mcf51jf128 Freescale Semiconductor, Inc, mcf51jf128 Datasheet - Page 1018

• Manufacturer Part Number: mcf51jf128
• Description: Mcf51jf128 Reference Manual
• Manufacturer: Freescale Semiconductor, Inc

Power
Supply
Introduction
This module uses 2 regulators in parallel. In run mode, the RUN regulator with the
bandgap voltage reference is enabled and can provide up to 120 mA load current. In run
mode, the STANDBY regulator and the low power reference are also enabled, but a
switch disconnects its output from the external pin. In STANDBY mode, the RUN
regulator is disabled and the STANDBY regulator output is connected to the external pin
supplying up to 3 mA load current.
Internal power mode signals control whether the module is in RUN or STANDBY mode.
41.1.2 Features
1018
• Low drop-out linear voltage regulator with one power channel (3.3V).
• Low drop-out voltage: 300 mV.
• Output current: 120 mA.
• Three different power modes: RUN, STANDBY and SHUTDOWN.
• Low quiescent current in RUN mode.
• Very low quiescent current in STANDBY mode.
• Automatic current limiting if the load current is greater than 290 mA.
• Automatic power-up once some voltage is applied to the regulator input.
• Typical value is around 120 uA (one thousand times smaller than the maximum
• Typical value is around 1 uA.
load current).
reg33_in
Figure 41-2. USB Voltage Regulator Block Diagram
STANDBY Regulator
RUN Regulator
MCF51JF128 Reference Manual, Rev. 2, 03/2011
Voltage Regulator
Voltage Regulator
No
Preliminary
Yes
reg33_out
STANDBY
Other Modules
Chip
Freescale Semiconductor, Inc.
Regulated Output
Voltage
ESR: 5m -> 100m Ohms
External Capacitor
typical = 2.2uF