SP3406
600mA Buck Converter
DESCRIPTION
SP3406 is a high efficiency monolithic
synchronous buck regulator using a constant
frequency, current mode architecture. The device
is available in an adjustable version and fixed
output voltages, such as 1.5V,1.8V,etc. Supply
current with no load is 30uA and drops to <1uA in
shutdown. The 2.5 to 6.5V input voltage range
makes the SP3406 ideally suitable for single
Li-Ion, two to four AA battery-powered
applications. In low dropout operation mode, the
duty cycle can reach to 100%, extending battery
life in portable systems. PWM pulse skipping mode
operation provides very low output ripple voltage
for noise sensitive applications. 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. Low output voltages are
easily supported with the 0.6V feedback reference
voltage. The SP 3406 is available in a small
SOT-23-5 package.
APPLICATIONS
Digital Camera
PDA
Hand Held Communication Equipment
Wireless and DSL Modems
Portable instrument
Microprocessor and DSP Core Supplies
MID or UPMC
FEATURES
High Efficiency: Up to 96%;
1.5MHz Constant Switching Frequency;
600mA Output Current at Vin=3V;
Integrated Main Switch and Synchronous
Rectifier, No Schottky Diode Required;
2.5 to 6.5V input voltage;
Output Voltage as Low as 0.6V;
100% Duty Cycle in Dropout;
Quiescent Current: 30uA(input<4.2V);
Slope Compensated Current Mode Control for
Excellent Line and Load Transient Response;
Short Circuit Protection and Thermal Fault
Protection;
<1uA Shutdown Current;
Soft Start;
PIN CONFIGURATION ( SOT-23-5L)
PART MARKING
2012/11/15
V. 1
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SYNC-POWER [ SYNC POWER CROP. ]
