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MAX1712

更新时间： 2024-09-17 22:57:59
品牌 Logo 应用领域
美信 - MAXIM 电脑控制器
页数 文件大小 规格书
28页 435K
描述
High-Speed, Digitally Adjusted Step-Down Controllers for Notebook CPUs

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19-4781; Rev 1; 7/00  
High-Speed, Digitally Adjusted  
Step-Down Controllers for Notebook CPUs  
General Description  
Features  
The MAX1710/MAX1711 step-down controllers are  
intended for core CPU DC-DC converters in notebook  
computers. They feature a triple-threat combination of  
ultra-fast transient response, high DC accuracy, and  
high efficiency needed for leading-edge CPU core  
power supplies. Maxim’s proprietary Quick-PWM™  
quick-response, constant-on-time PWM control scheme  
handles wide input/output voltage ratios with ease and  
provides 100ns “instant-on” response to load transients  
while maintaining a relatively constant switching fre-  
quency.  
o Ultra-High Efficiency  
o No Current-Sense Resistor (Lossless I  
)
LIMIT  
o Quick-PWM with 100ns Load-Step Response  
1ꢀ ꢁ Accuracy over Line and Load  
o
OUT  
o 4-Bit On-Board DAC (MAX1710)  
o 5-Bit On-Board DAC (MAX1711/MAX1712)  
o 0.925ꢁ to 2ꢁ Output Adjust Range  
(MAX1711/MAX1712)  
High DC precision is ensured by a 2-wire remote-sens-  
ing scheme that compensates for voltage drops in both  
the ground bus and supply rail. An on-board, digital-to-  
analog converter (DAC) sets the output voltage in com-  
pliance with Mobile Pentium II® CPU specifications.  
o 2ꢁ to 28ꢁ Battery Input Range  
o 200/300/400/550kHz Switching Frequency  
o Remote GND and ꢁ  
Sensing  
OUT  
o Over/Undervoltage Protection  
o 1.7ms Digital Soft-Start  
The MAX1710 achieves high efficiency at a reduced  
cost by eliminating the current-sense resistor found in  
traditional current-mode PWMs. Efficiency is further  
enhanced by an ability to drive very large synchronous-  
rectifier MOSFETs.  
o Drive Large Synchronous-Rectifier FETs  
o 2ꢁ 1ꢀ Reference Output  
o Power-Good Indicator  
Single-stage buck conversion allows these devices to  
directly step down high-voltage batteries for the highest  
possible efficiency. Alternatively, 2-stage conversion  
(stepping down the +5V system supply instead of the  
battery) at a higher switching frequency allows the mini-  
mum possible physical size.  
o Small 24-Pin QSOP Package  
Ordering Information  
PART  
TEMP. RANGE  
-40°C to +85°C  
-40°C to +85°C  
PIN-PACKAGE  
MAX1710EEG  
MAX1711EEG  
24 QSOP  
The MAX1710/MAX1711 are identical except that the  
MAX1711 have 5-bit DACs and the MAX1710 has a 4-  
bit DAC. Also, the MAX1711 has a fixed overvoltage  
24 QSOP  
protection threshold at V  
= 2.25V and undervoltage  
OUT  
Minimal Operating Circuit  
protection at V  
= 0.8V whereas the MAX1710 has  
OUT  
variable thresholds that track V  
. The MAX1711 is  
BATTERY  
4.5V TO 28V  
OUT  
intended for applications where the DAC code may  
change dynamically.  
+5V INPUT  
V
OVP*  
V
CC  
DD  
V+  
Applications  
SHDN  
FBS  
Notebook Computers  
Docking Stations  
BST  
DH  
ILIM  
GNDS  
OUTPUT  
0.925V TO 2V  
CPU Core DC-DC Converters  
(MAX1711/MAX1712)  
MAX1710  
MAX1711  
MAX1712  
Single-Stage (BATT to V  
Converters  
CORE)  
REF  
CC  
LX  
DL  
Two-Stage (+5V to V  
) Converters  
CORE  
D0  
PGND  
D1  
D/A  
INPUTS  
Quick-PWM is a trademark of Maxim Integrated Products.  
Mobile Pentium II is a registered trademark of Intel Corp.  
D2  
FB  
D3  
SKIP  
D4**  
GND  
*MAX1710 ONLY  
**MAX1711/MAX1712 ONLY  
Pin Configurations appear at end of data sheet.  
________________________________________________________________ Maxim Integrated Products  
1
For price, delivery, and to place orders, please contact Maxim Distribution at 1-888-629-4642,  
or visit Maxim’s website at www.maxim-ic.com.  
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