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The PAM2861 is a continuous mode inductive step-down converter, designed for driving single or multiple series connected LEDs efficiently from a voltage source higher than the LED voltage. The device operates from an input supply between 6V and 40V and provides an externally adjustable output current of up to 1A. Depending upon supply voltage and external components, this can provide up to 30 watts of output power. The PAM2861 includes the output switch and a high-side output current sensing circuit, which uses an external resistor to set the nominal average output current. Output current can be adjusted below the set value, by applying an external control signal to the VSET pin. The VSET pin will accept either a DC voltage or a PWM waveform. The soft-start time can be increased using an external capacitor from the VSET pin to ground. Applying a voltage of 0.2V or lower to the VSET pin turns the output off and switches the device into a low current standby state.


  • Low voltage halogen replacement LEDs
  • Low voltage industrial lighting
  • LED back-side lighting
  • Illuminated signs


  • Simple Low Parts Count
  • Internal 40V NDMOS Switch
  • 1A Output Current
  • Single Pin On/Off and Brightness Control Using DC Voltage or PWM
  • Soft-Start
  • High Efficiency (up to 97%)
  • Wide Input Voltage Range: 6V to 40V
  • Output Shutdown
  • Open LED Protection
  • Short LED Protection
  • Up to 1MHz Switching Frequency
  • Inherent Open-Circuit LED Protection
  • Typical 5% Output Current Accuracy
  • Pb-free TSOT25 and SOT89-5 Packages

Product Specifications

Product Parameters

Qualified to AEC-Q10x No
Compliance (Only Automotive supports PPAP) Standard
Topologies (Buck) Yes
Topologies (Buck-Boost) No
Topologies (Boost) No
MinimumInput Voltage (V) 6 V
MaximumInput Voltage (V) 40 V
Maximum Output Voltage (V) 40 V
Maximum LED Current (A) 1 A
LED Current Accuracy (%) 5 %
Switching Frequency Maximum (kHz) 1000 kHz
Dimming (PWM) Yes
Dimming (Analog) Yes
Efficiency (%) 97 %
OperatingTemperatureRange  (°C) -40 to 85 °C
Sense Voltage (mV) 100 mV
AEC-Q100 Grade No

Related Content


Technical Documents


Evaluation Boards and User Guides

Recommended Soldering Techniques


Orderable Part Number Buy from Distributor / Contact Sales Request Samples


Authorized Distributor Quantity Inventory Date Countries/Regions Buy Online
RS Components 40 9/18/2021 England Buy Now
Request Sample


Product Change Notices

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