CP2128 white LED driver circuit

The CP2128 is a low-noise, fixed-frequency step-up DC/DC converter designed for garden applications. It operates within an input voltage range of 2.7V to 4.5V and can generate a stable output voltage of 5V, with a maximum output current of 100mA. The CP2128 requires minimal external components, making it ideal for small, battery-operated source applications. The charge pump output of the CP2128 minimizes voltage fluctuations, maintaining stability from full load to no load. Additionally, the CP2128 features thermal protection and can sustain continuous output to ground. Its high switching frequency allows for the use of small ceramic capacitors.

Key technical characteristics of the CP2128 include low noise operation, a fixed output current of 100mA, a switching frequency of 1.8MHz, a fixed output voltage of 5V (±4%), an input voltage range of 2.7V to 4.5V, automatic soft-start to mitigate inrush current, no inductance, and a shutdown current (Icc) of less than 1µA.

Typical applications for the CP2128 include mobile phones, digital audio players, MP3 players, PDAs, laptop computers, and GPS receivers. A typical application circuit for the CP2128 is illustrated in the accompanying figure.

The CP2128 DC/DC converter is designed to efficiently step up lower input voltages to a higher output voltage while maintaining low noise and high reliability. The device's charge pump architecture eliminates the need for inductors, simplifying the design and reducing the overall footprint of the circuit. The implementation of a soft-start feature is crucial in preventing excessive current draw during initial power-up, which can otherwise lead to component stress or failure.

In practical applications, the CP2128 can be connected to a variety of energy sources, including lithium-ion and lithium-polymer batteries, which commonly operate within the specified input voltage range. Its ability to deliver a consistent 5V output makes it suitable for powering sensitive electronic components that require stable voltage levels.

The thermal protection feature of the CP2128 ensures that the device operates within safe temperature limits, enhancing the reliability of the circuit in various operating conditions. The high switching frequency of 1.8MHz allows for the use of smaller capacitors, which not only saves space but also improves the transient response of the power supply.

In summary, the CP2128 is a versatile and efficient step-up converter that is well-suited for portable electronic devices, providing a reliable power source while minimizing component count and size. Its design considerations make it an excellent choice for engineers looking to implement a robust and compact power solution in their products.CP2128 is a low noise, fixed frequency step-up garden DC / DC converter, in the case where the input voltage range of 2.7 ~ 4.5V, the device can generate an output voltage of 5V to eat, the maximum output current up to 100MA. C CP2128 few external components, is ideally suited for small, battery-roar as the source applications. CP2128 charge pump output can reduce volatility and input in full load to zero load. CP2128 have thermal protection, can withstand continuous UOUT ground. CP2128 high switching frequency, allowing the use of small ceramic capacitors. Technical characteristics (1) CP2128 of The main technical characteristics are as follows CP2128. O low noise, fixed frequency. Output Current: 100mA. 1.8MHz switching frequency. fixed output voltage of 5 (1 4%) V. input voltage range of 2.7 ~ 4.5V. automatic soft-start to reduce inrush current. no inductance. shutdown Icc <1 A. (2) CP2128 typical application circuit CP2128 application areas: mobile phones, digital sipping player, MP3 player, PDA, laptop computers, GPS receivers. CP2128 typical application circuit is shown in Fig. Typical application circuit of Figure CP2128