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EN5312QI

1A PowerSoC Synchronous Buck Regulator With Integrated Inductor

Altera Corporation 

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

• Revolutionary Integrated Inductor

• 5mm x 4mm x1.1mm QFN package

• Very small total solution foot print*

• 4 MHz switching frequency

• Only two low cost MLCC caps required

• Designed for low noise/low EMI

• Very low ripple voltage; 5mVp-p Typical

• High efficiency, up to 95%

• Wide 2.4V to 6.6V input range

• 1000mA continuous output current

• Less than 1 µA standby current.

• Excellent transient performance

• 3 Pin VID Output Voltage select

• External divider: 0.6V to VIN-Vdropout

• 100% duty cycle capable

• Short circuit and over current protection

• UVLO and thermal protection

• RoHS compliant; MSL 3 260°C reflow

Enpirion® Power Datasheet

EN5312QI 1A PowerSoC

Synchronous Buck Regulator

With Integrated Inductor

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

• Area constrained applications

• Noise Sensitive Applications such as A/V

and RF

• LDO replacement for improved thermals

• Lower Power FPGA and ASICs

• Smart phones, PDAs

• VoIP and Video phones

• Personal Media Players

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

04535

December 14, 2015

Rev E

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