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TPS54334DRCR Datasheet(PDF) 9 Page - Texas Instruments |
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TPS54334DRCR Datasheet(HTML) 9 Page - Texas Instruments |
9 / 37 page 9 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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