Data Sheet

ADP2387

Rev. C | Page 7 of 25

PIN CONFIGURATION AND FUNCTION DESCRIPTIONS

2

1

3

4

5

6

18

17

16

15

14

13

SW

SW

GND

VREG

FB

COMP

PGND

25

GND

26

SW

SW

BST

PVIN

PVIN

PVIN

NOTES

1. THE EXPOSED GND PAD MUST BE SOLDERED

TO A LARGE, EXTERNAL, COPPER GND PLANE

TO REDUCE THERMAL RESISTANCE.

2. THE EXPOSED SW PAD MUST BE CONNECTED

TO THE SW PINS OF THE ADP2387 BY USING

SHORT, WIDE TRACES, OR ELSE SOLDERED

TO A LARGE, EXTERNAL, COPPER SW PLANE

TO REDUCE THERMAL RESISTANCE.

ADP2387

TOP VIEW

(Not to Scale)

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 8 V Regulator. The control circuits are powered from this voltage. Place a 1 µF, X7R or

X5R ceramic capacitor between this pin and GND.

4

GND

Analog Ground. This pin is the return of the internal control circuit.

5 to 7, 14

SW

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

8 to 13

PGND

Power Ground. This pin is the return of the 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 Inputs. 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 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). Connecting a pull-up resistor of 10 kΩ to 100 kΩ to this pin is recommended.

22

RT

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

200 kHz to 1400 kHz.

23

ILIM

Current-Limit Threshold Setting. Connect a resistor between ILIM and GND to program the current-limit

threshold.

24

SS

Soft Start Control. Connect a capacitor from SS to GND to program the soft start time. If this pin is open, the

regulator uses the internal soft start time.

25

EP, GND

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

26

EP, SW

The exposed SW pad must be connected to the SW pins of the ADP2387 by using short, wide traces, or else

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