L6983

38V、3A同步降压转换器，静态电流为17μA; • 3.5 V至38 V 工作输入电压 \n• 输出电压从0.85 V到VIN \n• 3.3 V和5 V固定输出电压版本 \n• 3 A DC输出电流 \n• 工作静态电流为17 μA \n• 内部补偿网络 \n• 两种不同的版本：LCM确保低负载时的高效率，而LNM 适用于噪声敏感型应用。 \n• 2 μA关断电流 \n• 内部软启动• 使能 \n• 过电压保护 \n• 输出电压序时序 \n• 过温保护 \n• 开关频率从200 kHz至2.3 MHz可调使用低ESR电容时仍可稳定工作 \n• 以可选扩展频谱改善EMC \n• 电源正常信号 \n• LNM版本可与外部时钟同步 \n• QFN16封装;

L6983是一种易于使用的同步单片降压调节器，能够向负载提供高达3 A的电流。宽的输入电压范围使该器件适用于广泛的应用领域。L6983基于峰值电流模式架构，采用QFN16 3x3封装，带内部补偿功能，从而使设计复杂性和尺寸降至最低。\n\n L6983有低功耗模式（LCM）和低噪声模式（LNM）两个版本。LCM最大限度提高了轻负载时的效率，且输出电压纹波可控，因此该器件适用于电池供电的应用。LNM使开关频率保持恒定，并在轻负载工作时将输出电压纹波降至最低，满足低噪声敏感型应用的要求。L6983允许在200 KHz - 2.2 MHz范围内选择开关频率，并以可选扩展频谱改善EMC。\n\n EN引脚提供启动/关闭功能。禁用之后，典型的关断电流是2 µA。一旦置高EN引脚，器件就被启动，会有1.3 ms内部软启动。L6983的“PGOOD”采用集电极开路输出，用于监测FB电压。两个功率元件上的逐波电流检测实现了有效的恒定电流保护和热关断，防止温升失控。\n\n

L6983

38 V, 3 A synchronous step-down converter with 17 關A quiescent current

L6983I

38 V, 10 W synchronous iso-buck converter for isolated applications

Features Designedforiso-bucktopology 3.5Vto38Voperatinginputvoltage Primaryoutputvoltageregulation/nooptocouplerrequired 4.5Asource/sinkpeakprimarycurrentcapability PeakcurrentmodearchitectureinforcedPWMoperation 390nsblankingtime 200kHzto1MHzprogramm

L6983I

38 V, 10 W synchronous iso-buck converter for isolated applications; • Designed for iso-buck topology \n• 3.5 V to 38 V operating input voltage \n• Primary output voltage regulation / no optocoupler required \n• 4.5 A source / sink peak primary current capability \n• Peak current mode architecture in forced PWM operation \n• 390 ns blanking time \n• 200 kHz to 1 MHz programmable switching frequency. Stable with low ESR capacitor: min 2 µF \n• Internal compensation network \n• 2 μA shutdown current• Internal soft-start \n• Enable \n• Overvoltage protection \n• Output voltage sequencing \n• Thermal protection \n• Optional spread spectrum for improved EMC \n• Power Good \n• Synchronization to external clock \n• QFN16 (3x3 mm) package;

The L6983I is a device specifically designed for isolated buck topology. The primary output voltage can be accurately adjusted, whereas the isolated secondary output is derived by using a given transformer ratio. No optocoupler is required. The primary sink capability up to -4.5 A (even during soft-start) allows a proper energy transfer to the secondary side as well as enabling a tracked soft-start of the secondary output. The control loop is based on a peak current mode architecture and the device operates in forced PWM. The 390 ns blanking time filters oscillations, generated by the transformer leakage inductance, making the solution more robust.\n\n The compact QFN16 3x3 mm package and the internal compensation of the L6983I help minimize design complexity and size.\n\n The switching frequency can be programmed in the 200 kHz - 1 MHz range with optional spread spectrum for improved EMC. The EN pin provides enable/disable functionality.\n\n The typical shutdown current is 2 μA when disabled. As soon as the EN pin is pulled up the device is enabled and the internal 1.3 ms soft-start takes place. The L6983I features Power Good open collector that monitors the FB voltage. Pulse by pulse current sensing on both power elements implements an effective constant current protection and thermal shutdown prevents thermal run-away.\n\n

L6983IQTR

38 V, 10 W synchronous iso-buck converter for isolated applications

Features Designedforiso-bucktopology 3.5Vto38Voperatinginputvoltage Primaryoutputvoltageregulation/nooptocouplerrequired 4.5Asource/sinkpeakprimarycurrentcapability PeakcurrentmodearchitectureinforcedPWMoperation 390nsblankingtime 200kHzto1MHzprogramm

L6983NQTR

38 V, 10 W synchronous iso-buck converter for isolated applications

Features Designedforiso-bucktopology 3.5Vto38Voperatinginputvoltage Primaryoutputvoltageregulation/nooptocouplerrequired 4.5Asource/sinkpeakprimarycurrentcapability PeakcurrentmodearchitectureinforcedPWMoperation 390nsblankingtime 200kHzto1MHzprogramm

L6983_V01

38 V, 3 A synchronous step-down converter with 17 關A quiescent current

L6983C33QTR

38 V, 3 A synchronous step-down converter with 17 關A quiescent current

L6983C33QTR

38 V, 3 A synchronous step-down converter with 17 關A quiescent current

L6983C50QTR

38 V, 3 A synchronous step-down converter with 17 關A quiescent current