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| 型号： | LTC3704IMS#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 3/28页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR INV PWM CM 10-MSOP |
| 标准包装： | 50 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 1MHz |
| 占空比： | 97% |
| 电源电压： | 2.5 V ~ 36 V |
| 降压： | 无 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 是 |
| 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： | 10-TFSOP，10-MSOP（0.118"，3.00mm 宽） |
| 包装： | 管件 |
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LTC3704
ELECTRICAL CHARACTERISTICS
The ● denotes specifications which apply over the full operating temperature range, otherwise specifications are at T A = 25 ° C.
V IN = V INTVCC = 5V, V RUN = 1.5V, R FREQ = 80k, V MODE/SYNC = 0V, unless otherwise specified.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Oscillator
f OSC
Oscillator Frequency
R FREQ = 80k
250
300
350
kHz
Oscillator Frequency Range
50
1000
kHz
D MAX
f SYNC/ f OSC
Maximum Duty Cycle
Recommended Maximum Synchronized
f OSC = 300kHz (Note 6)
87
92
1.25
97
1.30
%
Frequency Ratio
t SYNC(MIN)
t SYNC(MAX)
V IL(MODE)
V IH(MODE)
R MODE/SYNC
V FREQ
MODE/SYNC Minimum Input Pulse Width
MODE/SYNC Maximum Input Pulse Width
Low Level MODE/SYNC Input Voltage
High Level MODE/SYNC Input Voltage
MODE/SYNC Input Pull-Down Resistance
Nominal FREQ Pin Voltage
V SYNC = 0V to 5V
V SYNC = 0V to 5V
1.2
25
0.8/f OSC
50
0.62
0.3
ns
ns
V
V
k Ω
V
Low Dropout Regulator
V INTVCC
Δ V INTVCC
Δ V IN1
Δ V INTVCC
Δ V IN2
V LDO(LOAD)
V DROPOUT
I INTVCC
INTV CC Regulator Output Voltage
INTV CC Regulator Line Regulation
INTV CC Regulator Line Regulation
INTV CC Load Regulation
INTV CC Regulator Dropout Voltage
Bootstrap Mode INTV CC Supply
V IN = 7.5V
7.5V ≤ V IN ≤ 15V
15V ≤ V IN ≤ 30V
V IN = 7.5V, 0 ≤ I INTVCC ≤ 20mA
V INTVCC = Open, INTV CC Load = 20mA
RUN = 0V, SENSE = 5V
5.0
–2
5.2
8
70
– 0.2
280
10
5.4
25
200
20
V
mV
mV
%
mV
μ A
Current in Shutdown
GATE Driver
t r
t f
GATE Driver Output Rise Time
GATE Driver Output Fall Time
C L = 3300pF (Note 7)
C L = 3300pF (Note 7)
17
8
100
100
ns
ns
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
reliabilty and lifetime.
Note 2: The LTC3704E is guaranteed to meet performance specifications
from 0 ° C to 85 ° C. Specifications over the – 40 ° C to 85 ° C operating
temperature range are assured by design, characterization and correlation
with statistical process controls. The LTC3704I is guaranteed 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:
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 LTC3704 is tested in a feedback loop that servos V NFB to the
reference voltage with the I TH pin forced to a voltage between 0V and 1.4V
(the no load to full load operating voltage range for the I TH pin is 0.3V to
1.23V).
Note 6: In a synchronized application, the internal slope compensation
gain is increased by 25%. Synchronizing to a significantly higher ratio will
reduce the effective amount of slope compensation, which could result in
subharmonic oscillation for duty cycles greater than 50%.
Note 7: Rise and fall times are measured at 10% and 90% levels.
T J = T A + (P D ? 120 ° C/W)
3704fb
3
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