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TPS72525DCQG4 Datasheet(PDF) 9 Page - Texas Instruments |
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TPS72525DCQG4 Datasheet(HTML) 9 Page - Texas Instruments |
9 / 22 page www.ti.com APPLICATION INFORMATION External Capacitor Requirements Programming the TPS72501 Adjustable LDO Regulator V O + V ref 1 ) R1 R2 (1) R1 + V O V ref * 1 R2 (2) VO VI OUT FB R1 R2 GND EN IN TPS72501 1 µF Co OUTPUT VOLTAGE PROGRAMMING GUIDE (Standard 1% Resistor Values) PROGRAM VOLTAGE R1 (K Ω) R2 (kΩ) 1.8 V 2.5 V 3.3 V 3.6 V ACTUAL VOLTAGE 56.2 127 196 205 118 121 115 105 1.801 2.500 3.299 3.602 1.22 V ≤ 0.4 V ≥ 1.3 V TPS72501 TPS72515, TPS72516 TPS72518, TPS72525 SLVS341D – MAY 2002 – REVISED MARCH 2004 The TPS725xx family of low-dropout (LDO) regulators has numerous features that make it applicable to a wide range of applications. The family operates with very low input voltage ( ≥1.8 V) and low dropout voltage (typically 200 mV at full load), making it an efficient stand-alone power supply or post regulator for battery or switch mode power supplies. Both the active low RESET and 1-A output current make the TPS725xx family ideal for powering processor and FPGA supplies. The TPS725xx family also has low output noise (typically 150 µVRMS with 10-µF output capacitor), making it ideal for use in telecom equipment. A 1-µF or larger ceramic input bypass capacitor, connected between IN and GND and located close to the TPS725xx, is required for stability. To improve transient response, noise rejection, and ripple rejection, an additional 10-µF or larger, low ESR capacitor is recommended. A higher-value, low ESR input capacitor may be necessary if large, fast-rise-time load transients are anticipated and the device is located several inches from the power source, especially if the minimum input voltage of 1.8 V is used. Although an output capacitor is not required for stability, transient response and output noise are improved with a 10-µF output capacitor. The output voltage of the TPS72501 adjustable regulator is programmed using an external resistor divider as shown in Figure 19. The output voltage is calculated using: Where: • VFB = VREF = 1.22 V typical (see the electrical characteristics for VREF range) Resistors R1 and R2 should be chosen for approximately 10-µA divider current. Lower value resistors offer no inherent advantage and waste more power. Higher values should be avoided as leakage currents at FB increase the output voltage error. The recommended design procedure is to choose R2 = 120 k Ω to set the divider current at 10 µA and then calculate R1 using: Figure 19. TPS72501 Adjustable LDO Regulator Programming 9 |
Similar Part No. - TPS72525DCQG4 |
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Similar Description - TPS72525DCQG4 |
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