EUP3475A
3A, 28V, 1MHz Synchronous
Step-Down Converter
DESCRIPTION
The EUP3475A is a 1MHz 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.
At heavy load, the EUP3475A operates at a fixed
frequency Pulse-Width Modulation mode for
excellent stability and transient response. At light
load, the EUP3475A will operates at a Pulse-
Skipping mode to save power.
The EUP3475A 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 EUP3475A is available in SOP-8 package
with the exposed pad.
FEATURES
Automatic Pulse Skipping Mode at Light Load
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
1MHz 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.
DS3475A Ver 1.2 Jul. 2010
1
EUTECH [ EUTECH MICROELECTRONICS INC ]
