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參數資料
| 型號： | LT3682EDD#TRPBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING REGULATOR, PDSO12 |
| 封裝： | 3 X 3 MM, LEAD FREE, PLASTIC, DFN-12 |
| 文件頁數： | 11/24頁 |
| 文件大小： | 253K |
| 代理商： | LT3682EDD#TRPBF |
LT3682
19
3682f
APPLICATIONS INFORMATION
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 VIN is ramping very slowly.
For lower start-up voltage, the boost diode can be tied to
VIN; 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
VOUT. At higher load currents, the inductor current is
continuous and the duty cycle is limited by the maximum
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
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
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.
5ms/DIV
VRUN/SS
5V/DIV
VOUT
5V/DIV
IL
1A/DIV
VRUN
5V/DIV
3682 F07
RUN/SS
RUN
GND
15k
0.22μF
Figure 7. To Soft-Start the LT3682, Add a
Resistor and Capacitor to the RUN/SS Pin
LOAD CURRENT (mA)
INPUT
VOL
TAGE
(V)
1
4.5
5
5.5
1000
3.5
4
3
2.5
2
10
100
10
100
6
LOAD CURRENT(mA)
INPUT
VOL
TAGE
(V)
3682 F06
1
6
6.5
7
7.5
1000
4.5
4
5.5
5
3.5
2.5
3
2
8
TO RUN
TO START
(WORST CASE)
VOUT = 3.3V
TA = 25C
L = 10μH
f = 800kHz
TO START
(WORST CASE)
TO RUN
VOUT = 5V
TA = 25C
L = 10μH
f = 800kHz
Figure 6. The Minimum Input Voltage Depends on
Output Voltage, Load Current and Boost Circuit
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
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相關代理商/技術參數 |
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| LT3682IDD#PBF | 功能描述:IC REG BUCK ADJ 1A 12DFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關穩(wěn)壓器 系列:- 產品培訓模塊:MIC23xxx HyperLight Load™ Regulators 標準包裝:5,000 系列:HyperLight Load® 類型:降壓（降壓） 輸出類型:固定 輸出數:1 輸出電壓:1.8V 輸入電壓:2.7 V ~ 5.5 V PWM 型:混合物 頻率 - 開關:4MHz 電流 - 輸出:2A 同步整流器:是 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:8-VFDFN 裸露焊盤，8-MLF? 包裝:帶卷 (TR) 供應商設備封裝:8-MLF?（2x2） 產品目錄頁面:1094 (CN2011-ZH PDF) 其它名稱:576-3303-2 |
| LT3682IDD#PBF | 制造商:Linear Technology 功能描述:DC-DC CONVERTER BUCK 2.2MHZ 制造商:Linear Technology 功能描述:DC-DC CONVERTER, BUCK, 2.2MHZ, DFN-12 |
| LT3682IDD#TRPBF | 功能描述:IC REG BUCK ADJ 1A 12DFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關穩(wěn)壓器 系列:- 標準包裝:2,500 系列:- 類型:降壓（降壓） 輸出類型:固定 輸出數:1 輸出電壓:1.2V，1.5V，1.8V，2.5V 輸入電壓:2.7 V ~ 20 V PWM 型:- 頻率 - 開關:- 電流 - 輸出:50mA 同步整流器:是 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:10-TFSOP，10-MSOP（0.118"，3.00mm 寬）裸露焊盤 包裝:帶卷 (TR) 供應商設備封裝:10-MSOP 裸露焊盤 |
| LT3682IDD-PBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:1A Micropower Step-Down |
| LT3682IDD-TRPBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:1A Micropower Step-Down |
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