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LTC1143_15

更新时间： 2024-10-01 01:11:59
品牌 Logo 应用领域
凌特 - Linear /
页数 文件大小 规格书
20页 320K
描述
Dual High Efficiency SO-16 Step-Down Switching Regulator Controllers

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LTC1143_15 数据手册

 浏览型号LTC1143_15的Datasheet PDF文件第2页浏览型号LTC1143_15的Datasheet PDF文件第3页浏览型号LTC1143_15的Datasheet PDF文件第4页浏览型号LTC1143_15的Datasheet PDF文件第5页浏览型号LTC1143_15的Datasheet PDF文件第6页浏览型号LTC1143_15的Datasheet PDF文件第7页 
LTC1143/LTC1143L  
LTC1143L-ADJ  
Dual High Efficiency SO-16  
Step-Down Switching Regulator  
Controllers  
U
FEATURES  
DESCRIPTION  
■
TheLTC1143seriesisadualstep-downswitchingregulator  
controller featuring automatic Burst ModeTM operation to  
maintain high efficiencies at low output currents. This  
device is composed of two separate regulator blocks,  
each driving an external power MOSFET at switching  
frequenciesupto400kHzusingaconstantoff-timecurrent  
mode architecture. Both fixed and adjustable voltages are  
available.  
Dual Outputs  
LTC1143, LTC1143L: 3.3V, 5V  
LTC1143L-ADJ: Dual Adjustable  
Very High Efficiency: Over 95% Possible  
Current Mode Operation for Excellent Line and Load  
Transient Response  
High Efficiency Maintained over Three Decades of  
Output Current  
Low Standby Current at Light Loads: 160µA/Output  
Logic-Controlled Shutdown (LTC1143, LTC1143L)  
Wide VIN Range: 3.5V to 16V  
■
■
■
■
■
■
The operating current level for both regulators is user-  
programmable via an external current sense resistor.  
Wide input supply range allows operation from 4V to 14V  
(16V maximum). The LTC1143L and LTC1143L-ADJ  
extend operation to VIN = 3.5V. 100% duty cycle provides  
low dropout regulation limited only by the RDS(ON) of the  
external MOSFET and resistance of the inductor and  
current sense resistor.  
(LTC1143L, LTC1143L-ADJ)  
Very Low Dropout Operation: 100% Duty Cycle  
■
■
Available in NarrUow 16-Pin SO Package  
APPLICATIONS  
The LTC1143 series is ideal for applications requiring dual  
output voltages with high conversion efficiencies over a  
wide load current range in a small amount of board space.  
■
Personal Digital Assistants  
■
Notebook and Palmtop Computers  
■
Battery-Operated Digital Devices  
■
Portable Instruments  
, LTC and LT are registered trademarks of Linear Technology Corporation.  
Burst Mode is a trademark of Linear Technology Corporation.  
■
DC Power Distribution Systems  
U
V
TYPICAL APPLICATION  
IN  
4V TO 14V  
C
IN2  
+
C
+
IN1  
22µF  
25V  
× 2  
22µF  
25V  
× 2  
0.22µF  
P1A  
0.22µF  
P1B  
13  
5
V
V
IN1  
IN2  
4
1
12  
9
L2  
27µH  
L1  
27µH  
R
R
SENSE2  
0.05Ω  
SENSE1  
P-DRIVE 1  
P-DRIVE 2  
0.05Ω  
V
V
OUT1  
OUT2  
2.5V/2A  
3.3V/2A  
+
+
SENSE  
SENSE  
1
SENSE  
SENSE  
2
2
1000pF  
D1  
LTC1143L-ADJ  
1000pF  
D2  
–
–
1
C
R4  
OUT1  
+
R2  
82.5k  
1%  
8
16  
C
OUT2  
+
220µF  
10V  
49.9k  
1%  
220µF  
MBRS320T3  
MBRS320T3  
10V  
× 2  
V
FB2  
× 2  
V
FB1  
10  
2
R1  
R3  
49.9k  
1%  
C
T2  
6
GND1  
3
C
I
I
GND2  
11  
T1  
14  
TH2  
7
TH1  
15  
49.9k  
1%  
100pF  
100pF  
R
R
C2  
1k  
C1  
1k  
C
C
C
C
C1  
3300pF  
T1  
300pF  
C2  
3300pF  
T2  
300pF  
L1, L2: SUMIDA CDRH125-270  
P1: SILICONIX Si4953DY/FAIRCHILD NDS8947  
: DALE WSL-2010-.05  
R
R
SENSE1, SENSE2  
1143 F01  
Figure 1. High Efficiency Dual 3.3V/2.5V Regulator  
1
1234567...20

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