SP6669 Datasheet, PDF (1/10 Pages) Exar Corporation – 1.5MHZ, 600mA SYNCHRONOUS STEP DOWN CONVERTER

SP6669
1.5MHZ, 600mA SYNCHRONOUS STEP DOWN CONVERTER
FEATURES
ƒ Up to 600mA Output Current
ƒ Up to 95% Efficiency
ƒ 1.5MHz Constant Frequency Operation
ƒ Low Dropout Operation Mode: 100% Duty Cycle
ƒ Output Voltages as low as 0.6V
ƒ No Schottky Diode Required
ƒ 200μA Quiescent Current (no load)
ƒ Excellent Line and Load Transient Response
ƒ Over-Temperature Protection
ƒ 2.5V to 5.5V Input Voltage Range
ƒ Lead Free SOT23-5 Package
APPLICATIONS
ƒ Cellular Phones
ƒ Wireless Networking
ƒ Digital Cameras
ƒ Portable Media Players
ƒ Bluetooth Devices
ƒ Portable Instruments
DESCRIPTION
The SP6669 is a 600mA synchronous buck converter using a constant frequency current
mode architecture with pulse width modulation (PWM) for low output voltage ripple and
fixed frequency noise, a pulse skip mode (PSM) for light load efficiency and a LDO mode for
100% duty cycle. With a 2.5V to 5.5V input voltage range and a 1.5MHz switching
frequency, the SP6669 allows the use of small surface mount inductors and capacitors ideal
for battery powered portable applications. The internal synchronous switch increases
efficiency and eliminates the need for an external Schottky diode. Low output voltages are
easily supported with the 0.6V feedback reference voltage. The SP6669 is available in an
adjustable output voltage version, using an external resistor divider circuit, as well as fixed
output voltage versions of 1.2V, 1.5V and 1.8V. The SP6669 is available in a 5 pin SOT-23
package.
TYPICAL APPLICATION CIRCUIT
Rev G – 12/02/2008
SP6669 1.5MHz 0.6A Sync. Step Down Converter © 2008 Exar Corporation
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