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LTC3416

更新时间： 2024-11-12 14:57:27
品牌 Logo 应用领域
亚德诺 - ADI 稳压器
页数 文件大小 规格书
16页 213K
描述
具跟踪功能的 4A、4MHz、单片式同步降压型稳压器

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中文翻译

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LTC3416 数据手册

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LTC3416  
4A, 4MHz, Monolithic  
Synchronous Step-Down  
Regulator with Tracking  
U
FEATURES  
DESCRIPTIO  
The LTC®3416 is a high efficiency monolithic synchro-  
nous, step-down DC/DC converter utilizing a constant  
frequency, current mode architecture. It operates from an  
input voltage range of 2.25V to 5.5V and provides a  
regulated output voltage from 0.8V to 5V while delivering  
up to 4A of output current. The internal synchronous  
power switch with 67mΩ of on-resistance increases effi-  
ciency and eliminates the need for an external Schottky  
diode. Switching frequency is set by an external resistor.  
100% duty cycle provides low dropout operation extend-  
ingbatterylifeinportablesystems. OPTI-LOOP® compen-  
sation allows the transient response to be optimized over  
a wide range of loads and output capacitors.  
■
High Efficiency: Up to 95%  
■
4A Output Current  
■
Low RDS(ON) Internal Switch: 67mΩ  
■
Tracking Input to Provide Easy Supply Sequencing  
■
Programmable Frequency: 300kHz to 4MHz  
■
2.25V to 5.5V Input Voltage Range  
■
±2% Output Voltage Accuracy  
■
0.8V Reference Allows Low Output Voltage  
■
Low Dropout Operation: 100% Duty Cycle  
■
Power Good Output Voltage Monitor  
Overtemperature Protected  
■
■
Available in a 20-Lead Thermally Enhanced  
TSSOP Package  
TheLTC3416operatesinforcedcontinuousoperationand  
provides tracking of another power supply rail. Forced  
continuousoperationreducesnoiseandRFinterferenceand  
provides excellent transient response. Fault protection is  
provided by an overcurrent comparator, and adjustable  
compensationallowsthetransientresponsetobeoptimized  
over a wide range of loads and output capacitors.  
U
APPLICATIO S  
■
Portable Instruments  
■
Notebook Computers  
■
Distributed Power Systems  
■
Battery-Powered Equipment  
■
POL Board Power  
, LTC and LT are registered trademarks of Linear Technology Corporation. All other  
trademarks are the property of their respective owners. OPTI-LOOP is a registered trade-  
mark of Linear Technology Corporation. Protected by U.S. Patents including 5481178,  
6580258, 6304066, 6127815, 6498466, 6611131, 6724174.  
U
TYPICAL APPLICATIO  
V
OUT2  
I/O VOLTAGE  
2.5V  
100  
90  
V
IN  
2.5V TO 5.5V  
V
= 2.5V  
22µF  
IN  
80  
70  
SVIN PVIN  
R
PGOOD  
SW  
0.2µH  
T
V
= 3.3V  
V
1.8V  
4A  
OUT1  
IN  
127k  
60  
50  
LTC3416  
RUN/SS PGND  
SGND  
100µF  
×2  
40  
30  
20  
10  
0
I
TH  
TRACK  
V
FB  
7.5k  
820pF  
255k  
V
= 1.8V  
OUT  
f = 2MHz  
255k  
200k  
0.01  
0.10  
1
10  
3416 F01a  
LOAD CURRENT (A)  
200k  
3416 G09  
Figure 1a. 2.5V/4A Step-Down Regulator with Tracking  
Figure 1b. Efficiency vs Load Current  
3416fa  
1
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