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| 型号： | LT3973IDD#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 4/24页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK ADJ 0.75A 10DFN |
| 标准包装： | 121 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 1.21 V ~ 24 V |
| 输入电压： | 4.2 V ~ 42 V |
| PWM 型： | 电流模式，Burst Mode? |
| 频率 - 开关： | 195kHz ~ 2.15MHz |
| 电流 - 输出： | 750mA |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-WFDFN 裸露焊盘 |
| 包装： | 管件 |
| 供应商设备封装： | 10-DFN（3x3） |
LT3973/LT3973-3.3/LT3973-5
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T A = 25°C. V IN = 12V, V BD = 3.3V unless otherwise noted. (Note 2)
EN/UVLO Voltage Threshold
EN/UVLO Rising, V IN ≥ 4.2V
l
1.12
1.19
1.28
V
EN/UVLO Voltage Hysteresis
30
45
mV
PG Threshold Offset from Feedback Voltage
V FB Rising
6.5
10
13.5
%
PG Hysteresis as % of Output Voltage
0.8
%
PG Leakage
V PG = 3V
0.01
1
μA
PG Sink Current
V PG = 0.4V
l
220
350
μA
Minimum Switch On-Time
70
ns
Minimum Switch Off-Time (Note 5)
V IN = 10V
130
180
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
reliability and lifetime.
Note 2: The LT3973E is guaranteed to meet performance specifications
from 0°C to 125°C junction temperature. Specifications over the –40°C
to 125°C operating junction temperature range are assured by design,
characterization, and correlation with statistical process controls. The
LT3973I is guaranteed over the full –40°C to 125°C operating junction
temperature range. The LT3973H is guaranteed over the full –40°C to
150°C operating junction temperature range. High junction temperatures
degrade operating lifetimes. Operating lifetime is derated at junction
temperatures greater than 125°C. The junction temperature (T J , in °C) is
calculated from the ambient temperature (T A in °C) and power dissipation
(PD, in Watts) according to the formula:
Note 3: This is the minimum input voltage for operation with accurate FB
reference voltage.
Note 4: This is the minimum voltage across the boost capacitor needed to
guarantee full saturation of the switch.
Note 5: The LT3973 contains circuitry that extends the maximum duty
cycle if there is sufficient voltage across the boost capacitor. See the
Application Information section for more details.
Note 6: This IC includes overtemperature protection that is intended
to protect the device during momentary overload conditions. Junction
temperature will exceed the maximum operating junction temperature
when overtemperature protection is active. Continuous operation above
the specified maximum operating junction temperature may impair device
reliability or permanently damage the device.
T J = T A + (PD ? θ JA )
where θ JA (in °C/W) is the package thermal impedance.
3973fa
4
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