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LTC3895 PDF预览

LTC3895

更新时间: 2023-12-20 18:43:59
品牌 Logo 应用领域
亚德诺 - ADI 控制器
页数 文件大小 规格书
38页 2232K
描述
150V、低 IQ、同步降压型 DC/DC 控制器

LTC3895 数据手册

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LTC3895  
elecTrical characTerisTics The l denotes the specifications which apply over the specified operating  
junction temperature range, otherwise specifications are at TA = 25°C (Note 2), VIN = 12V, VRUN = 5V, VEXTVCC = 0V, VDRVSET = 0V,  
VPRG = FLOAT unless otherwise noted.  
SYMBOL  
PARAMETER  
CONDITIONS  
MIN  
4
TYP  
MAX  
140  
60  
UNITS  
l
V
V
V
Input Supply Operating Voltage Range (Note 10) DRVUV = 0V  
Regulated Output Voltage Set Point  
V
V
IN  
0.8  
OUT  
FB  
Regulated Feedback Voltage  
Feedback Current  
(Note 4); ITH Voltage = 1.2V  
0°C to 85°C, VPRG = FLOAT  
VPRG = FLOAT  
VPRG = 0V  
VPRG = INTV  
0.792  
0.788  
3.220  
4.875  
0.800  
0.800  
3.300  
5.000  
0.808  
0.812  
3.380  
5.125  
V
V
V
V
l
l
l
CC  
I
FB  
(Note 4)  
VPRG = FLOAT  
–0.006  
4
0.050  
6
µA  
µA  
VPRG = 0V or INTV  
CC  
Reference Voltage Line Regulation  
Output Voltage Load Regulation  
(Note 4) V = 4.5V to 150V  
0.002  
0.02  
%/V  
IN  
(Note 4) Measured in Servo Loop,  
∆ITH Voltage = 1.2V to 0.7V  
l
l
0.01  
0.1  
%
(Note 4) Measured in Servo Loop,  
∆ITH Voltage = 1.2V to 1.6V  
–0.01  
2.2  
–0.1  
%
g
m
Transconductance Amplifier gm  
Input DC Supply Current  
(Note 4) ITH = 1.2V, Sink/Source 5µA  
mmho  
I
(Note 5) V  
= 0V  
DRVSET  
Q
Pulse Skip or Forced Continuous Mode V = 0.83V (No Load)  
2.5  
40  
10  
mA  
µA  
µA  
FB  
Sleep Mode  
V
= 0.83V (No Load)  
55  
20  
FB  
Shutdown  
RUN = 0V  
UVLO  
Undervoltage Lockout  
DRV Ramping Up  
CC  
l
l
DRVUV = 0V  
4.0  
7.5  
4.2  
7.8  
V
V
DRVUV = INTV , DRVSET = INTV  
CC  
CC  
DRV Ramping Down  
CC  
l
l
DRVUV = 0V  
3.6  
6.4  
3.8  
6.7  
4.0  
7.0  
V
V
DRVUV = INTV , DRVSET = INTV  
CC  
CC  
l
V
V
ON  
RUN Pin ON Threshold  
V
V
Rising  
1.1  
1.2  
80  
1.3  
V
mV  
V
RUN  
RUN  
Hyst RUN Pin Hysteresis  
Overvoltage Lockout Threshold  
RUN  
l
OVLO  
Rising  
1.1  
1.2  
100  
1
1.3  
OVLO  
OVLO Hyst OVLO Hysteresis  
OVLO Delay  
mV  
µs  
Feedback Overvoltage Protection  
Measured at V , Relative to Regulated V  
7
10  
13  
1
%
FB  
FB  
+
I
I
+
SENSE Pin Current  
µA  
SENSE  
SENSE Pin Current  
SENSE < V  
– 0.5V  
+ 0.5V  
1
µA  
µA  
SENSE  
INTVCC  
INTVCC  
SENSE > V  
850  
99  
Maximum Duty Factor  
In Dropout  
CPUMP_EN = 0V, FREQ = 0V  
98  
100  
%
CPUMP_EN = INTV  
CC  
I
Soft-Start Charge Current  
V
V
= 0V  
8
10  
12  
µA  
SS  
SS  
V
Maximum Current Sense Threshold  
= 0.7V, V  
– = 3.3V  
SENSE(MAX)  
FB  
SENSE  
l
l
l
ILIM = FLOAT  
ILIM = 0V  
66  
43  
90  
75  
50  
100  
84  
57  
109  
mV  
mV  
mV  
ILIM = INTV  
CC  
3895fa  
3
For more information www.linear.com/LTC3895  

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