【产品】输出电流高达3A的LDO,可为太空应用提供优秀抗辐射性能
ISL75051ASEH和ISL73051ASEH是RENESAS子公司intersil推出的连续输出电流高达3.0A的抗辐射、低电压、单输出低压差线性稳压器(LDO)。这些器件在2.2V至6.0V的输入电压范围内工作,并可根据电阻分压器的设置来提供0.8V至5.0V的可调输出电压;此外,使用该器件可实现低至65mV的压差电压。
该款LDO通过OCP引脚动态修改短路输出电流限制功能的阈值,通过从OCP引脚到GND引脚的一个电阻来编程设置。过流保护(OCP)的阈值范围最小为0.5A,最大为8.5A。电阻将在故障条件下为输出设置一个恒定电流阈值。如果器件温度超过规定值,热关断功能会禁用输出。随后进入开/关循环模式,直到故障消除。ENABLE功能允许器件进入低电流关断模式,电流典型值为10μA。
ISL75051ASEH和ISL73051ASEH针对快速瞬态响应和单一事件效应(SEE)进行了优化。上述优化降低了在输出上出现的单一事件瞬态(SET)的幅度,从而不需要额外的保护二极管和滤波器。这两款线性稳压器在钽电容低至47μF的情况下稳定可靠,并提供从空载到满载的完美调节。可编程软启动功能允许用户通过调节BYP引脚上的去耦电容值来编程修改浪涌电流。
图1 ISL75051ASEH和ISL73051ASEH典型应用框图
ISL75051ASEH和ISL73051ASEH产品特性:
·符合DLA SMD 5962-11212标准
·在TJ=+150°C时,输出电流高达3.0A
·输出精度在MIL温度范围内为±1.5%
·超低压差:
在1.0A时,压差电压为65mV(典型值);
3.0A下,压差电压为225mV(典型)
·输入电源电压范围:2.2V至6.0V
·快速的负载瞬态响应
·关断电流为10μA(典型值)
·可通过外部电阻器调节输出电压
·1kHz时的PSRR为66dB(典型值)
·具有使能和PGood功能
·可编程软启动/浪涌电流限制功能
·过温关闭和可编程OCP限制功能
·采用最低47μF的钽电容器实现高稳定性
·抗辐射度(仅限ISL75051ASEH)
高剂量率(50-300rad(Si)/s):100krad(Si);
低剂量率(≤0.01rad(Si)/s):50krad(Si)
·抗辐射度(仅限ISL73051ASEH)
低剂量率(≤0.01rad(Si)/s):50krad(Si)
ISL75051ASEH和ISL73051ASEH应用领域:
·用于太空应用的LDO稳压器
·DSP,FPGA和μP核心电源
·开关模式电源的后期调节
·井下钻探
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本文由Tigerhoho翻译自Renesas,版权归世强硬创平台所有,非经授权,任何媒体、网站或个人不得转载,授权转载时须注明“来源:世强硬创平台”。
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