PMIC - Voltage Regulators - DC DC Switching Regulators

The LM43601QPWPTQ1 is a synchronous, wide input voltage Range, step-down DC-DC converter that delivers up to 7A of Output Current. This application field and working principle of this device make it an ideal choice for a wide range of applications including general purpose high power converters, automotive aftermarket systems, IT, telecom and datacom applications and more. The LM43601QPWPTQ1 utilizes synchronous rectification which allows high efficiency across its input voltage range from 2.7V to 20V. The device also features a high output accuracy of ±1.5% and fast transient response due to its low cycle-to-cycle ripple current.In addition, the LM43601QPWPTQ1 includes several protection features such as over-voltage protection (OVP), current Limit protection (CLP), as well as short-circuit protection (SCP) which protect the device and its components from damage during overload. Furthermore, the device provides external synchronization to simplify synchronization of multiple converters, while its low quiescent current ensures low noise and power efficiency.

Working Principle

The LM43601QPWPTQ1 is a single chip wide input voltage range DC-DC step-down converter that operates in a switching mode. It utilizes a PFM/PWM control scheme in order to achieve very high efficiency across its full load range, ensuring no-load operation for ultra-low standby power consumption. It can regulate a voltage down to 0.8V from an input voltage of up to 20V. The device is available in two versions, one with a fixed output voltage of 5V and the other with an adjustable output voltage.

The LM43601QPWPTQ1 operates in a buck configuration as shown in the schematic below. The high-side MOSFET and the low-side MOSFET are operated under the control of an internal oscillator. The voltage pulses output by the oscillator are the pulses used to drive the upper and lower power MOSFETs alternately. The duty cycle of the pulses is regulated according to the output voltage set by the user, resulting in either phase-shift or pulse width modulation mode of operation.

When the voltage between the input and ground pins increases, the internal oscillator frequency increases and the duty cycle of the output pulses decreases. This results in a decrease in the switching rate of the power MOSFETs, which in turn causes the output voltage to drop. When the voltage between the input and ground pins decreases, the internal oscillator frequency decreases and the duty cycle of the output pulses increases, resulting in an increase in the switching rate of the power MOSFETs and increasing the output voltage.

The LM43601QPWPTQ1 also integrates several protection features to protect the device, input voltage and its supply components from damage due to overload. These include Over-Voltage Protection (OVP) and Current Limit Protection (CLP). OVP will detect if the output voltage exceeds the programmed range and halt the operation of the power MOSFETs. CLP will detect if the output current exceeds the programmed limit and will shut down operation until the fault is cleared.

Applications

The LM43601QPWPTQ1 is widely used in a variety of applications where high-efficiency power conversion is required. The device has a wide input operating range (2.7V-20V) and is therefore suitable for automotive aftermarket applications, consumer electronics systems, portable medical and industrial applications and more.

The LM43601QPWPTQ1 is also suitable for battery-powered applications with its low quiescent current and ultra-low no-load standby power consumption. The device can be synchronized with an external clock to simplify the design and synchronization of multiple converters. Furthermore, the flexibility of the internal oscillator allows for the use of the device in a wide range of applications and environments.

Conclusion

The LM43601QPWPTQ1 is a synchronous, wide input voltage range, step-down DC-DC converter that delivers up to 7A of Output Current. It utilizes synchronous rectification to enable high efficiency operation and features a high output accuracy of ±1.5%. The device also includes several protection features such as over-voltage protection (OVP), current limit protection (CLP), and short-circuit protection (SCP) which protect the device and its components from damage during overload. Its low quiescent current and fast transient response make it suitable for a wide range of applications including automotive aftermarket systems, consumer electronics systems, IT, telecom and datacom applications, industrial and portable medical applications, and more.