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EN5312Q

Fully Integrated Voltage Mode Synchronous Buck PWM DC-DC Converter Module

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ENPIRION

Preliminary

EN5312Q

Fully Integrated Voltage Mode Synchronous

Buck PWM DC-DC Converter Module

Rev 0.87 January , 2006

RoHS Compliant

VIN

UVLO

Thermal Limit

Current Limit

ENABLE

Soft Start

(-)

PWM

Comp

(+)

Sawtooth

Generator

P-Drive

N-Drive

VOUT

VSENSE

(-)

Error

Amp

(+)

VREF

DAC

Switch

VFB

Voltage

Select

Package Boundry

VS0 VS1 VS2

Product Highlights

• Revolutionary integrated inductor

• Total footprint as small as 28mm2

• Only two low cost MLCC caps required.

• Very low solution profile at 1.1mm.

• 4mm x 5mm x1.1mm QFN package

• Wide 2.4V to 5.5V input range.

• 1000mA output current.

• Less than 1 µA standby current.

• High efficiency, up to 95%.

• Very low ripple voltage; < 10mV

• 3 Pin VID Voltage select scheme.

• External divider option.

• 5 MHz switching frequency

• 2% accuracy over line, load, & temp.

• Short circuit, UVLO, and thermal protection.

• Stable with up to 100uF output

capacitance.

Product Overview

The Ultra-Low-Profile EN5312Q is targeted to

applications where board area and profile are

critical. EN5312Q is a complete power

conversion solution requiring only two low cost

ceramic MLCC caps. Inductor, MOSFETS,

PWM, and compensation are integrated into a

tiny 4mm x 5mm x 1.1mm QFN package.

Engineered to minimize all sources of converter

noise, the EN5312Q eases design and layout

constraints. 5 MHz switching frequency and

internal type III compensation provides superior

transient response. With a 1.1 mm profile, the

entire layout can occupy as little as 28mm2 of

board area.

A 3-pin VID output voltage select scheme

provides seven pre-programmed output voltages

along with an option for external resistor divider.

Output voltage can be programmed on-the-fly to

provide fast, dynamic voltage scaling.

Typical Application Circuit

VIN

4.7µF

Voltage

Select

ENABLE

Vin

VSense

Vout

PFM

VS0

VFB

VS1

VS2

GND

VOUT

10µF

Figure 1. Typical application circuit.

Applications

• Area constrained applications

• Set top box/home gateway

• Smart phones and PDAs.

• VoIP and Video phones

• Personal Media Players.

• Advanced Mobile Processors, DSP, IO,

Memory, Video, Multimedia Engines.

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