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TPS65321A-Q1 Datasheet(PDF) 20 Page - Texas Instruments |
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TPS65321A-Q1 Datasheet(HTML) 20 Page - Texas Instruments |
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20 / 43 page  Hysteresis VI (V) ON OFF 8.5 9 O _ ea 1 P2 Type 1 2π R C2 = ´ ´ O _ ea 1 P2 Type 2B 2π R3 C = ´ ´ 1 P2 Type 2A 2π R3 C2 = ´ ´ 1 Z1 2π R3 C1 = ´ ´ O _ ea 1 P1 2π R C1 = ´ ´ ea O _ ea R2 A1 gm R || R3 R1 R2 = ´ ´ + 20 TPS65321A-Q1 SLVSE55 – NOVEMBER 2017 www.ti.com Product Folder Links: TPS65321A-Q1 Submit Documentation Feedback Copyright © 2017, Texas Instruments Incorporated Feature Description (continued) (15) (16) (17) (18) (19) (20) 7.3.2 LDO Regulator The LDO regulator on the TPS65321A-Q1 device can be used to supply low power consumption rails. The quiescent current in standby mode is about 35 µA under typical operating condition. The LDO regulator require both supplies from VIN and VIN_LDO to function. The current capability of the LDO regulator is 280 mA under the full VIN_LDO input range, while V(VIN) ≥ 4 V. When VIN becomes less than 4 V, the current capability of the LDO regulator decreases. 7.3.2.1 Charge-Pump Operation The LDO regulator has an internal charge-pump that turns on or off depending on the input voltage. The charge- pump switching circuitry does not cause conducted emissions to exceed required thresholds on the input voltage line. The charge-pump switching thresholds are hysteretic. Figure 15 shows the typical switching thresholds for the charge pump. Figure 15. Charge-Pump Switching Thresholds Table 1. Typical Quiescent Current Consumption CHARGE PUMP ON CHARGE PUMP OFF LDO IQ 300-µA 35 µA 7.3.2.2 Low-Voltage Tracking At low input voltages, the regulator drops out of regulation, and the output voltage tracks input minus a drop out voltage (VDROPOUT). This feature allows for a smaller input capacitor and can possibly eliminate the need to use a boost convertor during cold-crank conditions. |
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