Diodes Incorporated PAM2804AAB010

Overview

PAM2804AAB010 from Diodes Incorporated is a 1A step-down constant-current LED driver with synchronous rectification, 1.5MHz switching frequency, 0.1V feedback reference, and LDO-mode operation when input voltage drops near LED forward voltage. It supports 2.5V–6.0V input (single Li+/Li-polymer or 3–4AA batteries) and delivers up to 1A output current for flashlight applications.

For engineers reviewing the PAM2804AAB010 datasheet, PAM2804AAB010 pinout, PAM2804AAB010 application, or PAM2804AAB010 equivalent, key selection criteria include regulated FB voltage (0.1V), thermal shutdown threshold (+150°C), quiescent current (180µA), and TSOT25 package compatibility with high-density portable PCB layouts.

Technical Context

The PAM2804AAB010 integrates a P-channel main switch and N-channel synchronous rectifier to achieve up to 93% efficiency across its 2.5V–6.0V input range. Its 0.1V FB threshold minimizes sense resistor power loss, enabling precise 1A LED current regulation via a 0.1Ω external resistor.

It operates in buck mode under normal conditions and transitions seamlessly to LDO-like linear regulation when VIN approaches V_LED, maintaining current control without external circuit changes. Protection features include undervoltage lockout (UVLO), open/short LED detection, and thermal shutdown with +30°C hysteresis.

Key Specifications

Pinout & Package

Package: TSOT25 - 5-pin, 2.9mm × 2.8mm × 0.9mm ultra-thin surface-mount package with exposed thermal pad (θ_JA = 250°C/W on 2-layer JEDEC board), optimized for handheld LED lighting.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar constant-current LED driver applications.

Compared with AP3032 and AL8805, PAM2804AAB010 uniquely combines 1A capability, 0.1V FB, integrated synchronous rectification, and seamless LDO fallback-making it optimal for space-constrained, battery-efficient flashlight designs where runtime and form factor are critical.

Availability

PAM2804AAB010 is available at Aetrix Electronics and suitable for handheld flashlights, USB-powered LED lamps, and industrial inspection lights requiring stable component supply, consistent parametric performance, and long-term production support.

Supply support for PAM2804AAB010 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 automotive markets.

The PAM2804 belongs to Diodes' LED driver product line, engineered specifically for portable, battery-powered illumination systems demanding high efficiency, minimal external components, and robust thermal and fault protection.

FAQ

What is the minimum input voltage required for PAM2804AAB010 to regulate 1A LED current?

The PAM2804AAB010 maintains regulation down to 2.5V input. At this voltage, it operates in LDO fallback mode when LED forward voltage exceeds VIN minus internal losses. For example, with a 2.8V white LED and 0.1Ω sense resistor, it sustains 1A output even at 2.5V input, provided thermal limits are observed.

Can PAM2804AAB010 drive multiple series-connected LEDs?

Yes - it regulates total string current, not individual LED voltage. With a 3.2V typical forward voltage per LED, it can drive up to two white LEDs (6.4V total V_F) only in LDO mode when VIN ≥ ~6.7V, but its 6.0V absolute max input limits practical use to one high-brightness LED or parallel-configured strings with matched V_F.

How does the 0.1V feedback voltage improve system efficiency?

The 0.1V FB threshold reduces power dissipation in the external current-sense resistor by 75% compared to 0.25V alternatives (e.g., AP3032). At 1A output, power loss drops from 250mW (0.25Ω) to 100mW (0.1Ω), lowering thermal load and enabling smaller, cheaper resistors without compromising accuracy.

Is thermal derating required for continuous 1A operation in TSOT25 package?

Yes - at 25°C ambient, maximum continuous power dissipation is 400mW (per θ_JA = 250°C/W). At 1A and 0.1V FB, typical losses are ~200mW at VIN = 4.2V, but rise significantly near dropout. Derating to ≤800mA is recommended above 60°C ambient unless PCB copper area and airflow are enhanced.