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TPS54336DRC Datasheet(PDF) 9 Page - Texas Instruments |
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TPS54336DRC Datasheet(HTML) 9 Page - Texas Instruments |
9 / 40 page 2.000 2.100 2.200 2.300 ±50 ±25 0 25 50 75 100 125 150 T J - Junction Temperature (C) C013 4.0 4.5 5.0 5.5 6.0 4 8 12 16 20 24 28 V IN - Input Voltage (V) TJ = -40 S TJ = 25 S TJ = 150 S C014 T J = -40SC T J = 25SC T J = 150SC TPS54335 TPS54336 www.ti.com SLVSC03B – MAY 2013 – REVISED NOVEMBER 2013 TYPICAL CHARACTERISTICS (continued) BOOT-PH UVLO THRESHOLD CURRENT LIMIT THRESHOLD vs vs JUNCTION TEMPERATURE INPUT VOLTAGE Figure 13. Figure 14. 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 has been designed for safe monotonic startup into pre-biased loads. It has a typical default start up voltage of 4.0 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 PH 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 minimizes excessive output over-voltage transients by taking advantage of the over-voltage power good comparator. When the regulated output voltage is greater than 106% 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 104%. The TPS54335 has wide switching frequency of 50 kHz to 1500 kHz which allows for efficiency and size optimization when selecting the output filter components. The internal 2ms slow start time is implemented to minimize inrush currents. The TPS54336 is fixed at 340kHz. It is able to adjust the slow start time by the SS pin. Copyright © 2013, Texas Instruments Incorporated Submit Documentation Feedback 9 Product Folder Links: TPS54335 TPS54336 |
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