Preliminary
EUP3402
Dual 1A, 2.25MHz Synchronous
Step-Down DC/DC Regulator
DESCRIPTION
The EUP3402 is synchronous dual step-down DC-DC
converters optimized for battery powered portable
applications. It provides two independent output voltage
rails powered by 1-cell Li-Ion or 3-cell NiMH/NiCD
batteries. The device is also suitable to operate from a
standard 3.3V or 5V voltage rail.
With an input voltage range of 2.7V to 5.5V the
EUP3402 is ideal to power portable applications like
smart phones, PDAs and other portable equipment.
The EUP3402 operates at 2.25MHz fixed switching
frequency allowing the use of small inductors and
capacitors to achieve a small solution size. Each output
supports up to 1A load current, typical .The internal
synchronous switch increases efficiency and eliminates
the need for an external schottky diode.
The EUP3402 has a user selectable mode of forced PWM
and PFM/PWM mode. The forced PWM mode operation
provides the lowest ripple noise and the PFM mode
operation provides high efficiency at light loads.
The EUP3402 has internal soft start and avoids inrush
current during startup. When shutdown, internal resistor
discharges the output capacitor.
FEATURES
High Efficiency Up to 95%
2.25MHz Constant Switching Frequency
Dual 1A Available Load Current
45µA Typical Quiescent Current
2.7V to 5.5V Input Voltage Range
2 Channel 180 Degree Out of Phase Operation
Adjustable Output Voltage as Low as 0.6V
No Schottky Diode Required
Short Circuit and Thermal Protection
Power Good Output
Internal Soft Start Function
Available in 3mm
×
3mm TDFN-10 Package
RoHS Compliant and 100% Lead(Pb)-Free
Halogen-Free
APPLICATIONS
SSD Module
Smart Phones
Tablet PC
Portable Media Players
µC/µP,
FPGA and DSP Power
Plug-in DC/DC Modules for Routers and
Switchers
Typical Application Circuit
Figure1.
DS3402
Ver0.1
Sep. 2011
1
EUTECH [ EUTECH MICROELECTRONICS INC ]
