SP7656 EXAR [Exar Corporation], SP7656 Datasheet
SP7656
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SP7656 Summary of contents
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... Lead Free, RoHS Compliant Package DESCRIPTION The SP7656 is a PWM controlled step down (buck) voltage mode regulator co-packaged with a P- Channel FET. It operates from 4.5V to 29V making it suitable for 5V, 12V and 24V applications. The programmable overcurrent protection is based on internal FET resistance sensing and allows setting the overcurrent protection value 300mV threshold (measured between VIN-LX) ...
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... P-Channel FET ON Resistance P-Channel FET Source leakage 11/07/08 SP7656 PowerBlox FB……………..................................................-0.3V to 5.5V Storage Temperature..…….……………..…-65 C to 150 C Junction Temperature..................................-40C to 125C Lead Temperature (Soldering, 10 sec)......…………..300 C = 4.7 ...
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... LX through an optional resistor. Internal threshold is pre-set to 300mV nominal and 8 ISET can be decreased by changing the external resistor based on the following formula: V TRSHLD 5V VREF FAULT FB FAULT + 1V - 11/07/08 SP7656 PowerBlox DESCRIPTION = 300mV – 30uA * R. Where R≤3kΩ Oscillator VIN VIN + + - - PWM Comparator Error Amplifier FAULT UVLO ...
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... P-Channel FET. SP7656 is optimized for minimum component, small form factor and cost effectiveness. It has been designed for single-supply operation ranging from 4.5V to 29V. SP7656 has Type-2 internal compensation for Electrolytic/Tantalum output capacitors. For ceramic capacitors Type-3 compensation can be implemented by simply adding an R and C between output and Feedback ...
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... R 2 0.6 is used the reference voltage of the SP7656. 200k is a fixed-value and is the top resistor in the output set point resistor pair. In addition to being part of the voltage divider part of the compensation network the output voltage divider should always be ...
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... V is steady state output voltage OUT Output voltage undershoot calculation is more complicated. Test results for SP7656 buck circuits show that undershoot is approximately equal to overshoot. Therefore above equation 11/07/08 SP7656 PowerBlox provides a satisfactory method for calculating C . Select ESR such that output voltage ...
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... LX node in particular and away from the power supply completely if possible. . RIP Cin 7656 For more detail on the SP7656 layout see the SP7656EVB (Evaluation available on our web site. Each layer is shown in detail as well as a complete bill of materials and performance ...
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... V in= 24V 50 40 0.0 1.0 2 (A) Figure 3- Efficiency, Natural convection at Vout=3.3V, Ta= 25°C LX Output Ripple Inductor Ripple Current 2A/div Figure 5- Output Ripple Vout=3.3V, Ta= 25°C 11/07/08 SP7656 PowerBlox Figure 2- Typical application circuit 100 3.0 4.0 0.0 Figure 4- Efficiency Natural convection at Vout=12V, Ta= 25°C, ...
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... SP7656 PowerBlox PACKAGE: 8-pin HSOICN Copyright 2008 EXAR Corporation 9 ...
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... Temperature Range SP7656EN2-L………………………….- 40°C to 125°C…………………(Lead Free) 8-pin HSOICN SP7656EN2-L/TR……………………..- 40°C to 125°C………………….(Lead Free) 8-pin HSOICN ...