DESCRIPTION
The SP6652 is high efficiency, synchronous buck regulator ideal for portable applications using one Li-Ion cell, with up to 1A output current. The 1.2MHz switching frequency and PWM control loop are optimized for small value inductor and ceramic output capacitor, for space constrained portable designs. At light load, the SP6652 can operate in either PFM mode for high efficiency, or PWM mode for constant frequency. In addition, the input voltage range of 2.7V to 5.5V; excellent transient response, output accuracy, and ability to transition into 100% duty cycle operation, further extending useful battery life, make the SP6652 a superior choice for a wide range of portable power applications. The output voltage is externally programmable down to 0.75V. A logic level shutdown control, external clock synchronization, and forced-PWM or automatic control inputs are provided. Other features include soft-start, over current protection and 140(C over-temperature shutdown.

FEATURES
■ 1A Output Current
■ 1.2MHz Constant Frequency Operation
■ 97% Efficiency Possible
■ Pin Selectable Forced PWM or PWM/PFM Modes
■ Ultra Low Quiecent Current in PFM Mode: 50µA
■ 500nA (Max.) Shutdown Current
■ Output Adjustable Down to 0.75V
■ No External FETs or Schottky Diode Required
■ Uses Small Value Inductors and Ceramic Output Capacitors
■ Low Dropout Operation: 100% Duty Cycle
■ Soft Start and Thermal Shutdown Protection
■ Easy Frequency Synchonization
■ Small 10 Pin MSOP and 10 Pin DFN Package

APPLICATIONS
■ Mobile Phones
■ PDAs
■ DSCs
■ MP3 Players
■ USB Devices
■ Point of Use Power