ADP5135

Data Sheet

Rev. 0 | Page 6 of 24

PIN CONFIGURATION AND FUNCTION DESCRIPTIONS

Figure 2. Pin Configuration—View from the Top of the Die

Table 7. Pin Function Descriptions

Pin No.

Mnemonic

Description

1

PG3

Open-Drain Power-Good Output to Monitor the Output Voltage of BUCK3.

2

PG2

Open-Drain Power-Good Output to Monitor the Output Voltage of BUCK2.

3

VIN2

BUCK2 Input Supply (3.0 V to 5.5 V). Connect VIN2 to VIN1, VIN3, and AVIN.

4

SW2

BUCK2 Switching Node.

5

PGND2

Dedicated Power Ground for BUCK2.

6

PG1

Open-Drain Power-Good Output to Monitor the Output Voltage of BUCK1.

7

EN2

BUCK2 Enable. A high level turns on this regulator, and a low level turns it off.

8

FB2

BUCK2 Feedback Input. For device models with an adjustable output voltage, connect this pin to the middle of the

BUCK2 resistor divider. For device models with a fixed output voltage, leave this pin unconnected.

9

VOUT2

BUCK2 Output Voltage Sensing Input. Connect VOUT2 to the top of the capacitor on VOUT2.

10

VOUT1

BUCK1 Output Voltage Sensing Input. Connect VOUT1 to the top of the capacitor on VOUT1.

11

FB1

BUCK1 Feedback Input. For device models with an adjustable output voltage, connect this pin to the middle of the

BUCK1 resistor divider. For device models with a fixed output voltage, leave this pin unconnected.

12

EN1

BUCK1 Enable. A high level turns on this regulator, and a low level turns it off.

13

MODE

BUCK1/BUCK2 Operating Mode. MODE = high: forced PWM operation. MODE = low: auto PWM/PSM operation.

14

PGND1

Dedicated Power Ground for BUCK1.

15

SW1

BUCK1 Switching Node.

16

VIN1

BUCK1 Input Supply (3.0 V to 5.5 V). Connect VIN1 to VIN2, VIN3, and AVIN.

17

AVIN

Analog Input Supply (3.0 V to 5.5 V). Connect AVIN to VIN1, VIN2, and VIN3.

18

AGND

Analog Ground.

19

PGND3

Dedicated Power Ground for BUCK3.

20

SW3

BUCK3 Switching Node.

21

VIN3

BUCK3 Input Supply (3.0 V to 5.5 V). Connect VIN3 to VIN1, VIN2 and AVIN.

22

VOUT3

BUCK3 Output Voltage Sensing Input. Connect VOUT3 to the top of the capacitor on VOUT3.

23

FB3

BUCK3 Feedback Input. For device models with an adjustable output voltage, connect this pin to the middle of the

BUCK3 resistor divider. For device models with a fixed output voltage, leave this pin unconnected.

24

EN3

BUCK3 Enable. A high level turns on this regulator, and a low level turns it off.

EP

Exposed Pad. Solder the exposed pad to the ground plane.

2

1

3

4

5

6

18

17

16

15

14

13

PG1

PGND2

SW2

VIN2

PG2

PG3

MODE

PGND1

SW1

VIN1

AVIN

AGND

ADP5135

TOP VIEW

(Not to Scale)

NOTES

1. SOLDER THE EXPOSED PAD TO THE GROUND

PLANE WITH SEVERAL VIAS.