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MAX1855

更新时间： 2024-09-11 22:57:59
品牌 Logo 应用领域
美信 - MAXIM 控制器
页数 文件大小 规格书
33页 839K
描述
High-Speed, Adjustable, Synchronous Step-Down Controllers with Integrated Voltage Positioning

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19-1758; Rev 0; 8/00  
High-Speed, Adjustable, Synchronous Step-Down  
Controllers with Integrated Voltage Positioning  
General Description  
Features  
The MAX1716/MAX1854/MAX1855 step-down con-  
trollers are intended for core CPU DC-DC converters in  
notebook computers. They feature a dynamically  
adjustable output (5-bit DAC), ultra-fast transient  
response, high DC accuracy, and high efficiency need-  
ed 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 relative-  
ly constant switching frequency.  
o High-Efficiency Voltage Positioning  
o Quick-PWM Architecture  
o ±±1 V  
Line-Regulation Accuracy  
OUT  
o Adjustable Output Range (5-Bit DAC)  
MAX±7±6: 0.925V to ±.6V  
MAX±854: 0.925V to 2.0V  
MAX±855: 0.600V to ±.75V  
o 2V to 28V Input Range  
o 200/300/400/550kHz Switching Frequency  
o Output Undervoltage Protection  
The MAX1716/MAX1854/MAX1855 are designed  
specifically for CPU core applications requiring a volt-  
age-positioned supply. The voltage-positioning input  
(VPS), combined with a high DC accuracy control loop,  
is used to implement a power supply that modifies its  
output set point in response to the load current. This  
arrangement decreases full-load power dissipation and  
reduces the required number of output capacitors.  
o Overvoltage Protection (MAX±7±6/MAX±855)  
o Drive Large Synchronous-Rectifier MOSFETs  
o ±.7ms Digital Soft-Start  
o 700µA I  
Supply Current  
CC  
The 28V input range of the MAX1716/MAX1854/MAX1855  
enables single-stage buck conversion from high-volt-  
age batteries for the maximum possible efficiency.  
Alternatively, the devices’ high-frequency capability  
combined with two-stage conversion (stepping down  
the +5V system supply instead of the battery) allows  
the smallest possible physical size. The output voltage  
can be dynamically adjusted through the 5-bit digital-  
to-analog converter (DAC) inputs.  
o ±µA Shutdown Supply Current  
o 2V ±±1 Reference Output  
o V  
Transition-Complete Indicator  
GATE  
o Small 24-Pin QSOP Package  
Typical Operating Circuit  
The MAX1716/MAX1854/MAX1855 are available in a  
24-pin QSOP package. For applications requiring  
SpeedStep™ power control (see the MAX1717).  
BATTERY  
2V TO 28V  
+5V INPUT  
________________________Applications  
V
V
DD  
V+  
CC  
SHDN  
ILIM  
REF  
Notebook Computers  
BST  
DH  
Docking Stations  
OUTPUT  
CPU Core Supply  
MAX1716  
MAX1854  
MAX1855  
CC  
LX  
DL  
Single-Stage (BATT to V  
) Converters  
CORE  
SKIP  
Two-Stage (+5V to V  
) Converters  
CORE  
GND  
TON  
CS  
VPS  
Ordering Information  
D0  
D1  
D2  
D3  
D4  
PART  
TEMP. RANGE  
-40°C to +85°C  
-40°C to +85°C  
-40°C to +85°C  
PIN-PACKAGE  
24 QSOP  
PGND  
DAC  
INPUTS  
MAX±7±6EEG  
MAX±854EEG  
MAX±855EEG  
24 QSOP  
FB  
VGATE  
24 QSOP  
Quick-PWM is a trademark of Maxim Integrated Products.  
SpeedStep is a trademark of Intel Corp.  
Pin Configuration appears at end of data sheet.  
________________________________________________________________ Maxim Integrated Products  
±
For free samples and the latest literature, visit www.maxim-ic.com or phone 1-800-998-8800.  
For small orders, phone 1-800-835-8769.  
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