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MAX1718T_08

更新时间： 2024-09-18 11:18:19
品牌 Logo 应用领域
美信 - MAXIM 电脑控制器
页数 文件大小 规格书
34页 427K
描述
Notebook CPU Step-Down Controller

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19-2682; Rev 1; 10/08  
Notebook CPU Step-Down Controller  
MAX718T  
General Description  
Features  
o Quick-PWM Architecture  
o ±±1 ꢀ Accuracy Over Line and Load  
The MAX1718T step-down controller is intended for core  
CPU DC-to-DC converters in notebook computers. It fea-  
tures a dynamically adjustable output, 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 relatively  
constant switching frequency.  
OUT  
o 5-Bit On-Board DAC with Input Muxes  
o Precision-Adjustable ꢀ Slew Control  
OUT  
o 0.6ꢀ to ±.75ꢀ Output Adjust Range  
o Precision Offset Control  
o Supports ꢀoltage-Positioned Applications  
o 2ꢀ to 28ꢀ Battery Input Range  
o Requires a Separate 5ꢀ Bias Supply  
The output voltage can be dynamically adjusted  
through the 5-bit digital-to-analog converter (DAC) over  
a 0.6V to 1.75V range. The MAX1718T has an internal  
multiplexer that accepts three unique 5-bit VID DAC  
codes corresponding to performance, battery, and sus-  
pend modes. Precision slew-rate control provides “just-  
in-time” arrival at the new DAC setting, minimizing  
surge currents to and from the battery.  
o 200kHz/300kHz/550kHz/±000kHz Switching  
Frequency  
o Overvoltage/Undervoltage Protection  
o Drives Large Synchronous-Rectifier FETs  
o 700µA (typ) I  
Supply Current  
CC  
o 2µA (typ) Shutdown Supply Current  
o 2ꢀ ±±1 Reference Output  
A pair of complementary offset control inputs allows  
easy compensation for IR drops in PCB traces or cre-  
ation of a voltage-positioned power supply. Voltage  
positioning modifies the load-transient response to  
reduce output capacitor requirements and total system  
power dissipation.  
o ꢀGATE Blanking During Transition  
o Small 28-Pin QSOP Package  
Ordering Information  
PART  
TEMP RANGE  
PIN-PACKAGE  
MAX1718TEEI  
-40°C to +85°C  
28 QSOP  
Single-stage buck conversion allows these devices to  
directly step down high-voltage batteries for the highest  
possible efficiency. Alternatively, two-stage conversion  
(stepping down the 5V system supply instead of the  
battery) at a higher switching frequency allows the mini-  
mum possible physical size.  
Minimal Operating Circuit  
5V INPUT  
BATT 2V TO 28V  
V
V
DD  
CC  
The MAX1718T is available in a 28-pin QSOP package.  
SKP/SDN  
V+  
SHUTDOWN  
ILIM  
BST  
DH  
OUTPUT  
0.6V TO 1.75V  
Applications  
MAX1718T  
D0  
D1  
D2  
D3  
D4  
2-Cell to 4-Cell Li+ Battery to CPU Core Supply  
Converters  
LX  
DUAL MODE™ VID  
MUX INPUTS  
5V to CPU Core Supply Converters  
DL  
GND  
ZMODE  
SUS  
MUX CONTROL  
SUSPEND  
INPUT  
DECODER  
S0  
S1  
FB  
NEG  
POS  
TIME  
CC  
VCC  
REF  
POWER-GOOD  
OUTPUT  
VGATE  
OVP  
TON  
Pin Configuration appears at end of data sheet.  
Quick-PWM is a trademark of Maxim Integrated Products, Inc.  
Dual Mode is a trademark of Maxim Integrated Products, Inc.  
________________________________________________________________ Maxim Integrated Products  
±
For pricing, delivery, and ordering information, please contact Maxim Direct at ±-888-629-4642,  
or visit Maxim’s website at www.maxim-ic.com.  
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