Diodes Incorporated PAM2804EV1

Overview

PAM2804EV1 from Diodes Incorporated is a 1A step-down constant-current LED driver with synchronous rectification, 1.5MHz switching frequency, 0.1V feedback reference, and TSOT25 package. It operates from 2.5V–6.0V input (single Li+/3–4AA/USB), enters LDO mode below LED forward voltage, and delivers up to 93% efficiency in flashlight applications.

For engineers reviewing the PAM2804EV1 datasheet, PAM2804EV1 pinout, PAM2804EV1 application, or PAM2804EV1 equivalent, key selection criteria include regulated FB voltage (0.1V), shutdown current (<1µA), thermal shutdown at +150°C, and PWM dimming support via EN pin.

Technical Context

The PAM2804EV1 integrates a P-channel high-side switch and N-channel synchronous rectifier, enabling high-efficiency buck conversion with minimal external components. Its 1.5MHz fixed-frequency operation allows compact LC filtering using 4.7µH inductors and ceramic capacitors.

Control is implemented via current-mode regulation with soft-start and undervoltage lockout (UVLO) that prevents deep discharge of Li+ batteries. Feedback is sensed at the FB pin with 0.1V threshold, directly setting LED current via external sense resistor (e.g., 0.1Ω → 1A).

Key Specifications

Pinout & Package

Package: TSOT25 - 5-pin, 2.9mm × 2.8mm × 1.0mm surface-mount package with exposed thermal pad (θ_JA = 250°C/W on 2-layer JEDEC board).

Key Features

Applications

Equivalent & Alternatives

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

Compared with AP3012KTR-G1 and AL8862SP-13, the PAM2804EV1 uniquely balances 1A adjustability, ultra-low 0.1V FB, and TSOT25 footprint - making it optimal for compact, single-string, battery-fed LED flashlights where efficiency and shutdown leakage are critical.

Availability

PAM2804EV1 is available at Aetrix Electronics and suitable for handheld flashlights, portable medical lighting, and USB-powered LED lamps requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for PAM2804EV1 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, manufacturing, and sales operations across Asia, Europe, and North America.

The PAM2804EV1 belongs to Diodes' LED driver product line, engineered specifically for high-efficiency, battery-conscious portable lighting applications where small size, low quiescent current, and robust protection are mandatory.

FAQ

What is the minimum input voltage required for PAM2804EV1 to regulate 1A LED current?

The PAM2804EV1 maintains regulation down to 2.5V input. Below the LED forward voltage, it enters LDO mode - sustaining 1A output as long as VIN exceeds V_LED + I_LED × (R_DS(ON) + R_L + R_S). For a typical 3.2V white LED, regulation holds to ~3.6V in buck mode and degrades gracefully to ~2.5V in LDO mode.

Can PAM2804EV1 drive multiple LEDs in series?

Yes - it drives any series string whose total forward voltage remains ≤ VIN – (I_LED × R_DS(ON)). At 1A and 4.2V input, maximum supported V_LED is ~3.7V (e.g., one high-brightness white LED). For two 3.2V LEDs (6.4V total), VIN must exceed ~6.9V - beyond its 6.0V rating - so series strings are limited to one LED unless using higher-VIN variants.

How does the 0.1V FB voltage improve system efficiency?

The 0.1V FB reference reduces power dissipated in the current-sense resistor by 90% versus conventional 0.6–1.25V references. For 1A output, a 0.1Ω sense resistor dissipates only 10mW (vs. 60–125mW), lowering thermal load, enabling smaller resistors, and preserving battery runtime - especially critical in compact, sealed flashlight designs.

Is thermal pad soldering required for reliable operation at 1A?

Yes - the TSOT25 package's exposed thermal pad must be soldered to a dedicated copper pour connected to ≥2 internal ground planes. Without proper thermal pad attachment, junction temperature rises rapidly under 1A load; θ_JA degrades from 250°C/W to >350°C/W, risking thermal shutdown even at +25°C ambient.