MC34713EP Freescale, MC34713EP Datasheet - Page 12

• Manufacturer Part Number: MC34713EP
• Manufacturer: Freescale

Specifications of MC34713EP

• Operating Temperature (max): 85C
• Operating Temperature (min): -40C
• Pin Count: 24
• Mounting: Surface Mount
• Package Type: QFN
• Case Length: 4mm
• Screening Level: Industrial
• Lead Free Status / RoHS Status: Compliant

CONTROL AND SUPERVISORY FUNCTIONS
contains the following circuits:
TRACKING AND SEQUENCING
voltage applied at the VREFIN pin in different tracking
configurations. This will be discussed in further details later in
this document. For power down during a shutdown mode, the
34713 uses internal discharge MOSFET
discharge the output. The discharge MOSFET is only active
12
34713
FUNCTIONAL DESCRIPTION
FUNCTIONAL INTERNAL BLOCK DESCRIPTION
• Output over-voltage and under-voltage monitoring: This
This block is used to interface with an outside host. It
• Shutdown control input: An outside host can put the
• Power good output signal PG: The 34713 can
This block allows the output of the 34713 to track the
threshold, this block will alert the system control for
further commands.
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.
34713 device into shutdown mode by sending a logic
“0” to the SD pin.
communicate to an external host that a fault has
occurred by releasing the drive on the PG pin high,
allowing the signal/pin to be pulled high by the external
pull-up resistor.
(Figure
2) to
during shutdown mode. Using this block along with
controlling the SD pin can offer the user power sequencing
capabilities by controlling when to turn the 34713 output on or
off.
BUCK CONVERTER
DC conversion from an un-regulated input voltage to a
regulated output voltage used by the loads for reliable
operation. The buck converter is a high performance, fixed
frequency (externally adjustable), synchronous buck PWM
voltage-mode control. It drives integrated 50 m
power MOSFETs saving board space and enhancing
efficiency. The switching regulator output voltage is
adjustable with an accuracy of less than ±2% to meet today’s
requirements. Its output has the ability to track the voltage
applied at the VREFIN pin. The regulator's voltage control
loop is compensated using a type III compensation network,
with external components to allow for optimizing the loop
compensation, for a wide range of operating conditions. A
typical bootstrap circuit with an internal PMOS switch is used
to provide the voltage necessary to properly enhance the
high side MOSFET gate.
continuous current, making it suitable for many high current
applications.
This block provides the main function of the 34713: DC to
The 34713 has the ability to supply up to 5.0 A of
Analog Integrated Circuit Device Data
Freescale Semiconductor
Ω
N-channel