BOOT |
1 |
O |
A bootstrap capacitor is required between the BOOT and SW pins to supply the bias voltage for the integrated high-side MOSFET. |
COMP |
12 |
O |
Error-amplifier output of the buck regulator, and input to the output-switch current comparator of the buck regulator. Connect frequency-compensation components to the COMP pin. |
EN1 |
8 |
I |
Enable and disable input for the buck regulator (high-voltage tolerant) internally pulls to ground. Pull this pin up externally to enable the buck regulator. |
EN2 |
7 |
I |
Enable and disable input for the LDO regulator (high-voltage tolerant) internally pulls to ground. Pull this pin up externally to enable the LDO regulator. |
FB1 |
11 |
I |
Feedback pin of the buck regulator. Connect an external resistive divider between the buck regulator output, FB2, and GND to set the desired output voltage of the buck regulator. |
FB2 |
5 |
I |
Feedback pin of the LDO regulator. Connect an external resistive divider between LDO_OUT, FB2, and GND for setting the desired output voltage of the LDO regulator |
GND |
13 |
— |
Ground |
LDO_OUT |
4 |
O |
LDO regulator output |
nRST |
6 |
O |
Active-low, push-pull reset output of the LDO regulator. Connect this pin with an external bias voltage through an external resistor. This pin is asserted high after the LDO regulator begins regulating. |
RT/CLK |
9 |
I |
External resistor connected to ground to program the switching frequency of the buck regulator. An alternative option is to feed an external clock to provide a reference for the switching frequency of the buck regulator. |
SS |
10 |
I |
External capacitor to ground that sets the soft-start time of the buck regulator |
SW |
14 |
I |
Source node of the internal high-side MOSFET of the buck regulator |
VIN |
2 |
— |
Input supply pin for the internal biasing and high-side MOSFET of the buck regulator |
VIN_LDO |
3 |
— |
Input supply pin for the LDO regulator |
Exposed PowerPAD |
— |
Electrically connect the PowerPAD to ground. Solder the PowerPAD to the ground plane of the PCB for thermal performance. |