EUP3409
Dual 1.5MHz, 800mA Synchronous
Step-Down Converter
DESCRIPTION
The EUP3409 contains two independent 1.5MHz
constant frequency, current mode, PWM step-down
converters. Each converter integrates a main switch and
a synchronous rectifier for high efficiency without an
external Schottky diode. The EUP3409 is ideal for
powering portable equipment that runs from a single
cell Lithium-Ion (Li+) battery. Each converter can
supply 800mA of load current from a 2.5V to 5.5V
input voltage. The output voltage can be regulated as
low as 0.6V. The EUP3409 can also run at 100% duty
cycle for low dropout applications.
FEATURES
Up to 96% Efficiency
1.5MHz Constant Switching Frequency
800mA Load Current on Each Channel
2.5V to 5.5V Input Voltage Range
Output Voltage as Low as 0.6V
100% Duty Cycle in Dropout
Current Mode Operation
Short Circuit Protection
Thermal Fault Protection
<1µA Shutdown Current
Soft Start Function
Space Saving 10-Pin TDFN Package
RoHS Compliant and 100% Lead(Pb)-Free
APPLICATIONS
Cellular and Smart Phones
Microprocessors and DSP Core Supplies
PDAs and Portable Media Players
Wireless and DSL Modems
Digital Still and Video Cameras
Typical Application Circuit
Figure 1. Adjustable Voltage Regulator
DS3409
Ver1.0
Jan. 2008
1