Diodes Incorporated PAM3110BLA330R

Overview

PAM3110BLA330R from Diodes Incorporated is a fixed-output 3.3V, 1.5A CMOS low-dropout (LDO) regulator in TO-252 package, featuring 400mV dropout at full load, ±1.5% output accuracy, and stability 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 PAM3110BLA330R datasheet, PAM3110BLA330R pinout, PAM3110BLA330R application, or PAM3110BLA330R equivalent, key selection criteria include dropout voltage under 1.5A load, thermal resistance (θJA = 90°C/W), over-temperature shutdown threshold (160°C), and compatibility with low-ESR ceramic capacitors in space-constrained PCB layouts.

Technical Context

The PAM3110BLA330R integrates a PMOS pass transistor with internal current limiting (2A), thermal shutdown (160°C trip, 30°C hysteresis), and open-drain Power Good (POK) monitoring. Its control circuitry operates from a dedicated CTRL pin, enabling independent biasing for improved noise immunity.

It functions as a fixed-output LDO without external feedback-output voltage is factory-trimmed to 3.3V ±1.5%. The device requires no external resistors and supports input voltages from 2.5V to 5.5V, making it suitable for single-cell Li-ion or 3.3V/5V rail post-regulation where headroom is limited.

Key Specifications

Pinout & Package

Package: TO-252 (DPAK), surface-mount, thermally enhanced with exposed pad soldered to GND 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 and AP7173, the PAM3110BLA330R uniquely combines POK signaling, TO-252 thermal performance (90°C/W), and factory-trimmed 3.3V in a no-resistor solution-making it optimal for cost-sensitive, thermally constrained, and sequenced-power applications.

Availability

PAM3110BLA330R is available at Aetrix Electronics and suitable for FPGA I/O power supplies, wireless baseband modules, and LCD panel logic rails requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for PAM3110BLA330R 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' high-current LDO family designed specifically for post-regulation in mixed-signal systems-emphasizing low dropout, ceramic-capacitor compatibility, and integrated protection for FPGA, microprocessor, and display power domains.

FAQ

What is the minimum input voltage required for PAM3110BLA330R to maintain 3.3V output at 1.5A?

The minimum input voltage is 3.7V: 3.3V output + 400mV typical dropout voltage. Operation below this causes output collapse. Input must remain ≥2.5V per absolute ratings, but regulation fails below 3.7V under full load. The device remains functional (e.g., EN control, POK assertion) down to 2.5V, but cannot sustain 3.3V at rated current.

Can PAM3110BLA330R operate without the CTRL pin connected?

No. The CTRL pin must be connected to a 2.5–5.5V supply-identical to VIN or a cleaner auxiliary rail. Leaving CTRL floating or unconnected disables internal biasing, causing erratic EN response, missing POK assertion, and potential thermal shutdown due to undefined control circuit behavior. A direct tie to VIN is acceptable if input rail noise is low.

Is the exposed thermal pad on the TO-252 package electrically connected?

Yes-the exposed pad is internally connected to GND and must be soldered to a large PCB GND plane. This provides both electrical grounding and primary thermal conduction path. Failure to connect it results in θJA degrading from 90°C/W to >150°C/W, triggering thermal shutdown at ≤0.8A load even at 25°C ambient.

Does PAM3110BLA330R require an input capacitor, and what type is recommended?

Yes-a minimum 4.7µF ceramic capacitor (X5R/X7R, 6.3V rating) is required between VIN and GND, placed within 5mm of the pins. This stabilizes the control loop and prevents oscillation. Tantalum or aluminum electrolytic capacitors are not recommended due to ESR and aging effects that compromise stability and transient response.