The ISL8026, ISL8026A are highly efficient, monolithic,

synchronous step-down DC/DC converters that can deliver 6A of

continuous output current from a 2.5V to 5.5V input supply. The

devices use current mode control architecture to deliver a very low

duty cycle operation at high frequency with fast transient

response and excellent loop stability.

The ISL8026, ISL8026A integrate a very low ON-resistance

P-Channel (36mΩ) high-side FET and N-Channel (13mΩ)

low-side FET to maximize efficiency and minimize external

component count. The 100 duty-cycle operation allows less

than 180mV dropout voltage at 6A output current. The

operation frequency of the Pulse-width Modulator (PWM) is

adjustable from 500kHz to 4MHz. The default switching

frequency, which is set by connecting the FS pin high, is 1MHz

for the ISL8026 and 2MHz for the ISL8026A.

The ISL8026, ISL8026A can be configured for discontinuous or

forced continuous operation at light load. Forced continuous

operation reduces noise and RF interference, while

discontinuous mode provides higher efficiency by reducing

switching losses at light loads.

Fault protection is provided by internal hiccup mode current

limiting during short-circuit and overcurrent conditions. Other

protection, such as overvoltage and over-temperature, are also

integrated into the device. A power-good output voltage

monitor indicates when the output is in regulation.

The ISL8026, ISL8026A offer a 1ms Power-good (PG) timer at

power-up. When in shutdown, the ISL8026, ISL8026A

discharge the output capacitor through an internal soft-stop

switch. Other features include internal fixed or adjustable

soft-start and internal/external compensation.

The ISL8026, ISL8026A are offered in a space saving 16 Ld

3x3 Pb-free TQFN package with an exposed pad for improved

thermal performance and 0.8mm maximum height. The

complete converter occupies less than 0.22 in2 area.

Features

? 2.5V to 5.5V input voltage range

? Very low ON-resistance FET’s - P-channel 36mΩ and

N-channel 13mΩ typical values

? High efficiency synchronous buck regulator with up to 95

efficiency

? 1 reference accuracy over load/line/temperature (-40°C

to +85°C)

? Internal soft-start: 1ms or adjustable

? Soft-stop output discharge during disable

? Adjustable frequency from 500kHz to 4MHz - default at

1MHz (ISL8026) or 2MHz (ISL8026A)

? External synchronization up to 4MHz

? Over-temperature, overcurrent, overvoltage and negative

overcurrent protection

Applications

? DC/DC POL modules

? μC/μP, FPGA and DSP power

? Video processor/SOC power

? Li-ion battery powered devices

? Routers and switchers

? Portable instruments

? Test and measurement systems

? Industrial PCs