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.
FEATURES
High Efficiency up to 96%
1.5MHz Constant Switching Frequency
800mA Available Load Current
270µA Typical Quiescent Current
2.5V to 5.5V Input Voltage Range
Adjustable Output Voltage as Low as 0.6V
100% Duty Cycle Low Dropout Operation
No Schottky Diode Required
Short Circuit and Thermal Protection
Excellent Line and Load Transient Response
＜1µA
Shutdown Current
Soft Start Function
Over Voltage Protection
Available in 1.2V,1.8V,3.3V and adjustable
voltages
Available in SOT23-5, TSOT23-5 Package
RoHS Compliant and 100% Lead(Pb)-Free
APPLICATIONS
Cellular and Smart Phones
Portable Media Players/ MP3 Players
Digital Still and Video Cameras
Portable Instruments
WLAN PC Cards
Typical Application Circuit
Figure 1. Adjustable Output
DS3408 Ver1.2
Nov. 2007
1
EUTECH [ EUTECH MICROELECTRONICS INC ]
