Diodes Incorporated PAM2305BJEADJ

Overview

PAM2305BJEADJ from Diodes Incorporated is a 1A synchronous step-down DC-DC converter with adjustable output voltage (0.6V to VIN), 1.5MHz fixed-frequency PWM control, and pulse-skipping modulation (PSM) for ultra-low quiescent current (40µA typ) in light-load portable applications. It integrates high- and low-side MOSFETs, supports 2.5V–5.5V input (single Li+/USB/alkaline), and features under-voltage lockout, thermal shutdown, and short-circuit protection.

For engineers reviewing the PAM2305BJEADJ datasheet, PAM2305BJEADJ pinout, PAM2305BJEADJ application, or PAM2305BJEADJ equivalent, key selection criteria include its 0.6V feedback reference, 1.5MHz switching frequency, TSOT25/DFN2x2/QFN3x3 package options, and design suitability for battery-powered systems requiring high efficiency (>96%) and sub-1µA shutdown current.

Technical Context

The PAM2305BJEADJ employs current-mode control with internal 0.6V reference and 1.5MHz oscillator, enabling fast transient response and stable regulation across 2.5V–5.5V input. Its PSM mode automatically transitions from PWM to discontinuous conduction at light loads, reducing IQ to 40µA while maintaining regulation.

It integrates complementary P- and N-channel MOSFETs with RDS(ON) of 0.45Ω (P-ch) and 0.5Ω (N-ch), supporting up to 1A continuous output. Soft-start limits inrush current, and overtemperature protection triggers at 150°C with 30°C hysteresis.

Key Specifications

Pinout & Package

PAM2305BJEADJ is packaged in a 16-pin QFN3x3 with exposed thermal pad (DAP: 1.90×1.90mm), optimized for thermal performance in space-constrained portable designs. The package supports 1.47W max power dissipation at TA=25°C (θJA = 35°C/W).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar step-down DC-DC converter applications.

Compared with TPS62231DRYR and RT8059GJ6, PAM2305BJEADJ uniquely combines adjustable output, QFN3x3 thermal performance (1.47W PD), and validated 1A capability across –40°C to +85°C - making it optimal for thermally demanding portable systems needing design flexibility.

Availability

PAM2305BJEADJ is available at Aetrix Electronics and suitable for wireless headsets, smart wearables, USB-powered diagnostic tools, and industrial handheld scanners requiring stable component supply, consistent parametric performance, and long-term lifecycle support.

Supply support for PAM2305BJEADJ 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-efficiency power management, signal integrity, and protection solutions for consumer, industrial, and computing markets.

The PAM2305 belongs to Diodes' high-density DC-DC converter product line, engineered specifically for space- and battery-constrained portable electronics requiring high efficiency, low IQ, and robust thermal behavior in miniature packages.

FAQ

What is the minimum output voltage achievable with PAM2305BJEADJ?

The minimum regulated output voltage is 0.6V, set by the internal feedback reference voltage. This value is fixed and cannot be lowered further; external resistor dividers scale higher voltages above this threshold using VO = 0.6V × (1 + R1/R2). No external components can reduce the regulated output below 0.6V.

Can PAM2305BJEADJ operate with a 2.4V input supply?

No - the absolute minimum input voltage is 2.5V per the Recommended Operating Conditions table. At 2.4V, the device enters undervoltage lockout (UVLO) and ceases switching. Operation below 2.5V risks unstable regulation or complete shutdown, even if the absolute maximum rating lists –0.3V to +6.0V as non-operational stress limits.

How does the soft-start function affect startup time?

The internal digital soft-start ramps switch current in discrete steps to limit inrush, resulting in a typical startup time of 1.2ms to reach 90% of final VOUT (measured at 3.3V output, 100µF COUT). This delay prevents input voltage sag and eliminates output overshoot, but does not impact steady-state regulation speed.

Is the exposed thermal pad on the QFN3x3 package required to be soldered?

Yes - the exposed pad (DAP: 1.90×1.90mm) is electrically connected to GND and serves as the primary thermal path. It must be soldered to a solid copper thermal plane on the PCB using ≥90% solder coverage; omitting this compromises thermal resistance (θJA degrades from 35°C/W to >60°C/W) and risks thermal shutdown at ≤600mA load.