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TPS71334DRCT Datasheet(PDF) 10 Page - Texas Instruments |
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TPS71334DRCT Datasheet(HTML) 10 Page - Texas Instruments |
10 / 20 page www.ti.com PROGRAMMING THE TPS71202 C1 + (3 105) (R1 ) R2) (R1 R2) (pF) (3) V OUT + VREF 1 ) R1 R2 (1) DROPOUT VOLTAGE R1 + V OUT V REF * 1 R2 (2) VOUT2 1.225 V 1.5 V 2.5 V 3.0 V 3.3 V 4.75 V R1 Short 7.15 k Ω 31.6 k Ω 43.2 k Ω 49.9 k Ω 86.6 k Ω R2 Open 30.1 k Ω 30.1 k Ω 30.1 k Ω 30.1 k Ω 30.1 k Ω Output Voltage Programming Guide C1 Open 100 pF 22 pF 15 pF 15 pF 15 pF TPS71334 GND NR FB2 IN OUT1 EN1 OUT2 EN2 RESET V IN V OUT1 V OUT2 0.1 µF 2.2 µF 2.2 µF C1 0.01 µF R1 R2 TPS71319 TPS71334 SBVS055A – DECEMBER 2004 – REVISED JANUARY 2005 ADJUSTABLE LDO REGULATOR The output voltage of the TPS71202 dual adjustable The suggested value of this capacitor for several regulator is programmed using an external resistor resistor ratios is shown in Figure 25. If this capacitor divider, as shown in Figure 24. The output voltage is is not used (such as in a unity-gain configuration) or if calculated using Equation 1: an output voltage ≤ 1.8 V is chosen, then the minimum recommended output capacitor is 4.7 µF instead of 2.2 µF. where VREF = 1.225 V (the internal reference volt- age). The TPS713xx uses a PMOS pass transistor to Resistors R2 and R4 should be chosen for approxi- achieve extremely low dropout. When (VIN - VOUT) is mately a 40 µA divider current. Lower value resistors less than the dropout voltage (VDO), the PMOS pass can be used for improved noise performance, but will device is in its linear region of operation and the consume more power. Higher values should be input-to-output resistance is the RDS, ON of the PMOS avoided because leakage current at FB increases the pass element. Dropout voltages at lower currents can output voltage error. The recommended design pro- be approximated by calculating the effective RDS, ON cedure is to choose R2 = 30.1 k Ω to set the divider of the pass element and multiplying that resistance by current at 40 µA, and then calculate R1 using the load current. RDS, ON of the pass element can be Equation 2: obtained by dividing the dropout voltage by the rated output current. For the TPS71334, the RDS, ON of the pass element is 84 m Ω. The dropout voltage of the TPS713xx will be less for higher output voltage versions. This is because the PMOS pass element To improve the stability and noise performance of the will have lower on-resistance due to increased gate adjustable version, a small compensation capacitor drive. can be placed between OUT and FB. For voltages ≤ 1.8 V, the value of this capacitor should be 100 pF. For voltages > 1.8 V, the approxi- mate value of this capacitor can be calculated as Equation 3: Figure 25. TPS71334 Adjustable LDO Regulator Programming 10 |
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