CMOS-based Dual Supply Voltage Load Switch IC with Typically 18mΩ ON Resistance
The R5543 Series is a CMOS-based dual supply voltage load switch IC. The R5543 Series is an ideal switch for supplying power from the secondary power source such as the output of a step-down DC/DC converter to the load circuit. A built-in Nch. transistor with typically 18mΩ ON resistance allows the R5543 Series to provide a low dropout voltage and prevents the reverse current during shutdown mode. Internally, a single IC consists of an internal voltage step-up circuit, a soft-start circuit, a thermal shutdown circuit, a chip enable circuit and a UVLO circuit.
The gate voltage of Nch. the driver transistor is supplied by a soft-start circuit. The soft-start circuit is supplied by the external power source (VBIAS). Soft-start time is adjustable by connecting an external capacitor.
The R5543 Series is offered in an ultra-small 6-pin DFN(PLP)1216-6G package which achieves the smallest possible footprint solution on boards where the area is limited.
Typical Application
VOUT Output Voltage On Time vs. Delay Capacitance
VIN = 3.6V, VBIAS = 5.5V, RLOAD = 10Ω, COUT = 0.1µF, Ta = 25℃
Switch On-Resistance vs. Temperature
VBIAS=5.0V, IOUT=500mA
Quality & Packages
About Nisshinbo
New Japan Radio Co., Ltd. and Ricoh Electronic Devices Co., Ltd. of the Nisshinbo Group were integrated and started operation as Nisshinbo Micro Devices Inc. in January 2022. Nisshinbo integrated the strengths of both companies and refine "Connect Everything" technology, and, therefore, strives for further growth and development as an "Analog Solution Provider toward the realization of an ultra-smart society.
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