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MAX1864TEEE

更新时间： 2024-11-04 22:19:55
品牌 Logo 应用领域
美信 - MAXIM 调制解调器电缆调制解调器
页数 文件大小 规格书
25页 383K
描述
xDSL/Cable Modem Triple/Quintuple Output Power Supplies

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MAX1864TEEE 数据手册

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19-2030; Rev 0; 4/01  
xDSL/Cable Modem Triple/Quintuple Output  
Power Supplies  
General Description  
Features  
The MAX1864/MAX1865 power-supply controllers are  
designed to address cost-conscious applications such  
as cable modem Consumer Premise Equipment (CPE),  
xDSL CPE, and set-top boxes. Operating off a low-cost,  
unregulated DC supply (such as a wall adapter output),  
the MAX1864 generates three positive outputs, and the  
MAX1865 generates four positive outputs and one neg-  
ative output to provide a cost-effective system power  
supply.  
ꢀ 4.5V to 28V Input Voltage Range  
ꢀ Master DC-DC Step-Down Converter  
Preset 3.3V or Adjustable (1.236V to 0.8 ✕ V )  
IN  
Output Voltage  
Fixed-Frequency (100kHz/200kHz) PWM  
Controller  
No Current-Sense Resistor  
Adjustable Current Limit  
95% Efficient  
The MAX1864 includes a current-mode synchronous  
step-down controller and two positive regulator gain  
blocks. The MAX1865 has one additional positive gain  
block and one negative regulator gain block. The main  
synchronous step-down controller generates a  
high-current output that is preset to 3.3V or adjustable  
ꢀ Two (MAX1864)/Four (MAX1865) Analog  
Gain Blocks  
Positive Analog Blocks Drive Low-Cost PNP  
Pass Transistors to Build Positive Linear  
Regulators  
from 1.236V to 0.8 ✕ V with an external resistive-  
IN  
divider. The 100kHz/200kHz operating frequency  
allows the use of low-cost aluminum-electrolytic capaci-  
tors and low-cost power magnetics. Additionally, the  
MAX1864/MAX1865 step-down controllers sense the  
voltage across the low-side MOSFET’s on-resistance to  
efficiently provide the current-limit signal, eliminating  
the need for costly current-sense resistors.  
Negative Analog Block (MAX1865) Drives a  
Low-Cost NPN Pass Transistor to Build a  
Negative Linear Regulator  
ꢀ Power-Good Indicator  
ꢀ Soft-Start Ramp for All Positive Regulators  
The MAX1864/MAX1865 generate additional supply  
rails at low cost. The positive regulator gain blocks use  
an external PNP pass transistor to generate low-voltage  
rails directly from the main step-down converter (such  
as 2.5V or 1.8V from the main 3.3V output) or higher  
voltages using coupled windings from the step-down  
converter (such as 5V, 12V, or 15V). The MAX1865’s  
negative gain block uses an external NPN pass transis-  
tor in conjunction with a coupled winding to generate  
-5V, -12V, or -15V.  
Ordering Information  
TEMP.  
PIN-  
f
OSC  
PART  
RANGE  
PACKAGE  
(kHz)  
MAX1864TEEE  
MAX1864UEEE  
MAX1865TEEP  
MAX1865UEEP  
-40 C to +85 C  
-40 C to +85 C  
-40 C to +85 C  
-40 C to +85 C  
16 QSOP  
16 QSOP  
20 QSOP  
20 QSOP  
200  
100  
200  
100  
All output voltages are externally adjustable, providing  
maximum flexibility. Additionally, the MAX1864/  
MAX1865 feature soft-start for the step-down converter  
and all the positive linear regulators, and have a power-  
good output that monitors all of the output voltages.  
Pin Configurations  
TOP VIEW  
POK  
1
2
3
4
5
6
7
8
16 IN  
COMP  
OUT  
FB  
15 VL  
14 BST  
Applications  
xDSL, Cable, and ISDN Modems  
Set-Top Boxes  
MAX1864  
13 DH  
12 LX  
11 DL  
10 GND  
B2  
FB2  
B3  
Wireless Local Loop  
FB3  
9
ILIM  
16 QSOP  
Pin Configurations continued at end of data sheet.  
________________________________________________________________ Maxim Integrated Products  
1
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...25

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MAX1864TEEE 替代型号

型号 品牌 替代类型 描述 数据表
MAX1864TEEE+ MAXIM

功能相似

 Switching Controller, Current-mode, 0.5A, 240kHz Switching Freq-Max, BICMOS, PDSO16, 0.150

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MAX1864TEEE+ MAXIM

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MAX1864UEEE MAXIM

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MAX1864UEEE+ MAXIM

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MAX1864UEEE+T MAXIM

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MAX1864UEEE-T MAXIM

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 		Switching Controller, Current-mode, 0.5A, 120kHz Switching Freq-Max, BICMOS, PDSO16, 0.150
MAX1865 MAXIM

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MAX1865TEEP MAXIM

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MAX1865TEEP+ MAXIM

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 		Switching Controller, Current-mode, 0.5A, 240kHz Switching Freq-Max, BICMOS, PDSO20, 0.150
MAX1865TEEP+T MAXIM

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 		Switching Controller, Current-mode, 0.5A, 240kHz Switching Freq-Max, BICMOS, PDSO20, 0.150
MAX1865TEEP-T MAXIM

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 		Switching Controller, Current-mode, 0.5A, 240kHz Switching Freq-Max, BICMOS, PDSO20, 0.150

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