製品概要
概要
PM6685 is a dual step-down controller specifically designed to provide extremely high efficiency conversion with loss-less 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. The pulse skipping technique increases efficiency for very light loads. Moreover, a minimum switching frequency of 33kHz is selectable in order to avoid audio noise issues.
The PM6685 provides a selectable switching frequency, allowing either 200 kHz/300 kHz, 300 kHz/400 kHz, or 400 kHz/500 kHz operation of the 5 V/3.3 V switching sections.
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特徴
- 6 V to 28 V input voltage range
- Fixed 5 V - 3.3 V output voltages
- 5 V and 3.3 V voltage always available to deliver 100 mA of peak current
- 1.230 V ±1% reference voltage available
- Lossless current sensing using low side
- MOSFETs' RDS(on)
- Negative current limit
- Soft-start internally fixed at 2 ms
- Soft output discharge
- Latched OVP and UVP
- Selectable pulse skipping at light loads
- Selectable minimum frequency (33 kHz) in pulse skip mode
- 4 mW maximum quiescent power
- Independent power good signals
- Output voltage ripple compensation
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STマイクロエレクトロニクス - PM6685
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