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MAX799ESE Datasheet(PDF) 10 Page - Maxim Integrated Products |
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MAX799ESE Datasheet(HTML) 10 Page - Maxim Integrated Products |
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10 / 32 page  Step-Down Controllers with Synchronous Rectifier for CPU Power 10 ______________________________________________________________________________________ ______Standard Application Circuit It is easy to adapt the basic MAX797 single-output 3.3V buck converter (Figure 1) to meet a wide range of applications with inputs up to 28V (limited by choice of external MOSFET). Simply substitute the appropriate components from Table 1. These circuits represent a good set of tradeoffs between cost, size, and efficiency while staying within the worst-case specification limits for stress-related parameters such as capacitor ripple current. Each of these circuits is rated for a continuous load current at TA = +85°C, as shown. The 1A, 2A and 10A applications can withstand a continuous output short-circuit to ground. The 3A and 5A applications can withstand a short circuit of many seconds duration, but the synchronous-rectifier MOSFET overheats, exceed- ing the manufacturer’s ratings for junction temperature by 50°C or more. If the 3A or 5A circuit must be guaranteed to withstand a continuous output short circuit indefinitely, see the section MOSFET Switches under Selecting Other Components. Don’t change the frequency of these cir- cuits without first recalculating component values (par- ticularly inductance value at maximum battery voltage). _______________Detailed Description The MAX796 is a BiCMOS, switch-mode power-supply controller designed primarily for buck-topology regula- tors in battery-powered applications where high effi- ciency and low quiescent supply current are critical. The MAX796 also works well in other topologies such as boost, inverting, and CLK due to the flexibility of its floating high-speed gate driver. Light-load efficiency is enhanced by automatic idle-mode operation—a vari- able-frequency pulse-skipping mode that reduces MAX797 CSL CSH VL SYNC FB V+ 10 11 5 7 14 Q1 Q2 16 15 13 D2 CMPSH-3 J1 150kHz/300kHz JUMPER NOTE: KEEP CURRENT-SENSE LINES SHORT AND CLOSE TOGETHER. SEE FIG. 10 D1 12 8 9 REF 3 GND 4 +5V AT 5mA +3.3V OUTPUT GND OUT BST DH LX DL 2 1 LOW-NOISE CONTROL PGND SKIP SS 6 ON/OFF CONTROL SHDN INPUT REF OUTPUT +2.505V AT 100 µA C5 0.33 µF C4 4.7 µF C7 0.1 µF C6 0.01 µF (OPTIONAL) C1 C2 C3 0.1 µF R1 L1 Figure 1. Standard 3.3V Application Circuit |
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