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LTC7103-1

更新时间： 2023-12-20 18:46:34
品牌 Logo 应用领域
亚德诺 - ADI 稳压器
页数 文件大小 规格书
38页 2189K
描述
具有快速电流编程功能的105V、2.3A低EMI同步降压稳压器

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LTC7103-1 数据手册

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LTC7103-1  
105V, 2.3A Low EMI  
Synchronous Step-Down Regulator  
with Fast Current Programming  
DESCRIPTION  
FEATURES  
The LTC®7103-1 is a high efficiency, monolithic synchro-  
nous step-down DC/DC converter utilizing a constant  
frequency, average current mode control architecture. It  
operates from an input voltage range of 4.4V to 105V and  
provides an adjustable regulated output voltage from 1V  
n
Wide V Range: 4.4V to 105V (110V Abs Max)  
Ultralow EMI/EMC Emissions: CISPR 25 Compliant  
IN  
n
n
n
2µA I When Regulating 48V to 3.3V  
Q
IN  
OUT  
Fast and Accurate Output Current Programming and  
Monitoring with No External R  
Brick Wall Current Limit  
SENSE  
n
n
n
n
n
n
to V while delivering up to 2.3A of output current.  
IN  
Low Minimum On-Time: 40ns  
The LTC7103-1 features high frequency operation and a  
low minimum on-time that reduce inductor size and enable  
constant-frequency operation even at very high step-down  
ratios. In addition, the LTC7103-1 achieves the lowest  
possible dropout voltage with 100% maximum duty cycle  
operation. During light load operation, converter efficiency  
and output ripple can be optimized by selecting Burst  
Mode, pulse-skipping or forced continuous operation.  
Wide V  
Range: 1V to V  
OUT  
IN  
PassThru™/100% Duty Cycle Capable  
Programmable Fixed Frequency: 200kHz to 2MHz  
Eight, Pin-Selectable Fixed (1.2V to 15V) or  
Adjustable Output Voltages  
n
Selectable Continuous, Pulse-Skipping, or Low  
Ripple Burst Mode® Operation at Light Loads  
PLL Synchronization to External Clock  
n
n
n
n
n
n
The LTC7103-1 includes accurate, high speed average  
current programming and monitoring without the need  
for an external sense resistor. Additional features include  
a bypass LDO to maximize efficiency, fixed or adjustable  
output voltage and loop compensation, and a wide array  
of protection features to enhance reliability.  
EXTV LDO Powers Chip from V  
= 3.3V to 40V  
CC  
OUT  
OPTI-LOOP® or Fixed Internal Compensation  
Input and Output Overvoltage Protection  
Thermally Enhanced (5mm × 6mm) QFN Package  
AEC-Q100 Qualification in Process  
APPLICATIONS  
Compared to the LTC7103, the LTC7103-1 is pin com-  
patible, except that it also offers continuous inductor  
current mode.  
n
Battery Chargers and CC/CV Supplies  
n
Automotive and Military Systems  
Industrial, Avionics and Heavy Equipment  
n
All registered trademarks and trademarks are the property of their respective owners.  
n
Medical Instruments and Telecommunication  
TYPICAL APPLICATION  
Efficiency vs Load Current  
5V to 105V Input to 5V, 2.3A Output Step-Down Regulator  
100  
V
= 5V  
OUT  
95  
90  
85  
80  
75  
70  
65  
60  
55  
50  
V
IN  
V
BOOST  
IN  
5V TO 105V  
0.1µF  
4.7µF  
18µH  
V
LTC7103-1  
OUT  
5V  
RUN  
SW  
2.3A  
I
V
FB  
CTRL  
OVLO  
EXTV  
100µF  
CC  
CURRENT  
MONITOR  
I
V
PRG2  
MON  
f
= 300kHz  
SW  
FIGURE 14 CIRCUIT  
PLLIN/MODE  
FREQ  
I
TH  
V
V
V
V
= 12V  
= 24V  
= 48V  
= 72V  
IN  
IN  
IN  
IN  
INTV  
CC  
SGND  
PGND  
1µF  
71031 TA01a  
0.1  
1
10  
100  
1000  
LOAD CURRENT (mA)  
71031 TA01b  
Rev. 0  
1
Document Feedback  
For more information www.analog.com  
1234567...38

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