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MAX738AEWE Datasheet(PDF) 11 Page - Maxim Integrated Products |
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MAX738AEWE Datasheet(HTML) 11 Page - Maxim Integrated Products |
11 / 16 page Printed Circuit Layouts A good layout is essential for clean, stable operation. The layouts and component placement diagrams given in Figures 4, 5, 6, and 7 have been successfully tested over a wide range of operating conditions. Note that the 1µF bypass capacitor (C2) must be positioned as close to the V+ and GND pins as possible. Also, place the out- put capacitor as close to the OUT and GND pins as pos- sible. The traces connecting the input and output filter capacitors and the catch diode must be short to mini- mize inductance and capacitance. For this reason, avoid using sockets, and solder the IC directly to the PC board. Use an uninterrupted ground plane if possible. Output-Ripple Filtering A simple lowpass pi-filter (Figure 3) can be added to the output to reduce output ripple to about 5mVp-p. The cutoff frequency shown is 21kHz. Since the filter inductor is in series with the circuit output, its resis- tance should be minimized so the voltage drop across it is not excessive. 5V, Step-Down, Current-Mode PWM DC-DC Converters ______________________________________________________________________________________ 11 Table 2. Component Values and Suppliers MAX730AC/MAX738AC/MAX744AC Commercial Temp. Range MAX730AE/M, MAX738AE/M, MAX744AE/M Wide Temp. Range Surface Mount C3 = 68µF, 16V C4 = 100µF, 6.3V Matsuo (714) 969-2491 267 series Sprague (603) 224-1961 595D/293D series L1 = 33µH Sumida (708) 956-0666 CD54-330N (MAX730AC) CD105-330N (MAX738AE/M, MAX744AE/M) Coiltronics (407) 241-7876 CTX50 series C3 = 68µF, 16V C4 = 100µF, 6.3V Matsuo (714) 969-2491 267 series Sprague (603) 224-1961 595D/293D series Miniature Through- Hole L1 = 33µH to 100µH Sumida (708) 956-0666 RCH654-101K (MAX730A) RCH895-101K (MAX738A/MAX744A) C3 = 150µF, 16V C4 = 150µF, 16V or 390µF, 6.3V Nichicon (708) 843-7500 PL series Low-ESR electrolytics L1 = 33µH Sumida (708) 956-0666 RCH654-330M (MAX730A) RCH895-330M (MAX738A/MAX744A) Low-Cost Through- Hole Inductors Capacitors Inductors Capacitors Production Method L1 = 33µH to 100µH Sumida (708) 956-0666 CD54-101KC (MAX730AC) CD105-101KC (MAX738AC/MAX744AC) Coiltronics (407) 241-7876 CTX100 series C3 = 150µF, 16V C4 = 220µF, 10V Sanyo (619) 661-6322 OS-CON series Low-ESR organic semiconductor (Rated from -55°C to +105°C) Mallory (317) 273-0090 THF series C3 = 100µF, 20V C4 = 220µF, 10V (Rated from -55°C to +125°C) L1 = 100µH Maxim MAXL001 100µH iron-power toroid Renco (516) 586-5566 RL1284-100 C3 = 150µF, 16V C4 = 390µF, 6.3V Maxim MAXC001 150µF, low-ESR electrolytic United Chemicon (708) 843-7500 |
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