Analog Devices Inc. LTC2914CDHC-2#TRPBF

Overview

LTC2914CDHC-2#TRPBF from Analog Devices (formerly Linear Technology) is a quad-input, dual-polarity voltage supervisor IC designed for simultaneous monitoring of four independent supply rails-supporting both positive and negative voltages-with ±1.5% threshold accuracy over temperature, 62µA quiescent current, and adjustable reset timeout. It serves as the core fault-detection element in multi-rail power systems for desktop computers, network servers, and embedded computing platforms.

For engineers reviewing the LTC2914CDHC-2#TRPBF datasheet, LTC2914CDHC-2#TRPBF pinout, LTC2914CDHC-2#TRPBF application, or LTC2914CDHC-2#TRPBF equivalent, key selection criteria include its dual-polarity input configuration (via SEL pin), guaranteed UV/OV assertion at VCC ≥ 1V, open-drain UV/OV outputs with internal weak pull-ups, and DIS pin–enabled output disable functionality unique to the -2 variant.

Technical Context

The LTC2914CDHC-2#TRPBF implements four independent comparator pairs (VHn/VLn), each referencing a stable 0.5V internal threshold, with polarity programmable via the three-state SEL pin (VCC/GND/open). Its architecture supports both positive-supply monitoring (VHn triggers UV, VLn triggers OV) and negative-supply monitoring (VHn triggers OV, VLn triggers UV) without external components.

Unlike the -1 variant, the -2 version replaces the LATCH pin with DIS (Pin 13), enabling full disablement of both UV and OV outputs when pulled high-critical for controlled power sequencing and test-mode operation. The TMR pin sets a user-adjustable timeout (6–14 ms typical with 1 nF) that holds outputs asserted after fault clearance, and the buffered 1V REF output drives resistive dividers for negative rail sensing.

Key Specifications

Pinout & Package

Package: 16-lead (5 mm × 3 mm) plastic DFN with exposed pad (Pin 17), RoHS-compliant, lead-free finish, rated for 0°C to 70°C operation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad voltage monitor applications.

Compared with LTC2914IDHC-2#TRPBF, the LTC2914CDHC-2#TRPBF offers identical electrical performance but is limited to commercial temperature range; compared with TPS3808G33DBVR, it provides four independent monitoring channels, dual-polarity support, and hardware output disable-making it uniquely suited for complex multi-rail systems requiring coordinated fault response.

Availability

LTC2914CDHC-2#TRPBF is available at Aetrix Electronics and suitable for desktop computer power management, network server core voltage monitoring, and industrial embedded controller PSU applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for LTC2914CDHC-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, 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 LTC2914 product line delivers precision, low-power, multi-rail voltage supervision for mission-critical computing and communications infrastructure where reliability, accuracy, and compact integration are essential.

FAQ

What is the key functional difference between LTC2914CDHC-2#TRPBF and LTC2914CDHC-1#TRPBF?

The LTC2914CDHC-2#TRPBF features a DIS (disable) pin (Pin 13) that, when pulled high, forces both UV and OV outputs into a high-impedance state-preventing assertion regardless of input faults. In contrast, the LTC2914CDHC-1#TRPBF has a LATCH pin that enables OV output latching during overvoltage events. This makes the -2 variant ideal for test-mode operation and controlled power sequencing where temporary suppression of fault signals is required.

Can LTC2914CDHC-2#TRPBF monitor negative voltages, and how is polarity configured?

Yes, LTC2914CDHC-2#TRPBF can monitor up to two negative voltages using its VHn/VLn inputs and the three-state SEL pin. When SEL is tied to GND, V3 and V4 inputs are configured for negative monitoring: VHn triggers OV when voltage becomes more negative than threshold, and VLn triggers UV when voltage becomes less negative. The buffered 1V REF output provides the necessary offset for accurate negative-rail sensing without external components.

What is the minimum VCC voltage required for LTC2914CDHC-2#TRPBF to assert valid UV/OV outputs?

The LTC2914CDHC-2#TRPBF guarantees UV and OV output functionality down to VCC = 1V. At this level, UV asserts low and OV remains weakly pulled high. Above VCC = 2.1V (maximum UVLO hysteresis), the internal comparators fully engage and respond to input faults. This low-VCC operation ensures reliable supervision during brownout and power-fail conditions before full system initialization.

How is the reset timeout period set on LTC2914CDHC-2#TRPBF, and what is its range?

The reset timeout period on LTC2914CDHC-2#TRPBF is set by connecting an external capacitor (CTMR) between the TMR pin (Pin 15) and GND. With CTMR = 1 nF, the typical timeout is 8.5 ms (6–14 ms over temperature). The relationship is approximately linear: CTMR (nF) ≈ tUOTO (ms) / 8.5. Tying TMR to VCC bypasses the timeout entirely, causing UV/OV to release immediately upon fault clearance.

Does LTC2914CDHC-2#TRPBF require external pull-up resistors on UV and OV pins?

No external pull-up resistors are required on UV and OV pins for standard operation, as LTC2914CDHC-2#TRPBF includes internal weak pull-ups to VCC. These provide sufficient rise time for most system reset circuits. However, if fast rise time (<1 µs) or operation at very low VCC (e.g., 1V) is needed, a ≤100 kΩ external pull-up is recommended-especially on OV, where internal pull-up strength diminishes near VCC = 1V.