参数资料
| 型号： | ISL6225CAZA-T |
| 厂商： | Intersil |
| 文件页数： | 1/19页 |
| 文件大小： | 0K |
| 描述： | IC CTRLR DDR DRAM, SDRAM 28QSOP |
| 标准包装： | 2,500 |
| 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： | 带卷 (TR) |
W DESIG
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Data Sheet 539
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ISL6227
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December 28, 2004
ISL6225
FN9049.7
Dual Mobile-Friendly PWM Controller with
DDR Memory Option
The ISL6225 dual PWM controller delivers high efficiency and
tight regulation from two voltage regulating synchronous buck
DC/DC converters. The ISL6225 PWM power supply controller
was designed especially for DDR DRAM, SDRAM, and graphic
chipset applications in high performance desknote PCs,
notebook PCs, sub-notebook PCs, and PDAs.
Automatic mode selection of constant-frequency synchronous
rectification at heavy load, and hysteretic diode-emulation at
light load, assure high efficiency over a wide range of
conditions. The hysteretic mode of operation can be disabled
separately on each PWM converter if constant-frequency
continuous-conduction operation is desired for all load levels.
Efficiency is further enhanced by using the lower MOSFET
r DS(ON) as the current sense element.
Voltage-feed-forward ramp modulation, average current mode
control, and internal feedback compensation provide fast
response to input voltage and output load transients. Input
current ripple is minimized by channel to channel PWM
phase shift of 0°, 90°, or 180° determined by input voltage
and status of the DDR pin.
The ISL6225 can control two independent output voltages
adjustable from 0.9V to 5.5V or, by activating the DDR pin,
transform into a complete DDR memory power supply
solution. In DDR mode, CH2 output voltage VTT tracks CH1
output voltage VDDQ. CH2 output can both source and sink
current, an essential power supply feature for DDR memory
systems. The reference voltage VREF required by DDR
memory is generated as well.
In dual power supply applications the ISL6225 monitors the
output voltage of both CH1 and CH2. An independent
PGOOD (power good) signal is asserted for each channel
after the soft-start sequence has completed, and the output
voltage is within ±10% of the set point. In DDR mode CH1
generates the only PGOOD signal.
Features
? Provides regulated output voltage in the range of 0.9V-5.5V
- High efficiency over wide load range
- Synchronous buck converter with hysteretic operation at
light load
- Inhibit Hysteretic mode on one, or both channels
? Complete DDR memory power solution
- VTT tracks VDDQ/2
- VDDQ/2 buffered reference output
? No current-sense resistor required
- Uses MOSFET r DS(ON)
- Optional current-sense resistor for precision overcurrent
? Under-voltage lock-out on V CC pin
? Dual input voltage mode operation
- Operates directly from battery 5V to 24V input
- Operates from 3.3V or 5V system rail
- VCC from 5V only
? Excellent dynamic response
- Combined voltage feed-forward and average current
mode control
? Power-good signal for each channel
? 300kHz switching frequency
- 180° channel to channel phase operation for reduced input
ripple when not in DDR mode
- 0° channel to channel phase operation in DDR mode for
reduced channel interference
- 90° channel to channel phase operation for reduced input
ripple in DDR mode when VIN is at GND.
? Pb-Free Available (RoHS Compliant)
Applications
? Mobile PCs
? PDAs
? Hand-held portable instruments
Ordering Information
Built-in overvoltage protection prevents the output from
going above 115% of the set point by holding the lower
PART NUMBER
TEMP. (°C)
PACKAGE
PKG.
DWG. #
MOSFET on and the upper MOSFET off. When the output
voltage decays below the overvoltage threshold, normal
operation automatically resumes. Once the soft-start
sequence has completed, under-voltage protection may
latch the ISL6225 off if either output drops below 75% of its
set point value.
Adjustable overcurrent protection (OCP) monitors the
voltage drop across the r DS(ON) of the lower MOSFET. If
more precise current-sensing is required, an external current
sense resistor may be used.
ISL6225CA -10 to 85 28 Ld SSOP M28.15
ISL6225CAZ (Note 1) -10 to 85 28 Ld SSOP (Pb-free) M28.15
ISL6225CAZA (Note 1) -10 to 85 28 Ld SSOP (Pb-free) M28.15
NOTES:
1. Intersil Pb-free 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.
2. Add “-T” for Tape and Reel.
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 321-724-7143 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright ? Intersil Americas Inc. 2002-2004. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
| ISL6227 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:Dual Mobile-Friendly PWM Controller with DDR Option |
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