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PM6680A is a dual step-down controller specifically designed to provide extremely high efficiency conversion, with losses current sensing technique. The constant on-time architecture assures fast load transient response and the embedded voltage feed-forward provides nearly constant switching frequency operation. An embedded integrator control loop compensates the DC voltage error due to the output ripple. Pulse skipping technique increases efficiency at very light load. Moreover a minimum switching frequency of 33kHz is selectable to avoid audio noise issues. The PM6680A provides a selectable switching frequency, allowing three different values of switching frequencies for the two operation of the two switching sections. The output voltages OUT1 and OUT2 can be adjusted from 0.9V to 5V and from 0.9V to 3.3V respectively.
主要特性
- Selectable pulse skipping at light loads
- Latched OVP and UVP
- 5mW maximum quiescent power
- Selectable minimum frequency (33kHz) in pulse skip mode
- Output voltage ripple compensation
- Independent power good signals
- Thermal shutdown
- Soft-start internally fixed at 2ms
- Valley current sensing
- 6V to 36V input voltage range
- 5V LDO delivers 100mA peak current
- Adjustable output voltages
- Current sensing using low side MOSFETs RDS(on)
- Soft output discharge
- 1.237V ±1% reference voltage available externally
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