ADP5043

Data Sheet

Rev. C | Page 8 of 30

PIN CONFIGURATION AND FUNCTION DESCRIPTIONS

NOTES

1. EXPOSED PAD SHOULD BE CONNECTED TO AGND.

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

THE PIN SHOULD BE LEFT FLOATING.

14

13

12

1

3

4

NC

15 WSTAT

GND

WDI2

11 VOUT1

NC

VIN2

2

VOUT2

EN2

5

nRSTO

ADP5043

TOP VIEW

(Not to Scale)

Figure 2. Pin Configuration

Table 8. Pin Function Descriptions

Pin No.

Mnemonic

Description

1, 14

NC

No Connect. Do not connect to this pin. The pin should be left floating.

2

VOUT2

LDO Output Voltage and Sensing Input.

3

VIN2

LDO Input Supply (1.7 V to 5.5 V).

4

EN2

Enable LDO. EN2 = high: turn on the LDO; EN2 = low: turn off the LDO.

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. This pin can be disabled only by a factory option.

13, 16

GND

Connect to the ground plane.

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.

17

MODE

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

regulator operates in power save 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. WMOD has an internal 200 kΩ pull-down resistor connected to AGND.

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.

EPAD

Exposed Pad. The exposed pad should be connected to analog ground (AGND).