SP9718 Datasheet | SYNC POWER

1.5A LOW-NOISE PWM STEP-DOWN REGULATOR DESCRIPTION The SP9718 is low-noise pulse-width-modulated, DC-DC step-down converter. It powers logic and transmitters in small wireless systems such as cellular phones, municating PDAs, and handy-terminals. The device Features an internal synchronous rectifier for high efficiency; it requires no external Schottky diode. Excellent noise characteristics and fixed-frequency operation provide easy post-filtering. The SP9718 is ideally suited for Li-Ion battery applications. It is also useful for +3V or +5V fixed input applications. The device operates in one of four modes. Forced PWM mode operates at a fixed frequency regardless of the load. Shutdown mode places the device in standby, reducing quiescent supply current to under 0.1μA. The SP9718 can deliver over 1.5A. The output voltage can be adjusted from VREF to VIN. The input range is from 2.0V to 5.0V. Other Features of the SP9718 include high efficiency, low dropout voltage. It is available in a space-saving 8-pin SOP package. Features - 1.2MHz switching and synchronization - Dynamic output-voltage adjustment from VREF to VIN - 1.5A Guaranteed Output Current - 95% Efficiency - No Schottky Diode Required - External Soft Start - 8-pin PSOP power packages APPLICATIONS - Cellular Phone - Cordless Phone - PDAs and Handy-Terminals - CPU I/O Supplies - Notebook Chipset Supplies - Battery Operated Devices - ADSL PIN CONFIGURATION ( SOP-8 Power Pad ) PART MARKING 2007/12/20 Ver.1 Page 1 1.5A LOW-NOISE PWM STEP-DOWN REGULATOR TYPICAL APPLCATION CIRCUIT PIN DESCRIPTION & ELECTRICAL CHARACTERISTICS Pin 1 2 3 4 5 6 7 8 Symbol VIN GND SD VREF VFB PGND LX PVIN Description Voltage supply for internal circuits Ground for internal reference voltage divider CMOS input level VOUT Set Voltage Feedback node for the VOUT Ground for output power transistors Inductor connection to the Drains of the internal power MOSFETs Voltage supply for output power transistors 2 2.5 5.5...