ADP5042

Rev. 0 | Page 8 of 32

PIN CONFIGURATION AND FUNCTION DESCRIPTIONS

NOTES

1. EXPOSED PAD SHOULD BE CONNECTED TO AGND.

2. NC = NO CONNECT. DO NOT CONNECT TO THIS PIN.

14

13

12

1

3

4

VOUT2

15 WSTAT

VIN2

WDI2

11 VOUT1

NC

VIN3

2

VOUT3

EN3

5

nRSTO

TOP VIEW

AD5042

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

Table 8. Preliminary Pin Function Descriptions

Pin No.

Mnemonic

Description

1

NC

Do not connect to this pin.

2

VOUT3

LDO2 Output Voltage and Sensing Input.

3

VIN3

LDO2 Input Supply (1.7 V to 5.5 V).

4

EN3

Enable LDO2. EN3 = high: turn on LDO2; EN3 = low: turn off LDO2.

5

nRSTO

Open-Drain Reset Output, Active Low.

6

AVIN

Regulators Housekeeping and Supervisory Input Supply (2.3 V to 5.5 V).

7

VIN1

Buck Input Supply (2.3 V to 5.5 V).

8

SW

Buck Switching Node.

9

PGND

Dedicated Power Ground for Buck Regulator.

10

EN1

Enable Buck. EN1 = high: turn on buck; EN1 = low: turn off buck.

11

VOUT1

Buck Sensing Node.

12

WDI2

Watchdog 2 (Long Timeout) Refresh Input from Processor. Can be disabled only by factory option.

13

VIN2

LDO1 Input Supply (1.7 V to 5.5 V).

14

VOUT2

LDO1 Output Voltage and Sensing Input.

15

WSTAT

Open-Drain Watchdog Timeout Status. WSTAT = high: Watchdog 1 timeout or power-on reset; WSTAT = low:

Watchdog 2 timeout. Auto cleared after one second.

16

EN2

Enable LDO1. EN2 = high: turn on LDO1. EN2 = low: turn off LDO1.

17

MODE

Buck Mode. MODE = high: buck regulator operates in fixed PWM mode; MODE = low: buck regulator operates

in pulse skipping mode (PSM) at light load and in constant PWM at higher load.

18

WMOD

Watchdog Mode. WMOD = low: Watchdog 1 normal mode; WMOD = high: Watchdog 1 cannot be disabled by

a three-state condition applied on WDI1.

19

WDI1

Watchdog 1 Refresh Input from Processor. If WDI1 is in high-Z and WMOD is low, Watchdog 1 is disabled.

20

MR

Manual Reset Input, Active Low.

TP

AGND

Analog Ground (TP = Thermal Pad). Exposed pad should be connected to AGND.