Update esp_ldo.md

Author: p1ngb4ck

content/components/esp_ldo.md

@@ -14,12 +14,14 @@ component allows those regulators to be configured and enabled.
 esp_ldo:
   - channel: 3
     voltage: 2.5V
+  - channel: 4      // example for sd activation on Guition JC-ESP32-P4-M3 dev board
+    voltage: 3.3V   // GPIO45 on these boards can then do PWM on that power supply line on runtime (ledc)
 ```
 
 ## Configuration variables
 
 - **channel** (**Required**, int): The channel number of the LDO regulator to configure. Only channels 3 and 4 are supported (1 and 2 are used internally by the chip.)
-- **voltage** (**Required**, voltage): The desired output voltage - must be in the range 0.5V to 2.7V.
+- **voltage** (**Required**, voltage): The desired output voltage - must be in the range 0.5V to 3.3V. Default is 2.7V. 3.3V in case LDO is used for SD-card slot power.
 - **adjustable** (*Optional*, bool): If true, the output voltage can be adjusted at run-time. Defaults to false.
 
 ## `esp_ldo.voltage.adjust` Action
@@ -37,7 +39,7 @@ on_...:
 ### Configuration variables
 
 - **id** (**Required**, [ID](#config-id)) The ID of the LDO to adjust.
-- **voltage** (**Required**, voltage): The desired output voltage - must be in the range 0.5V to 2.7V.
+- **voltage** (**Required**, voltage): The desired output voltage - must be in the range 0.5V to 3.3V. Defaults to 2.7V
 
 ## See Also