaling), while glitch immunity is ensured by both a 10–150μs minimum undervoltage detect-to-RST delay (tUV) and a robust reset timeout mechanism that prevents false triggering during transient supply disturbances.

Key Specifications

Pinout & Package

Package: 8-Lead (3mm × 2mm) Plastic DFN with exposed pad (Pin 9), RoHS-compliant, moisture sensitivity level 1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LTC2916IDDB-1#TRPBF, the LTC2915IDDB-1#TRPBF offers flexible tolerance selection but lacks manual reset; versus LTC2903CTS8-3#TRMPBF, it provides 27 programmable thresholds and higher temperature rating at the expense of higher quiescent current - making it optimal for automotive and industrial multi-rail systems requiring configurability and ruggedness.

Availability

LTC2915IDDB-1#TRPBF is available at Aetrix Electronics and suitable for automotive engine control units, industrial PLC I/O modules, medical imaging power sequencing, and infotainment head units requiring stable component supply across extended temperature ranges.

Supply support for LTC2915IDDB-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.

The LTC2915 belongs to Linear's precision voltage supervisor product line, engineered specifically for automotive and industrial applications demanding guaranteed operation from –40°C to 125°C, ±1.5% threshold accuracy, and robust glitch immunity.

FAQ

What is the maximum supply voltage the LTC2915IDDB-1#TRPBF can tolerate on its VCC pin?

The LTC2915IDDB-1#TRPBF includes an internal 6.2V shunt regulator on the VCC pin. When operated above 5.7V, a series current-limiting resistor must be used to keep VCC pin current ≤5mA. Absolute maximum VCC voltage is 5.7V without external resistor; with proper resistor sizing, the device can safely monitor 12V automotive battery rails. The shunt regulator clamps excess voltage, protecting internal circuitry while enabling high-voltage operation.

How does the LTC2915IDDB-1#TRPBF achieve ±1.5% threshold accuracy over temperature?

The LTC2915IDDB-1#TRPBF achieves ±1.5% threshold accuracy over –40°C to 125°C through laser-trimmed internal voltage references and matched comparator input stages. This specification is guaranteed across the full operating temperature range, not just at 25°C, and applies uniformly to all 27 selectable thresholds. The accuracy includes contributions from reference drift, comparator offset, and resistor divider ratio stability in ADJ mode.

Can the LTC2915IDDB-1#TRPBF monitor a 24V supply directly?

No - the LTC2915IDDB-1#TRPBF cannot monitor 24V directly on its VM pin, which has absolute maximum rating of 15V. However, it can supervise a 24V rail indirectly using an external resistive divider to scale the voltage to within the 0.5V–12V range (e.g., 24V → 1.2V via 20:1 divider). The VM input impedance (0.5–8MΩ) ensures minimal loading, and the ADJ mode supports this configuration with ±1.5% total accuracy including divider tolerance effects.

What is the purpose of the TOL pin on the LTC2915IDDB-1#TRPBF?

The TOL pin on the LTC2915IDDB-1#TRPBF selects the tolerance band applied to the chosen nominal threshold: VCC = –5%, Open = –10%, GND = –15%. This enables precise alignment with system supply specifications (e.g., a 5V±10% rail uses –10% tolerance to avoid nuisance resets). Unlike the LTC2916, the LTC2915IDDB-1#TRPBF requires this third control input to configure hysteresis, making it ideal for margin testing and production validation.

Does the LTC2915IDDB-1#TRPBF require external components for basic operation?

Yes - the LTC2915IDDB-1#TRPBF requires a 0.1μF ceramic bypass capacitor between VCC and GND for stable operation. An external pull-up resistor on RST (typically 10kΩ to VCC or logic rail) is also mandatory since RST is open-drain. No external resistors are needed for threshold selection (SEL1/SEL2/TOL are three-state), but an RT capacitor is required only if adjustable timeout is desired - tying RT to VCC enables 200ms timeout with zero external parts beyond bypass and pull-up.