5 Pin Configuration and Functions

Figure 5-1 DQN Package,1-mm × 1-mm, 4-Pin X2SON(Top View)

Figure 5-2 DBV Package,5-Pin SOT-23(Top View)

Table 5-1 Pin Functions: DQN, DBV

PIN			I/O⁽¹⁾	DESCRIPTION
NAME	DQN	DBV	I/O⁽¹⁾	DESCRIPTION
EN	3	3	Input	Enable pin. Driving this pin to logic high enables the device; driving this pin to logic low or floating this pin disables the device. This pin features an internal pulldown resistor, which is disconnected when EN is driven high externally and the device has started up.
GND	2	2	—	Ground pin. This pin must be connected to ground on the board.
IN	4	1	Input	Input pin. For best transient response and to minimize input impedance, use the recommended value or larger ceramic capacitor from IN to ground; see the Section 6.3 table. Place the input capacitor as close to the input of the device as possible.
NC	—	4	—	No connect pin. This pin is not internally connected. Connect to ground or leave floating.
OUT	1	5	Output	Regulated output pin. A 0.5-µF or greater effective capacitance is required from OUT to ground for stability. For best transient response, use a 1-µF or larger ceramic capacitor from OUT to ground. Place the output capacitor as close to output of the device as possible; see the Section 6.3 table.
Thermal pad		––	—	Connect the thermal pad to a large-area ground plane. The thermal pad is internally connect to ground.

(1) NC = No internal connection.

Figure 5-3 YCH Package,4-Pin DSBGA, 0.35-mm Pitch(Top View)

Figure 5-4 YCH Package,4-Pin DSBGA, 0.35-mm Pitch(Bottom View)

Table 5-2 Pin Functions: YCH

PIN		I/O	DESCRIPTION
YCH	NAME	I/O	DESCRIPTION
A1	IN	Input	Input pin. For best transient response and to minimize input impedance, use the recommended value or larger ceramic capacitor from IN to ground; see the Section 6.3 table. Place the input capacitor as close to input of the device as possible.
A2	OUT	Output	Regulated output pin. A 0.5-µF or greater effective capacitance is required from OUT to ground for stability. For best transient response, use a 1-µF or larger ceramic capacitor from OUT to ground. Place the output capacitor as close to output of the device as possible; see the Section 6.3 table.
B1	EN	Input	Enable pin. Driving this pin to logic high enables the device; driving this pin to logic low or floating this pin disables the device. This pin features an internal pulldown resistor, which is disconnected when EN is driven high externally and the device has started up.
B2	GND	—	Ground pin. This pin must be connected to ground and the thermal pad.