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MAX606 Datasheet(PDF) 9 Page - Maxim Integrated Products |
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MAX606 Datasheet(HTML) 9 Page - Maxim Integrated Products |
9 / 12 page Low-Profile, 5V/12V or Adjustable, Step-Up DC-DC Converters for Flash Memory/PCMCIA Cards _______________________________________________________________________________________ 9 The on/off times are determined by the input and output voltages: tON = K / VIN tOFF = 0.5 · K / (VOUT + VDIODE - VIN) K is typically 3µs-V for the MAX606 and 6µs-V for the MAX607. This factor is chosen to set the optimum switching frequency and the one-cycle current limit, which determines the no-load output ripple at low out- put-to-input voltage differentials. The factor of 0.5 in the off-time equation is the typical switch off-time ratio. This ratio guarantees high efficiency under a heavy load by allowing the inductor to operate in continuous-conduc- tion mode. For example, a switch off-time ratio of 1 would cause the device to operate on the edge of dis- continuous-conduction mode. To determine the actual switch off-time ratio for a par- ticular device, measure tON, tOFF, VIN, and VOUT, and then solve for the ratio by substituting these values into the off-time equation. Unlike PWM converters, the MAX606/MAX607 generate variable-frequency switching noise. However, the amplitude of this noise does not exceed the product of the switch current limit and the output capacitor equiva- lent series resistance (ESR). Traditional clocked-PFM or pulse-skipping converters cannot make this claim. Output Voltage Selection The MAX606/MAX607 output voltage is pin-program- mable to 5V and 12V, and also adjustable to voltages between VIN and 12.5V. Connect FB to IN for a 5V out- put, to GND for a 12V output, or to a resistive divider between the output and GND for an adjustable output. Always connect OUT to the output. UNDER- VOLTAGE LOCKOUT DUAL MODE REF CURRENT-LIMIT COMPARATOR ERROR COMPARATOR TIMING CIRCUIT tON tOFF CONTROL LOGIC EN ON INH OFF SHDN FB INT/EXT FB 5V/12V OUT SS PGND INTERNAL POWER 1 Ω SWITCH LX IN VREF DRIVER RLIM MAX606 MAX607 Figure 3. Functional Diagram |
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Similar Description - MAX606 |
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