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LM5157-Q1

更新时间： 2024-09-27 02:51:39
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德州仪器 - TI /
页数 文件大小 规格书
42页 1408K
描述
LM5157x-Q1 2.2-MHz Wide VIN 50-V Boost/SEPIC/Flyback Converter with Dual Random Spread Spectrum

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LM5157-Q1 数据手册

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LM5157-Q1, LM51571-Q1  
SNVSBK8 – OCTOBER 2020  
LM5157x-Q1 2.2-MHz Wide VIN 50-V Boost/SEPIC/Flyback Converter with Dual  
Random Spread Spectrum  
1 Features  
2 Applications  
•
AEC-Q100 qualified for automotive applications  
– Temperature grade 1: –40°C to +125°C TA  
Suited for wide operating range for car battery  
applications  
– 2.9-V to 45-V input operating range  
– 48-V maximum output (50-V abs max)  
– Minimum boost supply voltage 1.5 V when  
BIAS ≥ 2.9 V  
•
Battery-powered wide input boost, SEPIC, flyback  
converter  
Automotive voltage stabilizer in SEPIC  
Automotive start-stop application  
Automotive emergency call application/backup  
battery booster  
High voltage LiDAR power supply  
Automotive LED bias supply  
Multiple-output flyback without optocoupler  
Hold-up capacitor charger  
•
•
•
•
•
•
•
•
•
•
– Input transient protection up to 50 V  
– Minimized battery drain  
•
•
Low shutdown current (IQ ≤ 2.6 µA)  
Low operating current (IQ ≤ 670 µA)  
Audio amplifier power supply  
Piezo driver/motor driver bias supply  
•
Small solution size and low cost  
– Maximum switching frequency up to 2.2 MHz  
– 16-pin QFN package (3 mm × 3 mm) with  
wettable flanks  
– Integrated error amplifier allows primary-side  
regulation without optocoupler (flyback)  
– Minimized undershoot during cranking (start-  
stop application)  
3 Description  
The LM5157x-Q1 (LM5157-Q1 and LM51571-Q1)  
device is a wide input range, non-synchronous boost  
converter with integrated 50-V power switch.  
The device can be used in boost, SEPIC, and flyback  
topologies. The device can start up from a 1-cell  
battery with a minimum of 2.9 V. It can operate with  
the input supply voltage as low as 1.5 V if the BIAS  
pin is greater than 2.9 V.  
– Accurate current limit (see the Device  
Comparison Table)  
•
•
•
EMI mitigation  
– Selectable dual random spread spectrum  
– Lead-less package  
Higher efficiency with low-power dissipation  
– 45-mΩ RDSON switch  
– Fast switching, small switching loss  
Avoid AM band interference and crosstalk  
– Optional clock synchronization  
– Dynamically programmable wide switching  
frequency from 100 kHz to 2.2 MHz  
Integrated protection features  
Device Information  
PART NUMBER  
PACKAGE(1)  
BODY SIZE (NOM)  
LM5157x-Q1  
WQFN (16)  
3.00 mm × 3.00 mm  
(1) For all available packages, see the orderable addendum at  
the end of the data sheet.  
VLOAD  
VSUPPLY  
BIAS VCC  
SW  
UVLO  
RT  
FB  
COMP  
•
SS  
PGOOD  
PGND AGND MODE  
– Constant current limiting over input voltage  
– Selectable hiccup mode overload protection  
– Programmable line UVLO  
Typical SEPIC Application  
– OVP protection  
– Thermal shutdown  
•
•
•
•
Accurate ±1% accuracy feedback reference  
Adjustable soft start  
PGOOD indicator  
Create a custom design using the LM5157x-Q1  
with the WEBENCH® Power Designer  
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,  
intellectual property matters and other important disclaimers. ADVANCE INFORMATION for preproduction products; subject to change  
without notice.  
 
 
 
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