Diodes Incorporated

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Back to Medium and Low Voltage DC-DC LED Drivers


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The PAM2804 is a step-down constant current LED driver. When the input voltage down to lower than LED forward voltage, then PAM2804 run into LDO mode. The PAM2804 supports a range of input voltages from 2.5V to 6.0V, allowing the use of a single Li+/Li-polymer cell, 3AA or 4AA cell, USB, and other standard power sources. The FB voltage is only 0.1V to achieve high efficiency. PAM2804 employ internal power switch and synchronous rectifier to minimize external part count and realize high efficiency. During shutdown, the input is disconnected from the output and the shutdown current is less than 1μA. Other key features include undervoltage lockout to prevent deep battery discharge of the Li+ battery.


  • Efficiency up to 93%
  • 180μA(typ) Quiescent Current
  • Output Current: Up to 1A
  • Internal Synchronous Rectifier
  • 1.5MHz Switching Frequency
  • Soft-Start
  • Under-Voltage Lockout
  • Short LED Protection
  • Open LED Protection
  • Thermal Shutdown
  • 5-pin Small TSOT25 Package
  • Pb-Free Package


  • 3AA or 4AA Batteries Powered Flashlight
  • 1 Cell Li-Ion Battery Powered Flashlight

Product Specifications

Product Parameters

AEC Qualified No
Compliance (Only Automotive supports PPAP) Standard
Topologies (Buck) Yes
Topologies (Buck-Boost) No
Topologies (Boost) No
Topologies (Charge Pump) No
Minimum Input Voltage (V) 2.5
Maximum Input Voltage (V) 6
Maximum Output Voltage (V) 5
Maximum LED Current (A) 1
Switching Frequency Maximum (kHz) 1500
Dimming (PWM) Yes
Dimming (Analog) No
Efficiency (%) 93
Operating Temperature Range (°C) -40 to 85
Quiescent Current Typ (mA) 0.18
AEC-Q100 Grade No

Related Content


Technical Documents

Evaluation Boards and User Guides

Recommended Soldering Techniques


Product Change Notices (PCNs)

A PCN may only apply to specific orderable part numbers in this datasheet. Please refer to the corresponding PCN to see the exact orderable part number(s) affected.

PCN # Issue Date Implementation Date Subject
PCN-2512 2021-04-16 2021-07-16 Qualified Additional Assembly & Test (A/T) Site