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MIC29311

更新时间： 2024-11-21 22:54:51
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麦瑞 - MICREL 稳压器
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12页 137K
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3A Fast-Response LDO Regulator for USB Preliminary Information

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MIC29311  
3A Fast-Response LDO Regulator for USB  
Preliminary Information  
General Description  
Features  
The MIC29311 is a 3A, fast response, low-dropout (LDO)  
voltage regulator. Using Micrel’s proprietary Super βeta  
PNP™ process, the MIC29311 offers exceptional dropout  
(600mV at 3A) and low ground current (60mA at 3A). Fast  
transient response allows it to recover quickly from large load  
changes while maintaining a steady output. The device can  
be sent into a “zero-current” off mode when the TTL compat-  
ible enable is brought low.  
• Fast transient response  
• 3A output current over full temperature range  
• 600mV dropout voltage at full load  
• Low ground current  
• 3% total accuracy  
• “Zero” off-mode current  
• Thermal Shutdown  
• Current Limiting  
• Reversed battery protection  
• Fixed 5.1V Output  
Designed specifically for Universal Serial Bus (USB) applica-  
tions, the MIC29311 works with USB power switches to  
provide an economical solution for self-powered hubs. The  
5.1V output voltage is optimized to work with lower-cost high  
on-resistance USB power switches (300mΩ) to provide a  
minimum of 4.75V at 500mA to downstream ports. Used with  
MIC2527 quad USB power switches, the MIC29311 can  
power up to 6 downstream ports.  
Applications  
• Self-powered USB hubs  
• USB power switching  
• High-efficiency linear power supplies  
• High-efficiency switching supply post-regulator  
FeaturesoftheMIC29311includethermalshutdown, current  
limit, reversed-battery and reversed-lead insertion protec-  
tion. An overvoltage clamp is available to maintain a safe  
output when the input voltage exceeds 8V. An error flag is  
also available to indicate of the output falls out of regulation,  
or when an overcurrent condition occurs.  
The MIC29311 is available in a 5-pin TO-220 or TO-263  
package with a fixed 5.1V output voltage.  
Forotherhighcurrent,low-dropoutvoltageregulators,please  
see the MIC29150/300/500/750 and the MIC29310,  
MIC29510, MIC29710.  
Typical Application  
Ferrite  
Bead  
MIC29311-5.1  
LDO Regulator  
VBUS  
D+  
5.8V @ 3A  
10k  
5.1V  
AC  
6.3Vac  
3A  
IN  
OUT  
Downstream  
USB  
Line  
EN  
FLAG  
GND  
47µF  
0.01µF  
Port 1  
D–  
33µF  
33µF  
4.75V min  
500mA max.  
GND  
MIC5207-3.3  
33µF  
100mA  
max.  
3.3V USB Controller  
V+  
LDO Regulator  
VBUS  
D+  
IN  
OUT  
ON/OFF  
OVERCURRENT  
VBUS  
D+  
1.0  
µF  
Downstream  
USB  
Port 2  
4.75V min  
500mA max.  
D–  
GND  
0.01µF  
D–  
GND  
4.7  
µF  
GND  
Upstream  
USB Port  
D+  
D–  
GND  
Bold lines indicate  
0.1" wide, 1-oz. copper  
high-current traces.  
10k  
VBUS  
D+  
Downstream  
USB  
0.01µF  
Port 6  
D–  
33µF  
4.75V min  
500mA max.  
GND  
Simple USB Stand-Alone 6-Port Self-Powered Hub  
Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 944-0970 • http://www.micrel.com  
December 1998  
1
MIC29311  
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