LTC3642IDD#PBF

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The LTC3642IDD#PBF belongs to the full-featured DC/DC switching regulator family of power management integrated circuit (PMIC) – Voltage Regulators – DC DC Switching Regulators. It is an ideal choice for applications, requiring efficient low power dc-dc energy conversion.

The LTC3642IDD#PBF is a member of the LTC3600 series, integrating a buck switching regulator and a low dropout (LDO) regulator. The buck regulator can be operated in either normal or Burst Mode of operation, offering excellent efficiency and high output current. The internal (internal to controller) secondary-side synchronous rectifier reduces power loss, increases power supply transient response, and allows higher power density.

The regulator output voltage range is from 0.8V to 5.5V and the toggle frequency is adjustable from 50kHz to 550kHz. This wide input voltage range coupled with the adjustable frequency makes the switch regulator ideal for a variety of battery powered and portable applications. The maximum output current of LTC3642IDD#PBF is 8A.

The Working Principle of LTC3642IDD#PBF

The internal table based adaptive on-time control ensures the quickest possible transition to the next steady-state when a load transient is applied. The input voltage is sensed and compared to an internal reference. The current in the Buck regulator source is monitored and compared to a second reference. If the voltage input falls below the lower level of the reference, the regulated output will be shutoff. The internal high speed comparator monitors the output voltage and trips off the internal MOSFETs in order to maintain regulation.

The LTC3642IDD#PBF incorporates an internal error amplifier, a voltage reference, and a current limit comparator to lead its power management capabilities. The error amplifier senses the output voltage and compares it with an internal reference in order to maintain a regulated output. It then uses an PWL (Pulse Width Limiting) DAC to control the switching frequency which affects the input and output current waveforms. The frequency is adjusted in order to maintain the desired output voltage.

The internal voltage reference is a bandgap voltage reference which is used to provide a stable and accurate output voltage. For this chip, the reference voltage generated is typically 1.2V. The current limit comparator monitors the amount of current passing through the inductor and will shut the circuit off if the current exceeds the maximum limit. This allows the chip to maintain a safe operating temperature in high current applications.

The LTC3642IDD#PBF integrates a low dropout (LDO) regulator as well. It is designed to provide a low dropout voltage, allowing for improved efficiency at light loads. The LDO consists of an error amplifier, a voltage reference, and a linear current limiter. The error amplifier senses the output voltage and compares it to an internal reference in order to maintain a regulated output. It then uses a PWL DAC to adjust the load current in order to maintain a regulated output.

In summary, the LTC3642IDD#PBF is a full-featured DC/DC switching regulator and LDO regulator which allows for efficient low power dc-dc energy conversion. The internal error amplifier, voltage reference, and current limit comparator provide excellent power management capabilities. The wide input voltage range and adjustable frequency make this chip an ideal choice for high current battery powered applications.

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