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TPS54334DRCR Datasheet(PDF) 9 Page - Texas Instruments

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No. de pieza TPS54334DRCR
Descripción Electrónicos  Synchronous Step-Down Voltage Converter
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Fabricante Electrónico  TI1 [Texas Instruments]
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TPS54334DRCR Datasheet(HTML) 9 Page - Texas Instruments

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TPS54334
www.ti.com
SLUSC26A – MAY 2015 – REVISED FEBRUARY 2016
Product Folder Links: TPS54334
Submit Documentation Feedback
Copyright © 2015–2016, Texas Instruments Incorporated
7 Detailed Description
7.1 Overview
The device is a 28-V, 3-A, synchronous step-down (buck) converter with two integrated n-channel MOSFETs. To
improve performance during line and load transients the device implements a constant frequency, peak current
mode control which reduces output capacitance and simplifies external frequency compensation design.
The device is designed for safe monotonic startup into pre-biased loads. It has a typical default start up voltage
of 3.9 V. The EN pin has an internal pull-up current source that can provide a default condition when the EN pin
is floating for the device to operate. The total operating current for the device is typically 310µA when not
switching and under no load. When the device is disabled, the supply current is less than 5
μA.
The integrated 128m
Ω/84mΩ MOSFETs allow for high efficiency power supply designs with continuous output
currents up to 3 amperes.
The device reduces the external component count by integrating the boot recharge diode. The bias voltage for
the integrated high-side MOSFET is supplied by a capacitor between the BOOT and SW pins. The boot capacitor
voltage is monitored by an UVLO circuit and turns off the high-side MOSFET when the voltage falls below a
preset threshold. The output voltage can be stepped down to as low as the 0.8 V reference.
The device has a power good comparator (PGOOD) with hysteresis which monitors the output voltage through
the VSENSE pin. The PGOOD pin is an open drain MOSFET which is pulled low when the VSENSE pin voltage
is less than 84% or greater than 116% of the reference voltage Vref and asserts high when the VSENSE pin
voltage is 90% to 110% of the Vref.
The device minimizes excessive output over-voltage transients by taking advantage of the over-voltage power
good comparator. When the regulated output voltage is greater than 116% of the nominal voltage, the over-
voltage comparator is activated, and the high-side MOSFET is turned off and masked from turning on until the
output voltage is lower than 110%.
The TPS54334 operating frequency is fixed at 570 kHz and at 2 ms slow start time.


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