参数资料
| 型号： | ISL6225CAZA |
| 厂商： | Intersil |
| 文件页数： | 13/19页 |
| 文件大小： | 0K |
| 描述： | IC CTRLR DDR DRAM, SDRAM 28QSOP |
| 标准包装： | 480 |
| 应用： | 控制器，DDR DRAM，SDRAM |
| 输入电压： | 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： | 管件 |
ISL6225
This makes out-of-phase channel synchronization
undesirable when one of the channels is running on a duty-
factor of 50%. Inversely, the in-phase channel arrangement
does not have this drawback. Points of decision are far from
noisy moments of time in both sourcing and sinking modes
of operation for V IN = 7.5V to 24V as it is shown in Figure 9.
In the case when power for VDDQ is taken from the +5V
system rail, as Figure 10 shows, both in-phase and out-of-
phase approaches are susceptible to noise in the sourcing
mode.
300kHz CLOCK
VDDQ
SOURCING
Several ways of synchronization are implemented into the
chip. When the DDR pin is connected to GND, the channels
operate 180 o out-of-phase. In the DDR mode when the DDR
pin is connected to V CC , the channels operate either in-
phase when the V IN pin is connected to the input voltage
source, or with 90 o phase shift if the VIN pin is connected to
GND.
ISL6225 DC-DC Converter Application
Circuits
Figures 11 and 12 show application circuits of a dual channel
DC/DC converter for a notebook PC.
The power supply in Figure 11 provides +2.5V and +1.8V for
memory and graphic interface chipset from +5.0V to +24V
battery voltage.
Figure 12 shows the power supply that provides +2.5V and
VTT
SINKING
SOURCING
VTT
OUT-OF-PHASE
IN-PHASE
+1.8V for memory and graphic interface chipset from +5.0V
system rail.
Figure 13 shows an application circuit for a single-output
split input power supply with current sharing for advanced
graphic card applications.
Figure 14 and 15 show application circuits of a complete
power solution for DDR memory that becomes a preferred
SINKING
FIGURE 9. CHANNEL INTERFERENCE V IN = 7.5V...24V
Noise immunity can be improved by operating the VTT
converter with a 90 o phase shift. As the time diagrams in
Figure 10 show, the points of concern are always about a
quarter of the period away from the noise emitting
transitions.
300kHz CLOCK
choice in modern computers. The power supply shown in
Figure 14 generates +2.5V VDDQ voltage from +5.0V to
+24V battery voltage. The +1.25V VTT termination voltage
tracks VDDQ/2 and is derived from +2.5V VDDQ. To
complete the DDR memory power requirements, the +1.25V
reference voltage is also provided. The PG2 pin serves as
an output for the reference voltage in this mode.
Figure 15 depicts the DDR solution in the case where the 5V
system rail is used as a primary voltage source.
For detailed information on the circuit, including a Bill-of-
VDDQ
SOURCING
VTT
SINKING
SOURCING
VTT
SINKING
SOURCING
VTT
OUT-OF-PHASE
IN-PHASE
90 o PHASE SHIFT
Materials and circuit board description, see Application Note
AN9995. Also see Intersil’s web site (http://www.intersil.com)
for the latest information.
SINKING
FIGURE 10. CHANNEL INTERFERENCE V IN = 5V
13
FN9049.7
December 28, 2004
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相关代理商/技术参数 |
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| ISL6225CAZA-T | 功能描述:电流型 PWM 控制器 W/ANNEAL DL SWITCHER W/DRR OPTION 30V RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| ISL6225CAZ-T | 功能描述:IC CTRLR DDR DRAM, SDRAM 28QSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:43 系列:- 应用:控制器，Intel VR11 输入电压:5 V ~ 12 V 输出数:1 输出电压:0.5 V ~ 1.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:48-VFQFN 裸露焊盘 供应商设备封装:48-QFN（7x7） 包装:管件 |
| ISL6226 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:Advanced PWM and Linear Power Controller for Portable Applications |
| ISL6226CA | 制造商:Rochester Electronics LLC 功能描述:- Bulk 制造商:Intersil Corporation 功能描述: |
| ISL6226EVAL1 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:Advanced PWM and Linear Power Controller for Portable Applications |
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