LTC3703IGN#PBF

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The LTC3703IGN#PBF is a voltage regulator from the PMIC – Voltage Regulators – DC DC Switching Controllers family. The part offers complete protection against input overvoltage and output short circuit conditions. It also integrates a pair of low on-resistance power MOSFETs for improved efficiency and cost savings in space-constrained applications.

The device is suitable for mobile device applications, such as laptop and notebook computers, tablets, and smartphones, where it offers low quiescent current, wide input voltage range, and fast transient response. When using a dual-phase synchronous buck converter, it can also provide output current up to 400mA.

The LTC3703IGN#PBF incorporates an adjustable operating frequency and selectable current-mode or voltage-mode control, making it suitable for different types of topologies and loads. It also provides separate PGOOD, INV_FAULT, and SW_FAULT status pins for monitoring system status and diagnostics for improved reliability.

The part is controlled by an on-chip integrated 6-bit digital-to-analog converter (DAC), which provides the input reference voltage for the error amplifier and the external transconductance amplifier. This ensures fast transient response and allows for precision voltage setting. The external transconductance amplifier can also be used to sense the output current and provide current-mode control, while the input voltage can be monitored using the internal current sensing circuit.

The on-chip voltage comparator monitors the output voltage and activates a power management control logic (PMCL) mode when the output voltage exceeds the desired voltage. In this mode, the current-mode control is disabled and the PGOOD output goes low. This prevents any additional power dissipation and increases system efficiency.

The LTC3703IGN#PBF is also equipped with an open load detection circuit, which is used to detect an open load condition. The open load detection circuit compares the input voltage with the output voltage and if the two differ by more than the predetermined threshold, the system is determined to be in an open load condition and the device enters the power management control logic mode.

In addition, the device provides a soft-start mode, which is used to reduce output voltage overshoot. The soft-start mode is achieved by configuring the on-chip 6-bit digital-to-analog converter and the external transconductance amplifier, which limits the output current ramp rate. The soft-start mode prevents any excessive output current, thus providing improved system stability and enhanced system safety.

The LTC3703IGN#PBF is designed to operate in an open loop configuration, which requires no external compensation components. This simplifies the design and reduces the number of components needed. Moreover, the device features a phase-locked loop (PLL), which is used to maintain phase accuracy and reduce EMI and RFI noise. This ensures improved system performance and higher EMI immunity.

The LTC3703IGN#PBF is a highly efficient voltage controller, providing a fully programmable output voltage and allowing for fast transient response and superior system stability. With its wide input voltage range, selectable current or voltage control modes, and integrated current sensing and open-load detection circuitry, the part is an ideal solution for mobile device applications, such as laptop and notebook computers, tablets, and smartphones.

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