FUNCTIONAL DESCRIPTION
FUNCTIONAL INTERNAL BLOCK DESCRIPTION
See Power-Up Sequence on page 28 for more details on
when REG3 is powered up in the sequence.
• Drives integrated low RDS(ON) N-channel power
MOSFETs (NHV_HC) as its output stage
• The output is ±2% accuracy
The switcher will operate in DCM at very light loads to
allow pulse skipping.
• Output voltage is adjustable by means of an external
resistor divider
VOUT3 will be discharged every time the regulator is
shutting down and it will be held low by the discharge FET as
long as possible.
• The output can be adjusted up or down at 2.5% steps for
a total of +17.5% to -20.0% on each direction allowing
Dynamic Voltage Scaling.
Characteristics
• Uses bootstrap networks with an internal diode to power
its high side MOSFETs
• It powers up directly from the battery
• All gate drive circuits are supplied from VG.
• Uses external compensation
• Operates at a switching frequency equals to FSW1
• Drives integrated low RDS(ON) N-channel power
MOSFETs (NHV_HC) as its output stage
• The output is monitored for under-voltage and over-
voltage conditions
• The output is ±4% accuracy
• The output is monitored for over-current and short-circuit
conditions
• Output voltage is adjustable by means of an external
resistor divider
• The regulator is monitored for over-temperature conditions
• The output can be adjusted up or down at 2.5% steps to
achieve from +17.5% to -20.0% on each direction allowing
Dynamic Voltage Scaling using the I2C DVS register.
Operation Modes
• An extra fine voltage scaling in 0.5% steps helps to adjust
down the output voltage as low as 40%.
The switcher will be active when:
• VG is in regulation AND
• There is no GrpB shutdown command through the I2C
interface AND
• Uses a bootstrap network with an internal diode to power
its switch MOSFET
• All gate drive circuits are supplied from VG.
• Uses integrated compensation.
• No faults exist that would cause GrpB to shut down
REG5
• The output is monitored for under-voltage and over-
voltage conditions
This is a 4-switch synchronous buck-boost PWM voltage-
mode control DC/DC regulator.
• The output is monitored for over-current and short-circuit
conditions
See Power-Up Sequence on page 28 on for more details
on when REG5 is powered up in the sequence.
• The regulator is monitored for over-temperature conditions
The switcher will operate in DCM at very light loads to
allow pulse skipping.
Operation Modes
The switcher will be active when:
• VG is in regulation AND
• There is no GrpB shutdown command through the I2C
interface AND
VOUT5 will be discharged every time the regulator is
shutting down and it will be held low by the discharge FET as
long as possible.
Characteristics
• No faults exist that would cause GrpB to shut down
• It powers up directly from the battery
REG4
• Operates at a switching frequency equals to FSW1
This is a 4-switch synchronous buck-boost PWM voltage-
mode control DC/DC regulator.
• Drives integrated low RDS(ON) N-channel power
MOSFETs (NHV_HC) as its output stage
See Power-Up Sequence on page 28 for more details on
when REG4 is powered up in the sequence.
• The output is ±2% accuracy
• Output voltage is adjustable by means of an external
resistor divider
The switcher will operate in DCM at very light loads to
allow pulse skipping.
• The output can be adjusted up or down at 2.5% steps for
a total of +17.5% to -20.0% on each direction allowing
Dynamic Voltage Scaling.
VOUT4 will be discharged every time the regulator is
shutting down and it will be held low by the discharge FET as
long as possible.
• Uses bootstrap networks with an internal diodes to power
its high side MOSFETs
Characteristics
• All gate drive circuits are supplied from VG.
• Uses external compensation
• It powers up directly from the battery
• Operates at a switching frequency equals to FSW1
• The output is monitored for under-voltage and over-
voltage conditions
34704
Analog Integrated Circuit Device Data
Freescale Semiconductor
23
FREESCALE [ Freescale ]
