Diodes Incorporated PAM3110AMB330R

Overview

PAM3110AMB330R from Diodes Incorporated is a fixed-output 3.3V, 1.5A CMOS low-dropout (LDO) regulator in TO-263-2L package, featuring 400mV dropout at full load, ±1.5% output accuracy, and stable operation with ≥4.7µF ceramic output capacitor. It delivers regulated power for FPGA core supplies and post-regulation of switch-mode converters in space-constrained industrial and portable systems.

For engineers reviewing the PAM3110AMB330R datasheet, PAM3110AMB330R pinout, PAM3110AMB330R application, or PAM3110AMB330R equivalent, key selection criteria include dropout voltage under 1.5A load, thermal resistance (θJA = 60°C/W), over-temperature shutdown at 160°C, and compatibility with low-ESR ceramic capacitors without external compensation.

Technical Context

The PAM3110AMB330R uses a CMOS pass transistor architecture enabling low quiescent current (75–150µA) and low dropout across its 2.5–5.5V input range. Its internal bandgap reference and error amplifier maintain 3.3V output within ±1.5% over load (1mA–1.5A), line (±0.5% / V), and temperature (40ppm/°C).

Protection circuitry includes foldback current limiting (2A typical), short-circuit current limit (500mA), and thermal shutdown with 30°C hysteresis. The device operates across –40°C to +85°C ambient and supports power-good signaling via open-drain POK output.

Key Specifications

Pinout & Package

Package: TO-263-2L (D2PAK), thermally enhanced surface-mount package with exposed drain pad soldered to PCB ground plane for optimal heat transfer.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AP2132-33W5-7 and AP7173-33W5-7, the PAM3110AMB330R offers balanced performance for 1.5A industrial loads in TO-263-2L, with superior thermal resistance over SOT-23 alternatives and simpler layout than TO-252 alternatives requiring extra routing for thermal pad.

Availability

PAM3110AMB330R is available at Aetrix Electronics and suitable for FPGA power delivery, industrial display controllers, and SATA interface modules requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for PAM3110AMB330R 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 power management, signal integrity, and protection solutions for industrial, computing, and consumer markets.

The PAM3110 belongs to Diodes' high-current LDO family designed specifically for post-regulation in multi-rail power systems and low-voltage core/I/O supply applications where ceramic capacitor compatibility and thermal robustness are critical.

FAQ

What is the minimum input voltage required for PAM3110AMB330R to maintain 3.3V output at 1.5A?

The minimum input voltage is 3.7V, calculated as 3.3V + 400mV dropout. Operation below this voltage causes output collapse under full load. Input must remain ≥2.5V for bias functionality, but regulation is not guaranteed below 3.7V at 1.5A.

Can PAM3110AMB330R operate without an external POK pull-up resistor?

No. The POK pin is open-drain and requires an external pull-up resistor (typically 10kΩ to 3.3V or 5V) to generate a valid logic-high signal. Without it, the POK output remains floating and cannot indicate power-good status to system controllers.

Is the exposed thermal pad on the TO-263-2L package electrically connected to GND?

Yes. The exposed pad is internally connected to the GND terminal and must be soldered to a PCB copper pour tied to system ground. This dual-purpose connection provides both electrical grounding and primary thermal conduction path to the board.

Does PAM3110AMB330R require input and output capacitors of identical value or type?

No. The datasheet specifies ≥4.7µF ceramic for both, but recommends a 10µF+ low-ESR ceramic at the output for improved transient response. Input and output capacitors may differ in value and ESR to optimize stability and noise rejection independently.