Diodes Incorporated PAM3110ABA330R

Overview

PAM3110ABA330R from Diodes Incorporated is a fixed-output 3.3V, 1.5A CMOS low-dropout (LDO) regulator in SOT-223 package, featuring 400mV dropout at full load, ±1.5% output voltage accuracy, and stable operation with ≥4.7µF ceramic output capacitor. It delivers regulated power to FPGA core supplies, microprocessor I/O rails, and post-regulation stages in compact DC/DC systems.

For engineers reviewing the PAM3110ABA330R datasheet, PAM3110ABA330R pinout, PAM3110ABA330R application, or PAM3110ABA330R equivalent, key selection criteria include dropout performance at 1.5A, thermal resistance (θJA = 160°C/W), enable-controlled sequencing, and compatibility with low-ESR ceramic capacitors in space-constrained designs.

Technical Context

The PAM3110ABA330R integrates a PMOS pass transistor enabling ultra-low dropout and minimal quiescent current (75–150µA). Its internal bandgap reference and error amplifier maintain regulation across input voltages from 2.5V to 5.5V and load currents up to 1.5A.

Protection circuitry includes thermal shutdown at 160°C with 30°C hysteresis, short-circuit limiting (~500mA), and foldback current limiting. The device operates over –40°C to +85°C ambient and supports power-good monitoring via open-drain POK output.

Key Specifications

Pinout & Package

SOT-223 package with exposed thermal pad soldered to GND plane for enhanced heat dissipation. Pin 1 = VIN, Pin 2 = GND, Pin 3 = VOUT, Pin 4 = EN (active-high enable).

Key Features

Applications

Equivalent & Alternatives

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

Compared with AP2132 and AP7173, the PAM3110ABA330R offers optimal balance of cost, proven reliability in SOT-223, and adequate performance for mid-power digital rails-making it ideal for cost-sensitive industrial and consumer designs where 1.5A and 400mV dropout meet requirements.

Availability

PAM3110ABA330R is available at Aetrix Electronics and suitable for FPGA power supplies, microprocessor I/O rails, and post-regulation stages requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for PAM3110ABA330R 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

Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability power management, signal integrity, and protection solutions for industrial, computing, and consumer markets.

The PAM3110 belongs to Diodes' precision LDO family targeting low-noise, low-dropout regulation for digital logic and mixed-signal subsystems-designed specifically for FPGA, microprocessor, and post-SMPS applications demanding tight accuracy and robust fault protection.

FAQ

What is the minimum input voltage required for stable 3.3V output at 1.5A?

The PAM3110ABA330R requires a minimum input voltage of 3.7V to maintain regulation at 1.5A load, based on its 400mV dropout specification (3.3V + 0.4V = 3.7V). Input below this threshold causes output collapse into dropout, reducing output voltage linearly with input.

Can the PAM3110ABA330R operate without an external EN pull-up resistor?

Yes-the EN pin has an internal pull-up to V_CTRL, so the device powers up enabled by default when V_CTRL is applied. An external resistor is only needed if active-low enable logic or precise timing control is required.

Is the exposed thermal pad electrically connected to GND?

Yes-the exposed pad on the SOT-223 package is internally tied to GND and must be soldered to a large PCB GND copper area to achieve the specified θJA = 160°C/W and prevent thermal shutdown under full load.

Does the PAM3110ABA330R require input and output capacitors of identical type and value?

No-input requires ≥4.7µF ceramic (X5R/X7R), while output requires ≥4.7µF ceramic but benefits from an additional ≥10µF low-ESR capacitor for improved transient response and PSRR. Type and ESR values may differ between input and output to optimize stability and noise rejection.