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LTC1265-3.3 PDF预览

LTC1265-3.3

更新时间： 2022-11-27 02:41:25
品牌 Logo 应用领域
凌特 - Linear 转换器
页数 文件大小 规格书
16页 230K
描述
1.2A, High Efficiency Step-Down DC/DC Converter

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LTC1265-3.3 数据手册

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LTC1265/LTC1265-3.3/LTC1265-5  
ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over the full operating  
temperature range, otherwise specifications are at TA = 25°C. VIN = 10V, VSHDN = 0V, unless otherwise specified.  
SYMBOL  
PARAMETER  
CONDITIONS  
MIN  
TYP  
MAX  
UNITS  
V
V
Shutdown Pin High  
Shutdown Pin Low  
Shutdown Pin Input Current  
Min Voltage at Pin 10 for Device to be in Shutdown  
Max Voltage at Pin 10 for Device to be Active  
1.2  
V
V
IH  
IL  
0.6  
0.5  
I
V
= 8V  
SHDN  
µA  
10  
Note 3: Dynamic supply current is higher due to the gate charge being  
delivered at the switching frequency.  
Note 1: Absolute Maximum Ratings are those values beyond which the life  
of the device may be impaired.  
Note 4: In applications where R  
off time increases by approximately 40%.  
is placed at ground potential, the  
Note 2: T is calculated from the ambient temperature T and power  
SENSE  
J
A
dissipation P according to the following formulas:  
D
LTC1265CS, LTC1265CS-3.3, LTC1265CS-5:  
T = T + (P • 110°C/W)  
J
A
D
W
U
TYPICAL PERFORMANCE CHARACTERISTICS  
Efficiency vs Input Voltage  
(VOUT = 5V)  
Efficiency vs Input Voltage  
(VOUT = 3.3V)  
Efficiency vs Load Current  
100  
98  
96  
94  
92  
90  
88  
86  
84  
82  
80  
100  
98  
96  
94  
92  
90  
88  
86  
84  
82  
80  
100  
95  
90  
85  
80  
75  
70  
LTC1265-3.3  
R
= 0.1Ω  
SENSE  
T
COIL = CTX33-4  
C
= 130pF  
V
= 5V  
IN  
I
= 250mA  
LOAD  
V
= 9V  
IN  
I
= 250mA  
LOAD  
I
= 800mA  
LOAD  
V
= 12V  
IN  
LTC1265-3.3  
= 3.3V  
I
= 800mA  
LOAD  
V
R
OUT  
LTC1265-5  
R = 0.1Ω  
SENSE  
= 0.1Ω  
SENSE  
T
C
= 130pF  
C = 130pF  
T
COIL = CTX33-4  
COIL = CTX33-4  
0.01  
0.10  
1.00  
11  
11  
4
5
6
7
8
9
10  
12 13  
4
5
6
7
8
9
10  
12 13  
LOAD CURRENT (A)  
INPUT VOLTAGE (V)  
INPUT VOLTAGE (V)  
1265 G01  
1265 G02  
LTC1265 G03  
Operating Frequency  
vs (VIN – VOUT  
Switch Leakage Current  
Switch Resistance  
)
0.9  
0.8  
0.7  
0.6  
0.5  
0.4  
0.3  
0.2  
0.1  
1.2  
1.0  
0.8  
0.6  
0.4  
0.2  
0
300  
270  
V
= 12V  
IN  
0°C  
25°C  
240  
210  
70°C  
T = 125°C  
J
180  
150  
T = 70°C  
J
120  
90  
60  
30  
0
T = 25°C  
J
T = 0°C  
J
0
0
1
2
3
4
5
6
7
8
9
10  
3
10 11 12 13  
INPUT VOLTAGE (V)  
4
5
6
7
8
9
0
20  
40  
60  
80  
100  
(V  
–
V
) VOLTAGE (V)  
OUT  
IN  
TEMPERATURE (°C)  
1265 G04  
1265 G05  
1265 G06  
3
1234567...16

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