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MAX797MJE Datasheet(PDF) 11 Page - Maxim Integrated Products |
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MAX797MJE Datasheet(HTML) 11 Page - Maxim Integrated Products |
11 / 32 page Step-Down Controllers with Synchronous Rectifier for CPU Power ______________________________________________________________________________________ 11 Table 1. Component Selection for Standard 3.3V Applications Table 2. Component Suppliers * Distributor losses due to MOSFET gate charge. The step-down power-switching circuit consists of two N-channel MOSFETs, a rectifier, and an LC output filter. The out- put voltage is the average of the AC voltage at the switching node, which is adjusted and regulated by changing the duty cycle of the MOSFET switches. The gate-drive signal to the N-channel high-side MOSFET must exceed the battery voltage and is provided by a flying capacitor boost circuit that uses a 100nF capaci- tor connected to BST. The MAX796 contains nine major circuit blocks, which are shown in Figure 2. [1] 714-960-6492 (714) 969-2491 Matsuo [1] 512-992-3377 (512) 992-7900 IRC [1] 310-322-3332 (310) 322-3331 International Rectifier [1] 605-665-1627 (605) 668-4131 Dale [1] 561-241-9339 (561) 241-7876 Coiltronics [1] 847-639-1469 (847) 639-6400 Coilcraft [1] 516-435-1824 (516) 435-1110 Central Semiconductor [1] 803-626-3123 (803) 946-0690 AVX FACTORY FAX [Country Code] USA PHONE MANUFACTURER [1] 864-963-6521 (864) 963-6300 Kemet 1.5µH, 11A, 3.5m Ω Coiltronics CTX03-12357-1 4.7µH, 5.5A Ferrite Coilcraft DO3316-472 10µH, 3A Ferrite Sumida CDRH125 33µH, 2.2A Ferrite Dale LPE6562-330MB 47µH, 1.2A Ferrite or Kool-Mu Sumida CD75-470 L1 Inductor 3 x 0.02 Ω IRC LR2010-01-R020 (3 in parallel) 0.015 Ω IRC LR2010-01-015 0.025 Ω IRC LR2010-01-R025 0.039 Ω IRC LR2010-01-R039 0.062 Ω IRC LR2010-01-R062 R1 Resistor 1N5820 NIEC NSQ03A02, or Motorola MBRS340T3 1N5821 NIEC NSQ03A04 or Motorola MBRS340T3 1N5819 NIEC EC10QS03 or Motorola MBRS130T3 1N5817 NIEC EC10QS02L or Motorola MBRS130T3 1N5817 Motorola MBR0502L SOD-89 D1 Rectifier 4 x 220µF, 10V Sanyo OS-CON 10SA220M 3 x 220µF, 10V AVX TPS or Sprague 595D 220µF, 10V AVX TPS or Sprague 595D 150µF, 10V AVX TPS or Sprague 595D 150µF, 10V AVX TPS or Sprague 595D C2 Output Capacitor 2 x 220µF, 10V Sanyo OS-CON 10SA220M 4 x 22µF, 35V AVX TPS or Sprague 595D 2 x 22µF, 35V AVX TPS or Sprague 595D 2 x 22µF, 35V AVX TPS or Sprague 595D 22µF, 35V AVX TPS or Sprague 595D C1 Input Capacitor Motorola MTD75N03HDL D2PAK Motorola MTD20N03HDL DPAK Motorola MMSF5N03HD or Si9410 Motorola 1/2 MMDF3N03HD or 1/2 Si9936 International Rectifier 1/2 IRF7101 Q2 Low-Side MOSFET Motorola MTD75N03HDL D2PAK Motorola MTD20N03HDL DPAK Motorola MMSF5N03HD or Si9410 Motorola 1/2 MMDF3N03HD or 1/2 Si9936 International Rectifier 1/2 IRF7101 Q1 High-Side MOSFET 4.5V to 6V 4.75V to 24V 4.75V to 28V 4.75V to 18V 4.75V to 18V Input Range {1} 847-390-4405 (847) 390-4461 TDK [81] 3-3607-5144 (847) 956-0666 Sumida [1] 603-224-1430 (603) 224-1961 Sprague [1] 408-970-3950 (408) 988-8000 (800) 554-5565 Siliconix [81] 7-2070-1174 (619) 661-6835 Sanyo [81] 3-3494-7414 (805) 867-2555* NIEC [1] 814-238-0490 (814) 237-1431 (800) 831-9172 Murata-Erie FACTORY FAX [Country Code] USA PHONE MANUFACTURER [1] 702-831-3521 (702) 831-0140 Transpower Technologies [1] 602-994-6430 (602) 303-5454 Motorola LOAD CURRENT 10A 4A 3A 2A 1A COMPONENT 300kHz 300kHz 300kHz 300kHz 150kHz Frequency Desktop 5V-to-3V High-End Notebook Notebook Sub-Notebook PDA Application |
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