Analog Devices Inc. LTC2901-2IGN#PBF

Overview

LTC2901-2IGN#PBF from Analog Devices (acquired Linear Technology) is a programmable quad supply monitor IC with push-pull RST output, adjustable reset and watchdog timers, ±1.5% voltage threshold accuracy over temperature, and 43μA typical supply current. It simultaneously monitors four independent supply rails (e.g., 5V, 3.3V, 2.5V, 1.8V) in multivoltage systems and asserts a reliable reset signal during power-up, brownout, or undervoltage events.

For engineers reviewing the LTC2901-2IGN#PBF datasheet, LTC2901-2IGN#PBF pinout, LTC2901-2IGN#PBF application, or LTC2901-2IGN#PBF equivalent, key selection criteria include its push-pull RST output architecture, 16-pin narrow SSOP package, programmable voltage threshold combinations via VPG resistor divider, guaranteed RST operation down to VCC = 1V, and compatibility with industrial temperature range (–40°C to 85°C).

Technical Context

The LTC2901-2IGN#PBF implements four independent high-accuracy comparators referenced to a buffered 1.210V internal bandgap, with thresholds set via external resistor programming on VPG. Its reset timing (tRST) and watchdog timeout (tWD) are capacitor-programmable using CRT and CWT pins, respectively, enabling precise system-level coordination with microprocessor boot sequences and software execution windows.

Unlike open-drain variants (LTC2901-1/LTC2901-3), the LTC2901-2IGN#PBF features an actively driven push-pull RST output referenced to V2, eliminating external pull-up requirements and ensuring fast, deterministic VOH (≥0.8•V2) and VOL (≤0.4V at 2.5mA sink) under all valid operating conditions.

Key Specifications

Pinout & Package

Package: 16-lead narrow plastic SSOP (GN16), 0.15mm max height, 0.65mm pitch, RoHS-compliant lead-free finish (#PBF).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6816ESE+ and TPS3307-33DGNR, the LTC2901-2IGN#PBF offers unique value through its 16-programmable threshold combinations, independent capacitor-tuned reset and watchdog periods, and guaranteed 1V operation - making it the only option capable of replacing both alternatives in complex multivoltage designs requiring field-upgradable supervision profiles.

Availability

LTC2901-2IGN#PBF is available at Aetrix Electronics and suitable for desktop computers, telecom equipment, and network servers requiring stable component supply, long-term lifecycle support, and guaranteed industrial temperature range performance.

Supply support for LTC2901-2IGN#PBF 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 technologies, serving industrial, automotive, communications, and healthcare markets.

The LTC2901 product line was originally developed by Linear Technology (acquired by ADI in 2017) to address demanding power-supervision requirements in high-reliability multivoltage systems, emphasizing accuracy, flexibility, and robustness over temperature and supply variation.

FAQ

What is the maximum supply voltage that can be monitored by the LTC2901-2IGN#PBF?

The LTC2901-2IGN#PBF supports input voltage monitoring from –0.3V to 7V on all V1–V4 pins. This range accommodates standard positive rails (5V, 3.3V, 2.5V, 1.8V), adjustable positive supplies via resistor dividers, and negative supplies (e.g., –48V, –12V) using the –ADJ mode with VREF-referenced dividers. The absolute maximum rating ensures safe operation even during transient overvoltage events.

How does the push-pull RST output of the LTC2901-2IGN#PBF differ from the open-drain version?

The LTC2901-2IGN#PBF's push-pull RST output actively drives high to V2 (not just weakly pulled up), delivering VOH ≥ 0.8•V2 at 200μA source current. This eliminates the need for an external pull-up resistor, reduces rise time to ~206ns (vs >80μs for open-drain), and guarantees defined logic states during VCC ramp-up below 2.4V - a key advantage over LTC2901-1/LTC2901-3 variants.

Can the LTC2901-2IGN#PBF monitor negative supply voltages?

Yes, the LTC2901-2IGN#PBF supports negative supply monitoring in –ADJ mode on V4. In this configuration, an external resistor divider connects between the negative supply and VREF (1.21V), with the tap applied to V4. The internal comparator references V4 to ground, enabling accurate trip-point detection (e.g., –1.87V, –4.64V) using standard 1% resistors as specified in Table 3 of the datasheet.

What is the minimum VCC required for the LTC2901-2IGN#PBF to assert a valid RST signal?

The LTC2901-2IGN#PBF guarantees correct RST and COMPX logic states for VCC ≥ 1V. This means the device will assert a valid active-low reset signal even during deep brownout conditions where V1 or V2 drops to 1V - a critical feature for fail-safe operation in systems with asymmetric supply collapse or unregulated backup rails.

How do I configure the LTC2901-2IGN#PBF to monitor 5V, 3.3V, 2.5V, and 1.8V simultaneously?

To monitor 5V, 3.3V, 2.5V, and 1.8V, configure the VPG pin using the resistor divider values from Table 1, row 6: R1 = 59.0kΩ, R2 = 40.2kΩ (1% tolerance), connected between VREF and GND, with the tap to VPG. This selects the preset combination where V1 = 5V, V2 = 3.3V, V3 = 2.5V, V4 = 1.8V - all thresholds accurate to ±1.5% over temperature without additional calibration.