3A, 28V, 500kHz Synchronous
Step-Down Converter
DESCRIPTION
The EUP3476 is a 500KHz fixed frequency
synchronous current mode buck regulator. The device
integrates both 135mΩ high-side switch and 90mΩ
low-side switch that provide 3A of continuous load
current over a wide operating input voltage of 4.5V to
28V.The internal synchronous power switch increases
efficiency and eliminates the need for an external
Schottky diode. Current mode control provides fast
transient response and cycle-by-cycle current limit.
The EUP3476 features short circuit and thermal
protection circuits to increase system reliability.
Externally programmable soft-start allows for proper
power on sequencing with respect to other power
supllies and avoids input inrush current during startup.
In shutdown mode, the supply current drops below
1µA. The EUP3476 is available in SOP-8 package
with the exposed pad.
EUP3476
FEATURES
3A Continuous Output Current
110ns Minimum On Time
Integrated 135mΩ High Side Switch
Integrated 90mΩ Low Side Switch
Wide 4.5V to 28V Operating Input Range
Output Adjustable from 0.8V to 24V
Up to 95% Efficiency
Programmable Soft-Start
<1µA Shutdown Current
Available in 500KHz Fixed Switching
Frequency
Thermal Shutdown and Over Current Protection
Input Under Voltage Lockout
Available in SOP-8 (EP) Package
RoHS Compliant and 100% Lead(Pb)-Free
Halogen-Free
APPLICATIONS
Distributed Power Systems
Networking Systems
FPGA, DSP, ASIC Power Supplies
Typical Application Circuit
Figure 1.
EUP3476
Ver 1.1 Oct. 2009
1
EUTECH [ EUTECH MICROELECTRONICS INC ]
