Analog Devices Inc. LTC2914CDHC-2#PBF

Overview

LTC2914CDHC-2#PBF from Analog Devices (formerly Linear Technology) is a quad-input, adjustable UV/OV supply monitor IC for simultaneous monitoring of four independent voltage rails-supporting both positive and negative supplies via polarity-selectable inputs, ±1.5% threshold accuracy over temperature, 62 µA quiescent current, and open-drain UV/OV outputs with adjustable timeout. It is used in desktop/notebook computers and network servers for core/I/O rail supervision.

For engineers reviewing the LTC2914CDHC-2#PBF datasheet, LTC2914CDHC-2#PBF pinout, LTC2914CDHC-2#PBF application, or LTC2914CDHC-2#PBF equivalent, key selection considerations include its dual-polarity input capability (via SEL pin), DIS-enabled output disable functionality, guaranteed operation down to VCC = 1 V, and DFN-16 (5 mm × 3 mm) package compatibility with space-constrained power management layouts.

Technical Context

The LTC2914CDHC-2#PBF implements four independent comparator pairs (VHn/VLn), each referencing a stable 1 V buffered internal reference. Its three-state SEL pin configures polarity for inputs 3 and 4-enabling positive- or negative-supply monitoring without external components. The DIS pin (Pin 13) disables both UV and OV outputs when pulled high, distinguishing it from the latching LTC2914-1 variant.

Threshold detection uses a fixed 500 mV comparator trip point, scaled by external resistor dividers on each input pair. Glitch rejection is achieved via internal low-pass filtering at each comparator output, and reset timing is controlled by an external capacitor on the TMR pin (9 ms/nF typical). All monitors share common open-drain UV and OV outputs with weak internal pull-ups to VCC.

Key Specifications

Pinout & Package

Package: 16-lead plastic DFN (5 mm × 3 mm), exposed pad (Pin 17), RoHS-compliant, lead-free finish.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LTC2914IDHC-2#PBF, the LTC2914CDHC-2#PBF offers identical electrical performance but is rated only for 0°C to 70°C operation; compared with TPS3307-33DGNR, it provides full quad UV/OV coverage, negative rail capability, and output disable-making it uniquely suited for complex, thermally constrained server and computing applications.

Availability

LTC2914CDHC-2#PBF is available at Aetrix Electronics and suitable for desktop computers, notebook systems, and network servers requiring stable component supply, long-term BOM continuity, and RoHS-compliant DFN packaging.

Supply support for LTC2914CDHC-2#PBF 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 ICs designed specifically for computing, data center, and industrial power integrity applications where reliability, accuracy, and space efficiency are critical.

FAQ

What is the operating temperature range for the LTC2914CDHC-2#PBF?

The LTC2914CDHC-2#PBF is specified for operation from 0°C to 70°C (commercial grade). This range is confirmed in the Absolute Maximum Ratings table and Order Information section of the official datasheet. It is distinct from the I-grade (–40°C to 85°C) and H-grade (–40°C to 125°C) variants, which carry different part number suffixes. Thermal derating is not required within this envelope.

How does the DIS pin function on the LTC2914CDHC-2#PBF?

The DIS (Disable) pin on the LTC2914CDHC-2#PBF is an active-high control that forces both UV and OV outputs into a high-impedance state when pulled above 1.2 V. When DIS is left open, its internal 2 µA pull-down holds it low, enabling normal monitoring. This feature allows firmware or system logic to temporarily suppress reset assertions during diagnostics or hot-plug events without altering the monitored voltages.

Can the LTC2914CDHC-2#PBF monitor negative supply voltages?

Yes, the LTC2914CDHC-2#PBF can monitor up to two negative supply voltages using its VH3/VL3 and VH4/VL4 inputs in conjunction with the buffered 1 V REF output. The SEL pin configures polarity: when SEL = GND, both V3 and V4 inputs are set for negative monitoring, where VHn triggers OV and VLn triggers UV for voltages more or less negative than the threshold. This is explicitly supported in the Pin Functions and Applications Information sections.

What is the purpose of the TMR pin on the LTC2914CDHC-2#PBF?

The TMR (Timer) pin on the LTC2914CDHC-2#PBF sets the reset timeout period via an external capacitor to GND. With CTMR = 1 nF, the typical timeout is 8.5 ms; the relationship is ~9 ms/nF. Tying TMR to VCC bypasses the timeout entirely, causing UV/OV to deassert immediately after all faults clear. This pin enables precise control over minimum reset pulse width to accommodate slow-ramping power supplies or downstream logic settling times.

Does the LTC2914CDHC-2#PBF require external pull-up resistors on UV and OV outputs?

The LTC2914CDHC-2#PBF includes weak internal pull-up resistors (~400 kΩ) to VCC on both UV and OV pins, eliminating the need for external pull-ups in most applications. However, at VCC < 1.5 V, the internal pull-up strength diminishes significantly; for robust high-level assertion under ultra-low-VCC conditions (e.g., brown-out), a ≤100 kΩ external pull-up is recommended - especially on OV, as noted in the Electrical Characteristics and Applications Information sections.