LTC3103EMSE#TRPBF Integrated Circuits (ICs)

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The LTC3103EMSE#TRPBF is a highly efficient, 4V to 17V input, synchronous monolithic buck-boost DC/DC switching regulator. With its wide input range and simple output programming, this switching regulator is well suited for a variety of power-supply applications. The LTC3103EMSE#TRPBF also integrates low-battery and over-temperature protection, as well as optional soft-start and pre-regulation. To meet the demands of battery-powered applications, this regulator can be configured to achieve high efficiency at light load conditions and power gating in sub-µA shutdown mode.

Application Field of LTC3103EMSE#TRPBF

The LTC3103EMSE#TRPBF is a high-efficiency synchronous buck-boost switching regulator that is ideal for a variety of applications, such as wearable and portable electronic systems, battery-powered and hand-held instruments, and industrial and medical measurement and control systems. In such applications, the LTC3103EMSE#TRPBF offers the following advantages:

• Wide 2.2V to 17V input voltage range
• High efficiency over entire load range: 91% at 3V out, 90% at 5V out, and 88% at 9V out
• Configurable forced PWM operation at light load
• Power gating with programmable soft-start and pre-regulation
• Overload and over-temperature protection

Working Principle of LTC3103EMSE#TRPBF

LTC3103EMSE#TRPBF uses an advanced buck-boost architecture operating in either buck or boost mode to achieve high efficiency over the entire input-to-output range. The switching regulator utilizes a high-frequency power-train composed of a pair of N- and P-channel power MOSFETs, operated in complementary fashion to achieve high efficiency even for very low power levels. The power train control is based on a current mode control scheme, with a fixed frequency modulation and regulation feedback loop.

An external 0.1µF capacitor is used to block the input voltage and to provide a slow start up, while the output is regulated by a sense FET connected to the grounded output terminal. This connection provides a current-sense feedback and introduces temperature compensation. During operation, the output voltage is sensed and compared to an internal reference voltage. The resulting error voltage is amplified and then used to modulate the switching frequency by controlling the PWM signal.

The LTC3103EMSE#TRPBF also includes an integrated low-battery monitoring circuit. This circuit senses the output voltage and activates the LOBAT (Low Battery Output) signal when the output voltage is below a 1.1V set point. This signal is then used to activate any external circuit warning the user when the battery is running low. Moreover, the output of the regulator is protected against overloads and over-temperature conditions that can potentially damage the system.

Conclusion

The LTC3103EMSE#TRPBF is a highly efficient, synchronous buck-boost switching regulator powering wide input range, capable of realizing high efficiency for very low power levels, with robust protection features such as low-battery and over-temperature protection, as well as optional soft-start and pre-regulation. It is ideal for applications such as wearable and portable electronic systems, battery-powered and hand-held instruments, and industrial and medical measurement and control systems.

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