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參數資料
| 型號： | ISL88550A |
| 廠商： | Intersil Corporation |
| 英文描述： | Synchronous Step Down Controller with Sourcing and Sinking LDO Regulator |
| 中文描述： | 同步降壓控制器，具有采購和下沉LDO穩壓器 |
| 文件頁數： | 1/25頁 |
| 文件大小： | 928K |
| 代理商： | ISL88550A |
1
FN6168.0
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. 2005. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
ISL88550A
Synchronous Step Down Controller with
Sourcing and Sinking LDO Regulator
ISL88550A integrates a synchronous buck PWM controller
to generate VDDQ, a sourcing and sinking LDO linear
regulator to generate VTT, and a 10mA reference output
buffer to generate VTTR. The buck controller drives two
external N-Channel MOSFETs to generate output voltages
down to 0.7V from a 2V to 25V input with output currents up
to 15A. The LDO can source up to 2.5A and sink up to -2.0A
continuously. Both the LDO output and the 10mA reference
buffer output can be made to track the REFIN voltage via a
built-in resistive divider. These features make the
ISL88550A ideally suited for DDR memory applications in
desktops, notebooks and graphics cards.
The PWM controller in the ISL88550A uses constant-on-time
PWM architecture with a programmable switching frequency
of up to 600kHz. This control scheme handles wide
input/output voltage ratios with ease and provides 100ns
“instant-on” response to load transients while maintaining
high efficiency and a relatively constant switching frequency.
The ISL88550A offers full programmable UVP/OVP and skip
mode options ideal in portable applications. Skip mode
allows for improved efficiency at lighter loads.
The VTT and VTTR outputs track to VREFIN/2. The high
bandwidth of this LDO regulator allows excellent transient
response without the need for bulk capacitors, thus reducing
the cost and size.
The buck controller and LDO regulators are provided with
independent current limits. Adjustable loss-less fold-back
current limit for the buck regulator is achieved by monitoring
the drain-to-source voltage drop of the low side synchronous
MOSFET. Once over-current is removed, the regulator is
allowed to enter soft-start again. This helps minimize power
dissipation during short-circuit condition. Additionally, over-
voltage and under-voltage protection mechanisms are built
in. The ISL88550A allow flexible sequencing and standby
power management using SHDNA#, and STBY# inputs.
Features
Pb-Free Plus Anneal Available (RoHS Compliant)
Buck Controller
Constant-On PWM with 100ns Load-Step Response
Start-up with Pre-biased Output Voltage
Up to 95% Efficiency
2V to 25V Input Voltage Range
1.8V/2.5V Fixed or 0.7V to 3.5V Adjustable Output
200kHz/300kHz/450kHz/600kHz Switching Frequencies
Programmable Current Limit with Foldback Capability
1.7ms Digital Soft-Start and Independent Shutdown
Overvoltage/Undervoltage Protection Option
Power-Good Window Comparator
LDO Section
Fully Integrated VTT and VTTR Capability
VTT has
+
2.5A/-2.0A Sourcing/Sinking Capability
Start-up with Pre-biased Output Voltage
VTT and VTTR Outputs Track VREFIN/2
VTT & VTTR 1% of VREFIN/2
Low All-ceramic Output Capacitor Designs
1.0V to 2.8V Input REFIN Range
Analog Soft-start Option and Independent Shutdown
Power-Good Window Comparator
Applications
DDR, DDR II, and DDR III Memory Power Supplies
Desktop Computers
Notebooks and Desknotes
Graphics Cards
Game Consoles
Networking and RAID
Ordering Information
PART NUMBER
PART MARKING
TEMP RANGE (°C)
PACKAGE
PKG. DWG. #
ISL88550AIRZ (See Note)
ISL88550AIRZ
-40 to +85
28 Ld 5×5 Thin QFN (Pb-free)
L28.5x5B
ISL88550AIRZ-T (See Note)
ISL88550AIRZ
-40 to +85
28 Ld 5×5 Thin QFN Tape and Reel (Pb-free) L28.5x5B
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.
Data Sheet
October 12, 2005
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相關代理商/技術參數 |
參數描述 |
|---|---|
| ISL88550AEVAL1 | 功能描述:EVALUATION BOARD 1 ISL88550A RoHS:否 類別:編程器，開發系統 >> 過時/停產零件編號 系列:- 標準包裝:1 系列:- 傳感器類型:CMOS 成像，彩色（RGB） 傳感范圍:WVGA 接口:I²C 靈敏度:60 fps 電源電壓:5.7 V ~ 6.3 V 嵌入式:否 已供物品:成像器板 已用 IC / 零件:KAC-00401 相關產品:4H2099-ND - SENSOR IMAGE WVGA COLOR 48-PQFP4H2094-ND - SENSOR IMAGE WVGA MONO 48-PQFP |
| ISL88550AEVAL1Z | 功能描述:EVALUATION BOARD 1 ISL88550A RoHS:是 類別:編程器，開發系統 >> 評估板 - DC/DC 與 AC/DC（離線）SMPS 系列:- 產品培訓模塊:Obsolescence Mitigation Program 標準包裝:1 系列:True Shutdown™ 主要目的:DC/DC，步升 輸出及類型:1，非隔離 功率 - 輸出:- 輸出電壓:- 電流 - 輸出:1A 輸入電壓:2.5 V ~ 5.5 V 穩壓器拓撲結構:升壓 頻率 - 開關:3MHz 板類型:完全填充 已供物品:板 已用 IC / 零件:MAX8969 |
| ISL88550AIRZ | 功能描述:電壓模式 PWM 控制器 INTEGRTD DDR PWR CNT RLR 2 8LD 5X5 TQFN RoHS:否 制造商:Texas Instruments 輸出端數量:1 拓撲結構:Buck 輸出電壓:34 V 輸出電流: 開關頻率: 工作電源電壓:4.5 V to 5.5 V 電源電流:600 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:WSON-8 封裝:Reel |
| ISL88550AIRZ-T | 功能描述:DC/DC 開關控制器 INTEGRTD DDR PWR CNT RLR 2 8LD 5X5 TQFN RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數量:1 最大工作溫度:+ 125 C 安裝風格: 封裝 / 箱體:CPAK |
| ISL88550AIRZ-T7 | 功能描述:直流/直流開關轉換器 Integrated DDR Power Controller, 28LD 5x5 TQFN Pb-free, 1K O RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數量:2 最大工作溫度:+ 85 C 安裝風格:SMD/SMT |
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