Analog Devices Inc. LTC2913HDD-2#TRPBF

Overview

LTC2913HDD-2#TRPBF from Analog Devices (formerly Linear Technology) is a dual-input, dual-threshold voltage monitor IC designed for simultaneous undervoltage (UV) and overvoltage (OV) supervision of two independent power rails. It features ±1.5% threshold accuracy, 44 μA quiescent current, open-drain UV/OV outputs, and a dedicated DIS pin to disable both outputs-enabling precise reset control in automotive-grade embedded systems monitoring 5V/3.3V or 12V/5V supplies.

For engineers reviewing the LTC2913HDD-2#TRPBF datasheet, LTC2913HDD-2#TRPBF pinout, LTC2913HDD-2#TRPBF application, or LTC2913HDD-2#TRPBF equivalent, this device delivers guaranteed operation down to VCC = 1 V, adjustable 6–14 ms timeout via external capacitor, glitch-immune comparator inputs, and H-grade (–40°C to +125°C) reliability for under-hood and industrial power management.

Technical Context

The LTC2913HDD-2#TRPBF implements two independent comparator pairs per monitored rail-one for VH (undervoltage detection) and one for VL (overvoltage detection)-with shared open-drain UV and OV outputs. Its internal shunt regulator enables direct operation from supplies up to 6 V or regulated operation from higher voltages (e.g., 12 V) using an external series resistor.

Unlike the LTC2913-1 variant, the -2 version replaces the LATCH pin with DIS (Pin 8), allowing full output disable during normal operation while retaining UVLO assertion at VCC < 2.1 V. Glitch filtering is achieved via integrated low-pass stages on all comparator outputs, eliminating need for external RC networks while maintaining < 500 μs delay from threshold breach to output assertion.

Key Specifications

Pinout & Package

Package: 10-lead (3 mm × 3 mm) plastic DFN with exposed pad (Pin 11, optional GND connection). RoHS-compliant, lead-free, tape-and-reel (#TRPBF).

Key Features

Applications

Equivalent & Alternatives

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

Compared with LTC2913HDD-2#TRPBF, the LTC2913HMS-2 offers identical supervision logic in a more rework-friendly package but trades thermal performance for manufacturability, while LTC2904HMS8 sacrifices output disable and fixed-threshold simplicity for programmable flexibility - making LTC2913HDD-2 optimal for production automotive and industrial designs requiring guaranteed H-grade reliability and minimal external components.

Availability

LTC2913HDD-2#TRPBF is available at Aetrix Electronics and suitable for automotive engine control units, industrial PLCs, server motherboard power management, and medical diagnostic imaging systems requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for LTC2913HDD-2#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 acquired Linear Technology in 2017 and maintains its precision analog portfolio, including high-reliability supervisors, with global manufacturing, testing, and quality systems certified to ISO 9001 and IATF 16949.

The LTC2913 product line was designed specifically for space-constrained, micropower dual-rail voltage supervision in automotive, industrial, and computing applications - emphasizing threshold accuracy, glitch immunity, and extended temperature operation without external components.

FAQ

What is the function of the DIS pin on the LTC2913HDD-2#TRPBF?

The DIS (Disable) pin on the LTC2913HDD-2#TRPBF is a dedicated input that forces both UV and OV outputs into a high-impedance state (weakly pulled high) when driven high, effectively disabling fault signaling during normal operation. This feature enables precise control over reset assertion timing - for example, during firmware updates or power sequencing phases. The DIS pin has an internal 2 μA pull-down, so it defaults to active monitoring when left unconnected. During VCC undervoltage lockout (UVLO), UV still asserts low regardless of DIS state.

Can the LTC2913HDD-2#TRPBF monitor negative voltages?

No, the LTC2913HDD-2#TRPBF is designed exclusively for positive voltage monitoring. Its VHn and VLn inputs operate with a fixed 0.5 V internal reference and accept input voltages from –0.3 V to +7.5 V, but the architecture assumes positive rails referenced to GND. For negative supply monitoring, Analog Devices offers the LTC2909 or LTC2914, which include dedicated negative-input circuitry and separate reference paths. Attempting to monitor negative voltages with LTC2913HDD-2#TRPBF will result in incorrect or undefined behavior.

What is the minimum VCC voltage required for valid UV/OV output assertion in the LTC2913HDD-2#TRPBF?

The LTC2913HDD-2#TRPBF guarantees valid UV and OV output assertion down to VCC = 1 V, as specified in the Electrical Characteristics table under "VCCR(MIN) Minimum VCC Output Valid". At this voltage, the UV output can sink 100 μA while maintaining VOL ≤ 0.15 V, ensuring reliable logic-level signaling to downstream reset controllers. Below 1 V, output behavior is not characterized. Note that full comparator functionality (i.e., accurate threshold comparison) requires VCC ≥ 2.3 V, and UVLO activates at VCC < 2.1 V.

How does the TMR pin set the timeout period on the LTC2913HDD-2#TRPBF?

The TMR pin on the LTC2913HDD-2#TRPBF sets the UV/OV timeout period by connecting an external capacitor (CTMR) between TMR and GND. The timeout is linearly proportional to capacitance: tUOTO ≈ 9 ms/nF (e.g., 1 nF yields ~8.5 ms). The internal timer charges CTMR with a constant current, and the resulting voltage ramp determines delay duration. CTMR must be ≥10 pF; tying TMR directly to VCC bypasses the timer entirely, causing immediate output deassertion after fault clearance. Leakage current in CTMR must stay below 1.3 μA to avoid timing errors.

Is the LTC2913HDD-2#TRPBF pin-compatible with the LTC2913HDD-1#TRPBF?

No, the LTC2913HDD-2#TRPBF is not pin-compatible with the LTC2913HDD-1#TRPBF. While both share the same DFN-10 package and pin 1–7/9–10 assignments, Pin 8 differs functionally: LTC2913HDD-1 uses it as LATCH (OV latch clear/bypass), whereas LTC2913HDD-2 uses it as DIS (output disable). Swapping them without circuit modification will cause incorrect or nonfunctional behavior - e.g., applying a logic high to Pin 8 of LTC2913HDD-1 may inadvertently clear the OV latch instead of disabling outputs. Board layout must match the specific variant.