Demonstration Board for 60V, 3A, 2MHz Step-Down Switching Regulator with 2.7μA Quiescent Current
The is a demonstration board featuring LT3995 switching regulator. The LT3995 is a compact, high efficiency monolithic step down switching regulator that consumes only 2.7µA of quiescent current. The demonstration board is designed for 3.3V, 3A output from a 4.3V to 60V input. The switching frequency can be programmed either via oscillator resistor or external clock up to 2MHz. To synchronize to an external clock, move JP2 to SYNC and apply the external clock to the SYNC turret. The RT resistor R5 should be chosen to set the LT3995 internal switching frequency at least 20% below the lowest synchronization input frequency. Low ripple burst mode operation increases the efficiency at the light load while keeping the output ripple below 15mV. The SYNC pin on the demo board is grounded by default by setting JP2 at RT FREQ for low ripple burst mode operation.
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- Switching frequency of 300KHz ± 20%
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- 82.2% efficiency
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- Excellent start up and dropout performance
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- Accurate programmable undervoltage lockout
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- Low shutdown current IQ of 700nA
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- Power good flag
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- Soft start capability
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- Thermal shutdown protection
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- Current limit foldback with SS override
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- Saturating switch design, 85mohm on resistance
If there is no output, temporarily disconnect the load to make sure that the load is not set too high or is shorted.