MC34704 FREESCALE [Freescale Semiconductor, Inc], MC34704 Datasheet - Page 25

• Manufacturer Part Number: MC34704
• Description: Multiple Channel DC-DC Power Management IC
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

• Output voltage is adjustable by means of an external
• A 240mV current limit comparator will be used to program/
• The output can be adjusted up or down at 2.5% steps for
• Maximum output current is adjustable by means of an
Analog Integrated Circuit Device Data
Freescale Semiconductor
resistor divider when in voltage regulation mode
sense the voltage drop across the current setting resistor
at the bottom of the LED string connected
output when the current regulation mode is selected
This will be used to program the maximum current flowing
and will regulate it
a total of 10% on each direction allowing Dynamic Voltage
Scaling
external resistor connected to the FB8 pin and then the
output current can be scaled down from the set maximum
in 16 steps through I
2
C interface
to the REG8
.
• Uses a bootstrap network with an internal diode to power
• All gate drive circuits are supplied from VG.
• Uses integrated compensation
• The output is monitored for over-current and short-circuit
• The regulator is monitored for over-temperature conditions
• The output is monitored for under-voltage and over-
Operation Modes
• VG is in regulation AND
• There is no GrpD shutdown command through the I
• No faults exist that would cause GrpD to shut down
its synchronous MOSFET
conditions
voltage conditions
The switchers will be active when:
interface AND
FUNCTIONAL INTERNAL BLOCK DESCRIPTION
FUNCTIONAL DESCRIPTION
2
C
34704
25