ISL8843MBZ-T

Frequency - Switching:	Up to 2MHz
Base Part Number:	ISL8843
Supplier Device Package:	8-SOIC
Package / Case:	8-SOIC (0.154", 3.90mm Width)
Operating Temperature:	-55°C ~ 125°C (TJ)
Control Features:	Current Limit, Frequency Control
Serial Interfaces:	--
Clock Sync:	No
Synchronous Rectifier:	No
Duty Cycle (Max):	95%
Series:	--
Voltage - Supply (Vcc/Vdd):	9 V ~ 30 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:	Active
Packaging:	Tape & Reel (TR)

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Introduction

The ISL8843MBZ-T is an advanced DC-DC switching controller designed for high voltage buck regulators and DC-DC converters. The device integrates a 10V/20V power MOSFET, as well as a buck regulator with a wide range of feedback voltage options and current sense gain settings. It also includes unique features such as output voltage monitoring, power-on reset and additional external control inputs to enable complex power designs. It is available in a small Pb-free 8-lead TDFN package. This article will focus on the application field and working principle of the ISL8843MBZ-T.

Application Field

The ISL8843MBZ-T DC-DC switching controller can be used in a wide range of applications, including but not limited to: power conversion for networking equipment, server/data center applications, automotive/industrial, consumer and medical products. The device is ideal for high efficiency point of load (POL) and intermediate bus voltage regulation, providing excellent line and load regulation, high power efficiency and low noise operation.The ISL8843MBZ-T is suitable for powering voltage ranges from 3V to 20V. It has a wide range of feedback voltage options and current sense gain settings, enabling high precision control of the output voltage. The integrated 10V/20V power MOSFET eliminates the need for external high voltage components, simplifying design and layout. Additionally, the device includes dynamic phase skipping and accurate real-time current measurement to optimize efficiency and minimize size and complexity of the design.

Working Principle

The ISL8843MBZ-T uses an Error Amplifier, a high-gain amplifier to compare the output voltage to the feedback voltage. The resulting error signal drives the Rising Edge Switch. This switch is a power MOSFET with a high drain-to-source voltage rating of 10V/20V, which is integrated in the package.Once the switch is activated, the duty cycle can be adjusted to give the desired output voltage. The duty cycle is controlled by a current-mode Proportional-Integral (P-I) control loop. This loop uses PID (Proportional-Integral-Derivative) control to minimize the output voltage error and minimize current ripple.The ISL8843MBZ-T also includes several integrated protection features that prevent damage to the device in the event of a fault or an overcurrent or overvoltage condition. These include thermal shutdown, undervoltage lockout, brown-out protection, overcurrent and overvoltage protection, and power-on reset.

Conclusion

The ISL8843MBZ-T is an advanced DC-DC switching controller designed for high voltage buck regulators and DC-DC converters. It is suitable for powering voltage ranges from 3V to 20V, making it ideal for high efficiency point of load (POL) and intermediate bus voltage regulation applications. The device integrates a 10V/20V power MOSFET, as well as a buck regulator with a wide range of feedback voltage options and current sense gain settings, enabling high precision control of the output voltage. Additionally, the device includes several integrated protection features to ensure safe operation.

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