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EN5312QI

1A Synchronous Buck Regulator With Integrated Inductor

Enpirion, Inc. 

EN5312QI

1A Synchronous Buck Regulator

With Integrated Inductor

Revised March 2007

RoHS Compliant

Featuring Integrated Inductor Technology

VIN

ENABLE

UVLO

Thermal Limit

Current Limit

Soft Start

(-)

PWM

Comp

(+)

Sawtooth

Generator

Logic

P-Drive

N-Drive

Compensation

Network

(-)

Error

Amp

(+)

VREF

DAC

Switch

VOUT

GND

VSENSE

VFB

Voltage

Select

Package Boundry

VS0 VS1 VS2

Product Highlights

• Integrated Planar Inductor

• Designed for low noise/low EMI

• Very small solution foot print*

• Only two low cost MLCC caps required

• RoHS compliant; MSL 3 260°C reflow

• 5mm x 4mm x1.1mm QFN package

• Wide 2.4V to 5.5V input range

• 1000mA continuous output current

• Less than 1 µA standby current.

• High efficiency, up to 95%

• Excellent transient performance

• Very low ripple voltage; 5mVp-p Typical

• 3 Pin VID Output Voltage select

• External divider: 0.6V to VIN-Vdropout

• 4 MHz switching frequency

• 100% duty cycle capable

• Short circuit and over current protection

• UVLO and thermal protection

Product Overview

The Ultra-Low-Profile EN5312QI is targeted to

applications where board area and profile are

critical. EN5312QI is a complete power

conversion solution requiring only two low cost

ceramic MLCC caps. Inductor, MOSFETS,

PWM, and compensation are integrated into a

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

EN5312QI is engineered to simplify design and

to minimize layout constraints. 4 MHz

switching frequency and internal type III

compensation provides superior transient

response. With a 1.1 mm profile, the

EN5312QI is ideal for space and height

constrained applications.

A 3-pin VID output voltage selector 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

VFB

VS0

VS1

VS2

GND

VOUT

10µF

Figure 1. Typical application circuit.

Applications

• LDO replacement for improved thermals

• FPGA, DSP, ASIC, IO & Peripherals

• Area constrained applications

• Set top box/home gateway

• Smart phones and PDAs

• VoIP and Video phones

• Personal Media Players

*Optimized PCB Layout file downloadable from the Enpirion Website to assure first pass design success.

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