JTM5178 is a high efficiency synchronous boost regulator th(2)

五,电路原理图

六.产品PDF文档

七,功能概述

SYNCHRONOUS RECTIFIER
The device integrates an N-channel and a P-channel MOSFET transistor to realize a
synchronous rectifier. Because the commonly used discrete Schottky rectifier is replaced with
a low RDS(ON) PMOS switch, the power conversion efficiency reaches 96%. To avoid
ground shift due to the high currents in the NMOS switch, two separate ground pins are used.
The reference for all control functions is the GND pin. The source of the NMOS switch is
connected to PGND. Both grounds must be connected on the PCB at only one point close to
the GND pin. A special circuit is applied to disconnect the load from the input during
shutdown of the converter. In conventional synchronous rectifier circuits, the backgate diode
of the high-side PMOS is forward biased in shutdown and allows current flowing from the
battery to the output. This device however uses a special circuit which takes the cathode of
the backgate diode of the high-side PMOS and disconnects it from the source when the
regulator is not enabled (EN = low).
The benefit of this feature for the system design engineer is that the battery is not depleted
during shutdown of the converter. No additional components have to be added to the design
to make sure that the battery is disconnected from the output of the converter.
八,相关产品

外置MOS/扩流输出 DC-DC 升压IC

型号	工作模式	工作	输出电压	输出电	输出电	外置MOS	效率	静态	工作频率	封装	直接替代型号
		电压范围		压形式	压精度	最大输		电流
						出电流
JTM1533	PWM/PFM	0.9V-6.0V	1.5V-20V	可调输出	±2%	扩流达3A	90%	0.5uA	1MHz	SOT-25	XC9104/5/S8355/6/APW7077
											/EUP2573/SP6355
JTM1532	PWM/PFM	1.8V-6.0V	最大12V	可调输出	±2%	扩流达2A	92%	70uA	1.2MHz	SOT-25	XC9104/5/S8355/6/APW7077
											/EUP2573/SP6355
JTM9266	PWM	1V-10V	最大12V	可调输出	±2%	扩流达1.5A	92%	70uA	450KHz	SOT-26	RT9266/PT1301/AX1301
JTM5306	PWM	2.5V-100V	最大100V	可调输出	±2%	扩流0.5A	90%	220uA	1MHz	SOP-8	TAC2305
JTM3800S/T	PWM	1.8-15V		可调输出	±4%	扩流最大3A		1uA	1MHz	SOP8	MB3800/AT1380
										TSSOP8	APW7078

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