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R5538 Series

Power Switch IC for Express Card

  • Consumer
  • RoHS

The R5538 is the power interface switch IC for single slot ExpressCard and realizes the total power management function required by ExpressCard. The R5538 distributes 3.3V, 3.3Vaux, and 1.5V to the ExpressCard socket. Each voltage line is protected with a built-in current limit circuit and a thermal shutdown circuit in the R5538.

Specs & Datasheets

Input Voltage Range 1.35 V to 3.6 V (5.0 V)
Operating Temperature Range -40°C to 85°C (125°C)
Supply Current Typ. 5 µA
ON-resistance Typ. 40 mΩ
Internal FET Nch
Package QFN0404-20

Protections / Functions

Functional Description

TSD Reverse OCP UVLO OVLO Soft Start PGOOD Auto Discharge Reset

Technical Documents

Quality & Packages

Product Name Compatibility Package Marking Reliability
  • gradeConsumerC
QFN0404-20 R5538D R5538D-FK

Refer to the datasheets for the details on the product.
The package file includes package dimensions, taping specifications, taping reels dimensions, power dissipations, and recommended land pattern.
Please contact us or our distributors for unpublished reliability information.

Sample / Buy

Functional Description

TSD Thermal Shutdown Function
Reverse Current Protection Reverse Current Protection
OCP Overcurrent Protection
UVLO Undervoltage Lockout Protection
OVLO Overvoltage Lockout Protection
Soft Start Soft Start Function
PGOOD Power Good Output
Auto Discharge Auto Discharge Circuit

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Category:Switch ICs

Features Express Card Power SW
min (V)
max (V)
ON Resistance