SP6659_06 Datasheet, PDF (1/11 Pages) Sipex Corporation – 1.5MHz, 600mA Synchronous Buck Regulator

SP6659
1.5MHz, 600mA Synchronous Buck Regulator
FEATURES
■ 94% Efficiency Possible
■ 600mA Output Current at V_IN = 3.6V
■ 2.5V to 5.5V Input Voltage Range
■ 1.5MHz constant frequency operation
■ No Schottky Diode Required
■ Output Voltages as low as 0.6V
■ Slope Compensated Current Mode
Operation for Excellent Line and Load
Transient Response
■ 100 % Duty Cycle in LDO Mode
■ <1μA Shutdown Current, Quiescent
Current of 300 μA
■ Over-temperature protected
■ Pin Compatible to LTC3406B
■ Offered in Low Profile TSOT-23
package
VFB
VIN
VOUT
VIN
5
4
5
4
SP6659
5 Pin TSOT-23
SP6659
5 Pin TSOT-23
1
2
3
RUN
GND
SW
Adjustable
1
2
3
RUN
GND
SW
Fixed
Now Available in Lead Free Packaging
APPLICATIONS
■ Cell Phones
■ Wireless and DSL Modems
■ DSC's
■ Portable Instruments
DESCRIPTION
The SP6659 is a 600mA synchronous buck regulator using a constant frequency, current mode
architecture. The output voltage can be programmed using an external resistor divider. The 2.5V
to 5.5V input voltage range is ideal for portable applications that use a Li-Ion battery. Switching
frequency is internally set at 1.5MHz, allowing the use of small surface mount inductors and
capacitors. The internal synchronous switch increases efficiency and eliminates the need for an
external Schottky diode. The output voltage can be programmed using an external resistor
divider. Low output voltages are easily supported with the 0.6V feedback reference voltage. The
SP6659 is available in a low profile 5 pin TSOT-23 package.
TYPICAL APPLICATION SCHEMATICS
V _IN
4.7μF
Ceramic
®
2.2μH
SW
4
3
SP6659
RUN
1
R1
V _FB
5
2
R2
GND
V _OUT
V _IN
Cf
100pF
10μF
4.7μF
Ceramic ^Ceramic
®
4 _SP6659 3 ^SW
2.2μH
RUN ₁
5 ^VOUT
2
GND
V _OUT
10μF
Ceramic
Adjustable
Fixed
Date: 9/25/06 Rev C
SP6659 1.5MHz, 600mA Synchronous Buck Regulator
1
© 2006 Sipex Corporation