产品概述
描述
The PM6675S device consists of a single high efficiency step-down controller and an independent Low Drop-Out (LDO) linear regulator.
The Constant On-Time (COT) architecture assures fast transient response supporting both electrolytic and ceramic output capacitors. An embedded integrator control loop compensates the DC voltage error due to the output ripple.
A selectable low-consumption mode allows the highest efficiency over a wide range of load conditions. The low-noise mode sets the minimum switching frequency to 33 kHz for audio-sensitive applications.
The LDO linear regulator can sink and source up to 2 Apk. Two fixed current limits (±1 A-±2 A) can be chosen.
An active soft-end is independently performed on both the switching and the linear regulators outputs when disabled.
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所有功能
- Switching section
4.5 V to 28 V input voltage range 0.6 V, ±1 % voltage reference Selectable 1.5 V fixed output voltage Adjustable 0.6 V to 3.3 V output voltage 1.237 V ±1 % reference voltage available Very fast load transient response using constant on-time control loop No RSENSE current sensing using low side MOSFETs' RDS(ON) Negative current limit Latched OVP and UVP Soft-start internally fixed at 3 ms Selectable pulse skipping at light load Selectable No-Audible (33 kHz) pulse skip mode Ceramic output capacitors supported Output voltage ripple compensation Output soft-end - LDO regulator section
Adjustable 0.6 V to 3.3 V output voltage Selectable ±1 Apk or ±2 Apk current limit Dedicated power-good signal Ceramic output capacitors supported Output soft-end
- Switching section
