Analog Devices Inc. LTC2901-2CGN#TRPBF

Overview

LTC2901-2CGN#TRPBF from Analog Devices (formerly Linear Technology) is a programmable quad supply monitor IC with push-pull RST output, adjustable reset and watchdog timers, and ±1.5% voltage threshold accuracy over temperature. It simultaneously monitors four independent supply rails (e.g., 5V, 3.3V, 2.5V, 1.8V), supports ADJ/–ADJ modes for custom thresholds, and guarantees RST assertion down to VCC ≥ 1V. Used in multivoltage embedded systems requiring reliable power sequencing and microcontroller supervision.

For engineers reviewing the LTC2901-2CGN#TRPBF datasheet, LTC2901-2CGN#TRPBF pinout, LTC2901-2CGN#TRPBF application, or LTC2901-2CGN#TRPBF equivalent, key selection criteria include its push-pull RST output (vs open-drain variants), 43μA quiescent current, 16-pin narrow SSOP package, 5% or 10% undervoltage tolerance (LTC2901-3/4 only), and compatibility with external CRT/CWT capacitors for precise timing control.

Technical Context

The LTC2901-2CGN#TRPBF implements four independent high-accuracy comparators with glitch-immune inputs, each tied to a dedicated COMPX output. Its internal bandgap reference (1.210V ±1.5%) enables precise threshold programming via a resistor divider on VPG, selecting one of 16 predefined voltage combinations across V1–V4.

Reset timing is set by an external capacitor on CRT (4.6 ms/nF), while watchdog timeout is configured via CWT (20 ms/nF). The push-pull RST output actively drives high to V2 (not weak pull-up), ensuring fast, low-impedance release without external components - a critical distinction from LTC2901-1/LTC2901-3 variants.

Key Specifications

Pinout & Package

Package: 16-lead narrow plastic SSOP (GN16), 0.15 mm pitch, RoHS-compliant, lead-free (#TRPBF).

Key Features

Applications

Equivalent & Alternatives

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

Compared with LTC2901-2IGN#TRPBF, the LTC2901-2CGN#TRPBF offers identical performance at lower cost for commercial-temperature applications, while the TPS3307-33DGNR sacrifices channel count, programmability, and accuracy for simpler integration in basic triple-rail designs.

Availability

LTC2901-2CGN#TRPBF is available at Aetrix Electronics and suitable for desktop computers, industrial PLCs, and telecom line cards requiring stable component supply, precise multi-rail supervision, and long-term lifecycle support.

Supply support for LTC2901-2CGN#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 power management semiconductors.

The LTC2901 family was designed specifically for high-accuracy, low-power, programmable multi-rail power supervision in space-constrained embedded systems - emphasizing threshold precision, glitch immunity, and flexible timing.

FAQ

What is the RST output configuration of the LTC2901-2CGN#TRPBF?

The LTC2901-2CGN#TRPBF features a push-pull RST output, meaning it actively drives high to V2 (not weak pull-up) and low to GND. This eliminates the need for an external pull-up resistor and ensures fast, deterministic reset release - a key differentiator from the open-drain RST used in LTC2901-1/LTC2901-3 variants. The LTC2901-2CGN#TRPBF RST output is guaranteed functional down to VCC = 1 V.

How do I program voltage thresholds for the LTC2901-2CGN#TRPBF?

Voltage thresholds for the LTC2901-2CGN#TRPBF are programmed using a 1% resistor divider between VREF (Pin 12) and GND, with the tap connected to VPG (Pin 11). Table 1 in the datasheet specifies exact R1/R2 values for all 16 combinations (e.g., 5V/3.3V/2.5V/1.8V uses R1 = 59.0 kΩ, R2 = 40.2 kΩ). The LTC2901-2CGN#TRPBF samples VPG during a 150 μs window after VCC rises above 2.4 V, so no capacitance may be added to VPG.

Can the LTC2901-2CGN#TRPBF monitor negative supply voltages?

Yes, the LTC2901-2CGN#TRPBF supports negative rail monitoring in –ADJ mode on V4 (Pin 13). In this configuration, VREF (1.21 V) serves as the level-shift reference: an external resistor divider connects between the negative supply and VREF, with the tap fed into V4. The trip point is calculated as V_TRIP = V_REF × R4/(R3 + R4), enabling accurate detection of –1.8 V, –5 V, or other negative rails - confirmed in the –ADJ section of the datasheet.

What is the minimum VCC required for reliable operation of the LTC2901-2CGN#TRPBF?

The LTC2901-2CGN#TRPBF guarantees correct RST and COMPX logic states for VCC ≥ 1 V, as specified in the Electrical Characteristics table under "VCC Minimum Internal Operating Voltage". This ensures robust brownout detection and reset assertion even during severe supply collapse. Note that programming requires VCC ≥ 2.42 V (VCCMINP), and comparator operation begins at VCC ≥ 2.32 V (VCCMINC).

How do CRT and CWT capacitors affect timing in the LTC2901-2CGN#TRPBF?

In the LTC2901-2CGN#TRPBF, CRT (Pin 5) sets the reset timeout period at 4.6 ms/nF (e.g., 47 nF → 216 ms), while CWT (Pin 9) sets the watchdog timeout at 20 ms/nF (e.g., 47 nF → 940 ms). Both capacitors connect from their respective pins to GND. Leaving either pin open yields minimum delays (~50 μs for CRT, ~200 μs for CWT). Low-leakage ceramic capacitors are recommended to maintain timing accuracy, as leakage current affects the internal 2 μA charging source.