Analog Devices Inc. LTC2913CDD-1#TRPBF

Overview

LTC2913CDD-1#TRPBF from Analog Devices (acquired Linear Technology) is a dual-input, latching overvoltage/undervoltage supervisor IC for precision supply monitoring in multi-rail systems. It monitors two independent voltage rails with adjustable UV/OV thresholds (±1.5% accuracy), features open-drain UV/OV outputs, 44μA quiescent current, and operates down to VCC = 1V. Used in desktop/notebook computers and network servers for core/I/O rail supervision.

For engineers reviewing the LTC2913CDD-1#TRPBF datasheet, LTC2913CDD-1#TRPBF pinout, LTC2913CDD-1#TRPBF application, or LTC2913CDD-1#TRPBF equivalent, key selection considerations include its latching OV output (LTC2913-1 variant), 10-lead DFN (3mm × 3mm) package, TMR-adjustable timeout (6–14ms), guaranteed operation at VCC ≥ 1V, and ±1.5% threshold accuracy across 0°C to 70°C.

Technical Context

The LTC2913CDD-1#TRPBF implements dual independent comparator pairs (VH1/VL1 and VH2/VL2), each detecting undervoltage (VHn < 0.5V) and overvoltage (VLn > 0.5V) conditions. All comparators share a common 0.5V internal reference and feed into a single UV output and a latched OV output.

Its timing architecture includes a programmable reset timeout (tUOTO = 6–14ms with CTMR = 1nF), glitch-filtered inputs rejecting transients below the curve in Figure 2913 G05, and a dedicated LATCH pin (Pin 8) that enables OV latching when pulled low - a defining feature of the -1 variant.

Key Specifications

Pinout & Package

Package: 10-lead (3mm × 3mm) plastic DFN with exposed pad (Pin 11, optional GND connection).

Key Features

Applications

Equivalent & Alternatives

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

Compared with LTC2913CDD-1#TRPBF, LTC2914 offers expanded channel count and negative rail capability at the cost of larger footprint and higher complexity, while LTC2904 provides smaller size and adjustable tolerance but omits latching and requires different PCB layout and timing configuration.

Availability

LTC2913CDD-1#TRPBF is available at Aetrix Electronics and suitable for desktop computers, network servers, and embedded industrial controllers requiring stable component supply with guaranteed commercial-temperature performance and long-term lifecycle support.

Supply support for LTC2913CDD-1#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) acquired Linear Technology in 2017 and maintains its high-performance analog and power management portfolio, emphasizing precision, reliability, and low-power innovation.

The LTC2913 product line delivers micropower, high-accuracy voltage supervision for multi-rail digital systems - designed specifically for computing, communications, and industrial applications demanding robust power sequencing and fault logging.

FAQ

What is the key functional difference between LTC2913CDD-1#TRPBF and LTC2913CDD-2#TRPBF?

The LTC2913CDD-1#TRPBF features a latching overvoltage (OV) output controlled by the LATCH pin: pulling LATCH low causes OV to latch low on fault detection and remain asserted until LATCH is pulled high. In contrast, LTC2913CDD-2#TRPBF replaces LATCH with a DIS (disable) pin that disables both UV and OV outputs when driven high. This makes LTC2913CDD-1#TRPBF ideal for fault-hold applications, while LTC2913CDD-2#TRPBF suits scenarios requiring output blanking during maintenance or test modes.

How does the LTC2913CDD-1#TRPBF achieve ±1.5% threshold accuracy over temperature?

The LTC2913CDD-1#TRPBF achieves ±1.5% threshold accuracy by using a trimmed, temperature-compensated 0.5V internal reference voltage applied to all four comparator inputs (VH1, VL1, VH2, VL2). This reference is laser-trimmed during production and stabilized across –40°C to 125°C, ensuring consistent trip points regardless of ambient or supply variation. The specification applies to the internal 0.5V threshold itself - external resistor divider accuracy must be considered separately for overall system tolerance.

Can LTC2913CDD-1#TRPBF monitor a 12V supply directly, and what precautions are needed?

Yes, LTC2913CDD-1#TRPBF can monitor a 12V supply, but VCC must not exceed 6V directly. To power the IC from 12V, connect it through an external current-limiting resistor (RZ) to leverage the internal 6.6V shunt regulator. For example, with 12V input and max 10mA VCC current, RZ ≈ (12V – 6.6V)/10mA = 540Ω. The resistor must also handle power dissipation (≈54mW). VH1/VL1 and VH2/VL2 inputs remain safe up to 16V, so 12V may be applied directly to them via appropriate resistor dividers.

What is the minimum recommended capacitor value for the TMR pin on LTC2913CDD-1#TRPBF, and why?

The minimum recommended capacitor value for the TMR pin on LTC2913CDD-1#TRPBF is 10pF. This value ensures sufficient charge/discharge time for reliable timeout timing generation. Capacitors smaller than 10pF risk erratic or shortened timeout periods due to parasitic capacitance dominating the timing node. The datasheet specifies CTMR ≥ 10pF to guarantee predictable tUOTO behavior across process, voltage, and temperature variations - values like 1nF (yielding ~8.5ms timeout) or 22nF (~200ms) are commonly used for practical reset durations.

Does LTC2913CDD-1#TRPBF require external pull-up resistors on UV and OV outputs?

LTC2913CDD-1#TRPBF includes weak internal pull-ups to VCC on both UV and OV outputs, eliminating the need for external pull-ups in most cases. However, an external pull-up (≤100kΩ) is recommended on OV when operating at VCC < 2V, because the internal pull-up strength diminishes significantly below this voltage. External pull-ups are also necessary for wired-OR configurations or when faster rise times are required - though doing so increases total pull-up strength, requiring stronger pull-downs from other devices sharing the net.