PIN

NAME

FUNCTION

1

SRC_DMOS1

External DMOS Source Input. Connect to the source of the external n-channel DMOS device.

Connect a 1µF ceramic capacitor between the SRC_DMOS2 pin and ground.

2

PV

SRC_DMOS1 and SRC_DMOS2 High-Side Current-Limited Switching-Supply Input. Connect PV to

the DC-DC converter output (e.g., OUT). Connect a 47µF capacitor between PV and ground.

3

OUT

Synchronous Buck Feedback Voltage-Sense Input. Connect OUT to the output of the DC-DC

converter.

4

FOSC

Synchronous Buck Switching-Frequency Setting. Connect a resistor between FOSC and ground to

set the switching frequency.

5

ILIM

Synchronous Switching Power-MOSFET Forward-Current-Limit Set Point. Connect a resistor

between ILIM and ground to set the current limit.

6

BST

Bootstrap Capacitor for the High-Side Power-MOSFET Driver. Connect a 0.1µF capacitor between

BST and LX.

7

LX

Synchronous Buck Converter Output. Connect to the switched-side of the power inductor.

8

PGND

Power Ground. Ground return for the internal low-side power MOSFET.

9

SUPSW

Bias Supply Input and Internal High-Side Switch Supply. Connect a 47µF ceramic capacitor at the

board edge. Connect a 10µF capacitor between SUPSW and PGND, as close as possible to the

device.

10

HVEN

Active-High Enable Input for the Device (BIAS, DC-DC). HVEN is high-voltage compatible. Drive

HVEN high to initiate the startup sequence and enable normal operation.

11

BIAS

5V Bias LDO Output. Connect a 2.2µF ceramic capacitor between BIAS and ground, as close as

possible to the pin.

12

SRC_DMOS2

External DMOS Source Input. Connect to the source of the external n-channel DMOS device.

Connect a 1µF ceramic capacitor between the SRC_DMOS2 pin and ground.

13

COMP

Error-Amplifier Output. Connect an RC network from COMP to ground for stable operation. See the

Compensation Network section more details.

14

AGND

Analog Ground Return

15

G_DMOS

DMOS Gate-Drive Output. Connect to the gates of the external n-channel DMOS devices.

16

CONFIG

Sets the Hold Startup Configuration. Connect a resistor to ground for target operation (see Table 4)

17

HVDP1

Protected USB1 D+ Connection. Connect HVDP1 to the D+ pin on the USB1 connector.

18

HVDM1

Protected USB1 D- Connection. Connect HVDM1 to the D- pin on the USB1 connector.

19

HVDP2

Protected USB2 D+ Connection. Connect HVDP2 to the D+ pin on the USB2 connector.

20

HVDM2

Protected USB2 D- Connection. Connect HVDM2 to the D- pin on the USB2 connector.

Pin Description

MAX20047

Dual 3A USB DCP Charger

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