Data Sheet

ADP2443

Rev. 0 | Page 7 of 24

PIN CONFIGURATION AND FUNCTION DESCRIPTIONS

2

1

3

4

5

6

18

17

16

15

14

13

SW

SW

GND

VREG

FB

COMP

PGND

SW

BST

PVIN

PVIN

PVIN

25

GND

ADP2443

TOP VIEW

(Not to Scale)

26

SW

NOTES

1. EXPOSED GND PAD. THE EXPOSED GND PAD MUST

BE SOLDERED TO A LARGE, EXTERNAL, COPPER

GND PLANE TO REDUCE THERMAL RESISTANCE.

2. EXPOSED SW PAD. THE EXPOSED SW PAD MUST

BE CONNECTED TO THE SW PINS OF THE ADP2443

BY USING SHORT, WIDE TRACES, OR SOLDERED

TO A LARGE EXTERNAL SW COPPER PLANE TO

REDUCE THERMAL RESISTANCE.

Figure 4. Pin Configuration

Table 4. Pin Function Descriptions

Pin No.

Mnemonic

Description

1

COMP

Error Amplifier Output. Connect an RC network from COMP to GND.

2

FB

3

VREG

Output of the Internal 5 V Regulator. The control circuits are powered from the voltage on this pin. Place a 1 µF,

X7R or X5R ceramic capacitor between this pin and GND.

4

GND

Analog Ground. Return of internal control circuit.

5, 6, 7, 14

SW

Switch Node Output. Connect these pins to the output inductor.

8 to 13

PGND

Power Ground. Return of low-side power MOSFET.

15

BST

Supply Rail for the High-Side Gate Drive. Place a 0.1 µF, X7R or X5R capacitor between SW and BST.

16 to 19

PVIN

Power Input. Connect these pins to the input power source and connect a bypass capacitor between these pins and

PGND.

20

EN

Precision Enable Pin. An external resistor divider can be used to set the turn-on threshold. To enable the device

automatically, connect the EN pin to the PVIN pin.

21

PGOOD

Power-Good Output (Open-Drain). A pull-up resistor of 10 kΩ to 100 kΩ is recommended.

22

RT/SYNC

Frequency Setting (RT). Connect a resistor between RT and GND to program the switching frequency between

200 kHz to 1.8 MHz.

Synchronization Input (SYNC). Connect this pin to an external clock to synchronize the switching frequency

between 200 kHz and 1.8 MHz. See the Oscillator section and the Synchronization section for more information.

23

RAMP

Slope Compensation Setting. Connect a resistor from RAMP to PVIN to set the slope compensation.

24

SS

Soft Start Control. Connect a capacitor from SS to GND to program the soft start time.

25

EP, GND

Exposed GND Pad. The exposed GND pad must be soldered to a large, external, copper GND plane to reduce

thermal resistance.

26

EP, SW

Exposed SW Pad. The exposed SW pad must be connected to the SW pins of the ADP2443 by using short, wide

traces, or soldered to a large external SW copper plane to reduce thermal resistance.