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EUP3453 Datasheet

200KHz Step-Down Converter

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EUP3453
3A,40V,200KHz Step-Down Converter
DESCRIPTION
The EUP3453 is current mode, step-down switching
regulator capable of driving 3A continuous load with
excellent line and load regulation. The EUP3453
operates with an input voltage range from 4.75V to
40V and the output voltage is externally set from
0.92V to 15V with a resistor divider. The output
current threshold is programmed by an external resistor.
The EUP3453 enters into the CC (constant current)
mode when output reaches over current threshold. The
OV (over voltage) threshold is programmed by an
external resistor divider. The EUP3453 stops switching
when output reaches over voltage threshold.
Fault condition protection includes secondary
cycle-by-cycle current limit and thermal shutdown. In
shutdown mode the regulator draws 3µA of supply
current. Internal soft-start minimizes the inrush supply
current and the output overshoot at initial startup.
The EUP3453 require a minimum number of external
components.
FEATURES
4.75V to 40V Wide Input Operating Range
Output Adjustable from 0.92V to 15V
Up to 3A Output Current
Programmable Output Current Threshold
Programmable Output Over Voltage Threshold
3µA Low Shutdown Current
0.1Internal DMOS Output Switch
Up to 95% Efficiency
Fixed 200kHz Switching Frequency
Internal Soft Start
Secondary Cycle-by-Cycle Current Limit
Thermal Shutdown
Input Supply Undervoltage Lockout
Available SOP-8 (EP) Package
RoHS Compliant and 100% Lead(Pb)-Free
Halogen-Free
APPLICATIONS
Car Charger/Adaptor
Rechargeable Portable Devices
Distributive Power Systems
Pre-regulator for Linear Regulators
Typical Application Circuit
DS3453 Ver1.2 May 2012
Figure 1. 5V Application Circuit
1




Eutech Microelectronics

EUP3453 Datasheet Preview

EUP3453 Datasheet

200KHz Step-Down Converter

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Pin Configurations
Package Type
Pin Configurations
EUP3453
SOP-8 (EP)
Pin Description
Pin Name
BST
VIN
SW
SOP-8 (EP)
1
2
3
DESCRIPTION
High-Side Gate Driver Boostrap Supply. BST provides power to the gate driver of
high-side n-channel MOSFET switch. Connect a 10nF or greater capacitor from
SW to BST.
Input Supply Pin. IN supplies the power to the IC and the high side power switch.
Connect IN to a 4.75V to 40V 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.
GND
FB
COMP
OCSET
OVEN
Thermal
Pad
4 Ground.
Output Feedback Input. FB senses the output voltage to regulate that voltage.
5 Connect FB to an external resistor divider to set the output voltage. The feedback
threshold is 0.92V. See Setting the Output Voltage.
6
Loop compensation pin. Connect a series RC network from COMP to GND to
compensate the regulation control loop. See Compensation.
7
OC (output current ) threshold setting pin. Connect a resistor from OCSET to GND
to program the output current. See Setting the Output Current Threshold.
OV (output over voltage ) threshold setting pin and enable Input. Must Connect to
a resistor divider between VOUT and GND to set the output over voltage
8 threshold and achieve automatic startup. Drive OVEN logic high to turn off the
regulator. Don't leave OVEN pin floating. See Setting the Output Over Voltage
Threshold.
- Ground. ( Thermal pad must be connected to the ground of PCB.)
DS3453 Ver1.2 May 2012
2


Part Number EUP3453
Description 200KHz Step-Down Converter
Maker Eutech Microelectronics
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EUP3453 Datasheet PDF






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