EUP3485
4A, 21V, 500KHz Synchronous
Step-Down Converter
DESCRIPTION
The EUP3485 is a 500KHz fixed frequency
synchronous current mode buck regulator. The device
integrates both 110m high-side switch and 30m
low-side switch that provide 4A of continuous load
current over a wide operating input voltage of 4.5V to
21V. 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 EUP3485 features short circuit and thermal
protection circuits to increase system reliability. In
shutdown mode, the supply current drops below 1µA.
The EUP3485 is available in SOP-8 package with an
exposed pad.
FEATURES
4A Continuous Output Current
100ns Minimum On Time
Integrated 110m High-side Switch
Integrated 30m Low-side Switch
Wide 4.5V to 21V Operating Input Range
Output Adjustable from 0.8V
Fixed 500KHz Switching Frequency
Sync from 300KHz to 2MHz External Clock
Internal Compensation
Internal Soft-Start
<1µA Shutdown Current
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
Notebook Systems and I/O Power
Flat Panel Television and Monitors
Personal Video Recorders
Digital Set Top Boxes
Typical Application Circuit
Figure 1.
DS3485
Ver1.2
Mar. 2011
1
EUTECH [ EUTECH MICROELECTRONICS INC ]
