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AAT3190ITP-1-T1 Datasheet(PDF) 11 Page - Advanced Analogic Technologies |
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AAT3190ITP-1-T1 Datasheet(HTML) 11 Page - Advanced Analogic Technologies |
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11 / 16 page  AAT3190 Positive/Negative Charge Pump for Voltage Bias 3190.2005.03.1.0 11 With R2 selected, R1 can be determined: V OP The positive output voltage is set by way of a resis- tive divider from the output (V OP) to the FBP and ground pin. Limiting the size of R4 reduces the effect of the FBP bias current. For less than 0.1% error, limit R4 to less than 12k Ω. Once R4 has been determined, solve for R3: Flying and Output Capacitor The flying capacitor minimum value is limited by the output power requirement, while the maximum value is set by the bandwidth of the power supply. If C FLY is too small, the output may not be able to deliver the power demanded, while too large of a capacitor may limit the bandwidth and time required to recover from load and line transients. A 0.1µF X7R or X5R ceramic capacitor is typically used. The voltage rating of the flying and reservoir output capacitors varies with the number of charge pump stages. The reservoir output capacitor should be roughly 10 times the flying capacitor. Use larger capacitors for reduced output ripple. A 1µF X7R or X5R type ceramic is typically used. Positive Output Capacitor Voltage Ratings The absolute steady-state maximum output voltage (neglecting the internal R DS(ON) drop of the internal MOSFETs) for the nth stage is: where V FWD is the estimated forward drop of the Schottky diode. This is also the voltage rating required for the nth bulk capacitor in the positive output charge pump. The voltage rating for the nth flying capacitor in the positive stage is: where V BULK(0) is the input voltage. (See Table 1.) Table 1: Positive Output Capacitor Voltages. Negative Output Capacitor Voltage Ratings The absolute steady-state maximum output voltage (neglecting the internal R DS(ON) drop of the internal MOSFETs) for the nth stage is: This is also the voltage rating required for the nth bulk capacitor in the negative output charge pump. VBULK(n) = -n · VIN + 2 · n · VFWD V IN = 5.0V, VFWD = 0.3V Stages (n) V BULK(n) V FLY(n) 1 9.4V 4.7V 2 13.8V 9.1V 3 18.2V 13.5V 4 22.6V 17.9V 5 27.0V 22.3V 6 31.4V 26.7V VFLY(n) = VBULK(n + 1) - VFWD VBULK(n) = (n + 1) · VIN - 2 · n · VFWD R3 = R4 · - 1 VO VREF ⎛⎞ ⎝⎠ IFBP IPGM = = 0.1% 0.1µA 100µA VREF R4 IPGM = = = 100µA 1.2V 12kΩ VNEG · R2 -VREF R1 = |
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