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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 AECQ10x No
Automotive Compliant PPAP Standard
Topologies (Buck) Yes
Topologies (Buck-Boost) No
Topologies (Boost) No
Minimum Input Voltage 6 V
Maximum Input Voltage 40 V
Maximum Output Voltage 40 V
Maximum LED Current 1 A
LED Current Accuracy 5 %
Switching Frequency Maximum 1000 kHz
Dimming (PWM) Yes
Dimming (Analog) Yes
Efficiency 97 %
Operating Temperature Range -40 to 85 °C
Sense Voltage 100 mV
AEC-Q100 Grade No

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Orderable Part Number Buy from Distributor / Contact Sales Request Samples


Authorized Distributor Quantity Inventory Date Countries/Regions Buy Online
Rutronik GmbH 1000 3/5/2021 Germany Buy Now
Digi-Key Electronics 4060 3/4/2021 Europe, Asia, North America Buy Now
Farnell, An Avnet Company 719 3/4/2021 England Buy Now
RS Components 145 3/4/2021 England Buy Now
RS Components Ltd. 355 3/4/2021 Japan Buy Now
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