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MAX1651 Datasheet(PDF) 11 Page - Maxim Integrated Products |
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MAX1651 Datasheet(HTML) 11 Page - Maxim Integrated Products |
11 / 12 page Input Bypass Capacitor The input bypass capacitor reduces peak currents drawn from the voltage source, and also reduces the amount of noise at the voltage source caused by the switching action of the MAX1649/MAX1651. The input voltage source impedance determines the size of the capacitor required at the V+ input. As with the output fil- ter capacitor, a low-ESR capacitor is recommended. Bypass the IC separately with a 0.1µF ceramic capac- itor placed close to the V+ and GND pins. Reference Capacitor Bypass REF with a 0.1µF or larger capacitor. 5V/3.3V or Adjustable, High-Efficiency, Low-Dropout, Step-Down DC-DC Controllers ______________________________________________________________________________________ 11 ___________________Chip Topography TRANSISTOR COUNT: 428 SUBSTRATE CONNECTED TO V+ 0.106" (2.692mm) 0.081" (2.057mm) OUT GND CS EXT V+ FB SHDN REF Table 2. Component Suppliers COMPANY PHONE FAX (207) 282-5111 AVX USA or (207) 283-1941 (800) 282-4975 Coiltronics USA (407) 241-7876 (407) 241-9339 CoilCraft USA (708) 639-6400 (708) 639-1469 Dale USA (402) 564-3131 (402) 563-1841 International USA (310) 322-3331 (310) 322-3332 Rectifier IRC USA (512) 992-7900 (512) 992-3377 (602) 244-3576 Motorola USA or (602) 244-4015 (602) 244-5303 Nichicon USA (708) 843-7500 (708) 843-2798 Japan 81-7-5231-8461 81-7-5256-4158 Nihon USA (805) 867-2555 (805) 867-2556 Japan 81-3-3494-7411 81-3-3494-7414 Sanyo USA (619) 661-6835 (619) 661-1055 Japan 81-7-2070-6306 81-7-2070-1174 (408) 988-8000 Siliconix USA or (408) 970-3950 (800) 554-5565 Sprague USA (603) 224-1961 (603) 224-1430 Sumida USA (708) 956-0666 (708) 956-0702 Japan 81-3-3607-5111 81-3-3607-5144 United USA (714) 255-9500 (714) 255-9400 Chemi-Con Layout Considerations Proper PC board layout is essential because of high current levels and fast switching waveforms that radi- ate noise. Minimize ground noise by connecting the anode of the rectifier, the input bypass capacitor ground lead, and the output filter capacitor ground lead to a single point (“star” ground configuration). A ground plane is recommended. Also minimize lead lengths to reduce stray capacitance, trace resistance, and radiated noise. In particular, the traces connected to FB (if an external resistor divider is used) and EXT must be short. Place the 0.1µF ceramic bypass capac- itor as close as possible to the V+ and GND pins. MAX1649/MAX1651 vs. MAX649/MAX651 The MAX1649 and MAX1651 are pin compatible with the MAX649 and MAX651, but have been optimized for improved dropout performance and efficiency—partic- ularly with low input voltages. The MAX1649/MAX1651 feature increased maximum switch duty cycle (96.5%) and reduced current-limit sense voltage (110mV). Their predecessors, the MAX649/MAX651, use a high- er two-step (210mV/110mV) current-limit sense voltage to provide tighter current-sense accuracy and reduced inductor peak current at light loads. |
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