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参数资料
| 型号： | LT3845AMPFE#TRPBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封装： | 4.40 MM, LEAD FREE, PLASTIC, TSSOP-16 |
| 文件页数： | 20/26页 |
| 文件大小： | 284K |
| 代理商： | LT3845AMPFE#TRPBF |
LT3845A
3
3845afa
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
VIN Operating Voltage Range (Note 4)
VIN Minimum Start Voltage
VIN UVLO Threshold (Falling)
VIN UVLO Threshold Hysteresis
l
4
3.6
3.8
670
60
7.5
4
V
mV
VIN Supply Current
VIN Burst Mode Current
VIN Shutdown Current
VCC > 9V
VBURST_EN = 0V, VFB = 1.35V
VSHDN = 0V
l
20
9
15
A
BOOST Operating Voltage Range
BOOST Operating Voltage Range (Note 5)
BOOST UVLO Threshold (Rising)
BOOST UVLO Threshold Hysteresis
VBOOST – VSW
l
5
400
75
20
V
mV
BOOST Supply Current (Note 6)
BOOST Burst Mode Current
BOOST Shutdown Current
VBURST_EN = 0V
VSHDN = 0V
1.4
0.1
mA
A
VCC Operating Voltage Range (Note 5)
VCC Output Voltage
VCC UVLO Threshold (Rising)
VCC UVLO Threshold Hysteresis
Over Full Line and Load Range
l
8
6.25
500
20
8.3
V
mV
VCC Supply Current (Note 6)
VCC Burst Mode Current
VCC Shutdown Current
VCC Current Limit
VBURST_EN = 0V
VSHDN = 0V
l
–40
3
100
20
–150
3.7
mA
A
mA
Error Amp Reference Voltage
Measured at VFB Pin
l
1.224
1.215
1.231
1.238
1.245
V
VFB Pin Input Current
VFB = 1.231V
25
nA
SHDN Enable Threshold (Rising)
SHDN Threshold Hysteresis
l
1.3
1.35
120
1.4
V
mV
Sense Pins Common Mode Range
Current Limit Sense Voltage
Reverse Protect Sense Voltage
Reverse Current Inhibit Offset
VSENSE+ – VSENSE–
VSENSE+ – VSENSE–, VBURST_EN = VCC
VBURST_EN = 0V or VBURST_EN = VFB
l
0
90
100
–100
10
36
115
V
mV
Input Current (ISENSE+ + ISENSE–)
VSENSE(CM) = 0V
VSENSE(CM) = 2V
VSENSE(CM) > 4V
800
–20
–300
A
Operating Frequency
l
270
300
330
kHz
Minimum Programmable Frequency
Maximum Programmable Frequency
l
500
100
kHz
External Sync Frequency Range
l
100
600
kHz
SYNC Input Resistance
40
kΩ
SYNC Voltage Threshold
l
1.4
2
V
Soft-Start Capacitor Control Current
2
A
Error Amp Transconductance
l
270
340
410
S
Error Amp DC Voltage Gain
62
dB
Error Amp Sink/Source Current
±30
A
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = 20V, VCC = BOOST = BURST_EN = 10V, SHDN = 2V, RSET = 49.9k,
SENSE– = SENSE+ = 10V, SGND = PGND = SW = SYNC = 0V, unless otherwise noted.
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