ADP2109是一款采用超小型5焊球WLCSP封装的高效率、低静态电流的
Step-down DC/DC converters，它具有内置放电开关，可使输出电容自动放电。
The overall solution requires only three small external components. It adopts a patented high-speed current mode and constant frequency PWM control scheme for excellent stability and transient response. ADP2109 comes with a power-saving mode that reduces switching frequency under light loads, ensuring maximum battery life in portable applications.
The ADP2109 has an input voltage range of 2.3 V to 5.5 V and can be powered from a single lithium-ion or lithium-polymer battery, multiple alkaline or nickel-metal hydride batteries, PCMCIA, USB, and other standard power supplies. A maximum load current of 600 mA is achieved over the input voltage range. ADP2109 can provide fixed output voltages of 1.8 V, 1.2 V, and 1.0 V. All versions include a built-in power switch and synchronous rectifier that requires minimal external components and high efficiency. ADP2109 comes with built-in soft start and internal compensation. When shutdown is performed by logic control, the input and output are disconnected ADP2109 draw less than 1 μA of current from the input supply.
Other key features include undervoltage lockout to prevent deep battery discharge and soft start to prevent input current overshoot during start-up. ADP2109 is available in a 5-bump WLCSP package.
Other key features include undervoltage lockout to prevent deep battery discharge and soft start to prevent overshoot of input current during start-up. ADP2109 is available in a 5-bump WLCSP package.
ADP2108 has the same features and operation as the ADP2109, but ADP2108 without a discharge switch, the device is available in both WLCSP and TSOT packages.
Advantages and features:
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峰值效率：95%
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放电开关功能
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固定频率工作：3 MHz
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静态电流：18 μA(典型值)
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负载电流：600 mA(最大值)
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输入电压:：2.3 V至5.5 V
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采用小型多层电感和电容
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电流模式架构，以获得快速负载和线路瞬态响应
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100%占空比低压差模式
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内置同步整流器
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内部补偿
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欲了解更多特性，请参考数据手册