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LT8648S

更新时间： 2024-09-24 02:51:35
品牌 Logo 应用领域
亚德诺 - ADI /
页数 文件大小 规格书
28页 2073K
描述
42V, 10A/12A Peak Synchronous Step-Down Silent Switcher 2

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LT8648S 数据手册

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LT8638S  
42V, 10A/12A Peak Synchronous  
Step-Down Silent Switcher 2  
FEATURES  
DESCRIPTION  
Silent Switcher®2 Architecture  
The LT®8638S synchronous step-down regulator  
features second generation Silent Switcher architecture  
designed to minimize EMI emissions while delivering high  
n
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Ultralow EMI Emissions on Any PCB  
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Eliminates PCB Layout Sensitivity  
n
efficiency at high switching frequencies. This includes  
the integration of input capacitors to optimize all the fast  
current loops inside and make it easy to achieve advertised  
EMI performance by reducing layout sensitivity. This  
performance makes the LT8638S ideal for noise sensitive  
applications and environments.  
Internal Bypass Capacitors Reduce Radiated EMI  
n
Optional Spread Spectrum Modulation  
High Efficiency at High Frequency  
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Up to 96% Efficiency at 1MHz, 12V to 5V  
Up to 94% Efficiency at 2MHz, 12V to 5V  
IN  
IN  
OUT  
OUT  
n
n
n
n
n
Wide Input Voltage Range: 2.8V to 42V  
10A Maximum Continuous, 12A Peak Transient Output  
The fast, clean, low overshoot switching edges enable high  
efficiency operation even at high switching frequencies,  
leading to a small overall solution size. Peak current mode  
control with a 25ns minimum on-time allows high step  
down ratios even at high switching frequencies. External  
compensation via the VC pin allows for fast transient  
response. PolyPhase operation allows multiple LT8638S  
regulators to run with interleaving phase shift to provide  
more output current.  
Fast Transient Response with External Compensation  
Low Quiescent Current Burst Mode® Operation  
n
90µA I Regulating 12V to 5V  
Q
IN  
P-P  
OUT  
n
Output Ripple < 10mV  
n
n
n
n
n
n
n
n
n
Reference Accuracy: 1ꢀ Over Temperature  
Fast Minimum Switch On-Time: 25ns  
PolyPhase® Operation: Up to 12 Phases  
Low Dropout Under All Conditions: 45mV at 1A  
Adjustable and Synchronizable: 200kHz to 3MHz  
Output Soft-Start and Power Good  
Burst Mode operation enables low standby current  
consumption, forced continuous mode can control  
frequency harmonics across the entire output load  
range, or spread spectrum operation can further reduce  
EMI emissions. Soft-start and tracking functionality is  
accessed via the SS pin, and an accurate input voltage  
UVLO threshold can be set using the EN/UV pin.  
Safely Tolerates High Reverse Current  
28-Lead 5mm × 4mm LQFN Package  
AEC-Q100 Qualified for Automotive Applications  
APPLICATIONS  
n
All registered trademarks and trademarks are the property of their respective owners. Protected  
by U.S. patents, including 8823345.  
Automotive and Industrial Supplies  
General Purpose Step-Down  
n
12VIN to 5VOUT Efficiency  
TYPICAL APPLICATION  
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5V 10A Step-Down Converter  
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ꢀꢁꢂꢀꢃ ꢄꢅ0ꢆꢇ  
Rev. 0  
1
Document Feedback  
For more information www.analog.com  
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