FN7525 Rev 2.00

Page 1 of 16

December 16, 2014

FN7525

Rev 2.00

December 16, 2014

ISL8014A

4A Low Quiescent Current 1MHz High Efficiency Synchronous Buck Regulator

DATASHEET

The ISL8014A is a high efficiency, monolithic, synchronous

step-down DC/DC converter that can deliver up to 4A

continuous output current from a 2.8V to 5.5V input supply. It

uses a current control architecture to deliver very low duty

cycle operation at high frequency with fast transient response

and excellent loop stability.

The ISL8014A integrates a pair of low ON-resistance P-Channel

and N-Channel internal MOSFETs to maximize efficiency and

minimize external component count. The 100% duty-cycle

operation allows less than 400mV dropout voltage at 4A

output current. High 1MHz pulse-width modulation (PWM)

switching frequency allows the for use of small external

components and the SYNC input enables multiple ICs to

synchronize out-of-phase to reduce ripple and eliminate beat

frequencies.

The ISL8014A can be configured for discontinuous or forced

continuous operation at light load. Forced continuous

operation reduces noise and RF interference while

discontinuous mode provides high efficiency by reducing

switching losses at light loads.

Fault protection is provided by internal hiccup mode current

limiting during short circuit and overcurrent conditions, an

output overvoltage comparator and over-temperature monitor

circuit. A power-good output voltage monitor indicates when

the output is in regulation.

The ISL8014A is offered in a space saving 4mmx4mm QFN,

lead free package with exposed pad lead frames for low

thermal resistance.

The ISL8014A offers a 1ms power-good (PG) timer at

power-up. When shutdown, ISL8014A discharges the output

capacitor. Other features include internal soft-start, internal

compensation, overcurrent protection, and thermal shutdown.

The ISL8014A is offered in a 16 Ld 4mmx4mm QFN package

with 1mm maximum height. The complete converter occupies

Features

• High efficiency synchronous buck regulator with up to 97%

efficiency

• Power-good (PG) output with a 1ms delay

• 2.8V to 5.5V supply voltage

• 3% output accuracy over-temperature/load/line

•4A output current

• Pin compatible to ISL8013A

• Start-up with prebiased output

• Internal soft-start - 1ms

• Soft-stop output discharge during disabled

• 35µA quiescent supply current in PFM mode

• Selectable forced PWM mode and PFM mode

• External synchronization up to 4MHz

• Less than 1µA logic controlled shutdown current

• 100% maximum duty cycle

• Internal current mode compensation

• Peak current limiting and hiccup mode short-circuit

protection

• Over-temperature protection

• Small 16 Ld 4mmx4mm QFN

• Pb-Free (RoHS compliant)

Applications

• DC/DC POL modules

• µC/µP, FPGA and DSP power

• Plug-in DC/DC modules for routers and switchers

•Portable instruments

• Test and measurement systems

• Li-ion battery powered devices

• Small form factor (SFP) modules

• Barcode readers