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LM2745

更新时间： 2024-11-25 12:48:31
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德州仪器 - TI 控制器时钟
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37页 1275K
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LM2745 / LM2748 Synchronous Buck Controller with Pre-Bias Startup, and Optional Clock

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LM2745 数据手册

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LM2745, LM2748  
www.ti.com  
SNOSAL2E –APRIL 2005–REVISED APRIL 2013  
LM2745 / LM2748 Synchronous Buck Controller with Pre-Bias Startup, and Optional Clock  
Synchronization  
Check for Samples: LM2745, LM2748  
1
FEATURES  
DESCRIPTION  
The LM2745/8 are high-speed synchronous buck  
regulator controllers with an accurate feedback  
voltage accuracy of ±1.5%. It can provide simple  
down conversion to output voltages as low as 0.6V.  
Though the control sections of the IC are rated for 3  
to 6V, the driver sections are designed to accept  
input supply rails as high as 14V. The use of adaptive  
non-overlapping MOSFET gate drivers helps avoid  
potential shoot-through problems while maintaining  
high efficiency. The IC is designed for the more cost-  
effective option of driving only N-channel MOSFETs  
in both the high-side and low-side positions. It senses  
the low-side switch voltage drop for providing a  
simple, adjustable current limit.  
2
•
Switching Frequency from 50 kHz to 1 MHz  
•
Switching Frequency Synchronize Range 250  
kHz to 1 MHz (LM2745 Only)  
•
•
•
•
•
•
Startup with a Pre-biased Output Load  
Power Stage Input Voltage from 1V to 14V  
Control Stage Input Voltage from 3V to 6V  
Output Voltage Adjustable Down to 0.6V  
Power Good Flag and Shutdown  
Output Overvoltage and Undervoltage  
Detection  
•
±1.5% Feedback Voltage Accuracy Over  
Temperature  
The LM2745/8 features a fixed-frequency voltage-  
mode PWM control architecture which is adjustable  
from 50 kHz to 1 MHz with one external resistor. In  
addition, the LM2745 also allows the switching  
frequency to be synchronized to an external clock  
signal over the range of 250 kHz to 1 MHz. This wide  
range of switching frequency gives the power supply  
designer the flexibility to make better tradeoffs  
between component size, cost and efficiency.  
•
•
•
Low-side Adjustable Current Sensing  
Adjustable Soft-start  
Tracking and Sequencing with Shutdown and  
Soft Start Pins  
•
TSSOP-14 Package  
APPLICATIONS  
•
•
•
•
•
Down Conversion from 3.3V  
Cable Modem, DSL and ADSL  
Laser Jet and Ink Jet Printers  
Low Voltage Power Modules  
DSP, ASIC, Core and I/O  
Features include the ability to startup with a pre-  
biased load on the output, soft-start, input  
undervoltage lockout (UVLO) and Power Good  
(based on both undervoltage and overvoltage  
detection). In addition, the shutdown pin of the IC can  
be used for providing startup delay, and the soft-start  
pin can be used for implementing precise tracking, for  
the purpose of sequencing with respect to an external  
rail.  
Typical Application  
V
= 3.3V  
V
= 3.3V  
IN  
CC  
D
1
C
BOOT  
R
PULL-UP  
+
C
1,2  
R
C
IN  
CC  
Q1  
Q2  
V
HG  
CC  
LM2745  
SD  
BOOT  
R
CS  
L1  
CC  
V
= 1.2V@16A  
OUT  
I
PWGD  
SEN  
Clk  
FREQ/SYNC  
SS/TRACK  
SGND  
LG  
PGND  
PGND  
FB  
C
+
Clk  
R
FB2  
C
O
1,2  
R
FADJ  
C
SS  
EAO  
R
C
C3  
C2  
R
FB1  
C
C1  
C
C2  
R
C1  
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of  
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.  
All trademarks are the property of their respective owners.  
2
PRODUCTION DATA information is current as of publication date.  
Products conform to specifications per the terms of the Texas  
Instruments standard warranty. Production processing does not  
necessarily include testing of all parameters.  
Copyright © 2005–2013, Texas Instruments Incorporated  
 
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LM2745 替代型号

型号 品牌 替代类型 描述 数据表
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