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MC34726AFCR2 Fiches technique(PDF) 11 Page - Freescale Semiconductor, Inc

No de pièce MC34726AFCR2
Description  300mA High Efficiency Low Quiescent Current Synchronous Buck Regulator With Z-mode
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Fabricant  FREESCALE [Freescale Semiconductor, Inc]
Site Internet  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

MC34726AFCR2 Fiches technique(HTML) 11 Page - Freescale Semiconductor, Inc

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Analog Integrated Circuit Device Data
Freescale Semiconductor
11
34726
FUNCTIONAL DESCRIPTION
FUNCTIONAL INTERNAL BLOCK DESCRIPTION
FUNCTIONAL INTERNAL BLOCK DESCRIPTION
Figure 14. 34726 Functional Internal Block Diagram
INTEGRATED SUPPLY
INTERNAL REGULATOR AND REFERENCE
The internal regulator and reference block steps down the
high input voltage to lower voltage, to power all the internal
blocks, and provides the reference voltage for the other
internal blocks.
OSCILLATOR
The oscillator block provides 2.0MHz clock signal to the
controller.
CONTROLLER
THERMAL SHUTDOWN
The thermal shutdown block monitors the die temperature.
Once the die temperature reaches its threshold, this block
turns off the device to prevent the further die temperature
rise.
SOFT-START
The soft-start block controls the output voltage ramp after
the device is enabled, to limit the in-rush current. The start-up
time is internally set to approximately 2.0ms, and is
independent of input voltage, output voltage, or load current.
The soft-start sequence also occurs upon recovery from any
fault condition.
UVLO
The UVLO block monitors the input voltage. Once the
input voltage is lower than the falling threshold voltage, this
block turns off the device, to avoid unpredictable circuit
behavior.
CURRENT LIMIT
The current limit block monitors the inductor current. When
the peak inductor current reaches its current limit, this block
turns off the high side MOSFET, to prevent the device and
external components from damage.
POWER-MOSFET DRIVER
The power-MOSFET-driver block controls the phase of the
diver signals and enhances the drive capability of these
POWER-MOSFET
The power-MOSFET block contains two power
MOSFETs. One is a PMOS that passes the current from the
input to the output, and the other one is an NMOS that
provides the inductor current loop when PMOS is turned off.
MC34726 - Functional Block Diagram
Integrated Supply
Oscillator
MOSFET
Control
Integrated Supply
Internal Regulator & Reference
Control
Oscillator
Power MOSFET Driver
Undervoltage Lockout
Power MOSFET
Thermal Shutdown
Soft Start
Current Limit


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