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ADP5034ACPZ-2-R7 数据表(PDF) 20 Page - Analog Devices |
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ADP5034ACPZ-2-R7 数据表(HTML) 20 Page - Analog Devices |
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20 / 28 page  ADP5034 Data Sheet Rev. A | Page 20 of 28 The peak-to-peak output voltage ripple for the selected output capacitor and inductor values is calculated using the following equation: () OUT SW IN OUT SW RIPPLE RIPPLE C L f V C f I V × × × π ≈ × × = 2 2 8 Capacitors with lower effective series resistance (ESR) are preferred to guarantee low output voltage ripple, as shown in the following equation: RIPPLE RIPPLE COUT I V ESR ≤ The effective capacitance needed for stability, which includes temperature and dc bias effects, is a minimum of 7 μF and a maximum of 40 μF. The buck regulators require 10 μF output capacitors to guaran- tee stability and response to rapid load variations and to transition into and out of the PWM/PSM modes. A list of suggested capaci- tors is shown in Table 9. In certain applications where one or both buck regulator powers a processor, the operating state is known because it is controlled by software. In this condition, the processor can drive the MODE pin according to the operating state; consequently, it is possible to reduce the output capacitor from 10 μF to 4.7 μF because the regulator does not expect a large load variation when working in PSM mode (see Figure 50). Input Capacitor Higher value input capacitors help to reduce the input voltage ripple and improve transient response. Maximum input capacitor current is calculated using the following equation: IN OUT IN OUT MAX LOAD CIN V V V V I I ) ( ) ( − ≥ To minimize supply noise, place the input capacitor as close as possible to the VINx pin of the buck. As with the output capacitor, a low ESR capacitor is recommended. The effective capacitance needed for stability, which includes temperature and dc bias effects, is a minimum of 3 μF and a maximum of 10 μF. A list of suggested capacitors is shown in Table 9 and Table 10. Table 9. Suggested 10 μF Capacitors Vendor Type Model Case Size Voltage Rating (V) Murata X5R GRM188R60J106 0603 6.3 TDK X5R C1608JB0J106K 0603 6.3 Panasonic X5R ECJ1VB0J106M 0603 6.3 Table 10. Suggested 4.7 μF Capacitors Vendor Type Model Case Size Voltage Rating (V) Murata X5R GRM188R60J475ME19D 0402 6.3 Taiyo Yuden X5R JMK107BJ475 0402 6.3 Panasonic X5R ECJ-0EB0J475M 0402 6.3 Table 11. Suggested 1.0 μF Capacitors Vendor Type Model Case Size Voltage Rating (V) Murata X5R GRM155B30J105K 0402 6.3 TDK X5R C1005JB0J105KT 0402 6.3 Panasonic X5R ECJ0EB0J105K 0402 6.3 Taiyo Yuden X5R LMK105BJ105MV-F 0402 10.0 VIN1 VIN3 EN1 PWM PSM/PWM 2.3V TO 5.5V SW1 FB1 R2 R1 VOUT1 PGND1 MODE C5 10µF VOUT1 @ 1200mA L1 1µH EN1 BUCK1 MODE C3 1µF C2 4.7µF C1 4.7µF AVIN CAVIN 0.1µF C4 1µF VIN2 EN2 AGND EN2 BUCK2 MODE EN3 1.7V TO 5.5V EN4 VIN4 ON OFF ON OFF ON OFF EN3 LDO1 (ANALOG) ADP5034 HOUSEKEEPING SW2 FB2 R4 R3 VOUT2 PGND2 C6 10µF VOUT2 @ 1200mA L2 1µH FB3 R6 R5 VOUT3 C7 1µF VOUT3 @ 300mA FB4 R8 R7 VOUT4 C8 1µF VOUT4 @ 300mA EN4 LDO2 (DIGITAL) Figure 50. Processor System Power Management with PSM/PWM Control |
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