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TPS71550QDCKRQ1 Datasheet(PDF) 9 Page - Texas Instruments |
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TPS71550QDCKRQ1 Datasheet(HTML) 9 Page - Texas Instruments |
9 / 20 page 1.8 V 2.8 V 5 V OUTPUT VOLTAGE PROGRAMMING GUIDE OUTPUT VOLTAGE R1 R2 3.16 MW 1 MW 1 MW 1 MW VO VI FB R1 R2 GND IN TPS71501 0.1 µF 0.47 µF OUT 1.33 MW 0.499 MW O ref V R1 1 R2 V æ ö = - ´ ç ÷ è ø O ref R1 V V 1 R2 æ ö = ´ + ç ÷ è ø 9 TPS71501-Q1, TPS71525-Q1, TPS71530-Q1, TPS71533-Q1, TPS71550-Q1 www.ti.com SGLS272H – OCTOBER 2004 – REVISED DECEMBER 2015 Product Folder Links: TPS71501-Q1 TPS71525-Q1 TPS71530-Q1 TPS71533-Q1 TPS71550-Q1 Submit Documentation Feedback Copyright © 2004–2015, Texas Instruments Incorporated 8 Application and Implementation NOTE Information in the following applications sections is not part of the TI component specification, and TI does not warrant its accuracy or completeness. TI’s customers are responsible for determining suitability of components for their purposes. Customers should validate and test their design implementation to confirm system functionality. 8.1 Application Information The TPS715xx-Q1 family of LDO regulators has been optimized for ultra-low power applications such as the MSP430 microcontroller. Its ultralow supply current maximizes efficiency at light loads and its high input voltage range makes it suitable for supplies such as unconditioned solar panels. 8.1.1 Programming the TPS71501 Adjustable LDO Regulator The output voltage of the TPS71501 adjustable regulator is programmed using an external resistor divider as shown in Figure 15. The output voltage is calculated using Equation 1. where • VREF = 1.205 V typ (the internal reference voltage) (1) Resistors R1 and R2 should be chosen for approximately 1.5- μA divider current. Lower value resistors can be used for improved noise performance, but the solution consumes more power. Higher resistor values should be avoided as leakage current into/out of FB across R1/R2 creates an offset voltage that artificially increases/decreases the feedback voltage and thus erroneously decreases/increases VO. The recommended design procedure is to choose R2 = 1 M Ω to set the divider current at 1.5 μA and then calculate R1 using Equation 2. (2) Figure 15. TPS71501 Adjustable LDO Regulator Programming |
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