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MAX16963 Datasheet(PDF) 10 Page - Maxim Integrated Products |
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MAX16963 Datasheet(HTML) 10 Page - Maxim Integrated Products |
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10 / 13 page  10 Maxim Integrated MAX16963 Dual 2.2MHz, Low-Voltage Step-Down DC-DC Converter where m2 is the inductor current down slope: OUT V L and -m is the slope compensation: × µ× REF CS 0.8 V sG Solving for L: µ = × ×× MIN2 OUT REF CS s LV 1.6 V G The equation that provides the bigger inductor value must be chosen for proper operation. = MIN MIN1 MIN2 L max(L , L ) Then: = × MAX MIN L 2L The maximum inductor value must not exceed the cal- culated value from the above formula. This ensures that the current feedback loop receives the correct amount of current ripple for proper operation. Table 1 lists some of the inductor values for 1.5A output current and several output voltages. Input Capacitor The input filter capacitor reduces peak currents drawn from the power source and reduces noise and voltage ripple on the input caused by the circuit’s switching. The input capacitor RMS current requirement (IRMS) is defined by the following equation: ( ) OUT_ PV_ OUT_ RMS LOAD(MAX) PV_ V VV I I IRMS has a maximum value when the input voltage equals twice the output voltage (VPV_ = 2VOUT_), so IRMS(MAX) = ILOAD(MAX)/2. Choose an input capacitor that exhibits less than +10NC self-heating temperature rise at the RMS input current for optimal long-term reliability. The input-voltage ripple is composed of DVQ (caused by the capacitor discharge) and DVESR (caused by the ESR of the capacitor). Use low-ESR ceramic capacitors with high-ripple current capability at the input. Assume the contribution from the ESR and capacitor discharge equal to 50%. Calculate the input capacitance and ESR required for a specified input voltage ripple using the fol- lowing equations: ESR IN L OUT_ V ESR I I 2 ∆ = ∆ + where: ( ) PV_ OUT_ OUT_ L PV_ SW VV V I V fL − × ∆= ×× and: OUT_ IN Q SW I D(1 D) C Vf × − = ∆× and OUT_ PV_ V D V = where IOUT_ is the maximum output current, and D is the duty cycle. Table 2. Output Capacitor Value vs. VOUT_ Setting Table 1. Inductor Values vs. (VIN - VOUT) VOUT (V) 3.3 2.5 1.5 0.8 COUT (µF), ILOAD = 1.5A ≥ 12 ≥ 15 ≥ 25 ≥ 48 VIN - VOUT (V) 5.5 to 3.3 5.5 to 2.5 5.5 to 1.5 3.0 to 0.8 INDUCTOR (µH), ILOAD = 1.5A 1.5 1.5 1.0 0.68 |
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