LT3433IFE#PBF

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The Application Field and Working Principle of LT3433IFE#PBF

LT3433IFE#PBF is a monolithic dual-output step-down converter with 100mA low-side switch. It is classified as a DC DC switching regulator under PMIC - Voltage Regulators.

It provides a complete solution for powering digital and analog load from single-cell Li-Ion battery or from wall adapter. It features high efficiency, a wide input voltage range, and is ideal for any portable application. Additionally, its asynchronous switching allows for the inductors and caps to be matched to optimize cost and performance.

Features

• Input Voltage Range of 2.4V to 6.5V
• Dual Output Voltages of 1.2V and 2.5V
• Typical Efficiency of 96% with 0.7V Input and 1.2V Output
• External Bias Voltage Generations
• Integrated 100mA N-Channel Low-Side Switch
• Frequency Adjustment
• Soft-Start and Foldback Regulation
• Stability Enhancer
• Current Limit and Short-Circuit Protection

Application Field

The LT3433IFE#PBF is widely used in a variety of applications such as handheld appliances, battery powered systems, portable entertainment systems and smart phones. It features a wide input range and high efficiency which makes it ideal for any portable application.

Working Principle

The LT3433IFE#PBF is a monolithic dual-output step-down converter with a 100mA low-side switch. It provides a complete solution for powering digital and analog load from single-cell Li-Ion battery or from wall adapter. The device features synchronous rectification for high efficiency and an asynchronous switching so that the inductors and capacitors can be matched to optimize cost and performance.

The device is a constant-frequency, peak current mode device with an adjustable switching frequency of 100 kHz to 2.25 MHz using an external resistor. The switching frequency is managed by a frequency control loop that also adjusts soft start and foldback regulation, as well as over-current and short-circuit protections. Its precision voltage regulation is obtained by using a bandgap reference and an internal error amplifier. The voltage levels are accurately regulated by two pulse-width modulators, enabling two external NFETs, in the low- side configuration, for asynchronous switching.

The output voltage is provided by an integrated complete power stage, with a low resistance NFET providing a supply current of up to 100mA. Additionally, external components can be used to further optimize the output voltage. The short-circuit and over-current protection is done by sensing the current flowing in the inductor. The feed-forward control loop monitors the voltage at the output for accurate regulation.

Overall, the LT3433IFE#PBF provides flexible and efficient power regulation for portable applications. Its wide input range, high efficiency, and integrated low-side switch make it an ideal choice for any portable application.

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