Dual PWM Controller with DDR Memory Option for Gateway Applications

The ISL6444 PWM controller provides high efficiency and regulation for two output voltages adjustable in the range from 0.9V to 5.5V that are required to power I/O, chip-sets, and memory banks in high-performance notebook computers, PDAs, and Internet appliances.

Features

? Provides regulated output voltage in the range 0.9V to 5.5V

- High efficiency over wide load range

- Synchronous buck converter with hysteretic operation at light load

? Complete DDR memory power solution

- VTT tracks VDDQ/2

- VDDQ/2 buffered reference output

? No current-sense resistor required

- Uses MOSFET’s rDS(ON)

- Optional current-sense resistor for precision overcurrent

? Undervoltage lock-out on VCC pin

? Dual mode operation

- Operates directly from battery 5.0V to 24V input

- Operates from 3.3V or 5V system rail

? Excellent dynamic response

- Combined voltage feed-forward and current mode control

? Power-good signal for each channel

? 300kHz switching frequency

- Out-of-phase operation for reduced input ripple

- In-phase operation in DDR mode for reduced channel interference

- Out-of-phase operation with 90° phase shift for two-stage conversion in DDR mode

? Pb-free plus anneal available (RoHS compliant)

Applications

? Residential and Enterprise Gateways

? DSL Modems

? Routers and Switchers

ISL6444CA屬于集成電路（IC） > 特殊用途穩(wěn)壓器。瑞薩科技有限公司制造生產(chǎn)的ISL6444CA特殊用途穩(wěn)壓器該系列產(chǎn)品用于電源控制、某種形式的轉(zhuǎn)換，適用于特定的復(fù)雜應(yīng)用。因此，各種產(chǎn)品特性集差異較大，包括空燃比傳感器接口、汽車交流發(fā)電機電壓調(diào)節(jié)、DDR 端接、液體透鏡控制、摩托車轉(zhuǎn)向信號控制、熱電 (peltier) 冷卻器控制、壓電觸覺控制、閥門控制、小型發(fā)動機管理等。