ISL9305IRTHWCNYZ-T7A

Voltage/Current - Output 3:	3.3V, 300mA
Base Part Number:	ISL9305
Supplier Device Package:	16-TQFN (4x4)
Package / Case:	16-WQFN Exposed Pad
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 85°C
Voltage - Supply:	1.5 V ~ 5.5 V
w/Sequencer:	No
w/Supervisor:	No
w/LED Driver:	No
Series:	--
Voltage/Current - Output 2:	1.8V, 1.5A
Voltage/Current - Output 1:	1.2V, 1.5A
Frequency - Switching:	3MHz
Number of Outputs:	4
Function:	Any Function
Topology:	Step-Down (Buck) (2), Linear (LDO) (2)
Part Status:	Active
Packaging:	Tape & Reel (TR)

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Introduction

The ISL9305IRTHWCNYZ-T7A is an adjustable, high-efficiency, high-current linear and switching power management integrated circuit (PMIC) used for voltage regulation in a wide range of consumer and industrial products. Specifically designed for applications that require high switching speed and low losses, the ISL9305IRTHWCNYZ-T7A can provide a stable voltage rail while minimizing current consumption and heat dissipation. The IC combines an adjustable switching regulator and two adjustable low dropout (LDO) linear regulators in a single package, allowing for greater design flexibility and the ability to power multiple components with one solution. In addition, the ISL9305IRTHWCNYZ-T7A includes a circuit protection feature that limits the maximum output current of the converters and LDOs to ensure system reliability and safety.

Application Field

The ISL9305IRTHWCNYZ-T7A is well-suited for powering small, portable consumer and industrial systems. Its adjustable switching regulator and two adjustable LDOs can provide multiple voltage rails with a wide range of output voltages and current levels, making it suitable for powering microcontrollers, system-on-chips (SoCs), displays, onboard memory, disk drives, sensors, and other power-consuming components. Additionally, the low dropout and high efficiency of the ISL9305IRTHWCNYZ-T7A make it ideal for powering systems where battery life is paramount, such as medical and remote monitoring systems, hand-held instruments, and wireless communication communicating devices.

Working Principle

The ISL9305IRTHWCNYZ-T7A is a combination of a switching regulator and two adjustable low dropout (LDO) linear regulators. The switching regulator works by alternately storing and releasing electrical energy to create a steady voltage output that is much more efficient than a linear regulator. The switching regulator consists of a power stage, current limit, control logic, compensation, frequency setting and an enable circuit. The power stage consists of the main switch, power diode, inductor, and output capacitor. The current limit circuit is used to protect the IC from over-current conditions and prevent damage to the power components. The control logic monitors the output voltage and adjusts the frequency of the switching cycle to maintain the voltage output. The compensation circuit is used to stabilize the current loop and ensure the voltage output is maintained as desired. The enable circuit allows the IC to be turned on and off.At the same time, two adjustable LDOs maintain the programmed voltage outputs by operating with a minimum output current of 1mA and a maximum of 300 mA. Each LDO consists of a power stage, current limit, control logic, comparator, and enable circuit. The power stage includes an error amplifier, pass transistor, and output capacitor. The current limit circuit monitors the output current and limits the maximum current to prevent over-current conditions. The control logic monitors the output voltage and adjusts the transconductance of the error amplifier to maintain the voltage output. The comparator boots the enable circuit and turns the LDO on and off.

Conclusion

The ISL9305IRTHWCNYZ-T7A is a highly efficient and adjustable linear and switching power management integrated circuit (PMIC). It consists of an adjustable switching regulator and two adjustable LDOs in a single package, enabling it to provide multiple voltage rails with a wide range of output voltages and current levels. Additionally, the IC includes a circuit protection feature that limits the maximum output current of the converters and LDOs to ensure system reliability and safety. The ISL9305IRTHWCNYZ-T7A is therefore well-suited for powering small, portable consumer and industrial systems, with applications in medical and remote monitoring systems, hand-held instruments, and wireless communication devices.

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