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Eutech Microelectronics

EUP3458 Datasheet Preview

EUP3458 Datasheet

1.2MHz Step-Down Converter

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EUP3458
1.2A,30V,1.2MHz Step-Down Converter
DESCRIPTION
The EUP3458 is current mode, step-down switching
regulator capable of driving 1.2A continuous load with
excellent line and load regulation. The EUP3458 can
operate with an input voltage range from 4.5V to 30V
and the output can be externally set from 0.8V to 15V
with a resistor divider.
Fault protection includes cycle-by-cycle current
limiting and thermal shutdown. In shutdown mode the
regulator draws 1µA of supply current. Internal
soft-start minimizes the inrush current and the output
overshoot.
The EUP3458 is available in SOT23-6 and TSOT23-6
packages.
FEATURES
1.2A Output Current
0.3Internal DMOS Output Switch
4.5V to 30V Input Operating Range
Output Adjustable from 0.8V to 15V
Up to 92% Efficiency
1µA Shutdown Current
Fixed 1.2MHz Frequency
Thermal Shutdown and Overcurrent Protection
Input Supply Undervoltage Lockout
Available in SOT23-6 and TSOT23-6 Packages
RoHS Compliant and 100% Lead(Pb)-Free
Halogen-Free
APPLICATIONS
Distributed Power Systems
Battery Charger
Pre-Regulator for Linear Regulators
WLED Drivers
Typical Application Circuit
DS3458 Ver0.2 Apr. 2011
Figure 1. 12V/24V to 3.3V Application Circuit
1




Eutech Microelectronics

EUP3458 Datasheet Preview

EUP3458 Datasheet

1.2MHz Step-Down Converter

No Preview Available !

Typical Application Circuit (continued)
EUP3458
Pin Configurations
Package Type
Figure 2. 12V/24V to 5V Application Circuit
Pin Configurations
SOT23-6
TSOT23-6
Pin Description
Pin
Name
SOT23-6
BS 1
GND
2
FB 3
EN 4
IN 5
SW 6
TSOT23-6
DESCRIPTION
High-Side Gate Driver Boostrap Supply. BS provides power to the gate
1 driver of n-channel MOSFET switch. Connect a 10nF or greater
capacitor from SW to BS.
Ground. This pin is the voltage reference for the regulated output
2 voltage. It should be kept away from the D1 and input capacitor for noise
prevention.
Output Feedback Input. FB senses the output voltage to regulate that
3 voltage. Connect FB to an external resistor divider to set the output
voltage. The value of the divider resistors also set loop bandwidth.
Enable Input. EN is a logic input that controls the regulator on or off.
4
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.
Input Supply Pin. IN supplies the power to the IC and the power
5
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.
6
Power Switcher Output. Connect the output LC filter from SW to the
output.
DS3458 Ver0.2 Apr. 2011
2


Part Number EUP3458
Description 1.2MHz Step-Down Converter
Maker Eutech Microelectronics
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EUP3458 Datasheet PDF






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