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Eutech Microelectronics

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EUP3451 Datasheet

500KHz Step-Down Converter

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EUP3451
3A,30V,500KHz Step-Down Converter
DESCRIPTION
The EUP3451 is current mode, step-down switching
regulator capable of driving 3A continuous load with
excellent line and load regulation. The EUP3451 can
operate with an input voltage range from 4.5V to 30V
and the output can be externally set from 0.8V to 12V
with a resistor divider.
Fault condition protection includes cycle-by-cycle
current limiting and thermal shutdown. In shutdown
mode the regulator draws 1µA of supply current.
Programmable soft-start minimizes the inrush supply
current and the output overshoot at initial startup.
The EUP3451 require a minimum number of external
components.
FEATURES
z 35V Input Surge Protection
z 3A Output Current
z 0.135 Internal DMOS Output Switch
z 4.5V to 30V Input Operating Range
z Output Adjustable from 0.8V to 12V
z Up to 95% Efficiency
z 1µA Shutdown Current
z Fixed 500KHz Frequency
z Thermal Shutdown and Overcurrent Protection
z Input Supply Overvoltage and Undervoltage
Lockout
z Available SOP-8 Package
z RoHS Compliant and 100% Lead(Pb)-Free
APPLICATIONS
z PC Monitors
z Distributed Power Systems
z Networking Systems
z Portable Electronics
Typical Application Circuit
DS3451 Ver1.0 June 2009
Figure 1. 12V to 3.3V/5V Application Circuit
1




Eutech Microelectronics

EUP3451 Datasheet Preview

EUP3451 Datasheet

500KHz Step-Down Converter

No Preview Available !

Tel: 0755-8398 3377 / 135 9011 2223 http://www.gofotech.com
Typical Application Circuit (continued)
EUP3451
Pin Configurations
Package Type
Figure 2. 24V to 3.3V/5V Application Circuit
Pin Configurations
SOP-8
Pin Description
Pin Name SOP-8
BS 1
IN
SW
GND
FB
COMP
EN
SS
2
3
4
5
6
7
8
DESCRIPTION
High-Side Gate Driver Boostrap Supply. BS provides power to the gate driver of
high-side n-channel MOSFET switch. Connect a 10nF or greater capacitor from SW
to BS.
Input Supply Pin. IN supplies the power to the IC and the high side power switch.
Connect IN to a 4.5V to 30V power source. Bypass IN to GND with a suitably
large value capacitor to minimize input ripple to the IC. See Input Capacitor
Section of the applications notes.
Power Switcher Output. Connect the output LC filter from SW to the output.
Ground.
Output Feedback Input. FB senses the output voltage to regulate that voltage. Connect
FB to an external resistor divider to set the output voltage. The feedback threshold is
0.788V. See Setting the Output Voltage.
Loop compensation pin. Connect a series RC network from COMP to GND to
compensate the regulation control loop. See Compensation.
Enable Input. EN is a logic input that controls the regulator on or off. Drive EN logic
high to turn on the regulator, and set EN logic low to turn it off. Don't leave EN pin
floating. Directly connect EN to IN (or through a resistance) for automatic startup.
Soft-start. Connect SS to an external capacitor to program the soft-start.
If unused ,leave it open,which means internal soft-start function.
DS3451 Ver1.0 June 2009
2


Part Number EUP3451
Description 500KHz Step-Down Converter
Maker Eutech Microelectronics
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