Diodes Incorporated PAM3101FKF330

Overview

PAM3101FKF330 from Diodes Incorporated is a 3.3V fixed-output, 300mA low-dropout CMOS linear regulator with 65µA quiescent current, 180mV dropout at full load, and 70dB PSRR at 1kHz-designed for noise-sensitive battery-powered systems such as Bluetooth earphones and portable WLAN modules.

For engineers reviewing the PAM3101FKF330 datasheet, PAM3101FKF330 pinout, PAM3101FKF330 application, or PAM3101FKF330 equivalent, key selection criteria include output voltage accuracy (±2%), shutdown current (0.5µA), thermal shutdown threshold (+150°C), BYP pin noise-filtering capability, and DFN1.6x1.6-6L package compatibility with space-constrained PCB layouts.

Technical Context

The PAM3101FKF330 integrates a P-channel MOSFET pass transistor (R_DS(on) ≈ 0.75Ω) enabling ultra-low ground current across load conditions. Its internal feedback loop maintains ±2% output voltage accuracy over line, load, and temperature variations while supporting fast discharge and stable operation with ≥2.2µF ceramic output capacitance.

It features active-high enable (EN) control, a dedicated 10nF bypass (BYP) pin for high-frequency noise suppression, and dual protection circuitry: current limiting (400mA typical) and thermal shutdown with 30°C hysteresis. The device operates within 2.5V–5.5V input range and guarantees functionality from –40°C to +85°C ambient.

Key Specifications

Pinout & Package

DFN1.6x1.6-6L package: 1.6mm × 1.6mm body, 0.5mm pitch, exposed thermal pad, RoHS-compliant, moisture sensitivity level 1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AP2125K-3.3TRG1, the PAM3101FKF330 offers superior noise suppression via its BYP pin and higher PSRR; versus AP2127K-3.3TRG1, it shares identical electrical behavior but is legacy-marked-making AP2127 the preferred drop-in upgrade path for reliability and long-term supply.

Availability

PAM3101FKF330 is available at Aetrix Electronics and suitable for Bluetooth earphones, WLAN modules, and portable audio devices requiring stable component supply with known lifecycle status and traceable sourcing.

Supply support for PAM3101FKF330 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, headquartered in Plano, Texas, serving automotive, industrial, computing, and consumer markets with high-reliability components.

The PAM3101 belongs to Diodes' high-PSRR, low-I_Q LDO family-engineered specifically for battery-powered portable electronics where efficiency, noise immunity, and small-footprint integration are mandatory.

FAQ

What is the minimum input voltage required for PAM3101FKF330 to maintain regulation at 300mA?

The minimum input voltage is determined by the sum of output voltage and dropout: VIN(MIN) = 3.3V + 180mV = 3.48V. At lighter loads, dropout decreases-e.g., at 1mA, dropout drops to ~100mV, allowing VIN as low as 3.4V while maintaining regulation. This value assumes TA = +25°C and proper output capacitance.

Can the BYP pin be left unconnected, or is the 10nF capacitor mandatory?

The 10nF capacitor from BYP to GND is strongly recommended-not optional-for achieving the specified 50µV_RMS output noise and 70dB PSRR. Leaving BYP open degrades high-frequency noise rejection and may increase output ripple above 100kHz; the internal 200kΩ resistor forms a filter only when the capacitor is present.

Does PAM3101FKF330 require an input capacitor, and what type is recommended?

Yes-an input capacitor ≥1µF ceramic is required for stability and transient response. It must be placed within 0.5 inch of the VIN pin. X5R or X7R dielectrics are preferred for stable capacitance over temperature and bias; tantalum or aluminum electrolytics are not recommended due to higher ESR and aging effects.

How does the thermal shutdown behave during continuous overload?

When junction temperature exceeds +150°C, the device disables the pass transistor and enters thermal shutdown. It remains off until the junction cools to +120°C (30°C hysteresis), then automatically resumes regulation. During repeated cycling, average output current is limited by package θ_JA (175°C/W for DFN1.6x1.6) and PCB copper area.