The QX3406 is a high-efficiency monolithic synchronous buck regulator using a constant frequency, current mode architecture. The device is available in an adjustable version and fixed output voltages of 1.5V and 1.8V.Supply current during operation is only 20μA and drops to ≤1μA is shutdown. The 2.5V to 5.5V input voltage range makes the QX3406 ideally suited for single Li-lon battery-powered applications.100% duty cycle provides low dropout operation, extending battery life in portable systems. Automatic Burst Mode operation increases efficiency at light loads. further extending battery life.
Switching frequency is internally set at 1.5MHz, allowing the use of small surface mount inductors and capacitors.
The internal synchronous switch increases efficiency and eliminates the need for an external Schottky diode. Low output voltages are easily supported with the 0.6V feedback reference voltage. The QX3406 is available in a low profile (1mm) Thin SOT package. ?
Features
????????? High Efficiency：Up to 96%
????????? Very Low Quiescent Current：Only 20μA ??????????????????During Operation
????????? 600mA Output Current
????????? 2.5V to 5.5v Input Voltage Range
????????? 1.5MHz Constant Frequency Operation
????????? No Schottky Diode required
????????? Low Dropout Operation:100% Duty Cycle
????????? 0.6V Reference allows low output voltages
????????? Shutdown mode draws≤1μA supply ????current
????????? Current mode operation for excellent line and load transient response
????????? Over temperature protected
????????? Low profile (1mm) Thin SOT package.
Applications
????????? Cellular telephones
????????? Personal information appliances
????????? Wireless and DSL modems
????????? Digital still cameras
????????? MP3 players
????????? Portable instruments
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