参数资料
| 型号： | ISL6444CAZ-T |
| 厂商： | Intersil |
| 文件页数： | 1/19页 |
| 文件大小： | 0K |
| 描述： | IC CONTROLLER DDR 28-QSOP |
| 标准包装： | 2,500 |
| 应用： | 控制器，DDR |
| 输入电压： | 4.5 V ~ 24 V |
| 输出数： | 2 |
| 输出电压： | 0.9 V ~ 5.5 V |
| 工作温度： | -10°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-SSOP（0.154"，3.90mm 宽） |
| 供应商设备封装： | 28-SSOP/QSOP |
| 包装： | 带卷 (TR) |
?
ISL6444
Data Sheet
April 12, 2007
FN9069.3
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.
Synchronous rectification and hysteretic operation at light
loads contribute to a high efficiency over a wide range of
loads. The hysteretic mode of operation can be disabled
separately on each PWM converter if continuous conduction
operation is desired for all load levels. Efficiency is even
further enhanced by using MOSFET’s r DS(ON) as a current
sense component.
Feed-forward ramp modulation, current mode control
scheme, and internal feed-back compensation provide fast
response to load transients. Out-of-phase operation with a
180 o phase shift reduces the input current ripple.
The controller can be transformed in a complete DDR
memory power supply solution by activating a DDR pin. In
DDR mode of operation one of the channels tracks the
output voltage of another channel and provides output
current sink and source capability–features essential for
proper powering of DDR chips. The buffered reference
voltage required by this type of memory is also provided.
The ISL6444 monitors the output voltages. Each PWM
controller generates a PGOOD (power good) signal when
the soft-start is completed and the output is within ±10% of
the set point.
A built-in overvoltage protection prevents output voltage
from going above 115% of the set point. Normal operation
automatically restores when the overvoltage conditions go
away. Undervoltage protection latches the chip off when
either output drops below 75% of its set value after the
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 r DS(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
Ordering Information
soft-start sequence for this output is completed. An
adjustable overcurrent function monitors the output current
PART
PART
TEMP.
RANGE
PKG.
by sensing the voltage drop across the lower MOSFET. If
NUMBER
MARKING
(°C)
PACKAGE
DWG. #
precision current-sensing is required, an external current-
sense resistor may optionally be used.
ISL6444CA*
ISL 6444CA
-10 to +85 28 Ld QSOP M28.15
ISL6444CAZ* ISL 6444CAZ -10 to +85 28 Ld QSOP M28.15
The IC comes in a 28 Ld SSOP package.
(Note)
(Pb-free)
*Add “-T” suffix for tape and reel.
NOTE: Intersil Pb-free plus anneal products employ special Pb-free
material sets; molding compounds/die attach materials and 100%
matte tin plate termination finish, which are RoHS compliant and
compatible with both SnPb and Pb-free soldering operations. Intersil
Pb-free products are MSL classified at Pb-free peak reflow
temperatures that meet or exceed the Pb-free requirements of
IPC/JEDEC J STD-020.
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright ? Intersil Americas Inc. 2002, 2006, 2007. All Rights Reserved
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ISL6445EVAL3Z | 功能描述:EVALUATION BOARD FOR ISL6445 RoHS:是 类别:编程器，开发系统 >> 评估板 - DC/DC 与 AC/DC（离线）SMPS 系列:- 产品培训模块:Obsolescence Mitigation Program 标准包装:1 系列:True Shutdown™ 主要目的:DC/DC，步升 输出及类型:1，非隔离 功率 - 输出:- 输出电压:- 电流 - 输出:1A 输入电压:2.5 V ~ 5.5 V 稳压器拓扑结构:升压 频率 - 开关:3MHz 板类型:完全填充 已供物品:板 已用 IC / 零件:MAX8969 |
| ISL6445IAZ | 功能描述:IC REG CTRLR BUCK PWM CM 24-QSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:275kHz 占空比:50% 电源电压:18 V ~ 110 V 降压:无 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:是 工作温度:-40°C ~ 85°C 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 包装:带卷 (TR) |
| ISL6445IAZS2695 | 制造商:Intersil Corporation 功能描述: |
| ISL6445IAZ-TK | 功能描述:IC REG CTRLR BUCK PWM CM 24-QSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:275kHz 占空比:50% 电源电压:18 V ~ 110 V 降压:无 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:是 工作温度:-40°C ~ 85°C 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 包装:带卷 (TR) |
| ISL6445IAZ-TKS2645 | 制造商:Intersil Corporation 功能描述:DC DC CNTRLR DUAL-OUT STEP DOWN 4.5V TO 24V 24QSOP W - Tape and Reel |
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