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LM5146

更新时间： 2024-11-24 02:52:03
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德州仪器 - TI /
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LM5146 100-V Synchronous Buck DC/DC Controller With Wide Duty Cycle Range

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LM5146  
SNVSBV0A – JUNE 2021 – REVISED JUNE 2021  
LM5146 100-V Synchronous Buck DC/DC Controller With Wide Duty Cycle Range  
1 Features  
2 Applications  
•
Functional Safety-Capable  
– Documentation available to aid functional safety  
system design  
•
•
•
•
•
•
Wireless infrastructure, cloud computing  
Industrial motor drives, test and measurement  
Personal transport vehicle: electric bike  
Asset tracking and fleet management systems  
Non-isolated PoE, IP cameras  
•
Versatile synchronous buck DC/DC controller  
– Wide input voltage range of 5.5 V to 100 V  
– 150°C maximum junction temperature  
– 0.8-V reference with ±1% feedback accuracy  
– Adjustable output voltage from 0.8 V to 60 V  
– 40-ns tON(min) for high VIN / VOUT ratio  
– 140-ns tOFF(min) for low dropout  
– Lossless RDS(on) or shunt current sensing  
– Optimized for CISPR 11 and CISPR 32 Class B  
EMI requirements  
Switching frequency from 100 kHz to 1 MHz  
– SYNC in and SYNC out capability  
– Selectable diode emulation or FPWM  
7.5-V gate drivers for standard VTH MOSFETs  
– 14-ns adaptive dead-time control  
– 2.3-A source and 3.5-A sink capability  
Fast line and load transient response  
– Voltage-mode control with line feedforward  
– High gain-bandwidth error amplifier  
Inherent protection features for robust design  
– Adjustable output voltage soft start  
– Hiccup-mode overcurrent protection  
– Input UVLO with hysteresis  
– VCC and gate-drive UVLO protection  
– Precision enable input and open-drain PGOOD  
indicator for sequencing and control  
– Thermal shutdown protection with hysteresis  
20-pin VQFN package with wettable flanks  
Create a custom design using the LM5146 with  
WEBENCH® Power Designer  
Inverting buck-boost regulators  
3 Description  
The LM5146 100-V synchronous buck controller  
regulates from a high input voltage source or from an  
input rail subject to high-voltage transients, minimizing  
the need for external surge suppression components.  
A high-side switch minimum on-time of 40 ns gives  
large step-down ratios, enabling the direct step-down  
conversion from a 48-V nominal input to low-voltage  
rails for reduced system complexity and solution cost.  
The LM5146 continues to operate during input voltage  
dips as low as 5.5 V, at nearly 100% duty cycle  
if needed, making it an excellent choice for high-  
performance industrial controls, robotics, datacom,  
and RF applications.  
•
•
•
•
Forced-PWM (FPWM) operation eliminates switching  
frequency variation to minimize EMI, while  
user-selectable diode emulation lowers current  
consumption at light-load conditions. The adjustable  
switching frequency as high as 1 MHz can be  
synchronized to an external clock source to eliminate  
beat frequencies in noise-sensitive applications.  
Device Information  
PART NUMBER  
LM5146  
PACKAGE(1)  
BODY SIZE (NOM)  
•
•
VQFN (20)  
4.50 mm × 3.50 mm  
(1) For all available packages, see the orderable addendum at  
the end of the data sheet.  
VIN  
EN  
VIN  
VOUT  
VIN  
EN/UVLO  
Q1  
SYNCIN  
SYNC In  
HO  
BST  
SW  
LO  
RC2  
SYNC Out  
CC1  
SYNCOUT  
COMP  
FB  
RFB1  
LF  
CBST  
CC3  
VOUT  
RC1  
CC2  
LM5146  
Q2  
RT  
CIN  
COUT  
RFB2  
VCC  
SS/TRK  
AGND  
RRT  
CSS  
CVCC  
PGND  
GND  
PGOOD  
ILIM  
RILIM  
PG  
Typical Application Circuit and Efficiency Performance, VOUT = 12 V, FSW = 400 kHz  
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. PRODUCTION DATA.  
 
 
 
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