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TPS715345DCKRG4 Fiches technique(PDF) 8 Page - Texas Instruments |
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TPS715345DCKRG4 Fiches technique(HTML) 8 Page - Texas Instruments |
8 / 16 page Programming the TPS71501 Adjustable LDO Regulator V OUT + VREF 1 ) R1 R2 (3) R1 + V OUT V REF * 1 R2 (4) OUTPUT VOLTAGE PROGRAMMING GUIDE OUTPUT VOLTAGE R1 R2 1.8 V 2.8 V 5.0 V 0.499 M Ω 1.33 M Ω 3.16 M Ω 1 M Ω 1 M Ω 1 M Ω GND FB IN OUT V IN V OUT R 1 C FB R 2 TPS71501 V OUT + VREF 1 ) R1 R2 0.1 µF 0.47 µF Power the MSP430 Microcontroller TPS715xx SLVS338P – MAY 2001 – REVISED NOVEMBER 2008 .................................................................................................................................................... www.ti.com The output voltage of the TPS71501 adjustable regulator is programmed using an external resistor divider as shown in Figure 16. The output voltage operating range is 1.2 V to 15 V, and is calculated using: where: • V REF = 1.205 V typ (the internal reference voltage) 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 VOUT. 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 4: Figure 16. TPS71501 Adjustable LDO Regulator Programming Several versions of the TPS715xx are ideal for powering the MSP430 microcontroller. Table 2 shows potential applications of some voltage versions. Table 2. Typical MSP430 Applications DEVICE VOUT (TYP) APPLICATION TPS71519 1.9 V VOUT, MIN > 1.800 V required by many MSP430s. Allows lowest power consumption operation. TPS71523 2.3 V VOUT, MIN > 2.200 V required by some MSP430s FLASH operation. TPS71530 3.0 V VOUT, MIN > 2.700 V required by some MSP430s FLASH operation. TPS715345 3.45 V VOUT, MIN < 3.600 V required by some MSP430s. Allows highest speed operation. The TPS715xx family offers many output voltage versions to allow designers to minimize the supply voltage for the processing speed required of the MSP430. This minimizes the supply current consumed by the MSP430. 8 Submit Documentation Feedback Copyright © 2001–2008, Texas Instruments Incorporated |
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