EUP3291

DS3291

Ver1.0

Mar. 2013

1

1.5A, 2.25MHz Synchronous

Step-Down DC/DC Regulator

DESCRIPTION

The EUP3291 is synchronous step-down DC-DC

converters optimized for battery powered portable

applications. The 2.7V to 5.5V input voltage range

makes EUP3291 ideal for powering portable equipment

that runs from 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.

The EUP3291 operates at 2.25MHz fixed switching

frequency allowing the use of small inductors and

capacitors to achieve a small solution size. The internal

synchronous switch increases efficiency and eliminates

the need for an external schottky diode. The EUP3291

has internal soft start and avoids inrush current during

startup.

The EUP3291 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 EUP3291 is available in TDFN-6 package and it

provides up to 1.5A output current.

Typical Application Circuit

FEATURES

High Efficiency Up to 95%

2.25MHz Constant Switching Frequency

1.5A Available Load Current

30µA Typical Quiescent Current

2.7V to 5.5V Input Voltage Range

Adjustable Output Voltage as Low as 0.6V

No Schottky Diode Required

Short Circuit and Thermal Protection

Internal Soft Start Function

Available in TDFN-6 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

Figure 1.