SP6669_12 Datasheet, PDF (1/11 Pages) Exar Corporation – 600mA 1.5MHz Synchronous Step Down Converter

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6 0 0 m A 1 .5 M H z Sy n ch r o n o u s St e p Do w n Co n v e r t e r
November 2012
GENERAL DESCRIPTION
The SP6669 is a synchronous current mode
PWM step down (buck) converter capable of
delivering up to 600mA of current. It features
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
power ed 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
adjustab le output voltage version, using an
external resistor divider circuit, as well as
fixed output voltage v ersions of 1.2V, 1.5V
and 1.8V.
Built - in over temperature and output over
voltage lock - out protections insure safe
operations under abnormal operating
conditions.
The SP6669 is offered in a RoHS compliant,
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APPLICATIONS
xPortable Equipments
xBattery Operated Equipments
xAudio - Video Equipments
xNetworking & Telecom Equipments
Rev. 2. 2.0
FEATURES
xGuaranteed 600mA Output Current
In put Voltage: 2.5V to 5.5V
x1.5MHz PWM Current Mode Control
100% Duty Cycle LDO Mode Operations
Achieves 95% Efficiency
xFixed/Adjustable Output Voltage
Range
As Low as 0.6V with ±3% Accuracy
1.2V, 1.5V, 1.8V Fixed Voltage Options
xExcellent Line/Load
Response
Transient
x200 µA Quiescent Current
xOver Temperature Protection
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5 - Pin SOT23 Package
TYPICAL APPLICATION DIAGRAM
Fig. 1: SP6669 Application Diagram (Adj. version shown)
Exar Corporation
48720 Kato Road, Fremont CA 94538, USA
www.exar.com
Tel. [phone] - 70 00 ±Fax. [phone] - 70 01