The ISL8501 is a high-performance, triple output controller
that provides a single, high frequency power solution for a
variety of point of load applications. The ISL8501 integrates
a 1A standard buck PWM controller and switching MOSFET
with two 500mA LDOs.
The PWM controller in the ISL8501 drives an internal
switching N-Channel power MOSFET and requires an
external Schottky diode to generate an output voltage from
0.6V to 20V. The integrated power switch is optimized for
excellent thermal performance up to 1A of output current.
The standard buck input voltage range supports a fixed 5V
or variable 6V to 25V range. The PWM regulator switches at
a fixed frequency of 500kHz and utilizes simple voltage
mode control with input voltage feed forward to provide
flexibility in component selection and minimize solution size.
Protection features include overcurrent, undervoltage, and
thermal overload protection integrated into the IC. The
ISL8501 power good signal output indicates loss of
regulation on the PWM output.
The ISL8501 features two adjustable LDO regulators using
internal PMOS transistors as pass devices. Separate enable
pins (EN_LDO1, EN_LDO2) control each LDO output. A
single power good signal output indicates loss of regulation
on either of the two LDO outputs. Independent overcurrent
and thermal fault shutdown monitors are integrated into the
LDO section.
ISL8501 is available in a small 4mmx4mm Quad Flat No- Lead (QFN) package.