Analog Devices Inc. LTC2901-1CGN#TRPBF

Overview

LTC2901-1CGN#TRPBF from Analog Devices (formerly Linear Technology) is a programmable quad supply monitor IC with adjustable reset and watchdog timers, designed for multivoltage systems requiring precise undervoltage detection on four independent rails. It supports 16 voltage threshold combinations (e.g., 5V/3.3V/2.5V/1.8V), delivers ±1.5% threshold accuracy over temperature, features open-drain RST output, and draws only 43μA typical supply current - enabling reliable power sequencing in desktop computers and telecom equipment.

For engineers reviewing the LTC2901-1CGN#TRPBF datasheet, LTC2901-1CGN#TRPBF pinout, LTC2901-1CGN#TRPBF application, or LTC2901-1CGN#TRPBF equivalent, key selection criteria include its 16-lead SSOP package, VCC ≥ 1V guaranteed RST operation, CRT/CWT capacitor-programmable timing, ±1.5% voltage threshold tolerance, and support for both positive and negative adjustable monitoring modes.

Technical Context

The LTC2901-1CGN#TRPBF implements four independent high-accuracy comparators with glitch-immune inputs, each tied to a dedicated COMPx output and jointly driving an open-drain RST signal. Its internal bandgap reference (1.210V ±1.5%) feeds a programmable resistive divider network via the VPG pin, selecting one of 16 preset or adjustable threshold sets - including ±Adj modes for custom and negative rail monitoring.

Reset delay (tRST) and watchdog timeout (tWD) are independently set using external capacitors on CRT and CWT pins (4.6ms/nF and 20ms/nF scaling, respectively). The device guarantees correct RST logic state down to VCC = 1V and supports power-up/power-down sequencing with nondelayed comparator outputs and robust brownout response.

Key Specifications

Pinout & Package

Package: 16-lead narrow plastic SSOP (GN16), 0.15mm max height, JEDEC MS-013AC compliant, 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 TPS3307-18DGNR, the LTC2901-1CGN#TRPBF uniquely supports four programmable rails, ±Adj sensing, capacitor-adjustable timing, and integrated watchdog - making it the only option for complex multivoltage systems requiring field-configurable supervision.

Availability

LTC2901-1CGN#TRPBF is available at Aetrix Electronics and suitable for desktop computers, telecom line cards, network servers, and portable medical devices requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant sourcing.

Supply support for LTC2901-1CGN#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 developed by Linear Technology (acquired by ADI in 2017) to address precision power-supply monitoring in multirail systems - emphasizing threshold accuracy, low IQ, flexible configuration, and robust timing control for mission-critical applications.

FAQ

What is the function of the VPG pin on the LTC2901-1CGN#TRPBF?

The VPG pin on the LTC2901-1CGN#TRPBF is the voltage threshold programming input. It accepts a resistive divider tap between VREF (Pin 12) and GND to select one of 16 predefined voltage combinations for V1–V4. For example, a 59.0kΩ/40.2kΩ divider yields the 5V/3.3V/2.5V/1.8V configuration. No capacitance may be added to VPG, as it is sampled once during a ~150μs window after power-up.

Does the LTC2901-1CGN#TRPBF support monitoring negative voltage rails?

Yes, the LTC2901-1CGN#TRPBF supports negative rail monitoring via its –ADJ mode on V4 (Pin 13). In this mode, an external resistive divider connects between the negative supply and VREF (1.21V), with the tap fed into V4. The internal comparator references 0V, enabling accurate trip-point setting - e.g., –48V detection using R3 = 464kΩ and R4 = 121kΩ per Table 3.

How is the reset timeout period set on the LTC2901-1CGN#TRPBF?

The reset timeout period on the LTC2901-1CGN#TRPBF is set by connecting an external capacitor (CRT) from Pin 5 (CRT) to GND. The relationship is linear: tRST = 4.6ms × CRT(nF). A 47nF capacitor yields 216ms, matching typical microprocessor initialization windows. Leaving CRT open gives ~50μs minimum; ceramic capacitors with low leakage are recommended for timing accuracy.

What is the difference between the LTC2901-1CGN#TRPBF and LTC2901-2CGN#TRPBF?

The LTC2901-1CGN#TRPBF features an open-drain RST output with weak internal pull-up to V2, while the LTC2901-2CGN#TRPBF uses an active push-pull RST output driven to V2. Both share identical monitoring, programming, and watchdog functionality. The choice depends on system-level requirements: open-drain allows wired-OR reset buses and level shifting; push-pull eliminates external pull-ups for faster rise times.

Can the LTC2901-1CGN#TRPBF monitor fewer than four supplies?

Yes, the LTC2901-1CGN#TRPBF can monitor fewer than four supplies. Unused inputs (e.g., V3 or V4) may be tied to a valid voltage within the –0.3V to 7V absolute maximum rating - such as connecting V3 to V2 - without affecting comparator operation on active rails. The device does not require all four inputs to be monitored, simplifying design reuse across varying rail counts.