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FAN49100 — 2.5 A, 1.8 MHz, TinyPower™ Buck-Boost Regulator
November 2016
FAN49100 — 2.5 A, 1.8 MHz, TinyPower™ Buck-Boost
Regulator
Features
24 µA Typical PFM Quiescent Current
Above 95% Efficiency
Total Layout Area = 11.61 mm
2
Description
The FAN49100 is a high efficiency buck-boost switching
mode regulator which accepts input voltages either
above or below the regulated output voltage. Using full-
bridge architecture with synchronous rectification, the
FAN49100 is capable of delivering up to 2.5 A at 3.6 V
input while regulating the output at 3.3 V. The
FAN49100 exhibits seamless transition between step-up
and step-down modes reducing output disturbances.
At moderate and light loads, Pulse Frequency Modulation
(PFM) is used to operate the device in power-save mode
to maintain high efficiency. In PFM mode, the part still
exhibits excellent transient response during load steps. At
moderate to heavier loads or Forced PWM mode, the
regulator switches to PWM fixed-frequency control. While
in PWM mode, the regulator operates at a nominal fixed
frequency of 1.8 MHz, which allows for reduced external
射频识别(Radio Frequency Identification，RFID)技术是一种利用无线射频通信实现的非接触式自动识别技术，与目前广泛采用的条形码技术相比，RFID具有容量大、识别距离远、穿透能力强、抗污性强等特点。RFID技术已经发展得比较成熟并获得了大规模商用，但超高频RFID技术相对滞后。本文分析了射频芯片nRF9E5的功能特性，并将其用于RFID系统中，设计了一套有源超高频(...[详细]
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