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| 型号： | LT3972IMSE#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 15/24页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK ADJ 3.5A 10MSOP |
| 标准包装： | 50 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 0.79 V ~ 30 V |
| 输入电压： | 3.6 V ~ 33 V |
| PWM 型： | 电流模式，Burst Mode? |
| 频率 - 开关： | 230kHz ~ 2.45MHz |
| 电流 - 输出： | 3.5A |
| 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-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 |
| 包装： | 管件 |
| 供应商设备封装： | 10-MSOP 裸露焊盘 |
LT3972
APPLICATIONS INFORMATION
V OUT
6.0
BD
5.5
TO START
V IN
V IN
BOOST
LT3972
C3
5.0
(WORST CASE)
4.5
4.7μF
GND
SW
4.0
TO RUN
3.5
3.0
V OUT = 3.3V
(5a) For V OUT > 2.8V
2.5
2.0
T A = 25°C
L = 8.2μH
f = 700kHz
BD
D2
V OUT
1
10
100 1000
LOAD CURRENT (mA)
10000
BOOST
8.0
V IN
V IN
LT3972
C3
7.0
TO START
4.7μF
GND
SW
6.0
(WORST CASE)
5.0
TO RUN
(5b) For 2.5V < V OUT < 2.8V
4.0
V OUT
3.0
V OUT = 5V
T A = 25°C
L = 8.2μH
BD
BOOST
2.0
1
f = 700kHz
10
100 1000
10000
V IN
V IN
LT3972
C3
LOAD CURRENT (mA)
3972 F06
4.7μF
GND
SW
Figure 6. The Minimum Input Voltage Depends on
Output Voltage, Load Current and Boost Circuit
3972 FO5
current is continuous and the duty cycle is limited by the
(5c) For V OUT < 2.5V; V IN(MAX) = 30V
Figure 5. Three Circuits For Generating The Boost Voltage
of minimum load to start and to run as a function of input
voltage. In many cases the discharged output capacitor
will present a load to the switcher, which will allow it to
start. The plots show the worst-case situation where V IN
is ramping very slowly. For lower start-up voltage, the
boost diode can be tied to V IN ; however, this restricts the
input range to one-half of the absolute maximum rating
of the BOOST pin.
At light loads, the inductor current becomes discontinu-
ous and the effective duty cycle can be very high. This
reduces the minimum input voltage to approximately
maximum duty cycle of the LT3972, requiring a higher
input voltage to maintain regulation.
Soft-Start
The RUN/SS pin can be used to soft-start the LT3972,
reducing the maximum input current during start-up.
The RUN/SS pin is driven through an external RC ?lter to
create a voltage ramp at this pin. Figure 7 shows the start-
up and shutdown waveforms with the soft-start circuit.
By choosing a large RC time constant, the peak start-up
current can be reduced to the current that is required to
regulate the output, with no overshoot. Choose the value
of the resistor so that it can supply 20μA when the RUN/SS
pin reaches 2.5V.
300mV above V OUT . At higher load currents, the inductor
3972fa
15
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