Diodes Incorporated PAM2800AABR

Overview

PAM2800AABR from Diodes Incorporated is a high-efficiency, constant-current white LED driver IC delivering 350mA source current with 92% typical efficiency and 65µA quiescent current in SOT25 package. It integrates open-load and short-circuit LED protection, thermal shutdown at 150°C, and operates from 2.7V to 5.5V input for portable lighting systems.

For engineers reviewing the PAM2800AABR datasheet, PAM2800AABR pinout, PAM2800AABR application, or PAM2800AABR equivalent, key selection criteria include its 350mA regulated output, 1.12V feedback reference with ±3% tolerance, EN-active-high enable control, and thermal protection hysteresis of 30°C - all critical for battery-powered LED design validation.

Technical Context

The PAM2800AABR is a linear constant-current LED driver using an internal pass transistor controlled by a precision feedback loop referencing a 1.12V bandgap voltage. Its EN pin enables direct microcontroller-level on/off sequencing without external logic.

Thermal protection operates via junction-sensing: device shuts down at 150°C and resumes at 120°C, with θJA = 250°C/W for SOT25. Power dissipation is limited to 400mW at TA = +25°C, requiring careful PCB copper area planning for continuous 350mA operation.

Key Specifications

Pinout & Package

SOT25 (5-pin) surface-mount package with exposed thermal pad (not electrically connected); footprint matches JEDEC MO-178AA standard; recommended pad layout per Diodes Inc. package outline SOT25.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AL8805W50-7 and AP3603B-33TRG1, the PAM2800AABR uniquely balances 350mA drive, integrated fault protection, and ultra-low quiescent current in a minimal SOT25 footprint - making it optimal for space- and battery-limited linear LED systems where simplicity and reliability are prioritized over peak efficiency.

Availability

PAM2800AABR is available at Aetrix Electronics and suitable for flashlight systems, portable medical lighting, industrial inspection lamps, and emergency exit sign modules requiring stable component supply and long-lifecycle support.

Supply support for PAM2800AABR 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, with design and manufacturing operations across Asia and the US.

The PAM2800 belongs to Diodes' high-efficiency LED driver product line, engineered specifically for portable, battery-powered lighting applications demanding precision current regulation and robust fault handling in minimal PCB area.

FAQ

What is the minimum input voltage required for PAM2800AABR to regulate 350mA into a typical white LED?

The PAM2800AABR requires VIN ≥ (VLED + ILED × RS + 0.3V). With VLED ≈ 3.2V, RS = 0.22Ω, and 350mA, minimum VIN is ~3.3V. Below this, regulation fails and output current drops - confirmed by electrical characteristics table showing functional operation down to 2.7V only at reduced current levels.

How does the FB pin function in setting LED current, and what resistor values are recommended?

The FB pin senses voltage across an external sense resistor (RS) and regulates VOUT to maintain 1.12V at FB. For 350mA, RS ≈ 0.22Ω. A voltage divider (R1=62kΩ, R2=33kΩ) sets bias for accurate current sensing - per Application Information section, this network compensates for VFB tolerance and ensures stability across temperature.

Can PAM2800AABR drive multiple LEDs in series, and what limits this configuration?

No - the PAM2800AABR is a single-string, constant-current source with VOUT referenced to GND. It cannot drive series LEDs requiring higher forward voltage than VIN allows. Maximum VOUT is VIN – 0.3V (per Absolute Maximum Ratings), limiting usable LED count to one standard white LED (≤3.6V) at VIN = 5.5V.

Is thermal pad connection required for reliable operation at 350mA, and how should it be implemented?

Yes - the SOT25 package thermal pad must be soldered to a dedicated PCB copper pour connected to GND for effective heat transfer. Per Thermal Information, θJA = 250°C/W assumes JEDEC-standard single-layer board; omitting the thermal pad increases junction temperature by >40°C at 350mA, risking premature thermal shutdown.