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| 型号： | MAX8550AETI+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 1/29页 |
| 文件大小： | 0K |
| 描述： | IC PWR SUP DDR INTEG 28TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 60 |
| 应用： | 控制器，DDR |
| 输入电压： | 2 V ~ 28 V |
| 输出数： | 2 |
| 输出电压： | 1.8V，2.5V，0.7 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-WFQFN 裸露焊盘 |
| 供应商设备封装： | 28-TQFN-EP（5x5） |
| 包装： | 管件 |
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ATION
ILABLE
19-3313; Rev 0; 5/04
EVALU
AVA
KIT
Integrated DDR Power-Supply Solution for
Desktops, Notebooks, and Graphic Cards
General Description
The MAX8550A integrates a synchronous-buck PWM
controller to generate V DDQ , a sourcing and sinking LDO
linear regulator to generate V TT , and a 10mA reference
output buffer to generate V TTR . The buck controller drives
two external n-channel MOSFETs to generate output volt-
ages down to 0.7V from a 2V to 28V input with output cur-
Features
Buck Controller
? Quick-PWM with 100ns Load-Step Response
? Up to 95% Efficiency
? 2V to 28V Input Voltage Range
? 1.8V/2.5V Fixed or 0.7V to 5.5V Adjustable Output
rents up to 15A. The LDO can sink or source up to 1.5A
continuous and 3A peak current. Both the LDO output
and the 10mA reference buffer output can be made to
track the REFIN voltage. These features make the
MAX8550A ideally suited for DDR memory applications in
desktops, notebooks, and graphic cards.
The PWM controller in the MAX8550A utilizes Maxim’s
proprietary Quick-PWM? architecture with programma-
ble switching frequencies of up to 600kHz. This control
scheme handles wide input/output voltage ratios with
ease and provides 100ns response to load transients
?
?
?
?
?
?
?
Up to 600kHz Selectable Switching Frequency
Programmable Current Limit with Foldback
Capability
1.7ms Digital Soft-Start
Independent Shutdown and Standby Controls
Overvoltage/Undervoltage-Protection Option
Power-Good Window Comparator
LDO Section
Fully Integrated VTT and VTTR Capability
while maintaining high efficiency and a relatively con-
stant switching frequency. The MAX8550A offers fully
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 within 1% of V REFIN / 2.
The high bandwidth of this LDO regulator allows excel-
lent transient response without the need for bulk capac-
itors, thus reducing cost and size.
? VTT Has ± 3A Sourcing/Sinking Capability
? VTT and VTTR Outputs Track V REFIN / 2
? All-Ceramic Output-Capacitor Designs
? 1.0V to 2.8V Input Voltage Range
? Power-Good Window Comparator
Ordering Information
The buck controller and LDO regulators are provided with
independent current limits. Adjustable lossless foldback
current limit for the buck regulator is achieved by monitor-
PART
MAX8550AETI
TEMP RANGE
-40 ° C to +85 ° C
PIN-PACKAGE
28 TQFN 5mm × 5mm
ing the drain-to-source voltage drop of the low-side
MOSFET. Additionally, overvoltage and undervoltage pro-
tection mechanisms are built in. Once the overcurrent
condition is removed, the regulator is allowed to enter
soft-start again. This helps minimize power dissipation
during a short-circuit condition. The MAX8550A allows
TOP VIEW
Pin Configuration
flexible sequencing and standby power management
using the SHDN and STBY inputs, which support all
DDRs’ operating states.
The MAX8550A is available in a small 5mm × 5mm, 28-
TON
OVP/UVP
REF
1
2
3
21
20
19
DL
BST
LX
pin thin QFN package.
Applications
DDR I and DDR II Memory Power Supplies
Desktop Computers
ILIM
POK1
POK2
STBY
4
5
6
7
MAX8550A
18
17
16
15
DH
V IN
OUT
FB
Notebooks and Desknotes
Graphic Cards
Game Consoles
RAID
Networking
5mm x 5mm Thin QFN
Typical Operating Circuit appears at end of data sheet.
Quick-PWM is a trademark of Maxim Integrated Products, Inc.
________________________________________________________________ Maxim Integrated Products
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
1
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX8550AETI+ | 功能描述:电压模式 PWM 控制器 Integrated DDR Power Supply Solution RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
| MAX8550AETI+T | 功能描述:电压模式 PWM 控制器 Integrated DDR Power Supply Solution RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
| MAX8550AETI-T | 功能描述:PMIC 解决方案 RoHS:否 制造商:Texas Instruments 安装风格:SMD/SMT 封装 / 箱体:QFN-24 封装:Reel |
| MAX8550ETI | 功能描述:PMIC 解决方案 RoHS:否 制造商:Texas Instruments 安装风格:SMD/SMT 封装 / 箱体:QFN-24 封装:Reel |
| MAX8550ETI+ | 功能描述:电压模式 PWM 控制器 Integrated DDR Power Supply Solution RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
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