Analog Devices Inc. LTC2901-4CGN#TRPBF

Overview

LTC2901-4CGN#TRPBF from Analog Devices (acquired Linear Technology) is a programmable quad supply monitor IC with push-pull RST output, 16 selectable voltage threshold combinations (including 5V/3.3V/2.5V/1.8V/1.5V/±Adj), ±1.5% threshold accuracy over temperature, 5%/10% undervoltage tolerance selection via TOL pin, and adjustable reset/watchdog timing via external capacitors. It serves as a system-level power supervisor in multivoltage embedded systems requiring reliable brownout detection and watchdog-triggered reset.

For engineers reviewing the LTC2901-4CGN#TRPBF datasheet, LTC2901-4CGN#TRPBF pinout, LTC2901-4CGN#TRPBF application, or LTC2901-4CGN#TRPBF equivalent, key selection criteria include its push-pull RST output (vs open-drain variants), TOL-pin-controlled 10% monitoring mode, guaranteed RST assertion down to VCC = 1V, 43μA typical supply current, and compatibility with 16-lead narrow SSOP layout.

Technical Context

The LTC2901-4CGN#TRPBF implements four independent high-accuracy comparators with glitch-immune inputs, each tied to a dedicated COMPx output and jointly driving a single RST output. Its internal bandgap reference (1.210V ±1.5%) enables precise threshold generation across all 16 programmable combinations selected via VPG resistive divider.

Reset timing (tRST = 4.6ms/nF on CRT pin) and watchdog timeout (tWD = 20ms/nF on CWT pin) are capacitor-programmable; the TOL pin selects between 5% and 10% undervoltage thresholds, and the push-pull RST output actively drives high to V2 (not just weak pull-up), ensuring fast, rail-to-rail reset release without external components.

Key Specifications

Pinout & Package

Package: 16-lead plastic narrow SSOP (GN16), 5.0mm × 6.2mm body, 0.635mm nominal height, exposed pad not present.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LTC2901-4IGN#TRPBF, the LTC2901-4CGN#TRPBF trades extended temperature capability for lower cost and qualification in commercial environments; versus TPS3431DBVR, it delivers full quad monitoring, 16-mode programming, and integrated watchdog-to-RST assertion - making it irreplaceable for complex, field-upgradable multivoltage systems.

Availability

LTC2901-4CGN#TRPBF is available at Aetrix Electronics and suitable for desktop computers, network servers, and portable battery-powered equipment requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for LTC2901-4CGN#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, formed through the acquisition of Linear Technology in 2017.

The LTC2901 product line was originally developed by Linear Technology to address precision, low-power, multivoltage system supervision in computing, telecom, and industrial applications - emphasizing programmability, accuracy, and robustness under brownout conditions.

FAQ

What is the function of the TOL pin on the LTC2901-4CGN#TRPBF?

The TOL pin on the LTC2901-4CGN#TRPBF is a digital input that selects the undervoltage tolerance mode: logic high configures 10% threshold deviation (e.g., 4.5V for a 5V rail), while logic low selects 5% (e.g., 4.75V). This feature enables in-system margin testing and adaptive fault sensitivity without hardware changes. The LTC2901-4CGN#TRPBF requires no external pull-up/down on TOL, as its input leakage is ±0.1μA.

How does the push-pull RST output of the LTC2901-4CGN#TRPBF differ from open-drain variants like the LTC2901-3CGN#TRPBF?

The LTC2901-4CGN#TRPBF features a push-pull RST output that actively drives high to V2 (not just weak pull-up), delivering faster rise times (~206ns with 150pF load) and eliminating the need for an external pull-up resistor. In contrast, the LTC2901-3CGN#TRPBF uses an open-drain RST requiring external pull-up, increasing BOM count and slowing release. This makes the LTC2901-4CGN#TRPBF preferable for noise-sensitive or high-speed reset release applications.

Can the LTC2901-4CGN#TRPBF monitor negative supply voltages?

Yes - the LTC2901-4CGN#TRPBF supports negative supply monitoring in –ADJ mode on the V4 input. When configured this way, the inverting input of the V4 comparator connects to ground, and an external resistive divider between the negative rail and VREF (1.210V) sets the trip point. For example, a –5V rail with R3 = 464kΩ and R4 = 121kΩ yields a –4.64V threshold. The LTC2901-4CGN#TRPBF guarantees accurate operation with V4 as low as –18mV in this mode.

What is the minimum VCC required for the LTC2901-4CGN#TRPBF to assert a valid RST signal?

The LTC2901-4CGN#TRPBF guarantees correct RST and COMPx logic states for VCC ≥ 1V, meaning it will assert a valid active-low reset even as the supply collapses. This is critical for preventing processor latch-up during brownout. The device achieves this via internal circuitry that remains functional down to 1V, unlike many supervisors requiring ≥ 2.7V. The LTC2901-4CGN#TRPBF also ensures RST remains low until VCC rises above 2.42V during power-up programming.

How do I calculate the CRT and CWT capacitor values for custom reset and watchdog timeouts on the LTC2901-4CGN#TRPBF?

For the LTC2901-4CGN#TRPBF, use CRT (Farads) = tRST (seconds) × 217 × 10⁻⁹ - e.g., 100ms requires 21.7nF. For CWT, use CWT (Farads) = tWD (seconds) × 50 × 10⁻⁹ - e.g., 500ms requires 25nF. Both capacitors connect from pin to GND; ceramic types with low leakage (<10nA) are recommended. Leaving CRT or CWT unconnected yields ~50μs or ~200μs minimum delays, respectively. The LTC2901-4CGN#TRPBF datasheet specifies these scaling factors as fixed device constants.