Diodes Incorporated PAM2803EV1

Overview

PAM2803 from Diodes Incorporated is a 1MHz step-up DC-DC LED driver IC with integrated 2A/100mΩ NMOS switch, 95mV feedback reference, and shutdown current <1µA. It delivers up to 750mA regulated LED current from as low as 0.9V input (e.g., two-cell alkaline), targeting high-efficiency white LED flash applications in portable imaging devices.

For engineers reviewing the PAM2803 datasheet, PAM2803 pinout, PAM2803 application, or PAM2803 equivalent, key selection criteria include start-up voltage (0.9V), feedback accuracy (±5% over 1.8–3.6V input), thermal shutdown threshold (150°C), SOT23-6 package constraints, and external RS-based current programming.

Technical Context

The PAM2803 employs a constant-frequency current-mode boost architecture with internal 2A NMOS switch and precision 95mV FB reference. Its 1MHz oscillator enables compact 2.2–4.7µH inductors and ceramic input/output capacitors.

Operation supports wide input range (0.9–VF−0.2V), low hold voltage (0.75V at 200mA), and full disconnection of RS and load during shutdown. Over-temperature protection activates at 150°C with 15°C hysteresis.

Key Specifications

Pinout & Package

Supplied in a Pb-free 6-lead SOT23-6 package (2.9mm × 2.8mm × 1.3mm), thermally rated for 250°C/W junction-to-ambient and 400mW max internal power dissipation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar white LED boost driver applications.

Compared with AP3012KTR-G1 and MT9700EN, the PAM2803 uniquely combines 0.9V start-up, 150°C thermal shutdown, and sub-1µA shutdown current-making it optimal for battery-sensitive, thermally unmanaged flashlight and mobile flash designs.

Availability

PAM2803 is available at Aetrix Electronics and suitable for white LED torches, cellular camera phone flashes, and DSC flash modules requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for PAM2803 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 Americas.

The PAM2803 belongs to Diodes' high-efficiency LED driver product line, engineered specifically for portable imaging flash applications demanding ultra-low start-up voltage, high current accuracy, and robust thermal management in space-constrained SOT23-6 packages.

FAQ

What is the minimum input voltage required for the PAM2803 to start regulating LED current?

The PAM2803 starts regulating LED current at 0.9V input when delivering 370mA. This low start-up voltage enables operation from nearly depleted alkaline cells, extending usable battery life in flashlight and portable camera applications where input voltage sags during discharge.

How is LED current set, and what resistor tolerance is recommended?

LED current is set by an external resistor RS between FB and GND, using ILED = 95mV / RS. A 1% or better tolerance resistor is recommended to maintain the specified ±5% current accuracy across 1.8–3.6V input range, as tighter tolerance directly improves flash brightness consistency and battery lifetime predictability.

Does the PAM2803 require an external Schottky diode, and why?

Yes, an external Schottky diode rated for ≥2A is mandatory. The PAM2803's SW pin drives this diode to complete the boost inductor current path. A low-VF Schottky (e.g., MBRA210LT3G) minimizes conduction loss and improves overall efficiency-especially critical in battery-powered flash applications where every milliwatt affects runtime and thermal rise.

What thermal protection features does the PAM2803 provide?

The PAM2803 includes over-temperature shutdown at 150°C with 15°C hysteresis. When junction temperature exceeds 150°C, the device disables switching and disconnects the load until temperature falls below 135°C, preventing permanent damage during sustained overload, poor PCB thermal design, or ambient temperature excursions in enclosed enclosures.