Analog Devices Inc. LTC2901-3IGN#TRPBF

Overview

LTC2901-3IGN#TRPBF from Analog Devices (acquired Linear Technology) is a programmable quad supply monitor IC with open-drain RST output, adjustable reset and watchdog timers, and 16 selectable voltage threshold combinations for 5V/3.3V/3V/2.5V/1.8V/1.5V/±Adj inputs. It guarantees ±1.5% threshold accuracy over temperature, supports 5% or 10% undervoltage tolerance (TOL pin-selectable), and draws only 43μA typical supply current. It is used in multivoltage systems requiring reliable power-up sequencing and brownout detection.

For engineers reviewing the LTC2901-3IGN#TRPBF datasheet, LTC2901-3IGN#TRPBF pinout, LTC2901-3IGN#TRPBF application, or LTC2901-3IGN#TRPBF equivalent, key selection criteria include its open-drain RST architecture, TOL pin logic-level control for 5%/10% thresholds, CRT/CWT capacitor-programmable timing, guaranteed RST assertion down to VCC = 1V, and compatibility with ±Adj negative voltage monitoring via VREF-referenced divider networks.

Technical Context

The LTC2901-3IGN#TRPBF implements four independent high-accuracy comparators with glitch-immune input stages, each tied to a dedicated COMPX output and jointly driving an open-drain RST output. Its internal bandgap reference (1.210V ±1.5%) feeds both the VPG programming interface and the –ADJ mode offset, enabling precise ratiometric threshold setting across all 16 configurations.

Reset timing is generated by a 2μA constant-current source charging CRT to a 1.3V threshold; watchdog timing uses identical architecture on CWT. The TOL pin directly selects between two internal reference scaling factors-no resistor change required when switching between 5% and 10% tolerance modes-ensuring seamless reconfiguration in field-deployed systems.

Key Specifications

Pinout & Package

16-lead narrow SSOP package (GN16), 5.0mm × 6.2mm body, 0.635mm pitch, RoHS-compliant lead-free finish (#TRPBF).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad supply monitoring applications.

Compared with MAX6812HEUS+T and TPS3307-33DGNR, the LTC2901-3IGN#TRPBF offers unique flexibility in threshold selection (16 combos), dual-tolerance operation (5%/10%), and integrated watchdog with merged RST assertion-making it optimal for complex, field-upgradable multivoltage systems where design reuse and margin testing are critical.

Availability

LTC2901-3IGN#TRPBF is available at Aetrix Electronics and suitable for desktop motherboards, industrial PLCs, telecom line cards, and portable medical devices requiring stable component supply, long-term lifecycle support, and guaranteed parametric performance across –40°C to +85°C.

Supply support for LTC2901-3IGN#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. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.

The LTC2901 family was designed by Linear Technology (acquired by ADI in 2017) specifically for high-accuracy, low-power, multi-rail power supply supervision in space-constrained systems where flexibility and reliability outweigh fixed-function simplicity.

FAQ

What is the function of the TOL pin on the LTC2901-3IGN#TRPBF?

The TOL pin on the LTC2901-3IGN#TRPBF selects between 5% and 10% undervoltage tolerance for all monitored supplies. A logic-low input configures 5% thresholds (e.g., 4.675V for 5V rail); logic-high selects 10% (e.g., 4.425V). This is implemented via internal reference scaling-no resistor changes are needed when switching modes, simplifying design validation across different operating margins.

How does the LTC2901-3IGN#TRPBF support negative voltage monitoring?

The LTC2901-3IGN#TRPBF supports negative voltage monitoring in –ADJ mode on V4 input. In this mode, VREF (1.210V) serves as the level-shift reference: an external resistor divider connects the negative supply to VREF, and the tap point feeds V4. The trip voltage is calculated as VTRIP = VREF × R3/(R3 + R4), enabling accurate detection of rails like –5V or –12V without additional components.

What is the minimum VCC required for guaranteed RST operation in the LTC2901-3IGN#TRPBF?

The LTC2901-3IGN#TRPBF guarantees correct RST output state down to VCC = 1V. This means the RST pin will assert and remain asserted (low) even as the greater of V1 or V2 drops to 1V, providing robust brownout protection for microprocessors that require reset assertion well below nominal supply levels.

Can the LTC2901-3IGN#TRPBF monitor fewer than four supplies?

Yes, the LTC2901-3IGN#TRPBF can monitor fewer than four supplies. Unused inputs (e.g., V3, V4) may be tied to GND or left floating-though tying to GND is preferred to avoid noise coupling. The device remains fully functional with one to four active inputs, and all four COMPX outputs retain individual status regardless of how many rails are actively supervised.

What is the purpose of the VREF pin on the LTC2901-3IGN#TRPBF?

The VREF pin on the LTC2901-3IGN#TRPBF provides a buffered 1.210V ±1.5% reference used for two critical functions: (1) setting the VPG divider ratio to select one of 16 voltage threshold combinations, and (2) serving as the level-shift reference in –ADJ mode for negative supply monitoring. It can source/sink up to ±1mA and drives the VPG network without external buffering.