PM6686 Dual step-down controller with adjustable voltages, adjustable LDO and auxiliary charge pump controller for notebook

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

技术特性

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

应用原理图

PM6686 订购信息

订购型号	产品状态	美金价格	数量	封装	包装形式	温度范围	材料声明
PM6686TR	Active		1000	VFQFPN 32 5x5x1.0	Tape And Reel
PM6686	Active		1000	VFQFPN 32 5x5x1.0	Tube

DATASHEET

描述	版本	大小
PM6686 : Dual step-down controller with adjustable voltages, adjustable LDO and auxiliary charge pump controller for notebook	4	1067KB