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MAX5943_07

更新时间： 2024-11-19 11:16:23
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美信 - MAXIM 开关控制器
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20页 407K
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FireWire Current Limiter and Low-Drop ORing Switch Controller

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19-3378; Rev 2; 10/07  
FireWire Current Limiter and Low-Drop  
ORing Switch Controller  
MAX5943  
General Description  
Features  
o Provides Safe Hot Swap for 7.5V to 37V Power  
The MAX5943 is a fully integrated power-management  
®
Supplies  
IC for FireWire applications. This device controls two  
external power n-channel MOSFETs to regulate current  
from the input power supply to the load and performs  
low-voltage-drop, power-supply ORing. The MAX5943  
operates over a 7.5V to 37V input range and provides  
inrush and output current limit in addition to a diode  
ORing function suitable for FireWire applications. The  
MAX5943 FireWire/IEEE 1394™ protective circuit  
(Figure 12) is UL® recognized.  
o UL-Recognized FireWire/IEEE 1394 Protective  
Circuit  
o Low-Drop Power ORing with Ultra-Fast Turn-Off  
o Programmable Active Current Limit (MAX5943A)  
o Programmable Circuit Breaker  
(MAX5943B–MAX5943E)  
o
5% Current-Limit Sensing Accuracy  
The MAX5943 allows the safe insertion and removal of  
FireWire peripherals into a live FireWire port by providing  
inrush current control and an output current-limiting func-  
tion. The ORing feature provides a very efficient way to  
protect the FireWire port when connected to another  
FireWire peripheral that sources a higher voltage. By turn-  
ing off both external MOSFETS, the MAX5943 provides a  
true bidirectional load disconnect. A low-current shut-  
down mode disables the MAX5943, resulting in less than  
10µA supply current. A pin-selectable input allows  
latched or autoretry fault management after a fault.  
o Programmable Current-Limit/Circuit-Breaker  
Timeout  
o Fast Current-Limit Response to Output Short-  
Circuit Conditions (MAX5943A)  
o Drives External N-Channel Power MOSFETs  
o Overcurrent Fault Status Output  
o Latched or Autoretry Overcurrent Fault  
Management  
o 10µA Shutdown Current  
o ON/OFF Control Allows Undervoltage Lockout  
The MAX5943A features a current-limit function that  
actively limits the current drawn by the load with a pro-  
grammable timeout. The MAX5943B–MAX5943E do not  
actively limit the load current but provide a circuit-breaker  
function. See the Selector Guide for the default and pro-  
grammable circuit-breaker timeouts.  
Programming  
o Fast Load Disconnect Control Through ON Input  
Ordering Information  
PART  
TEMP RANGE  
-40°C to +85°C  
-40°C to +85°C  
-40°C to +85°C  
-40°C to +85°C  
-40°C to +85°C  
PIN-PACKAGE  
16 QSOP  
The MAX5943 operates over the -40°C to +85°C extended  
temperature range and is available in a 16-pin QSOP  
package.  
MAX5943AEEE  
MAX5943BEEE  
MAX5943CEEE  
MAX5943DEEE  
MAX5943EEEE  
16 QSOP  
16 QSOP  
Applications  
16 QSOP  
FireWire Desktop/Notebook Port  
FireWire Peripheral Device Current Limit  
FireWire Hub  
16 QSOP  
Pin Configuration  
Hot Swap  
TOP VIEW  
ON  
1
2
3
4
5
6
7
8
16 IN  
FAULT  
TIM  
15 SENSE  
14 GATE1  
ILIM  
MAX5943  
13 N.C.  
12 GATE2  
11 OUT  
10 N.C.  
LATCH  
Typical Operating Circuit and Selector Guide appear at end  
of data sheet.  
OR_ADJ  
N.C.  
FireWire is a registered trademark of Apple Computers, Inc.  
ONQ1  
9
GND  
IEEE 1394 is a trademark of the Institute of Electrical and  
Electronics Engineers trademark.  
QSOP  
UL is a registered trademark of Underwriters Laboratories, Inc.  
________________________________________________________________ Maxim Integrated Products  
1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,  
or visit Maxim’s website at www.maxim-ic.com.  
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