5 Pin Configuration and Functions

Figure 5-1 DDA Package, 8-Pin HSOIC(Top View)

Table 5-1 Pin Functions

PIN		TYPE	DESCRIPTION
NAME	NO.	TYPE	DESCRIPTION
GND	1	G	Power and analog ground terminal. All electrical parameters are measured with respect to this pin. Connect a high-quality bypass capacitor directly to this pin and VIN with short and wide traces.
EN	2	A	Enable input to regulator. High = ON, low = OFF. Can be connected directly to VIN. Do not float.
VIN	3	P	Input supply to the regulator. Connect a high-quality bypass capacitor or capacitors directly to this pin and GND with short and wide traces.
RT/SYNC	4	A	Resistor timing or external clock input. An internal amplifier holds this pin at a fixed voltage when using an external resistor to ground to set the switching frequency. If the pin is pulled above the PLL upper threshold, a mode change occurs and the pin becomes a synchronization input. The internal amplifier is disabled and the pin is a high impedance clock input to the internal PLL. If clocking edges stop, the internal amplifier is re-enabled and the operating mode returns to frequency programming by resistor.
FB	5	A	Feedback input to the regulator. Connect to tap point of the feedback voltage divider. Do not float. Do not ground.
PG	6	A	Open-drain power-good flag output. Connect to a suitable voltage supply through a current limiting resistor. High = power OK, low = power bad. The flag pulls low when EN = low. Can be left open when not used.
BOOT	7	P	Bootstrap supply voltage for the internal high-side driver. Connect a high-quality 100-nF capacitor from this pin to the SW pin.
SW	8	P	Regulator switch node. Connect to a power inductor.
EP	THERMAL PAD	Thermal	Connect to system ground.