參數(shù)資料
型號(hào)： LT3741IUF#PBF
廠商： LINEAR TECHNOLOGY CORP
元件分類： 穩(wěn)壓器
英文描述： SWITCHING CONTROLLER, 1070 kHz SWITCHING FREQ-MAX, PQCC20
封裝： 4 X 4 MM, LEAD FREE, PLASTIC, MO-220WGGD-1, QFN-20
文件頁(yè)數(shù)： 7/24頁(yè)
文件大?。?/td> 243K
代理商： LT3741IUF#PBF
LT3741
15
3741fb
Table 3. Recommended Switching FETs
VIN
(V)
VOUT
(V)
IOUT
(A)
TOP FET
BOTTOM FET MANUFACTURER
8
4
5-10 RJK0365DPA
RJK0330DPB Renesas
www.renesas.com
24
4
5
RJK0368DPA
RJK0332DPB
24
2-4
20
RJK0365DPA
RJK0346DPA
12
2-4
10
FDMS8680
FDMS8672AS Fairchild
www.fairchildsemi.com
36
4
20
Si7884BDP
SiR470DP
Vishay
www.vishay.com
24
4
40
PSMN4R0-
30YL
RJK0346DPA NXP/Philips
www.nxp.com
Input Capacitor Selection
The input capacitor should be sized at 4μF for every 1A
of output current and placed very close to the high side
MOSFET. A small 1μF ceramic capacitor should be placed
near the VIN and ground pins of the LT3741 for optimal
noise immunity. The input capacitor should have a ripple
current rating equal to half of the maximum output current.
It is recommended that several low ESR ceramic capacitors
be used as the input capacitance. Use only type X5R or
X7R capacitors as they maintain their capacitance over a
wide range of operating voltages and temperatures.
Output Capacitor Selection
The output capacitors need to have very low ESR (equivalent
series resistance) to reduce output ripple. A minimum of
20μF/A of load current should be used in most designs.
The capacitors also need to be surge rated to the maximum
output current. To achieve the lowest possible ESR, several
low ESR capacitors should be used in parallel. Many
applications benet from the use of high density POSCAP
capacitors, which are easily destroyed when exposed to
overvoltage conditions. To prevent this, select POSCAP
capacitors that have a voltage rating that is at least 50%
higher than the regulated voltage
CBOOT Capacitor Selection
The CBOOT capacitor must be sized less than 220nF and
more than 50nF to ensure proper operation of the LT3741.
Use 220nF for high current switching MOSFETs with high
gate charge.
VCC_INT Capacitor Selection
The bypass capacitor for the VCC_INT pin should be larger
than 5μF for stability and has no ESR requirement. It
is recommended that the ESR be lower than 50mΩ to
reduce noise within the LT3741. For driving MOSFETs
with gate charges larger than 10nC, use 0.5μF/nC of total
gate charge.
Soft-Start
Unlike conventional voltage regulators, the LT3741 utilizes
the soft-start function to control the regulated inductor
current. The charging current is 11μA and reduces the
regulated current when the SS pin voltage is lower than
CTRL1.
APPLICATIONS INFORMATION
Figure 4a. Power Loss Example for M1
Figure 4b. Power Loss Example for M2
Figure 4
INPUT VOLTAGE (V)
0
4
5
7
30
3741 F04a
3
2
10
20
40
1
0
6
MOSFET
POWER
LOSS
(W)
TOTAL
OHMIC
TRANSITIONAL
INPUT VOLTAGE (V)
0
MOSFET
POWER
LOSS
(W)
1.0
1.5
40
3741 F04b
0.5
0
10
20
30
2.5
2.0
TOTAL
OHMIC
TRANSITIONAL
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LT3742EUF#PBF 功能描述:IC REG CTRLR BUCK PWM CM 24-QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:PolyPhase® 特色產(chǎn)品:LM3753/54 Scalable 2-Phase Synchronous Buck Controllers 標(biāo)準(zhǔn)包裝:1 系列:PowerWise® PWM 型:電壓模式 輸出數(shù):1 頻率 - 最大:1MHz 占空比:81% 電源電壓:4.5 V ~ 18 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-5°C ~ 125°C 封裝/外殼:32-WFQFN 裸露焊盤 包裝:Digi-Reel® 產(chǎn)品目錄頁(yè)面:1303 (CN2011-ZH PDF) 其它名稱:LM3754SQDKR
LT3742EUF#TRPBF 功能描述:IC REG CTRLR BUCK PWM CM 24-QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:PolyPhase® 標(biāo)準(zhǔn)包裝:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:500kHz 占空比:96% 電源電壓:4 V ~ 36 V 降壓:無 升壓:是 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:24-WQFN 裸露焊盤 包裝:帶卷 (TR)
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