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MAX1816

更新时间： 2024-09-12 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
49页 978K
描述
Dual Step-Down Controllers Plus Linear- Regulator Controller for Notebook Computers

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MAX1816 数据手册

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19-2569; Rev 0; 10/02  
Dual Step-Down Controllers Plus Linear-  
Regulator Controller for Notebook Computers  
General Description  
Features  
The MAX1816/MAX1994 are dual step-down controllers  
for notebook computer applications. BUCK1 is a CPU  
core regulator with dynamically adjustable output, ultra-  
fast transient response, high DC accuracy, and high effi-  
ciency. BUCK2 is an adjustable step-down regulator for  
I/O and memory supplies. Both regulators employ Maxim’s  
proprietary Quick-PWM™ control architecture. This fast-  
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 main-  
taining a relatively constant switching frequency. The  
MAX1816/MAX1994 also have a linear-regulator controller  
for low-voltage auxiliary power supplies.  
o Dual Quick-PWM Architecture  
o ±±1 ꢀ Accuracy  
OUT  
o 5-Bit On-Board D/A Converter  
o +0.60ꢀ to +±.75ꢀ Output Adjust Range (MAX±8±6)  
o +0.70ꢀ to +2.00ꢀ Output Adjust Range (MAX±994)  
o ꢀoltage-Positioning Gain and Offset Control  
o +2ꢀ to +28ꢀ Battery Input Range  
o Differential Remote Sense (BUCK±)  
o Linear-Regulator Controller  
o 200/300/550/±000kHz Switching Frequency  
The CPU regulator supports “active voltage positioning”  
to reduce output bulk capacitance and lower power dis-  
sipation. A programmable gain amplifier allows the use  
of lower value sense resistors. Four fixed-gain settings  
are available (0, 1.5, 2, and 4). A differential remote-  
sense amplifier is also included to more accurately con-  
trol the voltage at the load. Accuracy is further  
enhanced with an internal integrator.  
o 2.2mA (typ) I  
Supply Current  
CC  
o 20µA (max) Shutdown Supply Current  
o Independent Power-Good Outputs  
(PGOOD, LINGOOD)  
Ordering Information  
The MAX1816/MAX1994 include a specialized digital  
interface that makes them suitable for mobile CPU and  
video processor applications. The power-good  
(PGOOD) output for the core regulator is forced high  
during VID transitions, and the LINGOOD output for the  
linear regulator includes a 1ms (min) turn-on delay.  
PART  
MAX±8±6ETM  
MAX±994ETM  
TEMP RANGE  
-40°C to +100°C  
-40°C to +100°C  
PIN-PACKAGE  
48 Thin QFN  
48 Thin QFN  
Pin Configuration  
BUCK1, BUCK2, and the linear regulator feature overvolt-  
age protection (OVP). The detection threshold for BUCK1  
is adjusted with an external resistive voltage-divider, while  
the OVP thresholds for BUCK2 and the linear regulator  
TOP VIEW  
are fixed. Connecting the OVPSET pin to V  
disables  
CC  
OVP for BUCK1 and BUCK2, but not the linear regulator.  
36  
35  
34  
33  
32  
31  
30  
29  
28  
27  
26  
25  
ILIM1  
CC  
1
2
3
4
5
6
7
8
9
ILIM2  
CS2  
The MAX1816 features an output-voltage adjustment  
range from 0.6V to 1.75V. Similarly, the MAX1994 is  
adjustable from 0.925V to 2.0V, using an alternate VID  
code set. While in suspend mode, the adjustment range  
is 0.7V to 1.075V for both the MAX1816 and MAX1994.  
Both parts are available in 48-pin thin QFN packages.  
CS1+  
CS1-  
FBS  
GDS  
GAIN  
OFS0  
OFS1  
OUT2  
FB2  
REF  
V
CC  
MAX1816  
MAX1994  
AGND  
LINBSE  
LINGOOD  
LINFB  
Applications  
Mobile CPU Core and Video Processors  
OFS2 10  
SUS 11  
TIME  
Memory I/O and VID Supplies  
OVPSET  
DPSLP 12  
3- to 4-Cell Li+ Battery to CPU Core Supply  
Small Notebook Computers  
THIN QFN 7mm × 7mm  
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.  
1234567...49

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