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MAX8550

更新时间： 2024-10-02 02:51:03
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美信 - MAXIM 双倍数据速率
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29页 588K
描述
Integrated DDR Power-Supply Solutions for Desktops, Notebooks, and Graphic Cards

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MAX8550 数据手册

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EVALUATION KIT AVAILABLE  
MAX8550/MAX8551  
Integrated DDR Power-Supply Solutions for  
Desktops, Notebooks, and Graphic Cards  
General Description  
Features  
The MAX8550/MAX8551 integrate a synchronous-buck  
Buck Controller  
PWM controller to generate V  
, a sourcing and sinking  
TT  
TTR  
DDQ  
o Quick-PWM with 100ns Load-Step Response  
o Up to 95% Efficiency  
LDO linear regulator to generate V , and a 10mA refer-  
ence output buffer to generate V . The buck controller  
o 2V to 28V Input Voltage Range  
drives two external N-channel MOSFETs to generate out-  
put voltages down to 0.7V from a 2V to 28V input with out-  
put currents up to 15A. The LDO can sink or source up to  
1.5A continuous and 3A peak current. Both the LDO out-  
put and the 10mA reference buffer output can be made  
to track the REFIN voltage. These features make the  
MAX8550/MAX8551 ideally suited for DDR memory appli-  
cations in desktops, notebooks, and graphic cards.  
o 1.8V/2.5V Fixed or 0.7V to 5.5V Adjustable Output  
o Up to 600kHz Selectable Switching Frequency  
o Programmable Current Limit with Foldback  
Capability  
o 1.7ms Digital Soft-Start and Independent  
Shutdown  
o Overvoltage/Undervoltage-Protection Option  
o Power-Good Window Comparator  
LDO Section  
o Fully Integrated VTT and VTTR Capability  
o VTT has ±3A Sourcing/Sinking Capability  
The PWM controller in the MAX8550/MAX8551 utilizes  
Maxim’s proprietary Quick-PWM™ architecture with pro-  
grammable switching frequencies of up to 600kHz. This  
control scheme handles wide input/output voltage ratios  
with ease and provides 100ns response to load tran-  
sients while maintaining high efficiency and a relatively  
constant switching frequency. The MAX8550 offers fully  
programmable UVP/OVP and skip-mode options ideal in  
portable applications. Skip mode allows for improved  
efficiency at lighter loads. The MAX8551, which is tar-  
geted towards desktop and graphic-card applications,  
does not offer the pulse-skip feature.  
o VTT and VTTR Outputs Track V  
/ 2  
REFIN  
o All-Ceramic Output-Capacitor Designs  
o 1.0V to 2.8V Input Voltage Range  
o Power-Good Window Comparator  
Ordering Information  
PART  
TEMP RANGE  
-40°C to +85°C  
-40°C to +85°C  
-40°C to +85°C  
-40°C to +85°C  
PIN-PACKAGE  
The VTT and VTTR outputs track to within 1% of V  
/ 2.  
REFIN  
MAX8550ETI  
MAX8550ETI+  
MAX8551ETI  
MAX8551ETI+  
28 5mm × 5mm TQFN  
28 5mm × 5mm TQFN  
28 5mm × 5mm TQFN  
28 5mm × 5mm TQFN  
The high bandwidth of this LDO regulator allows excel-  
lent transient response without the need for bulk capac-  
itors, thus reducing cost and size.  
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-  
ing the drain-to-source voltage drop of the low-side MOS-  
FET. Additionally, overvoltage and undervoltage  
protection 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 MAX8550/MAX8551  
allow flexible sequencing and standby power manage-  
ment using the SHDNA, SHDNB, and STBY inputs.  
+Denotes a lead(Pb)-free/RoHS-compliant package.  
Pin Configuration  
TOP VIEW  
TON  
+
1
2
3
4
5
6
7
21 DL  
OVP/UVP  
(N.C. FOR  
MAX8551)  
20  
19  
BST  
LX  
REF  
Both the MAX8550 and MAX8551 are available in a  
small 5mm × 5mm, 28-pin thin QFN package.  
MAX8550  
MAX8551  
ILIM  
18 DH  
POK1  
POK2  
STBY  
17  
16  
V
IN  
Applications  
DDR I and DDR II Memory Power Supplies  
Desktop Computers  
OUT  
15 FB  
Notebooks and Desknotes  
Graphic Cards  
Game Consoles  
5mm x 5mm Thin QFN  
RAID  
Networking  
Typical Operating Circuit appears at end of data sheet.  
Quick-PWM is a trademark of Maxim Integrated Products, Inc.  
For pricing, delivery, and ordering information, please contact Maxim Direct  
at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com.  
19-3173; Rev 3; 4/13  
1234567...29

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