The ISL80121-5 is a low dropout voltage, single output LDO with
programmable current limiting. The ISL80121-5 operates from
input voltages of 5V to 6V with a nominal output voltage of 5V.
Other custom voltage options are available upon request.
A sub-micron BiCMOS process is utilized for this product family to
deliver the best in class analog performance and overall value.
The programmable current limiting improves system reliability of
end applications. An external capacitor on the soft-start pin
provides an adjustable soft-starting ramp. The ENABLE feature
allows the part to be placed into a low quiescent current
shutdown mode.
This BiCMOS LDO will consume significantly lower quiescent
current as a function of load compared to bipolar LDOs, which
translates into higher efficiency and packages with smaller
footprints. Quiescent current is modestly compromised to
achieve a very fast load transient response.

Features
• ±1.8% VOUT Accuracy Guaranteed Over Line, Load and
TJ = -40°C to +125°C
• Very Low 130mV Dropout Voltage at VIN = 5.0V
• High Accuracy Current Limit Programmable up to 1.75A
• Very Fast Transient Response
• 210µVRMS Output Noise
• Power-Good Output
• Programmable Soft-Start
• Over-Temperature Protection
• Small 10 Ld DFN Package

Applications
• USB devices
• Telecommunications and Networking
• Medical Equipment
• Instrumentation Systems
• Routers and Switchers
• Gaming