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| 型号： | LT3845EFE#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 3/26页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM CM 16TSSOP |
| 标准包装： | 95 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 500kHz |
| 电源电压： | 4 V ~ 60 V |
| 降压： | 是 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | -40°C ~ 125°C |
| 封装/外壳： | 16-TSSOP（0.173"，4.40mm）裸露焊盘 |
| 包装： | 管件 |
| 产品目录页面： | 1332 (CN2011-ZH PDF) |
LT3845
ELECTRICAL CHARACTERISTICS The l denotes the speci?cations which apply over the full operating
temperature range, otherwise speci?cations are at T A = 25°C. V IN = 20V, V CC = BOOST = BURST_EN = 10V, SHDN = 2V, R SET = 49.9kΩ,
SENSE – = SENSE + = 10V, SGND = PGND = SW = SYNC = 0V, unless otherwise noted.
PARAMETER
V IN Operating Voltage Range (Note 4)
V IN Minimum Start Voltage
V IN UVLO Threshold (Falling)
CONDITIONS
●
●
●
MIN
4
3.6
TYP
3.8
MAX
60
7.5
4
UNITS
V
V
V
V IN UVLO Threshold Hysteresis
670
mV
V IN Supply Current
V CC > 9V
20
μA
V IN Burst Mode Current
V IN Shutdown Current
BOOST Operating Voltage Range
BOOST Operating Voltage Range (Note 5)
BOOST UVLO Threshold (Rising)
BOOST UVLO Threshold Hysteresis
V BURST_EN = 0V, V FB = 1.35V
V SHDN = 0V
V BOOST – V SW
V BOOST – V SW
V BOOST – V SW
●
●
●
20
9
5
400
15
75
20
μA
μA
V
V
V
mV
BOOST Supply Current (Note 6)
1.4
mA
BOOST Burst Mode Current
BOOST Shutdown Current
V BURST_EN = 0V
V SHDN = 0V
0.1
0.1
μA
μA
V CC Operating Voltage Range (Note 5)
V CC Output Voltage
Over Full Line and Load Range
●
●
8
20
8.3
V
V
V CC UVLO Threshold (Rising)
V CC UVLO Threshold Hysteresis
6.25
500
V
mV
V CC Supply Current (Note 6)
V CC Burst Mode Current
V BURST_EN = 0V
●
3
100
3.7
mA
μA
V CC Shutdown Current
V CC Current Limit
V SHDN = 0V
●
–40
20
–150
μA
mA
Error Amp Reference Voltage
Measured at V FB Pin
●
1.224
1.215
1.231
1.238
1.245
V
V
V FB Pin Input Current
V FB = 1.231V
25
nA
SHDN Enable Threshold (Rising)
SHDN Threshold Hysteresis
●
1.3
1.35
120
1.4
V
mV
Sense Pins Common Mode Range
Current Limit Sense Voltage
Reverse Protect Sense Voltage
V SENSE+ – V SENSE–
V SENSE+ – V SENSE– , V BURST_EN = V CC
●
●
0
90
100
–100
36
115
V
mV
mV
Reverse Current Inhibit Offset
Input Current (I SENSE+ + I SENSE– )
V BURST_EN = 0V or V BURST_EN = V FB
V SENSE(CM) = 0V
V SENSE(CM) = 2V
V SENSE(CM) > 4V
10
800
–20
–300
mV
μA
μA
μA
Operating Frequency
●
270
300
330
kHz
Minimum Programmable Frequency
Maximum Programmable Frequency
●
●
500
100
kHz
kHz
External Sync Frequency Range
SYNC Input Resistance
●
100
40
600
kHz
kΩ
SYNC Voltage Threshold
Soft-Start Capacitor Control Current
●
1.4
2
2
V
μA
Error Amp Transconductance
●
270
340
410
μS
Error Amp DC Voltage Gain
Error Amp Sink/Source Current
62
±30
dB
μA
3845fd
3
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