【经验】圣邦微负压输出BUCK-BOOST芯片SGM660设计经验分享

时间： 2023-06-29 来源：世强

技术问答

SGM660是圣邦微的一款负压输出BUCK-BOOST芯片，输入电压2.8-5.5V，输出电压-0.8V to -5.2V，0.1V/Step，开关电流和工作频率都是可编程的，内置峰值电流限制、软起动和欠压保护等功能，提供超小封装WLCSP-0.9×1.3-6B。下图1为SGM660典型应用电路。

图1

SGM660的输出电压、工作频率、限流值、工作模式都是通过SWIRE脚（数字接口）控制，下面介绍在实际设计中如何配置。

（1）若SWIRE脚没有上升沿脉冲，SGM660默认输出为-2.5V,工作频率1.6MHz，限流值0.81A，芯片工作在强制PWM模式；

（2）若需配置输出电压为，工作频率为1.8MHz，轻载PFM模式，查阅图1配置表，给SWIRE脚24个上升沿脉冲，然后经过Tstore 55μs(典型值)后，继续再加50个上升沿脉冲，经过Tstore 55μs(典型值)后，再加56个上升沿脉冲，具体时序可参考图2.

图1 参数配置表

图2 时序图

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光模块电源管理电路中有需要为EML驱动电路供电的负压电路，目前国产有以下两种负压电路方案可供参考。方案一是利用BUCK-BOOST电路来实现，通过电感储能来实现负电压的转换，外围电路设计简单。方案二是采用负电荷泵来实现，通过电容储能来实现负电压的转换，无需使用电感，外围电路简单可靠。

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SGMICRO（圣邦微）信号链和电源管理芯片选型指南

描述- SGMICRO specializes in high-performance and high-quality analog and mixed-signal integrated circuits, and is committed to building a comprehensive portfolio of the highest quality analog and mixed-signal integrated circuits to address all customer needs.

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产品型号	品类	CH	Enable	Vcc (Min)(V)	Vcc (Max)(V)	I_OUT(mA)	Frequency (kHz)	Iq (μA)	SHDN Iq(μA)	Package
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