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TPS65321A-Q1 Datasheet(PDF) 10 Page - Texas Instruments |
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TPS65321A-Q1 Datasheet(HTML) 10 Page - Texas Instruments |
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10 / 43 page  10 TPS65321A-Q1 SLVSE55 – NOVEMBER 2017 www.ti.com Product Folder Links: TPS65321A-Q1 Submit Documentation Feedback Copyright © 2017, Texas Instruments Incorporated 7 Detailed Description 7.1 Overview The TPS65321A-Q1 device is a 36-V, 3.2-A, DC-DC step-down converter (also referred to as a buck regulator) with a 280-mA low-dropout (LDO) linear regulator. Both of these regulators have low quiescent consumption during a light load to prolong battery life. The buck regulator improves performance during line and load transients by implementing a constant-frequency and current-mode control (CCM) that reduces output capacitance which simplifies external frequency- compensation design. The wide switching frequency of 100 kHz to 2500 kHz allows for efficiency and size optimization when selecting the output-filter components. The switching frequency is adjusted by using a resistor to ground on the RT/CLK pin. The buck regulator has an internal phase-locked loop (PLL) on the RT/CLK pin that synchronizes the power-switch turnon to the falling edge of an external system clock. The TPS65321A-Q1 device reduces the external component count by integrating the boot recharge diode. A capacitor between the BOOT pin and the SW pin supplies the bias voltage for the integrated high-side MOSFET. The TPS65321A-Q1 device can operate at high duty cycles under the dropout mode operation. The output voltage can step-down to as low as the 0.8-V reference. The soft start minimizes inrush currents and provides power-supply sequencing during power up. Connect a small-value capacitor to the pin to adjust the soft-start time. For critical power-supply sequencing requirements couple a resistor divider to the pin. The LDO regulator consumes only about a 35-µA current in light load. The LDO regulator also tracks the battery when the battery voltage is low (in a cold-crank condition). The buck regulator of the TPS65321A-Q1 device has a power-good open-drain output (nRST) that asserts low when the regulated output voltage is less than 90% (typical) of the nominal output voltage. |
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