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参数资料
| 型号： | LT3682IDD#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 19/24页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK ADJ 1A 12DFN |
| 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： | 0.8 V ~ 20 V |
| 输入电压： | 3.6 V ~ 36 V |
| PWM 型： | 电流模式，混合 |
| 频率 - 开关： | 250kHz ~ 2.2MHz |
| 电流 - 输出： | 1A |
| 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： | 12-WFDFN 裸露焊盘 |
| 包装： | 管件 |
| 供应商设备封装： | 12-DFN |
LT3682
APPLICATIONS INFORMATION
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 6 shows a plot of minimum load
to start and to run as a function of input voltage. In many
6
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 discontinuous 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
5.5
5
4.5
4
3.5
TO START
(WORST CASE)
TO RUN
duty cycle of the LT3682, requiring a higher input voltage
to maintain regulation.
Soft-Start
The RUN/SS pin can be used to soft-start the LT3682,
reducing the maximum input current during start-up. The
3
2.5
2
1
V OUT = 3.3V
T A = 25?C
L = 10μH
f = 800kHz
10 100
LOAD CURRENT (mA)
1000
RUN/SS pin is driven through an external RC network to
create a voltage ramp at this pin. Figure 7 shows the startup
and shut-down 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
8
7.5
7
6.5
6
5.5
TO START
(WORST CASE)
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.
5 TO RUN
4.5
V RUN
5V/DIV
4
3.5
3
V OUT = 5V
T A = 25?C
RUN
15k
RUN/SS
V RUN/SS
5V/DIV
2.5
L = 10μH
f = 800kHz
0.22μF
GND
V OUT
5V/DIV
2
1
10 100
1000
I L
LOAD CURRENT(mA)
3682 F06
1A/DIV
5ms/DIV
3682 F07
Figure 6. The Minimum Input Voltage Depends on
Output Voltage, Load Current and Boost Circuit
Figure 7. To Soft-Start the LT3682, Add a
Resistor and Capacitor to the RUN/SS Pin
3682f
19
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相关代理商/技术参数 |
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| LT3682IDD-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:1A Micropower Step-Down |
| LT3684 | 制造商:LINER 制造商全称:Linear Technology 功能描述:36V, 2A, 2.8MHz Step-Down Switching Regulator |
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| LT3684EDD#PBF | 功能描述:IC REG BUCK ADJ 2A 10DFN 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 |
| LT3684EDD#PBF | 制造商:Linear Technology 功能描述:DC-DC CONVERTER BUCK 2.8MHZ 制造商:Linear Technology 功能描述:DC-DC CONVERTER, BUCK, 2.8MHZ, DFN-10 |
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