Intersil ISL9440BIRZ-T

降压同步（3），线性（LDO）（1）4控制器4.5V ~ 24V

Overview

The ISL9440, ISL9440A and ISL9441 are quad-output synchronous buck controllers that integrate 3 PWM controllers and 1 low drop-out linear regulator controller, which are full featured and designed to provide multi-rail power for use in products such as cable and satellite set-top boxes, VoIP gateways, cable modems, and other home connectivity products as well as a variety of industrial and general purpose applications. Each output is adjustable down to 0.8V. The PWMs are synchronized at 180° out of phase thus reducing the RMS input current and ripple voltage. The ISL9440, ISL9440A and ISL9441 offer internal soft-start, independent enable inputs for ease of supply rail sequencing, and integrated UV/OV/OC/OT protections in a space conscious 5mmx5mm QFN package. The ISL9440BIRZ and ISL9440A offers an early warning function to output a logic signal to warn the system to back up data when the input voltage falls below a certain level. The ISL9440, ISL9440A and ISL9441 are utilize internal loop compensation to keep minimum peripheral components for compact design and a low total solution cost. These devices are implemented with current mode control with feed forward to cover various applications even with fixed internal compensations.The table below shows the difference in terms of ISL9440, ISL9440A and ISL9441 features. PART NUMBER EARLY WARNING SWITCHING FREQUENCY (kHz) ISL9440BIRZ YES 300 ISL9440A YES 600 ISL9441 NO 300

Features

Tape & Reel (TR) Package
4 outputs
Peak Reflow Temperature: 260
ALSO OPERATES AS LDO REGULATOR

Surface Mount Mounting Type

Applications

There are a lot of Intersil (Renesas Electronics America)
ISL9440BIRZ-T Linear Regulator Controllers applications.

• Low parts count 5.0V to 3.3V computer supply
• Low noise SMPS post regulator
• Low-dropout SMPS post regulator
• High-current, current-limited switch
• Dual/Triple Power Supplies
• Desknotes and Notebooks
• Graphic Cards
• Ultra-Low-Dropout
• Voltage Regulators
• Low-Voltage DSP Power Supplies