User Guide

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GM500-U1G_A
Hardware Development Guide
Figure 2–3 Reference circuit of DC-DC
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Option 2:LDO
The over-current capability of LDO is above 2.5A. This LDO is apply to this situation: input and output voltage difference is small.
The reference power supply circuit design with LDO is shown as figure below:
Figure 2–4 Reference circuit of LDO
2.5. Turn on Scenarios
When MCU can provide high/low level pulse with adjustable length, the reference circuit to turn-on/off module is as shown in the
following figure below.
The resistors in Figures below are only the recommended value and they need to adjust according to the actual situation.
Power-on by dynatron, the circuit ① connect ON/OFF to high level to power-on the module, the circuit ② can connect ON/OFF
to low level to power-on the module