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REG71050DDCT Datasheet(PDF) 8 Page - Texas Instruments |
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REG71050DDCT Datasheet(HTML) 8 Page - Texas Instruments |
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8 / 15 page  Table 1. Suggested Capacitors REG710 SBAS221E − DECEMBER 2001 − REVISED SEPTEMBER 2003 www.ti.com 8 CAPACITOR SELECTION For minimum output voltage ripple, the output capacitor COUT should be a ceramic, surface-mount type. Tantalum capacitors generally have a higher Effective Series Resist- ance (ESR) and may contribute to higher output voltage ripple. Leaded capacitors also increase ripple due to the higher inductance of the package itself. To achieve best operation with low input voltage and high load current, the input and pump capacitors (CIN and CPUMP, respectively) should also be surface-mount ceramic types. In all cases, X7R or X5R dielectric are recommended. See the typical operating circuit shown in Figure 3 for component values. V IN Enable V OUT GND REG710 C IN 2.2 µF C OUT 2.2 µF C PUMP 0.22 µF 46 3 5 1 2 Figure 3. Typical Operating Circuit With light loads or higher input voltage, a smaller 0.1 µF pump capacitor (CPUMP) and smaller 1µF input and output capacitors (CIN and COUT, respectively) can be used. To minimize output voltage ripple, increase the output capaci- tor, COUT, to 10µF or larger. The capacitors listed in Table 1 can be used with the REG710. This is only a representative list of those parts that are compatible. EFFICIENCY The efficiency of the charge pump regulator varies with the output voltage version, the applied input voltage, the load current, and the internal operation mode of the device. The approximate efficiency is given by: Efficiency (%) = VOUT/(2 × VIN) × 100 (step-up operating mode) or V OUT V IN 100 (step-down operating mode) Table 2 lists the approximate values of the input voltage at which the device changes internal operating mode. See efficiency curves in the Typical Characteristics section for various loads and input voltages. Table 2. Operating Mode Change Versus VIN PRODUCT OPERATING MODE CHANGES AT V OF PRODUCT OPERATING MODE CHANGES AT VIN OF REG710-2.5 > 3.2V REG710-2.7 > 3.4V REG710-3 > 3.7V REG710-3.3 > 4.0V REG710-5, REG71050, REG71055 Step-Up Only LAYOUT Large transient currents flow in the VIN, VOUT, and GND traces. To minimize both input and output ripple, keep the capacitors as close as possible to the regulator using short, direct circuit traces. A suggested PCB routing is shown in Figure 4. The trace lengths from the input and output capacitors have been kept as short as possible. V ENABLE V IN C IN GND C P V OUT C OUT AREA: < 0.08 sq. inches Figure 4. Suggested PCB Design for Minimum Ripple MANUFACTURER PART NUMBER VALUE TOLERANCE DIELECTRIC PACKAGE RATED WORKING MANUFACTURER PART NUMBER VALUE TOLERANCE DIELECTRIC MATERIAL PACKAGE SIZE RATED WORKING VOLTAGE MANUFACTURER PART NUMBER VALUE TOLERANCE MATERIAL SIZE WORKING VOLTAGE Kemet C1206C255K8RAC 2.2 µF ±10% X7R 1206 10V C1206C224K8RAC 0.22 µF ±10% X7R 1206 10V Panasonic ECJ−2YBOJ225K 2.2 µF ±10% X5R 805 6.3V ECJ−2VBIC224K 0.22 µF ±10% X7R 805 16V ECJ−2VBIC104 0.1 µF ±10% X7R 805 16V Taiyo Yuden EMK316BJ225KL 2.2 µF ±10% X7R 1206 16V TKM316BJ224KF 0.22 µF ±10% X7R 1206 25V |
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