ISL6843IU

Frequency - Switching:	Up to 2MHz
Base Part Number:	ISL6843
Supplier Device Package:	8-MSOP
Package / Case:	8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
Operating Temperature:	-40°C ~ 105°C (TA)
Control Features:	Current Limit, Frequency Control
Serial Interfaces:	--
Clock Sync:	No
Synchronous Rectifier:	Yes
Duty Cycle (Max):	96%
Series:	--
Voltage - Supply (Vcc/Vdd):	9 V ~ 16 V
Output Phases:	1
Number of Outputs:	1
Topology:	Boost, Flyback
Output Configuration:	Positive, Isolation Capable
Function:	Step-Up, Step-Up/Step-Down
Output Type:	Transistor Driver
Part Status:	Obsolete
Packaging:	Tube

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ISL6843IU Application Field and Working Principle

PMIC, Voltage Regulators and DC DC Switching controllers are key components in the semiconductor industry. The ISL6843IU is a high efficiency DC-DC controller used to step down a wide range of input voltages. This product can be used in DC operations powered by a main rail input voltage and a wide variety of micro-controllers and FPGAs for low noise, high speed, and low ripple applications. This product has many useful applications in automotive and industrial sectors, as well as in consumer electronics.

Features of ISL6843IU

The ISL6843IU is an integrated, high efficiency DC-DC buck converter that features a wide input voltage range of 8-50V, a low operating quiescent current of 176µA, a wide output voltage range of 0.6-30V, and a high efficiency of up to 90%. The product is designed to provide a regulated output voltage with a minimum dropout voltage of 100mV. Its switching frequency is programmable (150kHz to 2MHz), as is its internal compensation value. The device also includes an on-chip PMOS startup transistor, which allows the system to start soft-off from an input voltage of down to 8V.The ISL6843IU also has an on-chip voltage supervisor undervoltage lockout (UVLO) and overvoltage lockout (OVP). The UVLO feature ensures the device remains operational even at low input voltage levels, while the OVP feature prevents the output from exceeding a predetermined level. In addition, the device is equipped with an adjustable overcurrent protection (OCP) and short-circuit protection.

Application Fields for ISL6843IU

The ISL6843IU is primarily used in automotive applications such as electric and hybrid electric vehicles, as well as in telecommunications, industrial, healthcare, and consumer electronic devices. Due to its high efficiency and wide input voltage range, it is ideal for use in high power applications. For example, it can be used to step down 48V input to 12V output in 48V automotive applications.In addition, the high efficiency and wide voltage input range, coupled with its low operating current and shutdown current, makes the ISL6843IU a suitable choice for battery-supplied applications and battery backup operations. The low operating current ensures high system efficiency and the shutdown current enables the system to be reliable and highly efficient in low power applications, such as cell phones, tablets and other portable electronics.

Working principle of ISL6843IU

The ISL6843IU uses a buck topology to step down a wide range of input voltages. The internal circuitry of the device works in two phases: the pre-regulation phase and the regulation phase. In the pre-regulation phase, the device uses an on-board transistor to perform pre-regulation switching, which helps to ensure low dropout voltage, low jitter and high efficiency at low input voltages. In the regulation phase, the device uses a hysteretic comparator to compare the feedback voltage to a predetermined threshold voltage. The error signal generated by the comparator is then used to control a buck switch, which switches the input voltage to the output. The switching frequency is regulated by an internal oscillator and is adjustable over a wide range. Finally, the device\'s voltage supervisor monitors the input and output voltages to ensure that the system operates safely. It has separate functions for under- and over-voltage protection, and can also be used to implement adjustable over-current protection, short-circuit protection, and soft-off low voltage protection. In summary, the ISL6843IU is a high efficiency DC-DC controller designed to step down a wide range of input voltages. Its wide input and output voltage range, low operating current, high efficiency, and adjustable parameters make it suitable for a variety of automotive, industrial, telecommunications, and consumer electronics applications.

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