MAX757 Maxim Integrated Products, MAX757 Datasheet
MAX757
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MAX757 Summary of contents
Page 1
... The MAX756 accepts a positive input voltage down to 0.7V and converts higher pin- selectable output voltage of 3.3V or 5V. The MAX757 is an adjustable version that accepts an input voltage down to 0.7V and generates a higher adjustable output voltage in the range from 2 ...
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... I = 20mA LOAD Voltage (once started 0mA, 3/5 = 3V, LBI = 1.25V, V Quiescent Supply Current in LOAD 3.3V Mode (Note 1.3V (MAX757 only) Battery Quiescent Current Output set for 3.3V Measured Figure 1 IN Shutdown Quiescent Current SHDN = 0V, LBI = 1.25V, 3/5 = 3V, V (Note 1.3V (MAX757 only) ...
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Operating Characteristics (Circuit of Figure +25°C, unless otherwise noted.) A EFFICIENCY vs. LOAD CURRENT 3.3V OUTPUT MODE 100 1000 ...
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... V = 2.5V IN HORIZONTAL = 50 s/div 5V Mode ______________________________________________________________Pin Description PIN NAME MAX756 MAX757 Shutdown Input disables SMPS when low, but the voltage reference and low-battery com SHDN parator remain active. 2 – 3/5 Selects the main output voltage setting; 5V when low, 3.3V when high. ...
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... In many systems this is acceptable; however, the output voltage must not be forced above 7V. The output voltage of the MAX757 is set by two resis- tors, R1 and R2 (Figure 1), which form a voltage divider between the output and the FB pin. The output voltage ...
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... The 22µH inductor shown in the typical applications cir- cuit is sufficient for most MAX756/MAX757 application circuits. Higher input voltages increase the energy transferred with each cycle, due to the reduced input/output differential ...
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The ESR of both bypass and filter capacitors affects efficiency. Best performance is obtained by using spe- cialized low-ESR capacitors, or connecting two or more filter capacitors in parallel. The smallest low-ESR SMT tantalum capacitors currently available are Sprague 595D ...
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... All connections to the FB and LX pins should also be kept as short as possible. To obtain maximum output power and efficiency and mini- mum output ripple voltage, use a ground plane and solder the MAX756/MAX757 GND (pin 7) directly to the ground plane. ________________________________________________________Package Information E ...