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MAX1971

更新时间： 2024-11-05 22:57:59
品牌 Logo 应用领域
美信 - MAXIM 稳压器
页数 文件大小 规格书
20页 370K
描述
Dual, 180∑ Out-of-Phase, 1.4MHz, 750mA Step- Down Regulator with POR and RSI/PFO

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MAX1971 数据手册

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19-2297; Rev 0; 1/02  
Dual, 180° Out-of-Phase, 1.4MHz, 750mA Step-  
Down Regulator with POR and RSI/PFO  
General Description  
Features  
The MAX1970/MAX1971/MAX1972 dual-output current-  
mode PWM buck regulators operate from 2.6V to 5.5V  
input and deliver a minimum of 750mA on each output.  
The MAX1970 and MAX1972 operate at a fixed 1.4MHz  
(MAX1971 operates at 700kHz) to reduce output induc-  
tor and capacitor size and cost. Switching the regula-  
tors 180° out-of-phase also reduces the input capacitor  
size and cost. Ceramic capacitors can be used for  
input and output.  
o Current-Mode, 1.4MHz Fixed-Frequency PWM  
Operation  
o 180° Out-of-Phase Operation Reduces Input  
Capacitor  
o
1ꢀ Output ꢁccuracy Oꢂer ꢃoad, ꢃine, and  
Temperature Ranges  
o 750mꢁ Guaranteed Output Current  
o 2.6V to 5.5V Input  
The output voltages are programmable from 1.2V to V  
IN  
o Power-On Reset Delay of 16.6ms (MꢁX1970) or  
175ms (MꢁX1971 and MꢁX1972)  
o Power-Fail Output (MꢁX1970 and MꢁX1972 Only)  
using external feedback resistors, or can be preset to  
1.8V or 3.3V for output 1 and 1.5V or 2.5V for output 2.  
When one output is higher than 1.2V, the second can  
be configured down to sub-1V levels. Output accuracy  
is better than 1ꢀ over variations in load, line, and tem-  
perature. Internal soft-start reduces inrush current dur-  
ing startup.  
o Power-On Reset Input (MꢁX1971 Only)  
o Operation Outside xDSꢃ Band  
o Ultra-Compact Design with Smallest External  
All devices feature power-on reset (POR). The  
MAX1971 includes a reset input (RSI), which forces  
POR low for 175ms after RSI goes low. The MAX1970  
and MAX1972 include an open-drain power-fail output  
(PFO) that monitors input voltage and goes high when  
the input falls below 3.94V. For USB-powered xDSL  
modems, this output can be used to detect USB power  
failure. A minimum switching frequency of 1.2MHz  
ensures operation outside the xDSL band.  
Components  
o Outputs ꢁdjustable from 0.8V to V or 1.8V/3.3V  
and 1.5V/2.5V Preset  
o ꢁll-Ceramic Capacitor ꢁpplication  
o Soft-Start Reduces Inrush Current  
IN  
Ordering Information  
Applications  
PART  
TEMP RANGE  
-40°C to +85°C  
-40°C to +85°C  
-40°C to +85°C  
PIN-PACKAGE  
16 QSOP  
xDSL Modems  
xDSL Routers  
USB-Powered Devices  
MAX1970EEE  
MAX1971EEE  
MAX1972EEE  
Dual LDO Replacement  
16 QSOP  
Copper Gigabit SFP  
and GBIC Modules  
16 QSOP  
Pin Configuration  
Typical Operating Circuit  
V
2.6V TO 5.5V  
IN  
TOP VIEW  
POR  
LX1  
1
2
3
4
5
6
7
8
16 PGND  
15 LX2  
14 IN  
V
IN  
CC  
RSI  
EN  
RSI  
EN  
POR  
LX1  
OUT1  
1.8V  
750mA  
V
CC  
MAX1971  
COMP1  
FB1  
COMP1  
FB1  
MAX1970  
MAX1971  
MAX1972  
13 FBSEL1  
12 FBSEL2  
OUT2  
2.5V  
750mA  
COMP2  
FBSEL1  
LX2  
FB2  
FB2  
PF0 (MAX1970/MAX1972)  
RSI (MAX1971)  
COMP2  
REF  
11  
V
CC  
10 EN  
FBSEL2  
REF  
GND  
9
POR  
PGND  
QSOP  
________________________________________________________________ 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...20

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