CP2101 Datasheet, PDF (13/14 Pages) List of Unclassifed Manufacturers – Single-Chip USB to UART Bridge

Preliminary
CP2101
9. VOLTAGE REGULATOR
The CP2101 is designed to be a USB bus-powered device taking power from the USB VBUS signal. It includes an
on-chip 5 V-to-3 V voltage regulator for this purpose. The 3 V output of the voltage regulator appears on the VDD
pin allowing external 3 V devices to be powered from the USB. See Table 9.1 for the voltage regulator's electrical
specifications.
Note: both the VBUS and REGIN pins of the CP2101 should always be connected to the USB VBUS signal. It is rec-
ommended that additional decoupling capacitance (ex. 0.1µF in parallel with 1.0µF) be provided on the REGIN input.
Table 9.1. Voltage Regulator Electrical Specifications
VDD = 3.0 V; -40°C to +85°C unless otherwise specified
PARAMETER
CONDITIONS
Input Voltage Range
Output Voltage
Output Current = 1 to 100 mA
VBUS Detection Input Threshold
Bias Current
MIN TYP MAX UNITS
4.0
5.25 V
3.0 3.3 3.6 V
1.0 1.8 4.0 V
90 TBD µA
© 2003 Cygnal Integrated Products, Inc. DS014-1.0 AUG03
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