Datasheet

8-Feb-2022

CFR0011-120-01

Revision 1.07

Page 13 of 19

SLGC55544CV

USB Charging Port Power Switch and Controller

©2022 Renesas Electronics Corporation

Wake On USB

The SLGC55544CV supports low and full speed HID (human interface device like mouse/keyboard) wake function. There are

two scenarios under which wake on mouse are supported by the SLGC55544CV. The specific CTL pin changes that the

SLGC55544CV will override are shown below. The information is presented as CTL1, CTL2, CTL3. The ILIM_SEL pin plays no

role.

1. 111 (CDP/SDP2) to 011 (DCP-Auto)

2. 010 (SDP1) to 011 (DCP-Auto)

Note that the 110 (SDP1) to 011 (DCP-Auto) transition is not supported. This is done for practical reasons since the transition

involves changes to two CTL pins. Depending on which CTL pin changes first, the device will see either a temporary 111 or 010

command. The 010 command is safe but the 111 command will cause an OUT discharge as the SLGC55544CV will instead

proceed to the 111 state.

Output Discharge

To allow a charging port to renegotiate current with a portable device, SLGC55544CV uses the VBUS discharge function. It

proceeds by turning off the power switch while discharging VOUT, then turning back ON the power switch to reassert the VOUT

voltage. This discharge function is automatically applied when a change at the CTLx lines results in any of the following mode

transitions.

•

Any transition to and from CDP

•

Any transition to and from SDP

In addition to this, can be achieved using the mode “000”.

Overcurrent Protection

When an over-current condition is detected, the device maintains a constant output current and reduces the output voltage

accordingly. Two possible overload conditions can occur. In the first condition, the output has been shorted before the device is

enabled or before VIN has been applied.

The SLGC55544CV senses the short and immediately switches into a constant-current output. In the second condition, a short

or an overload occurs while the device is enabled. At the instant the overload occurs, high currents may flow for nominally one

to two microseconds before the current-limit circuit can react. The device operates in constant-current mode after the current-limit

circuit has responded. Complete shutdown occurs only if the fault is present long enough to activate thermal limiting. The device

will remain off until the junction temperature cools approximately 10°C and will then re-start. The device will continue to cycle

on/off until the over-current condition is removed.

FAULT# Response

The FAULT# open-drain output is asserted (active low) during an over-temperature or current limit condition. The output remains

asserted until the fault condition is removed. The SLGC55544CV is designed to eliminate false FAULT# reporting by using an

internal deglitch circuit for current limit conditions without the need for external circuitry. This ensures that FAULT# is not

Trans-State Time

Transition From

Transition To

Discharge Time (Typ.)

SDP1

CDP

2 s

SDP1

DCP

2 s

CDP

SDP1

2 s

CDP

DCP

2 s

CDP

SDP2

No Discharge

SDP2

CDP

No Discharge

DCP

SDP1,2

250 ms

DCP

CDP

250 ms