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FUNCTIONAL DESCRIPTION
FUNCTIONAL INTERNAL BLOCK DESCRIPTION
FUNCTIONAL INTERNAL BLOCK DESCRIPTION
MC34712 - Functional Block Diagram
Internal Bias Circuits
Protection Functions
System Control and Logic
Control and
Supervisory Functions
Oscillator
Tracking and Sequencing
Buck Converter
Figure 5. 34712 Internal Block Diagram
INTERNAL BIAS CIRCUITS
This block contains all circuits that provide the necessary
supply voltages and bias currents for the internal circuitry. It
consists of:
? Internal voltage supply regulator: This regulator
supplies the V DDI voltage that is used to drive the digital/
analog internal circuits. It is equipped with a Power-On-
Reset (POR) circuit that watches for the right regulation
levels. External filtering is needed on the VDDI pin. This
block will turn off during the shutdown mode.
? Internal bandgap reference voltage: This supplies the
reference voltage to some of the internal circuitry.
? Bias circuit: This block generates the bias currents
necessary to run all of the blocks in the IC.
SYSTEM CONTROL AND LOGIC
This block is the brain of the IC where the device
processes data and reacts to it. Based on the status of the
STBY and SD pins, the system control reacts accordingly and
orders the device into the right status. It also takes inputs
from all of the monitoring/protection circuits and initiates
power up or power down commands. It communicates with
the buck converter to manage the switching operation and
protects it against any faults.
OSCILLATOR
This block generates the clock cycles necessary to run the
IC digital blocks. It also generates the buck converter
switching frequency. The switching frequency has a default
value of 1.0 MHz and can be programmed by connecting a
resistor divider to the FREQ pin, between VDDI and GND
pins (See Figure 1 ).
PROTECTION FUNCTIONS
This block contains the following circuits:
? Over-current limit and short-circuit detection: This block
monitors the output of the buck converter for over
current conditions and short circuit events and alerts the
system control for further command.
? Thermal limit detection: This block monitors the
temperature of the device for overheating events. If the
temperature rises above the thermal shutdown
threshold, this block will alert the system control for
further commands.
? Output over-voltage and under-voltage monitoring: This
block monitors the buck converter output voltage to
ensure it is within regulation boundaries. If not, this
block alerts the system control for further commands.
CONTROL AND SUPERVISORY FUNCTIONS
This block is used to interface with an outside host. It
contains the following circuits:
? Standby control input: An outside host can put the
34712 device into standby mode (S3 or Suspend-To-
RAM mode) by sending a logic “0” to the STBY pin.
? Shutdown control input: An outside host can put the
34712 device into shutdown mode (S5 or Suspend-To-
Disk mode) by sending a logic “0” to the SD pin.
? Power good output signal PG: The 34712 can
communicate to an external host that a fault has
34712
Analog Integrated Circuit Device Data ?
12
Freescale Semiconductor
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