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MAX619ESA Datasheet(PDF) 6 Page - Maxim Integrated Products |
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MAX619ESA Datasheet(HTML) 6 Page - Maxim Integrated Products |
6 / 7 page Regulated 5V Charge-Pump DC-DC Converter 6 ________________________________________________________________________________________ Table 1. Capacitor Suppliers * Note: (SM) denotes surface-mount component, (TH) denotes through-hole component. __________Applications Information Capacitor Selection Charge-Pump Capacitors C1 and C2 The values of charge-pump capacitors C1 and C2 are critical to ensure adequate output current and avoid excessive peak currents. Use values in the range of 0.22 µF to 1.0µF. Larger capacitors (up to 50µF) can be used, but larger capacitors will increase output rip- ple. Ceramic or tantalum capacitors are recommend- ed. Input and Output Capacitors, C3 and C4 The type of input bypass capacitor (C3) and output fil- ter capacitor (C4) used is not critical, but it does affect performance. Tantalums, ceramics, or aluminum elec- trolytics are suggested. For smallest size, use Sprague 595D106X0010A2 surface-mount capacitors, which measure 3.7mm x 1.8mm (0.146in x 0.072in). For low- est ripple, use large, low effective-series-resistance (ESR) ceramic or tantalum capacitors. For lowest cost, use aluminum electrolytic or tantalum capacitors. Figure 2 shows the component values for proper oper- ation using minimal board space. The input bypass capacitor (C3) and output filter capacitor (C4) should both be at least 10 µF when using aluminum electrolyt- ics or Sprague’s miniature 595D series of tantalum chip capacitors. When using ceramic capacitors, the values of C3 and C4 can be reduced to 2 µF and 1µF, respectively. If the input supply source impedance is very low, C3 may not be necessary. Many capacitors exhibit 40% to 50% variation over temperature. Compensate for capacitor temperature coefficient by selecting a larger nominal value to ensure proper operation over temperature. Table 1 lists capacitor suppliers. MAX619 C4 10µF IN C1+ C1– OUT SHDN C2+ C2– GND 7 4 5 6 2 1 8 3 C3 10µF 2 CELLS C1 0.22µF C2 0.22µF 5V ±4% @ 20mA Figure 2. Two-Cell to 5V Application Circuit 10 µF tantalum (SM) 595D106X0010A2 (603) 224-1430 (207) 324-7223 (603) 224-1961 (207) 327-4140 Sprague Electric (smallest size) 0.1 µF ceramic (TH) RPE121Z5U104M50V (814) 238-0490 (814) 237-1431 Murata Erie 1.0 µF ceramic (TH) RPI123Z5U105M50V 0.22 µF ceramic (SM) GRM42-6Z5U22M50 0.1 µF ceramic (SM) GRM42-6Z5U10M50 CAPACITOR TYPE* CAPACITOR FAX NUMBER PHONE NUMBER SUPPLIER |
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