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AIC2359

1A Dual Synchronous PWM-PSM Step-Down DC-DC Converter

FEATURES
  • Dual 1A Output
  • 2.5V to 5.5V Input Range
  • Accurate Reference 0.6V Provides Low Output Voltages
  • Adjustable Output Voltage
  • Up to 95% Efficiency
  • Stable with Low ESR Output Ceramic Capacitors
  • No Schottky Diode Required.
  • 65uA Quiescent Current per Channel.
  • 100% Duty Cycle in Low Dropout Operation.
  • 1.5MHz Fixed-Frequency PWM Operation
APPLICATIONS
  • Digital Still Cameras
  • Cellular Phones
  • Wireless and DSL Modems
  • Notebook Chipset Supplies.
  • PDAs and Handy-Terminals.
  • Battery-Operated Devices (1 Li-Ion or 3 NiMH/ NiCd).
DESCRIPTION
The AIC2359 is a dual output, low-noise, pulse-width-modulated (PWM), DC-DC stepdown converter. It powers logic and transmitters in small wireless systems such as cellular phones, communicating PDAs, and handy-terminals.
The device features an internal synchronous rectifier for high efficiency; it requires no external Schottky diode. Internally fixedfrequency 1.5MHz operation provides easy post-filtering and allows the use of small inductors and capacitors. The AIC2359 is ideally suited for Li-Ion battery applications. Shutdown mode places the device in standby, reducing supply current to under 1uA.
Other features of the AIC2359 include high efficiency, soft start, over temperature protection, and over current protection. It is available in a space-saving DFN-12 (3x3).
TYPICAL APPLICATION


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