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Eutech Microelectronics

EUP3484 Datasheet Preview

EUP3484 Datasheet

340KHz Synchronous Step-Down Converter

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EUP3484
3A, 30V, 340KHz Synchronous
Step-Down Converter
DESCRIPTION
The EUP3484 is a synchronous current mode buck
regulator capable of driving 3A continuous load current
with excellent line and load regulation. The EUP3484
can operate with an input range 4.5V to 30V and the
output can be externally set from 0.925V to 20V 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 EUP3484 require a minimum number of external
components.
Typical Application Circuit
FEATURES
3A Output Current
220ns Minimum On Time
35V Input Surge Protection
Integrated 160m/110mDMOS Switches
4.5V to 30V Input Operating Range
Output Adjustable from 0.925V to 20V
Up to 95% Efficiency
1µA Shutdown Current
Fixed 340KHz Frequency
Programmable Soft-Start
Thermal Shutdown and Overcurrent Protection
Input Supply Overvoltage and Undervoltage
Lockout
Available in SOP-8 (EP) Package
RoHS Compliant and 100% Lead(Pb)-Free
Halogen-Free
APPLICATIONS
Distributed Power Systems
Networking Systems
PC Monitors
Portable Electronics
DS3484 Ver1.4 May 2012
Figure 1. 12V to 3.3V/5V Application Circuit
1




Eutech Microelectronics

EUP3484 Datasheet Preview

EUP3484 Datasheet

340KHz Synchronous Step-Down Converter

No Preview Available !

Typical Application Circuit (continued)
EUP3484
Pin Configurations
Package Type
Figure2. 24V to 3.3V/5V Application Circuit
Pin Configurations
SOP-8 (EP)
Pin Description
PIN PIN NAME
DESCRIPTION
1 BS
2 IN
3
4
9 (Exposed Pad)
SW
GND
5 FB
6 COMP
7 EN
8 SS
High-Side Gate Drive Boost Input. BS supplies the drive for the high-side N-Channel
DMOS switch. Connect a 0.01µF or greater capacitor from SW to BS to power the high
side switch.
Input Supply Pin. IN supplies the power to the IC, as well as the step-down converter
switches. Drive IN with a 4.5V to 30V power source. Bypass IN to GND with a suitably
large capacitor to minimize input ripple to the IC. See Input Capacitor Section of the
applications notes.
Power Switching Output. Connect the output LC filter from SW to the output load.
Ground. GND pin should be connected to the exposed thermal pad for proper operation.
This power thermal pad should be connected to PCB ground plane using multiple vias
for good thermal performance.
Output Feedback Input. FB senses the output voltage and regulates it. Drive FB with a
resistive voltage divider connected to it from the output voltage. The feedback threshold
is 0.925V. See Setting the Output Voltage.
Loop compensation Input. 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 high to
turn on the regulator; 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 Control Input. Connect an external capacitor to program the soft-start. If
unused, leave it open, which means internal soft-start function.
DS3484 Ver1.4 May 2012
2


Part Number EUP3484
Description 340KHz Synchronous Step-Down Converter
Maker Eutech Microelectronics
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