Analog Devices Inc. LT1764AET-1.8#PBF

Overview

LT1764AET-1.8#PBF from Analog Devices (formerly Linear Technology) is a 3A, low-noise, fast-transient-response LDO regulator with fixed 1.8V output, 340mV dropout at full load, and 40µVRMS noise (10Hz–100kHz). It operates from 2.7V to 20V input and delivers stable power for RF-sensitive circuits, FPGA core supplies, and high-efficiency post-regulation in telecom infrastructure.

For engineers reviewing the LT1764AET-1.8#PBF datasheet, LT1764AET-1.8#PBF pinout, LT1764AET-1.8#PBF application, or LT1764AET-1.8#PBF equivalent, key selection criteria include guaranteed dropout voltage at 3A, quiescent current control in dropout, reverse battery protection, ceramic capacitor stability, and Kelvin sense capability for precision load regulation.

Technical Context

The LT1764AET-1.8#PBF employs a proprietary error amplifier architecture optimized for sub-10µs transient response under 3A load steps, with controlled quiescent current that remains flat across dropout-unlike conventional LDOs. Its internal reference is trimmed to ±1.8% over temperature and load, enabling tight output regulation without external components.

It integrates reverse-battery protection, thermal limiting, current limiting, and reverse-current blocking. The SENSE pin enables remote sensing for <±5mV load regulation error, while shutdown draws <1µA and features hysteresis with 0.25V–0.75V turn-off threshold.

Key Specifications

Pinout & Package

LT1764AET-1.8#PBF is housed in a 5-lead plastic DD package (TO-220 compatible outline) with exposed GND tab for thermal dissipation. Pin 1 = SHDN, Pin 2 = IN, Pin 3 = GND, Pin 4 = OUT, Pin 5 = SENSE (not ADJ-fixed-output variant).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar LDO regulator applications.

Compared with TPS7A8300RGRT and MCP1826T-1802E/DB, the LT1764AET-1.8#PBF uniquely combines 3A capability, 40µVRMS noise, SENSE-based precision regulation, and integrated reverse-battery protection-making it the only option qualified for high-reliability RF and battery-critical embedded systems.

Availability

LT1764AET-1.8#PBF is available at Aetrix Electronics and suitable for FPGA core supplies, RF transceiver biasing, and battery-powered IoT nodes requiring stable component supply, long-lifecycle support, and guaranteed parametric performance across –40°C to 125°C.

Supply support for LT1764AET-1.8#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 (acquired Linear Technology in 2017) designs precision analog, mixed-signal, and power management ICs for high-performance industrial, automotive, and communications systems.

The LT1764A series was developed specifically for high-current, low-noise, fast-transient LDO applications in RF infrastructure, test equipment, and battery-backed systems-emphasizing reliability under dynamic load and harsh input conditions.

FAQ

What is the maximum input voltage rating for the LT1764AET-1.8#PBF?

The LT1764AET-1.8#PBF has an absolute maximum IN pin voltage of ±20V. However, its functional operating range is 2.7V to 20V. Exceeding 20V on the IN pin-even briefly-may cause permanent damage. For robust design, maintain VIN ≤19V with appropriate derating margins, especially in automotive or industrial environments with load-dump transients.

Does the LT1764AET-1.8#PBF require an external capacitor on the SENSE pin?

No, the LT1764AET-1.8#PBF does not require an external capacitor on the SENSE pin. The SENSE pin is a high-impedance error amplifier input with 600µA bias current at nominal output voltage. It should be routed as a dedicated low-noise, low-impedance trace directly to the load point or to the OUT pin for local regulation. Adding capacitance risks instability and is not recommended per the datasheet.

Can the LT1764AET-1.8#PBF be used with ceramic output capacitors below 10µF?

No-the LT1764AET-1.8#PBF requires a minimum 10µF output capacitor for guaranteed stability across all operating conditions. Using <10µF ceramics may cause oscillation or poor transient response. The datasheet explicitly specifies "stable with 10µF output capacitor" and validates performance down to 10µF for ceramic, tantalum, and aluminum types. Derating below this value voids stability guarantees.

What is the thermal resistance (θJA) of the LT1764AET-1.8#PBF in its DD package?

The LT1764AET-1.8#PBF in the 5-lead plastic DD package has a junction-to-ambient thermal resistance (θJA) of 50°C/W when mounted on a standard 2-layer PCB with 1in² copper pad connected to the exposed GND tab. This value assumes no forced airflow. With proper thermal vias and larger copper areas, θJA can improve to ~35°C/W-critical for sustaining 3A continuous output at elevated ambient temperatures.

Is the LT1764AET-1.8#PBF RoHS compliant and lead-free?

Yes, the LT1764AET-1.8#PBF is RoHS compliant and lead-free. The "#PBF" suffix explicitly denotes lead-free packaging per JEDEC J-STD-609. It uses matte tin (Sn) lead finish and meets EU RoHS Directive 2011/65/EU and China RoHS II requirements. Full compliance documentation-including material declarations and test reports-is available from Analog Devices' product page for LT1764AET-1.8#PBF.