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TPS73018YZQR Datasheet(PDF) 11 Page - Texas Instruments |
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TPS73018YZQR Datasheet(HTML) 11 Page - Texas Instruments |
11 / 31 page GND NR FB IN OUT EN V IN V OUT R 1 C 1 R 2 1 F m 2.2 F m 0.01 F m TPS73001 OUTPUTVOLTAGE PROGRAMMINGGUIDE R 1 R 2 C 1 2.5V 3.3V 3.6V 1.22V OUTPUT VOLTAGE 31.6kW short 51kW 59kW open 30.1kW 30.1kW 30.1kW 0pF 22pF 15pF 15pF 7 1 2 1 1 2 ( 3 1 0 ) (R R ) C (R R ) u u u R = 1 - 1 ´ R2 V OUT V REF 1 O U T R E F 2 R V V 1 R § · u ¨ ¸ © ¹ TPS730 www.ti.com SBVS054J – NOVEMBER 2004 – REVISED APRIL 2015 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 TPS730 family of low-dropout (LDO) regulators has been optimized for use in noise-sensitive battery- operated equipment. The device features extremely low dropout voltages, high PSRR, ultra-low output noise, low quiescent current (170 μA typically), and enable-input to reduce supply currents to less than 1 μA when the regulator is turned off. 8.1.1 Adjustable Operation The output voltage of the TPS73001 adjustable regulator is programmed using an external resistor divider as shown in Figure 17. The output voltage is calculated using Equation 1: Where: • VREF = 1.225 V typical (the internal reference voltage) (1) Resistors R1 and R2 should be chosen for approximately 50-μA divider current. Lower value resistors can be used for improved noise performance, but the solution consumes more power. Higher resistors values can cause accuracy issues and other problems. The recommended design procedure is to choose R2 = 30.1 kΩ to set the divider current at 50 μA, C1 = 15 pF for stability, and then calculate R1 using Equation 2: (2) To improve the stability of the adjustable version, TI suggests placing a small compensation capacitor between OUT and FB. For output voltages < 1.8 V, the value of this capacitor should be 100 pF. For output voltages > 1.8 V, use Equation 3 to calculate the approximate value of this capacitor. (3) Figure 17 shows the suggested value of this capacitor for several resistor ratios. If this capacitor is not used (such as in a unity-gain configuration) or if an output voltage < 1.8 V is chosen, then the minimum recommended output capacitor is 4.7 μF instead of 2.2 μF. Figure 17. TPS73001 Adjustable LDO Regulator Programming Copyright © 2004–2015, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Links: TPS730 |
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