PM6686数据手册集成电路（IC）的特殊用途稳压器规格书PDF

描述 Description

PM6686 is a dual step-down controller specifically designed to provide extremely high efficiency conversion, with lossless 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. Pulse skipping technique increases efficiency at very light load. Moreover a minimum switching frequency of 33 kHz is selectable to avoid audio noise issues. The PM6686 provides a selectable switching frequency, allowing three different values of switching frequencies for the two switching sections. The output voltages OUT1 and OUT2 can be programmed to regulate 1.5 V/5 V and 1.05 V/3.3 V outputs respectively or can deliver two adjustable output voltages. An optional external charge pump can be monitored.

This device embeds a linear regulator that can provide 3.3 V/5 V or an adjustable voltage from 0.7 V to 4.5 V output. The linear regulator provides up to 100 mA output current. LDO can be bypassed with the switching regulator outputs or with an external power supply (switchover function).

When in switchover, the LDO output can source up to 200 mA.

特性 Features

• Latched OVP and UVP
• Independent Power Good and EN signals
• Fixed 3.3 V/5.0 V, or adjustable output 0.7 V to 4.5 V, ± 1.5% (LDO): 200 mA
• Charge pump feedback
• 2.0 V reference voltage ± 1.0%: 50 μA
• 3.3 V reference voltage ± 2.0%: 5 mA
• Selectable pulse skipping at light loads
• Soft-start internally fixed at 2 ms and soft-stop
• 5.5 V to 28 V input voltage range
• Low-side MOSFETs' RDS(on) current sensing and programmable current limit
• Dual fixed OUT1 = 1.5 V/5 V and OUT2 = 1.05 V / 3.3 V outputs or adjustable OUT1 = 0.7 V to 5.5 V and OUT2 = 0.7 V to 2.5 V outputs, ± 1.5% accuracy over valley regulation
• Frequency selectable
• Selectable minimum frequency (33 kHz) in pulse skip mode
• Constant ON-time control

简介

PM6686属于集成电路（IC）的特殊用途稳压器。由制造生产的PM6686特殊用途稳压器该系列产品用于电源控制、某种形式的转换，适用于特定的复杂应用。因此，各种产品特性集差异较大，包括空燃比传感器接口、汽车交流发电机电压调节、DDR 端接、液体透镜控制、摩托车转向信号控制、热电 (peltier) 冷却器控制、压电触觉控制、阀门控制、小型发动机管理等。