MAX756 Maxim Integrated Products, MAX756 Datasheet
MAX756
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MAX756 Summary of contents
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... Description The MAX756/MAX757 are CMOS step-up DC-DC switch- ing regulators for small, low input voltage or battery-pow- ered systems. 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 ...
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... Storage Temperature Range............................... -65°to +160°C Lead Temperature (soldering, 10sec) ........................... +300°C = 2.5V 0mA LOAD A MIN CONDITIONS MAX756, 3/5 = 0V, 0mA < I < 200mA LOAD < 3V MAX756, 3/5 = 3V, 0mA < I < 300mA IN LOAD MAX757 5V, 0mA < I < 200mA OUT LOAD = 3.47V, OUT = 3.47V, OUT = 0.1µF REF = 0.22µ ...
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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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... Low-Battery Input. When the voltage on LBI drops below +1.25V, LBO sinks current LBI Connect to V Connect OUT to the regulator output. It provides bootstrapped power to both devices OUT and also senses the output voltage for the MAX756 GND Power Ground. Must be low impedance; solder directly to ground plane 1A, 0.5Ω N-Channel Power MOSFET Drain ...
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... Do not leave the control inputs floating. __________________Design Procedure Output Voltage Selection The MAX756 output voltage can be selected to 3. under logic control can be left in one mode or the other by tying 3/5 to GND or OUT. Efficiency varies depending upon the battery and the load, and is typi- cally better than 80% over a 2mA to 200mA load range ...
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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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... MAXIMUM ON-TIME TRIG ONE-SHOT ONE-SHOT LBO LBI Figure 2. MAX756 Block Diagram _______________________________________________________________________________________ 3.3V/5V/Adjustable-Output, Step-Up DC-DC Converters For optimum performance, a switching Schottky diode, such as the 1N5817, is recommended. 1N5817 equiv- alent diodes are also available in surface-mount pack- ages from Collmer Semiconductor in Dallas, TX, phone (214) 233-1589 ...
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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 ...