SP9718
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, communicating 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