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参数资料
| 型号： | LT3741IUF#PBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING CONTROLLER, 1070 kHz SWITCHING FREQ-MAX, PQCC20 |
| 封装： | 4 X 4 MM, LEAD FREE, PLASTIC, MO-220WGGD-1, QFN-20 |
| 文件页数： | 7/24页 |
| 文件大小： | 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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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3741IUF-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:High Power, Constant Current, Constant Voltage, Step-Down Controller |
| LT3742 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Dual, 2-Phase Step-Down Switching Controller |
| LT3742_1 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Dual, 2-Phase Step-Down Switching Controller Programmable Soft-Start |
| LT3742EUF#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 24-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:PolyPhase® 特色产品:LM3753/54 Scalable 2-Phase Synchronous Buck Controllers 标准包装:1 系列:PowerWise® PWM 型:电压模式 输出数:1 频率 - 最大:1MHz 占空比:81% 电源电压:4.5 V ~ 18 V 降压:是 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-5°C ~ 125°C 封装/外壳:32-WFQFN 裸露焊盘 包装:Digi-Reel® 产品目录页面:1303 (CN2011-ZH PDF) 其它名称:LM3754SQDKR |
| LT3742EUF#TRPBF | 功能描述:IC REG CTRLR BUCK PWM CM 24-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:PolyPhase® 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:24-WQFN 裸露焊盘 包装:带卷 (TR) |
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