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| ADP2387同步降压DC电源稳压器解决方案 |
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| 文章来源： 更新时间：2016/3/24 10:45:00 |
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ADI公司的ADP2387是集成了44 mΩ高边功率MOSFET和11 mΩ同步整流器MOSFET的同步降压DC电源稳压器,在4 mm×4 mm LFCSP封装中提供完整高效的解决方案,输入电压4.5V-20V,连续输出电流6A,基准电压0.6 V ± 1%,主要用在通信基础设备,网络和服务器,工业和仪表,医疗保健以及DC/DC点负载.本文介绍了ADP2387主要特性,功能框图和多种应用电路,以及ADP2387-EVALZ评估板优势和特点,电路图,材料清单和PCB设计图.
The ADP2387 is a synchronous step-down, dc-to-dc regulator with an integrated 44 mΩ, high-side power, metal oxide semiconductor field effect transistor (MOSFET) and an 11 mΩ, synchronous rectifier MOSFET to provide a high efficiency solution in a compact 4 mm × 4 mm LFCSP. This device uses a peak current mode, constant frequency pulse-width modulation (PWM) control scheme for excellent stability and transient response. The switching frequency of the ADP2387 can be programmed between 200 kHz to 1400 kHz. The ADP2387 requires minimal external components and operates from an input voltage of 4.5 V to 20 V. The output voltage can be adjusted from 0.6 V to 90% of the input voltage and delivers up to 6 A of continuous current. Each IC draws less than 110 μA current from the input source when it is disabled. This regulator targets high performance applications that require high efficiency and design flexibility. External compensation and an adjustable soft start function provide design flexibility. The power-good output and precision enable input provide simple and reliable power sequencing. The programmable current-limit function allows the inductor to be optimized by output current.
Other key features include undervoltage lockout (UVLO), overvoltage protection (OVP), overcurrent protection (OCP), short-circuit protection (SCP), and thermal shutdown (TSD). The ADP2387 operates over the −40℃ to +125℃ junction temperature range and is available in a 24-lead, 4 mm × 4 mm LFCSP.
ADP2387主要特性:
Input voltage range: 4.5 V to 20 V
Integrated MOSFET: 44 mΩ typical/11 mΩ typical
Reference voltage: 0.6 V ± 1%
Continuous output current: 6 A
Programmable current-limit threshold
Programmable switching frequency: 200 kHz to 1400 kHz
Precision enable and power good
External compensation Internal soft start with external adjustable option
tartup into a precharged output
Supported by ADIsimPower design tool
ADP2387应用:
Communications infrastructure
Networking and servers
Industrial and instrumentation
Healthcare and medical
Intermediate power rail conversion
DC-to-dc point of load applications
图1.ADP2387功能框图
图2.ADP2387典型应用电路:VIN = 12 V, VOUT = 1.2 V, IOUT = 6 A, fSW = 500 kHz
图3.ADP2387可编输入电压UVLO,上升阈11V,下降阈值10V的应用电路:VIN = 12 V, VOUT = 5 V, IOUT = 6 A, fSW = 600 kHz
图4.ADP2387可编峰值限流阈值5A:VIN = 12 V, VOUT = 3.3 V, IOUT = 3 A, fSW = 600 kHz
ADP2387-EVALZ评估板
ADP2387-EVALZ评估板是完整的6 A、20 V降压稳压器解决方案，用户可采用近乎理想的印刷电路板(PCB)布局来评估ADP2387的性能。
通过可编程限流功能，输出电流可对电感进行优化。峰值限流阈值预设为9 A以确保6 A输出电流能力。开关频率可在200 kHz至1.4 MHz范围内进行编程，从而实现可堆叠多相功率解决方案。
ADP2387-EVALZ评估板输出预设为3.3 V，且开关频率设置为600 kHz。不同的输出电压设置可以通过选用合适的无源器件来实现。环境工作温度范围为−40℃至+85℃。
ADP2387-EVALZ评估板优势和特点:
输入电压： 4.5 V至20 V
输出电压精度：±1%
集成MOSFET： 44 mΩ（典型值）/11 mΩ（典型值）
连续输出电流： 6 A
可编程限流阈值
可编程开关频率： 200 kHz至1.4 MHz
精密使能和电源良好指示
外部补偿
提供外部可调选项的内部软启动
启动后进入预充电输出
图5.ADP2387-EVALZ评估板外形图
图6.ADP2387-EVALZ评估板电路图
ADP2387-EVALZ评估板材料清单:
图7.ADP2387-EVALZ评估板PCB设计图(1)
图8.ADP2387-EVALZ评估板PCB设计图(2) |
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