Information

• Automatic current limiting if the load current is greater than 290 mA.
• Automatic power-up once some voltage is applied to the regulator input.
• Pass-through mode for regulator input voltages less than 3.6 V
• Small output capacitor: 2.2 uF
• Stable with aluminum, tantalum or ceramic capacitors.
42.1.3 Modes of Operation
The regulator has these power modes:
• RUN—The regulating loop of the RUN regulator and the STANDBY regulator are
active, but the switch connecting the STANDBY regulator output to the external pin
is open.
• STANDBY—The regulating loop of the RUN regulator is disabled and the standby
regulator is active. The switch connecting the STANDBY regulator output to the
external pin is closed.
• SHUTDOWN—The module is disabled.
The regulator is enabled by default. This means that once the power supply is provided,
the module power-up sequence to RUN mode starts.
42.2 USB Voltage Regulator Module Signal Descriptions
The following table shows the external signals for the regulator.
Table 42-1. USB Voltage Regulator Module Signal Descriptions
Signal Description I/O
reg33_in Unregulated power supply I
reg33_out Regulator output voltage O
Chapter 42 USB Voltage Regulator
K20 Sub-Family Reference Manual, Rev. 2, Feb 2012
Freescale Semiconductor, Inc. 955