1.5A LED Driver with Internal Switch
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 1.5A.
Depending upon supply voltage and external
components, this can provide up to 30 watts of
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
Simple low parts count
Internal 40V NDMOS switch
1.5A output current
Single pin on/off and brightness control
Using DC voltage or PWM
High efficiency (up to 95%)
Wide input voltage range: 6V to 40V
Up to 1MHz switching frequency
Inherent open-circuit LED protection
Typical 5% output current accuracy
Pb-free SOT23-5, SOT89-5 and PSOP-8
Low voltage halogen replacement LEDs
Low voltage industrial lighting
LED back-up lighting
10 μ F
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.
100 μ H
Power Analog Microelectronics