Datasheet

4-Feb-2022

CFR0011-120-01

Revision 1.04

Page 10 of 18

SLG59M1735C

A 10.5 mΩ, 4 A Load Switch

with Soft-start and Protection Features in WLCSP

©2022 Renesas Electronics Corporation

SLG59M1735C Power-Up/Power-Down Sequence Considerations

To ensure glitch-free power-up under all conditions, apply VDD first, followed by VD after VDD exceeds 1 V. Then allow VD to reach

90% of its max value before toggling the ON pin from Low-to-High. Likewise, power-down in reverse order.

If VDD and VD need to be powered up simultaneously, glitching can be minimized by having a suitable load capacitor. A 10 µF

CLOAD will prevent glitches for rise times of VDD and VD higher than 2 ms.

If the ON pin is toggled HIGH before VDD and VD have reached their steady-state values, the load switch timing parameters may

differ from datasheet specifications.

The slew rate of output VS follows a linear ramp set by a capacitor connected to the CAP pin. A larger capacitor value at the CAP

pin produces a slower ramp, reducing inrush current from capacitive loads.

SLG59M1735C Voltage Limitation

VD may not exceed VDD for proper operation otherwise the Active Current Limit cannot function properly.

SLG59M1735C Current Limiting

The SLG59M1735C has two modes of current limiting, differentiated by the output (Source pin) voltage.

1. Standard Current Limiting Mode (with Thermal Protection)

When VS > 250 mV, the output current is initially limited to the Active Current Limit specification given in the Electrical Charac-

teristics table. The current limiting circuit is very fast and responds within a few micro-seconds to sudden loads. When overload

is sensed, the current limiting circuit increases the FET resistance to keep the current from exceeding the Active Current Limit.

However, if an overload condition persists, the die temperature rise due to the increased FET resistance while at maximum current

can activate Thermal Protection. If the die temperature exceeds the THERMON specification, the FET is shut completely OFF,

allowing the die to cool. When the die cools to the THERMOFF temperature, the FET is allowed to turn back on. This process may

repeat as long as the overload condition is present.

2. Short Circuit Current Limiting Mode (with Thermal Protection)

When VS < 250 mV (which is the case with a hard short, such as a solder bridge on the power rail), the current is limited to

approximately 500 mA. Thermal Protection is also present, but since the Short Circuit Current Limit is much lower than Standard

Current Limit, activation may only occur at higher ambient temperatures.

For more information on GreenFET load switch features, please visit our website and see App Note “AN-1068 GreenFET and

High Voltage GreenFET Load Switch Basics”.