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Chapter 34
USB Voltage Regulator (VREG)
34.1 Introduction
The USB Voltage Regulator module is a LDO linear voltage regulator to provide 3.3V
power from an input power supply varying from 2.7 V to 5.5 V. It consists of one 3.3 V
power channel. When the input power supply is below 3.6 V, the regulator goes to pass-
through mode. The following figure shows the ideal relation between the regulator output
and input power supply.
OUTPUT
(Volt)
3.3
2.1
Figure 34-1. Ideal Relation Between the Regulator Output and Input Power Supply
34.1.1 Overview
A simplified block diagram for the USB Voltage Regulator module is shown below.
Freescale Semiconductor, Inc.
2.7
3.6
KL27 Sub-Family Reference Manual , Rev. 5, 01/2016
5.5
INPUT (Volt)
563
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