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MAX606ESA Datasheet(PDF) 8 Page - Maxim Integrated Products |
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MAX606ESA Datasheet(HTML) 8 Page - Maxim Integrated Products |
8 / 12 page Low-Profile, 5V/12V or Adjustable, Step-Up DC-DC Converters for Flash Memory/PCMCIA Cards 8 _______________________________________________________________________________________ Detailed Description The remainder of this document contains the detailed information you’ll need to design a circuit that differs from the two Standard Application Circuits. If you are using one of the predesigned circuits, the following sections are purely informational. The MAX606/MAX607 CMOS, step-up DC-DC convert- ers employ a current-limited pulse-frequency control scheme. This control scheme regulates a boost topolo- gy to convert input voltages between 3V and 5.5V into either a pin-programmable 5V/12V output, or an adjustable output between VIN and 12.5V. It optimizes performance over all input and output voltages, and guarantees output accuracy to ±4%. The ultra-high switching frequency (typically 1MHz for the MAX606 and 0.5MHz for the MAX607) permits the use of extremely small external components, making these converters ideal for use in Types 1, 2, and 3 flash memory and PCMCIA applications. Pulse-Frequency-Modulation Control Scheme The MAX606/MAX607 employ a proprietary, current- limited control scheme that combines the ultra-low sup- ply current of traditional pulse-skipping converters with the high full-load efficiency of current-mode pulse- width-modulation converters. This particular control scheme is similar to the one used in previous current- limited devices (which governed the switching current via maximum on-time, minimum off-time, and current limit), except it varies the on and off times according to the input and output voltages. This important feature enables the MAX606/MAX607 to achieve ultra-high switching frequencies while maintaining high output accuracy, low output ripple, and high efficiency over a wide range of loads and input/output voltages. Figure 3 shows the functional diagram of the MAX606/ MAX607. The internal power MOSFET is turned on when the error comparator senses that the output is out of reg- ulation. The power switch stays on until either the timing circuit turns it off at the end of the on-time, or the switch current reaches the current limit. Once off, the switch remains off during the off-time. Subsequently, if the out- put is still out of regulation, another switching cycle is ini- tiated. Otherwise, the switch remains turned off as long as the output is in regulation. Table 1. Suggested Components for 12V Standard Application Circuit of Figure 2 Table 2. Suggested Components for 5V Standard Application Circuit of Figure 1 DESIGNATION MAX606 MAX607 L1 5µH inductor Dale ILS-3825-XX 10µH inductor Sumida CLS62-100 D1 0.5A, 20V diode Motorola MBR0520L 0.5A, 20V diode Motorola MBR0520L C1 0.1µF ceramic cap. 0.1µF ceramic cap. C2 2 x 0.68µF ceramic cap. Marcon THCR20E1E684Z 2.2µF ceramic cap. Marcon THCR30E1E225M C3 2 x 0.68µF ceramic cap. Marcon THCR20E1E684Z 2 x 1µF ceramic cap. Marcon THCR30E1E105M C4 10nF ceramic cap. 10nF ceramic cap. SUPPLIER PHONE FAX Dale Inductors 605-668-4131 605-665-1627 Marcon/United Chemi-Con 708-696-2000 708-518-9985 Sumida USA 708-956-0666 708-956-0702 Sumida Japan 03-607-5111 03-607-5144 Table 3. Component Suppliers DESIGNATION MAX606 MAX607 L1 5µH, 1A inductor Dale ILS-3825-XX 10µH, 0.7A inductor Sumida CLS62B-100 D1 0.5A, 20V diode Motorola MBR0520L 0.5A, 20V diode Motorola MBR0520L C1 0.1µF ceramic cap. 0.1µF ceramic cap. C2 2 x 0.68µF ceramic cap. Marcon THCR20E1E684Z 2.2µF ceramic cap. Marcon THCR30E1E225M C3 4.7µF ceramic cap. Marcon THCR30E1E475M 4.7µF ceramic cap. Marcon THCR30E1E475M C4 10nF ceramic cap. 10nF ceramic cap. Motorola 602-244-3576 602-244-4015 |
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