概览
优势和特点
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产品详情
The ADP2503/ADP2504 are high efficiency, low quiescent current step-up/step-down dc-to-dc converters that can operate at input voltages greater than, less than, or equal to the regulated output voltage. The power switches and synchronous rectifiers are internal to minimize external part count. At high load currents, the ADP2503/ADP2504 use a current-mode, fixed frequency pulse-width modulation (PWM) control scheme for optimal stability and transient response. To ensure the longest battery life in portable applications, the ADP2503/ADP2504 have an optional power save mode that reduces the switching frequency under light load conditions. For wireless and other low noise applications where variable frequency power save mode may cause interference, the logic control input sync forces fixed frequency PWM operation under all load conditions.The ADP2503/ADP2504 can run from input voltages between 2.3 V and 5.5 V, allowing single lithium or lithium polymer cell, multiple alkaline or NiMH cells, PCMCIA, USB, and other standard power sources. The ADP2503/ADP2504 have fixed output options, or using the adjustable model, the output voltage can be programmed through an external resistor divider. Compensation is internal to minimize the number of external components.
During logic-controlled shutdown, the input is disconnected from the output and draws less than 1 μA from the input source. Operating as boost converters, the ADP2503/ADP2504 feature a true load disconnect function that isolates the load from the power source. Other key features include undervoltage lockout to prevent deep battery discharge, and soft start to prevent input current overshoot at startup.
Applications
Data Sheet, Rev. A, 08/09
产品生命周期
量产
该产品系列中至少有一个型号已量产并可供采购。该产品适合用于新设计，但也可能有更新的替代产品。
评估套件 (1)
文档
工具及仿真模型
LTspice
LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.
Models for the following parts are available in LTspice:
设计工具
Microsoft Excel download tool from ADIsimPower to generate a power supply design complete with a schematic, bill of materials, and performance specifications.
这款专家级设计工具只需一分钟左右的时间就能产生定制的DC/DC转换器设计。用户提供5个输入，并选择优化目标：效率、PCB空间、成本或器件数量。输出为完整的原理图、材料清单(BOM)、效率图和性能摘要。这款工具为每个设计提供一份PDF概述文档和一个空白PCB，以帮助用户快速完成原型制作，验证设计目标。
参考电路 (1)
参考资料
参考电路 (1)
ADP2503:600 mA，2.5 MHz降压-升压式DC-DC转换器
技术文章 (1)
设计资源
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PCN-PDN信息
讨论
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