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SP9718 Datasheet Preview

SP9718 Datasheet

1.5A LOW-NOISE PWM STEP-DOWN REGULATOR

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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.
APPLICATIONS
Cellular Phone
Cordless Phone
PDAs and Handy-Terminals
CPU I/O Supplies
Notebook Chipset Supplies
Battery Operated Devices
ADSL
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
PIN CONFIGURATION ( SOP-8 Power Pad )
PART MARKING
2007/12/20 Ver.1
Page 1




SYNC POWER

SP9718 Datasheet Preview

SP9718 Datasheet

1.5A LOW-NOISE PWM STEP-DOWN REGULATOR

No Preview Available !

SP9718
1.5A LOW-NOISE PWM STEP-DOWN REGULATOR
TYPICAL APPLCATION CIRCUIT
PIN DESCRIPTION & ELECTRICAL CHARACTERISTICS
Pin Symbol
Description
Operating Rating
Min.
Typ. Max. Unit
1 VIN Voltage supply for internal circuits
2 2.5 5.5 V
2 GND Ground for internal reference voltage divider
3 SD
CMOS input level
Shutdown level
Enable level
0.75 x VIN
0
VIN + 0.3 V
2.0
4 VREF VOUT Set Voltage
5 VFB Feedback node for the VOUT
6 PGND Ground for output power transistors
1.1 VIN V
VREF
V
7 LX
Inductor connection to the Drains of the internal
power MOSFETs
5.5 V
8 PVIN Voltage supply for output power transistors
2 2.5 5.5 V
2007/12/20 Ver.1
Page 2


Part Number SP9718
Description 1.5A LOW-NOISE PWM STEP-DOWN REGULATOR
Maker SYNC POWER
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