Analog Devices Inc. LTC2901-1IGN#TRPBF

Overview

LTC2901-1IGN#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 across four independent rails. It supports 16 voltage threshold combinations (e.g., 5V/3.3V/2.5V/1.8V), guarantees ±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 LTC2901-1IGN#TRPBF datasheet, LTC2901-1IGN#TRPBF pinout, LTC2901-1IGN#TRPBF application, or LTC2901-1IGN#TRPBF equivalent, key selection criteria include its 16-lead SSOP package, VCC ≥ 1V guaranteed RST assertion, CRT/CWT capacitor-programmable timing, ±1.5% voltage threshold tolerance, and compatibility with both positive-adjustable and negative-adjustable input configurations.

Technical Context

The LTC2901-1IGN#TRPBF implements four independent high-accuracy comparators with glitch-immune inputs, each referenced to a buffered 1.210V internal bandgap. Its programming architecture uses a resistive divider on VPG to select one of 16 preset or adjustable voltage threshold sets, with VREF serving as both reference and level-shift source for –ADJ mode.

Reset timing (tRST) and watchdog timeout (tWD) are independently set via external capacitors on CRT and CWT pins, scaling at 4.6ms/nF and 20ms/nF respectively. The open-drain RST output is weakly pulled up to V2 (6μA typical), ensuring correct logic state down to VCC = 1V, while COMP1–COMP4 provide nondelayed active-high monitoring outputs per rail.

Key Specifications

Pinout & Package

Package: 16-lead plastic narrow SSOP (GN16), 0.15mm lead pitch, JEDEC MS-013AC compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6812HEUS+T and TPS3307-33D, the LTC2901-1IGN#TRPBF delivers unique value through its four-rail coverage, ±1.5% threshold accuracy, capacitor-programmable timing, and support for both positive/negative adjustable inputs - making it the only option capable of replacing discrete solutions in complex multivoltage designs without sacrificing precision or flexibility.

Availability

LTC2901-1IGN#TRPBF 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 traceable sourcing.

Supply support for LTC2901-1IGN#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, acquired Linear Technology in 2017 to expand its power management and precision monitoring portfolio.

The LTC2901 product line was developed by Linear Technology specifically for high-accuracy, low-power multivoltage system supervision - targeting applications where rail sequencing integrity, brownout immunity, and design flexibility are critical.

FAQ

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

The VPG pin on the LTC2901-1IGN#TRPBF is the voltage threshold programming input. It accepts a resistive divider between VREF and GND to select one of 16 predefined voltage combinations (e.g., 5V/3.3V/2.5V/1.8V). The LTC2901-1IGN#TRPBF samples VPG during a ~150μs window after VCC rises above 2.4V, then configures its four comparators accordingly. No capacitance may be added to VPG to avoid programming errors.

How does the LTC2901-1IGN#TRPBF handle negative supply monitoring?

The LTC2901-1IGN#TRPBF supports negative supply monitoring via its –ADJ mode on V4. In this configuration, VREF (1.210V) serves as a level-shift reference: an external resistor divider connects between the negative supply and VREF, with the tap fed into V4. The trip voltage is calculated as VTRIP = VREF × (R3/R4), enabling accurate detection of rails like –5V or –12V. The LTC2901-1IGN#TRPBF guarantees operation with V4 as low as –18mV.

What is the minimum VCC required for valid RST assertion on the LTC2901-1IGN#TRPBF?

The LTC2901-1IGN#TRPBF guarantees correct RST logic state (active low) for VCC ≥ 1V. This ensures reliable reset generation even during deep brownout conditions before system power collapse. Below 1V, comparator outputs and RST behavior are not specified. Internal circuitry remains functional down to VCC = 1V, and the device reprograms automatically when VCC rises above 2.4V.

Can the watchdog timer on the LTC2901-1IGN#TRPBF be disabled?

Yes, the watchdog timer on the LTC2901-1IGN#TRPBF can be disabled by connecting the CWT pin (Pin 9) directly to GND. When CWT is grounded, the watchdog circuit is inhibited, and WDO remains high regardless of WDI activity. The WDI pin (Pin 8) may be left unconnected, as it has a 10μA internal pull-up; tying it to V1 or GND is also acceptable but draws continuous current if grounded.

What is the purpose of the CRT and CWT capacitors on the LTC2901-1IGN#TRPBF?

The CRT capacitor sets the reset timeout period (tRST) at 4.6ms/nF, while the CWT capacitor sets the watchdog timeout (tWD) at 20ms/nF. For example, a 47nF CRT yields tRST ≈ 216ms, and a 47nF CWT yields tWD ≈ 940ms. Both capacitors must be low-leakage types (e.g., ceramic) to maintain timing accuracy, as leakage current affects the 2μA nominal charging current. Leaving either pin open yields minimum delays (~50μs for CRT, ~200μs for CWT).