UM3501 EV Board User’s Guide
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1.3 Interface Define
Tab 1.1 is the directions of UM3501 EV board interface signals
Tab 1.1 UM1661 EVB board interface
Interface
Function
Note
VIN
Power supply input.
GND
Ground.
2.5V – 5.5V power supply.
EN
Chip enable/disable option.
EN=ON (1): enable.
EN=OFF (0): disable.
VOUT
The board output.
UM3501 output.
2 . Board Operation
An input power supply and a load must be connected to the appropriate EVB
connectors in order for the EVB to operate. The absolute maximum input voltage is
6V. The UM3501 is designed to operate with a maximum input voltage of 5.5 V.
Short pins 2
−
3 on jumper EN (labeled ON) to enable the device. Connect a load not
to exceed 600 mA to the output of the EVB. Fig 2.1 shows the output ripple and
switching waveform for UM3501’s operation. (V
IN
=3.6V, V
OUT
=1.8V, 300mA load
current).