EUP3408 Datasheet, PDF (1/11 Pages) Eutech Microelectronics Inc – 1.5MHz, 800mA Synchronous Step-Down Converter with Soft Start

EUP3408
1.5MHz, 800mA Synchronous
Step-Down Converter with Soft Start
DESCRIPTION
The EUP3408 is a constant frequency, current mode,
PWM step-down converter. The device integrates a
main switch and a synchronous rectifier for high
efficiency. The 2.5V to 5.5V input voltage range makes
the EUP3408 ideal for powering portable equipment
that runs from a single cell Lithium-Ion (Li+) battery or
3-cell NiMH/ NiCd batteries. The output voltage can be
regulated as low as 0.6V. The EUP3408 supports up to
800mA load current and can also run at 100% duty
cycle for low dropout applications, extending battery
life in portable systems.
Switching frequency is internally set at 1.5MHz,
allowing the use of small surface mount inductors and
capacitors. The internal synchronous switch increases
efficiency while eliminates the need for an external
Schottky diode. The EUP3408 is available in an
adjustable version and fixed output voltage of
1.2V ,1.8V and 3.3V.
Typical Application Circuit
FEATURES
z High Efficiency up to 96%
z 1.5MHz Constant Switching Frequency
z 800mA Available Load Current
z 270µA Typical Quiescent Current
z 2.5V to 5.5V Input Voltage Range
z Adjustable Output Voltage as Low as 0.6V
z 100% Duty Cycle Low Dropout Operation
z No Schottky Diode Required
z Short Circuit and Thermal Protection
z Excellent Line and Load Transient Response
z
1µA Shutdown Current
z Soft Start Function
z Over Voltage Protection
z Available in 1.2V,1.8V,3.3V and adjustable
voltages
z Available in SOT23-5, TSOT23-5 Package
z RoHS Compliant and 100% Lead(Pb)-Free
APPLICATIONS
z Cellular and Smart Phones
z Portable Media Players/ MP3 Players
z Digital Still and Video Cameras
z Portable Instruments
z WLAN PC Cards
DS3408 Ver1.2 Nov. 2007
Figure 1. Adjustable Output
1