Analog Devices Inc. LTC2914IGN-1#PBF

Overview

LTC2914IGN-1#PBF from Analog Devices (formerly Linear Technology) is a quad-input UV/OV supply monitor IC designed for simultaneous monitoring of four independent voltage rails in power management systems. It features ±1.5% threshold accuracy over temperature, 62µA quiescent current, adjustable reset timeout via external capacitor, and latching OV output. It is used in desktop/notebook computers and network servers for core/I/O rail supervision.

For engineers reviewing the LTC2914IGN-1#PBF datasheet, LTC2914IGN-1#PBF pinout, LTC2914IGN-1#PBF application, or LTC2914IGN-1#PBF equivalent, key selection factors include guaranteed OV/UV assertion at VCC ≥ 1V, support for two negative voltage monitoring channels via SEL-configurable polarity, buffered 1V reference output, open-drain UV/OV outputs with weak internal pull-ups, and compatibility with 16-lead SSOP package in –40°C to 85°C industrial temperature range.

Technical Context

The LTC2914IGN-1#PBF implements four independent comparator pairs (VHn/VLn), each generating UV or OV events based on input polarity selected by the three-state SEL pin. All comparators share a common 0.5V internal threshold referenced to a buffered 1V REF output, enabling precise ratio-based monitoring of positive or negative supplies using external resistor dividers.

Its UV/OV outputs are open-drain with weak internal pull-ups to VCC and strong active-low pull-downs; the LTC2914-1 variant includes latching OV behavior controlled by the LATCH pin, while TMR pin sets timeout delay (e.g., 8.5ms with 1nF) before UV/OV deassertion after fault clearance.

Key Specifications

Pinout & Package

Package: 16-Lead Plastic SSOP (GN), 0.150" wide, RoHS-compliant, lead-free finish. Pin pitch: 0.025", body dimensions: 5.0mm × 6.2mm × 1.75mm.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LTC2914IGN-1#PBF, the LTC2914IGN-2#PBF trades latched OV for output disable control-better for coordinated multi-supervisor systems-while the TPS3307-33DGNR offers lower cost but sacrifices quad monitoring, polarity flexibility, and micropower operation.

Availability

LTC2914IGN-1#PBF is available at Aetrix Electronics and suitable for desktop computers, network servers, and industrial embedded controllers requiring stable component supply with guaranteed –40°C to +85°C operation and long-term lifecycle support.

Supply support for LTC2914IGN-1#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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors.

The LTC2914 product line delivers precision, low-power, multi-rail voltage supervision ICs optimized for computing, communications, and industrial power systems where reliability and accuracy across temperature are critical.

FAQ

What is the operating temperature range of the LTC2914IGN-1#PBF?

The LTC2914IGN-1#PBF is rated for industrial operation from –40°C to +85°C. This is confirmed by its "IGN" suffix (I-grade, GN package) and is specified in the Absolute Maximum Ratings table. The device maintains ±1.5% threshold accuracy across this full range, making it suitable for demanding embedded and server environments where ambient temperatures fluctuate significantly.

How does the SEL pin configure negative voltage monitoring on the LTC2914IGN-1#PBF?

The SEL pin on the LTC2914IGN-1#PBF is a three-state input that selects polarity for VH3/VL3 and VH4/VL4 inputs. When grounded, both pairs monitor negative supplies: VHn triggers OV when below 0.5V (i.e., more negative), and VLn triggers UV when above 0.5V (i.e., less negative). This configuration uses the buffered 1V REF as a bias reference, enabling accurate ratio-based monitoring of rails like –5V or –12V without external op-amps.

Does the LTC2914IGN-1#PBF support latching overvoltage detection?

Yes, the LTC2914IGN-1#PBF provides latching OV detection via the LATCH pin (Pin 13). When LATCH is held low, the OV output latches low upon the first overvoltage event and remains asserted until LATCH is pulled high. This behavior is intrinsic to the "-1" variant and distinguishes it from the "-2" version, which replaces latching with output disable functionality. Latching ensures fault visibility across power cycles or resets.

What is the minimum VCC voltage required for guaranteed UV/OV assertion in the LTC2914IGN-1#PBF?

The LTC2914IGN-1#PBF guarantees UV and OV output assertion for VCC ≥ 1V. Below 2V, the device enters undervoltage lockout (UVLO), pulling UV low and blocking OV assertion. Above 2V (up to 2.1V max), the VHn/VLn comparators become fully active. This 1V operational floor enables reliable brown-out detection in systems where main supply collapses gradually.

Can the LTC2914IGN-1#PBF monitor both positive and negative voltages simultaneously?

Yes, the LTC2914IGN-1#PBF can monitor up to two negative voltages simultaneously (e.g., –5V and –12V) alongside two positive rails (e.g., 5V and 3.3V), using VH3/VL3 and VH4/VL4 with SEL = GND. The buffered 1V REF output serves as the reference for negative-rail resistor dividers, and internal polarity decoding swaps UV/OV logic accordingly. VH1/VL1 and VH2/VL2 remain configured for positive rails unless reconfigured via SEL.