EUP3475A Datasheet, PDF (1/1 Pages) Eutech Microelectronics Inc – 3A, 28V, 1MHz Synchronous Step-Down Converter

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
z Automatic Pulse Skipping Mode at Light Load
z 3A Continuous Output Current
z 110ns Minimum On Time
z Integrated 135mΩ High Side Switch
z Integrated 90mΩ Low Side Switch
z Wide 4.5V to 28V Operating Input Range
z Output Adjustable from 0.8V to 24V
z Up to 95% Efficiency
z Programmable Soft-Start
z <1μA Shutdown Current
z 1MHz Fixed Switching Frequency
z Thermal Shutdown and Over Current Protection
z Input Under Voltage Lockout
z Available in SOP-8 (EP) package
z RoHS Compliant and 100% Lead(Pb)-Free
Halogen-Free
APPLICATIONS
z Distributed Power Systems
z Networking Systems
z FPGA, DSP, ASIC Power Supplies
Typical Application Circuit
DS3475A Ver 1.2 Jul. 2010
Figure 1.
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