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参数资料
| 型号： | LT3757MPMSE#PBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING REGULATOR, 1000 kHz SWITCHING FREQ-MAX, PDSO10 |
| 封装： | 3 X 3 MM, LEAD FREE, PLASTIC, MSOP-10 |
| 文件页数： | 23/36页 |
| 文件大小： | 436K |
| 代理商： | LT3757MPMSE#PBF |
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LT3757
3
3757fc
elecTrical characTerisTics The
l
denotes the specifications which apply over the full operating temp-
erature range, otherwise specifications are at TA = 25°C. VIN = 24V, SHDN/UVLO = 24V, SENSE = 0V, unless otherwise noted.
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
VIN Operating Range
2.9
40
V
VIN Shutdown IQ
SHDN/UVLO = 0V
SHDN/UVLO = 1.15V
0.1
1
6
A
VIN Operating IQ
VC = 0.3V, RT = 41.2k
1.6
2.2
mA
VIN Operating IQ with Internal LDO Disabled
VC = 0.3V, RT = 41.2k, INTVCC = 7.5V
280
400
A
SENSE Current Limit Threshold
l
100
110
120
mV
SENSE Input Bias Current
Current Out of Pin
–65
A
Error Amplifier
FBX Regulation Voltage (VFBX(REG))
VFBX > 0V (Note 3)
VFBX < 0V (Note 3)
l
1.569
–0.816
1.6
–0.80
1.631
–0.784
V
FBX Overvoltage Lockout
VFBX > 0V (Note 4)
VFBX < 0V (Note 4)
6
7
8
11
10
14
%
FBX Pin Input Current
VFBX = 1.6V (Note 3)
VFBX = –0.8V (Note 3)
–10
70
100
10
nA
Transconductance gm (IVC/VFBX)
(Note 3)
230
S
VC Output Impedance
(Note 3)
5
MΩ
VFBX Line Regulation [VFBX/(VIN VFBX(REG))]
VFBX > 0V, 2.9V < VIN < 40V (Notes 3, 7)
VFBX < 0V, 2.9V < VIN < 40V (Notes 3, 7)
0.002
0.0025
0.056
0.05
%/V
VC Current Mode Gain (VVC/VSENSE)
5.5
V/V
VC Source Current
VFBX = 0V, VC = 1.5V
–15
A
VC Sink Current
VFBX = 1.7V
VFBX = –0.85V
12
11
A
Oscillator
Switching Frequency
RT = 41.2k to GND, VFBX = 1.6V
RT = 140k to GND, VFBX = 1.6V
RT = 10.5k to GND, VFBX = 1.6V
270
300
100
1000
330
kHz
RT Voltage
VFBX = 1.6V
1.2
V
Minimum Off-Time
220
ns
Minimum On-Time
220
ns
SYNC Input Low
0.4
V
SYNC Input High
1.5
V
SS Pull-Up Current
SS = 0V, Current Out of Pin
–10
A
Low Dropout Regulator
INTVCC Regulation Voltage
l
7
7.2
7.4
V
INTVCC Undervoltage Lockout Threshold
Falling INTVCC
UVLO Hysteresis
2.6
2.7
0.1
2.8
V
INTVCC Overvoltage Lockout Threshold
16
17.5
V
INTVCC Current Limit
VIN = 40V
VIN = 15V
30
40
95
55
mA
INTVCC Load Regulation (VINTVCC/VINTVCC)
0 < IINTVCC < 20mA, VIN = 8V
–0.9
–0.5
%
INTVCC Line Regulation VINTVCC/(VINTVCC VIN)
8V < VIN < 40V
0.008
0.03
%/V
Dropout Voltage (VIN – VINTVCC)
VIN = 6V, IINTVCC = 20mA
400
mV
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