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| 型号： | LT3684EDD#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 15/24页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK ADJ 2A 10DFN |
| 标准包装： | 2,500 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 1.27 V ~ 20 V |
| 输入电压： | 3.6 V ~ 34 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 300kHz ~ 3MHz |
| 电流 - 输出： | 2A |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-WFDFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 10-DFN（3x3） |
LT3684
APPLICATIONS INFORMATION
BD
BOOST
V OUT
6.0
5.5
TO START
V IN
V IN
LT3684
C3
5.0
4.5
4.7 μ F
GND
SW
4.0
TO RUN
3.5
(4a) For V OUT > 2.8V
3.0
2.5
2.0
V OUT = 3.3V
T A = 25 ° C
L = 4.7 μ H
f = 800kHz
V OUT
0.001
0.01
0.1
1
10
BD
BOOST
D2
8.0
LOAD CURRENT (A)
V IN
V IN
LT3684
C3
TO START
7.0
4.7 μ F
GND
SW
6.0
5.0
TO RUN
(4b) For 2.5V < V OUT < 2.8V
4.0
BD
V OUT
3.0
2.0
V OUT = 5V
T A = 25 ° C
L = 4.7 μ H
f = 800kHz
BOOST
0.001
0.01
0.1
1
10
V IN
V IN
LT3684
C3
LOAD CURRENT (A)
3684 F05
4.7 μ F
GND
SW
Figure 5. The Minimum Input Voltage Depends on
Output Voltage, Load Current and Boost Circuit
3684 FO4
voltage. In many cases the discharged output capacitor
(4c) For V OUT < 2.5V
Figure 4. Three Circuits For Generating The Boost Voltage
proper start-up, the minimum input voltage is also limited
by the boost circuit. If the input voltage is ramped slowly,
or the LT3684 is turned on with its RUN/SS pin when the
output is already in regulation, then the boost capacitor
may not be fully charged. Because the boost capacitor is
charged with the energy stored in the inductor, the circuit
will rely on some minimum load current to get the boost
circuit running properly. This minimum load will depend
on input and output voltages, and on the arrangement of
the boost circuit. The minimum load generally goes to
zero once the circuit has started. Figure 5 shows a plot
of minimum load to start and to run as a function of input
will present a load to the switcher and the minimum input
to start will be the same as the minimum input to run.
This occurs, for example, if RUN/SS is asserted after V IN
is applied. 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
300mV above V OUT . At higher load currents, the inductor
current is continuous and the duty cycle is limited by the
maximum duty cycle of the LT3684, requiring a higher
input voltage to maintain regulation.
3684f
15
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相关代理商/技术参数 |
参数描述 |
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| LT3684EMSE | 制造商:LINER 制造商全称:Linear Technology 功能描述:36V, 2A, 2.8MHz Step-Down Switching Regulator |
| LT3684EMSE#PBF | 功能描述:IC REG BUCK ADJ 2A 10MSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:250 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V 输入电压:2.05 V ~ 6 V PWM 型:电压模式 频率 - 开关:2MHz 电流 - 输出:500mA 同步整流器:是 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:6-UFDFN 包装:带卷 (TR) 供应商设备封装:6-SON（1.45x1） 产品目录页面:1032 (CN2011-ZH PDF) 其它名称:296-25628-2 |
| LT3684EMSE#PBF | 制造商:Linear Technology 功能描述:Switching Regulator IC 制造商:Linear Technology 功能描述:IC, STEP-DOWN REGULATOR, MSOP-10 |
| LT3684EMSE#TRPBF | 功能描述:IC REG BUCK ADJ 2A 10MSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:2,500 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V，1.5V，1.8V，2.5V 输入电压:2.7 V ~ 20 V PWM 型:- 频率 - 开关:- 电流 - 输出:50mA 同步整流器:是 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:带卷 (TR) 供应商设备封装:10-MSOP 裸露焊盘 |
| LT3684EMSEPBF | 制造商:Linear Technology 功能描述:36V/2A Buck(non BurstMode LT3481) LT3684 |
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