ISL6549IRZ

Voltage/Current - Output 3:	--
Base Part Number:	ISL6549
Supplier Device Package:	16-QFN (4x4)
Package / Case:	16-VQFN Exposed Pad
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 85°C
Voltage - Supply:	4.75 V ~ 5.25 V
w/Sequencer:	No
w/Supervisor:	No
w/LED Driver:	No
Series:	--
Voltage/Current - Output 2:	Controller
Voltage/Current - Output 1:	Controller
Frequency - Switching:	150kHz ~ 1MHz
Number of Outputs:	2
Function:	Any Function
Topology:	Step-Down (Buck) Synchronous (1), Linear (LDO) (1)
Part Status:	Obsolete
Packaging:	Tube

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The ISL6549IRZ is a voltage regulator integrated circuit (IC) specifically designed for Voltage Regulators – Linear + Switching applications that requires low noise, low quiescent current and high efficiency. The device is designed to provide positive and negative adjustable voltage outputs with-respect-to a single battery or divided and multi-battery supply sources.

Features

• Integrated Boost Charger
• Multi-Phase Architecture
• Short Circuit Protection
• Under-Voltage Lockout
• Adjustable Output Voltage
• Quiescent Current of 9.25mA
• Low Output Noise 0.02 μV RMS
• Output Voltage Range: 2.5V to 28V
• High Efficiency up to 95.5%

Applications

The ISL6549IRZ, due to its features, has wide range of industrial and consumer applications such as:

• Portable Battery Charger
• Battery-powered Equipment
• Multi-Phase Switching Regulators
• Distributed Power Applications
• Power-on Reset (POR)
• Low Noise, Low Voltage Regulation

Working Principle

The ISL6549IRZ is designed with a multi-phase architecture that consists of two integrated direct-FET buck switches. Each buck switch provides a regulated output voltage based on its corresponding control voltage. The two buck switches operate in 180 degree out-of-phase and together present a constant on time, variable off time architecture, providing high efficiency and low output voltage ripple.The ISL6549IRZ features a built in boost charger which can increase the charge current when the battery voltage is low and can support as much as 3.2A output current. The boost charger also contains an over voltage protection circuit.The under-voltage lockout circuit prevents the buck outputs from turning on if the input voltage is too low. The device also features a power-on reset circuit that can be used to protect the device from latch-up or invalid logic states during system startup and wake-up from low voltage conditions.The ISL6549IRZ also has other important features such as soft-start that helps reduce inrush current and adjustable output voltage, enabling the design of power supply solutions with desired output voltage. All these features make it ideal for low noise and low quiescent current applications.

Conclusion

The ISL6549IRZ voltage regulator is designed to provide low noise, low quiescent current and high efficiency in voltage regulator applications that require positive and negative adjustable voltage outputs. The multi-phase architecture together with the integrated boost charger, protection and adjustable output voltage functions, makes the ISL6549IRZ suitable for a wide range of industrial and consumer applications, from portable battery charging to multi-phase switching regulators.

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