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MIC24051 PDF预览

MIC24051

更新时间: 2024-11-09 14:54:35
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美国微芯 - MICROCHIP /
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34页 1909K
描述
The MIC24051 is a constant-frequency, synchronous buck regulator featuring a unique adaptive on-ti

MIC24051 数据手册

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MIC24051  
12V, 6A High-Efficiency Buck Regulator  
®
with Hyper Speed Control  
Features  
General Description  
• Hyper Speed Control® Architecture Enables:  
The MIC24051 is a constant-frequency, synchronous  
buck regulator featuring a unique adaptive on-time  
control architecture. The MIC24051 operates over an  
input supply range of 4.5V to 19V and provides a  
regulated output of up to 6A of output current. The  
output voltage is adjustable down to 0.8V with a  
guaranteed accuracy of ±1%, and the device operates  
at a switching frequency of 600 kHz.  
- High Delta V Operation (VIN = 19V and VOUT  
= 0.8V)  
- Small Output Capacitance  
• 4.5V to 19V Voltage Input  
• 6A Output Current Capability, up to 95%  
Efficiency  
• Adjustable Output from 0.8V to 5.5V  
• ±1% Feedback Accuracy  
Microchip’s Hyper Speed Control® architecture allows  
for ultra-fast transient response while reducing the  
output capacitance and also makes (High VIN)/(Low  
VOUT) operation possible. This adaptive tON ripple  
control architecture combines the advantages of  
fixed-frequency operation and fast transient response  
in a single device.  
• Any Capacitor Stable - Zero-to-High ESR  
• 600 kHz Switching Frequency  
• No External Compensation  
• Power Good (PG) Output  
• Foldback Current-Limit and “Hiccup Mode”  
Short-Circuit Protection  
The MIC24051 offers a full suite of protection features  
to ensure protection of the IC during fault conditions.  
These include undervoltage lockout to ensure proper  
operation under power-sag conditions, internal  
soft-start to reduce inrush current, foldback current  
limit, “hiccup mode” short-circuit protection and thermal  
shutdown. An open-drain Power Good (PG) pin is  
provided.  
• Supports Safe Start-Up into a Pre-Biased Load  
• –40°C to +125°C Junction Temperature Range  
• Available in a 28-pin 5 mm x 6 mm QFN Package  
Applications  
• Servers and Workstations  
• Routers, Switches, and Telecom Equipment  
• Base Stations  
The 6A HyperLight Load® part, MIC24052, is also  
available on Microchip’s web site.  
Typical Application Schematic  
MIC24051  
28-PIN QFN  
MIC24051  
VDD  
PVDD  
2.2μF  
BST  
0.1μF  
SGND  
10k  
10k  
2.2μH  
0.1μF  
19.6k  
VOUT  
1.8V/6A  
SW  
CS  
PG  
PG  
VIN  
VIN  
PVIN  
4.7nF  
4.5V TO 19V  
100μF  
4.7μF  
x2  
2.49k  
2.00k  
PGND  
EN  
FB  
EN  
2016 Microchip Technology Inc.  
DS20005658A-page 1  

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