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参数资料
| 型号： | LTC3873ITS8-5#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 3/16页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BST FLYBK TSOT23-8 |
| 标准包装： | 2,500 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 240kHz |
| 占空比： | 84% |
| 电源电压： | 4 V ~ 75 V |
| 降压： | 无 |
| 升压： | 是 |
| 回扫： | 是 |
| 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： | SOT-23-8 薄型，TSOT-23-8 |
| 包装： | 带卷 (TR) |
LTC3873-5
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 CC = 5V unless otherwise noted. (Note 2)
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Input DC Supply Current
Typicals at V CC = 5V (Note 4)
Normal Operation
Shutdown
UVLO
V ITH = 1.9V
V RUN/SS = 0V
V CC = UVLO Threshold – 100mV, V RUN/SS = V CC
300
50
35
400
80
50
μA
μA
μA
Undervoltage Lockout Threshold
Shutdown Threshold (at RUN/SS)
Regulated Feedback Voltage
V CC Rising
V CC Falling
V CC Hysteresis
V RUN/SS Falling
V RUN/SS Rising
(Note 5)
l
l
l
l
l
3.8
2.5
0.9
0.5
0.6
1.182
4.1
2.9
1.25
0.7
0.8
1.2
4.4
3.3
1.7
0.9
1.0
1.218
V
V
V
V
V
V
Feedback Voltage Line Regulation
Feedback Voltage Load Regulation
3.5V < V CC < 9V (Note 5)
V ITH = 1.6V (Note 5)
V ITH = 1V (Note 5)
0.1
0.05
–0.05
mV/V
%
%
V FB Input Current
(Note 5)
25
50
nA
RUN/SS Pull Up Current
V RUN/SS = 0V
1.5
3
4.5
μA
Maximum Duty Cycle
I SLMAX , Peak Slope Compensation Current
Oscillator Frequency
Gate Drive Rise Time
Gate Drive Fall Time
V RUN/SS = 1.3V
C LOAD = 3000pF (Note 6)
C LOAD = 3000pF (Note 6)
5
70
160
15
78
20
200
40
40
25
84
240
μA
%
μA
kHz
ns
ns
Peak Current Sense Voltage
V IN Shunt Regulator Voltage
IPRG = GND
IPRG = Float
IPRG = V IN
I IN = 1mA, I IN = 25mA, V RUN/SS = 0V
l
l
l
l
95
165
265
9
110
185
295
9.3
125
210
325
9.6
mV
mV
mV
V
Default Internal Soft-Start
3.3
ms
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: The LTC3873E-5 is guaranteed to meet performance speci?cations
from 0°C to 85°C. Speci?cations over the –40°C to 85°C operating
temperature range are assured by design, characterization and correlation
with statistical process controls. The LTC3873I-5 is guaranteed to meet
performance speci?cations over the full –40°C to 125°C operating
temperature range.
Note 3: T J is calculated from the ambient temperature T A and power
dissipation P D according to the following formula:
T J = T A + (P D ? θ JA )
Note 4: The dynamic input supply current is higher due to power MOSFET
gate charging (Q G ? f OSC ). See Applications Information.
Note 5: The LTC3873-5 is tested in a feedback loop which servos V FB to
the reference voltage with the I TH pin forced to the midpoint of its voltage
range (0.7V ≤ V ITH ≤ 1.9V, midpoint = 1.3V).
Note 6: Rise and fall times are measured at 10% and 90% levels.
V CC = 5.6V.
38735fb
3
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