Analog Devices Inc. LT1764AET-1.8#30PBF

Overview

LT1764AET-1.8#30PBF 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, 40µVRMS output noise (10Hz–100kHz), and 1mA quiescent current - designed for powering noise-sensitive RF circuits and high-speed digital logic in battery-powered systems.

For engineers reviewing the LT1764AET-1.8#30PBF datasheet, LT1764AET-1.8#30PBF pinout, LT1764AET-1.8#30PBF application, or LT1764AET-1.8#30PBF equivalent, key selection criteria include guaranteed 3A output with controlled quiescent current in dropout, Kelvin-sense capability for precision regulation, reverse-battery protection, and stability with ≥10µF ceramic or tantalum output capacitors.

Technical Context

The LT1764AET-1.8#30PBF employs a proprietary error amplifier architecture optimized for sub-10µs transient response to 1A load steps, with internal frequency compensation enabling stable operation across wide output capacitance ranges (10µF–100µF) and ESR values (0–3Ω). Its SENSE pin supports remote voltage sensing to compensate for PCB trace IR drop.

It integrates reverse-battery protection, thermal limiting, current limiting (≥3.1A), and reverse-output-current blocking (<1.2mA at 1.8V), eliminating external diodes. Shutdown mode draws <1µA, with SHDN threshold of 0.25V–2V and controlled quiescent current behavior across input voltage and temperature (–40°C to 125°C).

Key Specifications

Pinout & Package

LT1764AET-1.8#30PBF is housed in a 5-lead plastic DD package (TO-220 compatible outline) with exposed tab electrically connected to GND for thermal dissipation and EMI reduction.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LT1764AET-1.8#30PBF, TPS7A8300RGRT offers superior noise and dropout but increases standby power by 1.5mA, while MCP1826T-1802E/DB trades 250mV higher dropout and 25µVRMS more noise for 85% lower quiescent current - making each optimal for distinct trade-off priorities in power-sensitive or noise-critical designs.

Availability

LT1764AET-1.8#30PBF is available at Aetrix Electronics and suitable for RF transceiver power supplies, FPGA core rails, battery-powered medical sensors, and automotive ADAS camera modules requiring stable component supply with full traceability and long-term lifecycle support.

Supply support for LT1764AET-1.8#30PBF 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) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving precision instrumentation, communications, and industrial markets.

The LT1764A series was engineered specifically for high-current, low-noise, fast-transient LDO applications in battery-powered and RF-intensive systems - emphasizing dropout efficiency, noise immunity, and integrated protection without external components.

FAQ

What is the minimum input voltage required for LT1764AET-1.8#30PBF to regulate 1.8V at 3A?

The LT1764AET-1.8#30PBF requires a minimum input voltage of 2.14V at 3A load (1.8V + 340mV dropout). Per datasheet specifications, the guaranteed minimum input is 2.3V for E-grade operation at 3A, ensuring reliable regulation across –40°C to +125°C ambient conditions. Below this, output voltage collapses linearly per dropout characteristics.

Can LT1764AET-1.8#30PBF operate with a 10µF ceramic output capacitor?

Yes, LT1764AET-1.8#30PBF is explicitly characterized and stable with 10µF ceramic capacitors (X7R/X5R), provided ESR is ≥5mΩ - as specified in Table 1 of the datasheet for 1.8V output. This eliminates need for larger tantalum or electrolytic caps while enabling compact, high-frequency-decoupled layouts.

Does LT1764AET-1.8#30PBF support remote sensing, and how is it implemented?

Yes, LT1764AET-1.8#30PBF supports Kelvin sensing via its dedicated SENSE pin (Pin 5). To implement, connect SENSE directly to the load-side output node - not the regulator's OUT pin - to compensate for PCB trace resistance. The 600µA SENSE bias current must be accounted for in high-precision applications, and the pin tolerates negative voltages down to –20V relative to GND.

What protection features are integrated into LT1764AET-1.8#30PBF?

LT1764AET-1.8#30PBF integrates reverse-battery protection (blocks –20V on IN), reverse-output-current blocking (<1.2mA at 1.8V), thermal shutdown (150°C), current limiting (≥3.1A), and controlled quiescent current in dropout - all without external components. It also prevents reverse current flow from OUT to IN during shutdown or backup-battery scenarios.

How does LT1764AET-1.8#30PBF behave during input brownout conditions?

During brownout, LT1764AET-1.8#30PBF maintains well-controlled quiescent current (~1mA) as VIN drops below the dropout threshold - unlike many LDOs whose IQ surges unpredictably. Output voltage follows VIN minus dropout (e.g., 2.0V input yields ~1.66V out), and the device transitions cleanly to shutdown when SHDN is asserted or VIN falls below absolute minimum (1.7V).