The HL7505 is a synchronous buck converter
optimized to supply different sub systems of
portable applications. Its input voltage range is
2.5-5.5V.
The HL7505 can deliver up to 3A with 80%
efficiency while maintaining over 80% efficiency
at load currents as low as 10mA. It operates at a
high frequency of 2.2MHz, which greatly reduces
the value of the external components. A wide
range of output capacitors can be used to
optimize VOUT stability during load transients.
The inductors 0.33μH may be used without
affecting loop stability.

The HL5095 is a slew-rate controlled, low Rds(on) over-voltage protection device. It is used in between a power source and a load to protect and isolate power source against unwanted abnormal voltage and current condition. Especially, in the OTG mode of smartphones, the HL5095 could be placed between OTG boost regulator and USB port. The HL5095 can protect boost regulator from over-voltage or over-current USB conditions in smartphones.

The HL7090 is a compact, flexible, high-efficiency, USB compliant switch-mode charge management device for single cell Li-ion and Li-polymer battery used in the applications of ear pods and e-cigarettes. The charge parameters can be programmed through I2C interface (HL7090FN03 version). The HL7090 integrates a synchronous PWM controller, power MOSFET, input current sensing, high-accuracy current and voltage regulation, and charge termination function into a tiny QFN package. Dampers are acoustic cloth screens for insertion inside acoustic tubing. These damping elements are used between the receiver outlet and the ear canal to smoothen the frequency response. Various acoustical resistances and sizes are available.