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TPS79625DCQR Datasheet(PDF) 10 Page - Texas Instruments |
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TPS79625DCQR Datasheet(HTML) 10 Page - Texas Instruments |
10 / 18 page www.ti.com Regulator Protection R1 + V O V REF * 1 R2 (2) C1 + (3 x 10–7) x (R1 ) R2) (R1 x R2) (3) OUTPUT VOLTAGE PROGRAMMING GUIDE OUTPUT VOLTAGE R1 R2 C1 GND NR FB IN OUT EN V IN V OUT R1 C1 R2 0.01 µF TPS79601 1 µF 1.8 V 3.6V 14.0 k Ω 57.9 k Ω 30.1 k Ω 30.1 k Ω 33 pF 15 pF 2.2 µF TPS79601, TPS79618, TPS79625 TPS79628, TPS79630, TPS79633 SLVS351D – SEPTEMBER 2002 – REVISED OCTOBER 2004 The recommended design procedure is to choose R2 = 30.1 k Ω to set the divider current at 40 µA, C1 = The TPS796xx PMOS-pass transistor has a built-in 15 pF for stability, and then calculate R1 using back diode that conducts reverse current when the Equation 2: input voltage drops below the output voltage (e.g., during power down). Current is conducted from the output to the input and is not internally limited. If extended reverse voltage operation is anticipated, external limiting might be appropriate. In order to improve the stability of the adjustable The TPS796xx features internal current limiting and version, it is suggested that a small compensation thermal protection. During normal operation, the capacitor be placed between OUT and FB. The TPS796xx limits output current to approximately 2.8 approximate value of this capacitor can be calculated A. When current limiting engages, the output voltage as Equation 3: scales back linearly until the overcurrent condition ends. While current limiting is designed to prevent gross device failure, care should be taken not to exceed the power dissipation ratings of the package. The suggested value of this capacitor for several If the temperature of the device exceeds approxi- resistor ratios is shown in the table below (see mately 165 °C, thermal-protection circuitry shuts it Figure 23). If this capacitor is not used (such as in a down. Once the device has cooled down to below unity-gain configuration) then the minimum rec- approximately 140 °C, regulator operation resumes. ommended output capacitor is 2.2 µF instead of 1 µF. Figure 23. TPS79601 Adjustable LDO Regulator Programming 10 |
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