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参数资料
| 型号： | LT3757MPMSE#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 3/36页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR PWM CM 10-MSOP |
| 标准包装： | 2,500 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 1MHz |
| 电源电压： | 2.9 V ~ 40 V |
| 降压： | 无 |
| 升压： | 是 |
| 回扫： | 是 |
| 反相： | 是 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | -55°C ~ 125°C |
| 封装/外壳： | 10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 |
| 包装： | 带卷 (TR) |
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LT3757/LT3757A
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating temp-
erature range, otherwise specifications are at T A = 25°C. V IN = 24V, SHDN /UVLO = 24V, SENSE = 0V, unless otherwis e noted.
PARAMETER
V IN Operating Range
V IN Shutdown I Q
V IN Operating I Q
V IN Operating I Q with Internal LDO Disabled
SENSE Current Limit Threshold
SENSE Input Bias Current
CONDITIONS
SHDN /UVLO = 0V
SHDN /UVLO = 1.15V
V C = 0.3V, R T = 41.2k
V C = 0.3V, R T = 41.2k, INTV CC = 7.5V
Current Out of Pin
l
MIN
2.9
100
TYP
0.1
1.6
280
110
–65
MAX
40
1
6
2.2
400
120
UNITS
V
μA
μA
mA
μA
mV
μA
Error Amplifier
FBX Regulation Voltage (V FBX(REG) )
FBX Overvoltage Lockout
FBX Pin Input Current
V FBX > 0V (Note 3)
V FBX < 0V (Note 3)
V FBX > 0V (Note 4)
V FBX < 0V (Note 4)
V FBX = 1.6V (Note 3)
V FBX = –0.8V (Note 3)
l
l
1.569
–0.816
6
7
–10
1.6
–0.80
8
11
70
1.631
–0.784
10
14
100
10
V
V
%
%
nA
nA
Transconductance g m (?I VC /?V FBX )
V C Output Impedance
(Note 3)
(Note 3)
230
5
μS
MΩ
V FBX Line Regulation [?V FBX /(?V IN ? V FBX(REG) )]
V C Current Mode Gain (?V VC /?V SENSE )
V C Source Current
V C Sink Current
V FBX > 0V, 2.9V < V IN < 40V (Notes 3, 7)
V FBX < 0V, 2.9V < V IN < 40V (Notes 3, 7)
V FBX = 0V, V C = 1.5V
V FBX = 1.7V
V FBX = –0.85V
0.002
0.0025
5.5
–15
12
11
0.056
0.05
%/V
%/V
V/V
μA
μA
μA
Oscillator
Switching Frequency
RT Voltage
R T = 41.2k to GND, V FBX = 1.6V
R T = 140k to GND, V FBX = 1.6V
R T = 10.5k to GND, V FBX = 1.6V
V FBX = 1.6V
270
300
100
1000
1.2
330
kHz
kHz
kHz
V
Minimum Off-Time
Minimum On-Time
SYNC Input Low
SYNC Input High
1.5
220
220
0.4
ns
ns
V
V
SS Pull-Up Current
SS = 0V, Current Out of Pin
–10
μA
Low Dropout Regulator
INTV CC Regulation Voltage
INTV CC Undervoltage Lockout Threshold
INTV CC Overvoltage Lockout Threshold
INTV CC Current Limit
INTV CC Load Regulation (?V INTVCC / V INTVCC )
INTV CC Line Regulation ?V INTVCC /(V INTVCC ? ?V IN )
Dropout Voltage (V IN – V INTVCC )
INTV CC Current in Shutdown
Falling INTV CC
UVLO Hysteresis
V IN = 40V
V IN = 15V
0 < I INTVCC < 20mA, V IN = 8V
8V < V IN < 40V
V IN = 6V, I INTVCC = 20mA
SHDN /UVLO = 0V, INTV CC = 8V
l
7
2.6
16
30
–0.9
7.2
2.7
0.1
17.5
40
95
–0.5
0.008
400
16
7.4
2.8
55
0.03
V
V
V
V
mA
mA
%
%/V
mV
μA
3757afd
3
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