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参数资料
| 型号： | LT3740EDHC#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 9/20页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM CM 16-DFN |
| 标准包装： | 2,500 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 330kHz |
| 占空比： | 90% |
| 电源电压： | 2.2 V ~ 22 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： | -40°C ~ 85°C |
| 封装/外壳： | 16-WFDFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
LT3740
APPLICATIONS INFORMATION
The ρ T term is a normalization factor (unity at 25°C)
accounting for the signi?cant variation in on-resistance
with temperature, typically about 0.4%/°C as shown in
Figure 1. For a maximum junction temperature of 100°C,
using a value ρ T = 1.3 is reasonable.
2.0
V GS = 10V
I D = 14A
1.6
of the circuit. One of the solution circuits is shown in
Figure 2. The Zener diode and the small MOSFET limit the
SHDN voltage to be about 6V below V IN . This shuts down
the LT3740 for V IN lower than 7V. If V IN can ramp up to
7V quick enough, this circuit is not necessary.
LT3740
V IN
MMSZ52312BS
2N7002TA
BGDP
1.2
100k
SHDN
0.8
0.4
0
–50 –25 0 25 50 75 100 125 150
T J – JUNCTION TEMPERATURE (°C)
3740 F01
Figure 1. MOSFET R DS(ON) vs. Temperature
Gate Drives
The top gate drive power is provided by BIAS which is about
3740 F02
Figure 2. Circuit That Prevents Operation for V IN < 7V
For V IN higher than 14V, the high dv/dt at SW node and
the strong drive of BGATE can generate extra noise and
affect the operation. A resistor R BG of 1Ω-2Ω between
BGATE and the gate of the bottom MOSFET as shown in
Figure 3 can effectively reduce the noise.
LT3740
SW
7.8V higher than V IN . The top gate voltage can be as high
as 7.8V and can droop to about 5.5V if the on-time is long
BGATE
R BG
M2
enough. The bottom gate drive power is provided by the
BGDP pin. BGDP needs to be connected to 7V or higher
to get enough gate drive voltage for logic-level threshold
MOSFETs. BGDP can be connected to V IN , BIAS or an
external voltage supply. For input voltages lower than
7V, BGDP should be connected to BIAS to be able to use
logic-level threshold MOSFETs. For V IN higher than 7V,
BGDP can be connected to V IN to reduce power loss in the
bottom gate drive. For high BGDP voltages, the internal
clamp circuit limits the bottom gate drive voltage to about
8V to prevent the gate from overvoltage damage.
For the case BGDP is connected to V IN , if V IN voltage ramp
up slowly during startup, there will be a considerable period
of time that BGDP is below 7V and the circuit is operating.
The insuf?cient voltage on BGDP could cause malfunction
PGND
3740 F03
Figure 3. Noise Reduction for Bottom MOSFET
The LT3740 uses adaptive dead time control to prevent
the top and bottom MOSFET shoot-through and minimize
the dead time. When the internal top MOSFET on signal
comes, the LT3740 delays the turn on of TGATE until
BGATE is off. When the internal bottom MOSFET on signal
comes, the LT3740 delays the turn on of BGATE until the
SW node swings down to ground. In the case of small
or negative inductor current that SW node cannot swing
below ground after TGATE turns off, BGATE will turn on
200ns after TGATE is off.
3740fc
9
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3741 | 制造商:LINER 制造商全称:Linear Technology 功能描述:High Voltage, Current Mode Switching Regulator Controller Thermal Shutdown |
| LT3741EFE#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 20TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 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 |
| LT3741EFE#PBF | 制造商:Linear Technology 功能描述:DC-DC CONTROLLER BUCK 1MHZ 制造商:Linear Technology 功能描述:DC-DC CONTROLLER, BUCK, 1MHZ, TSSOP-20 |
| LT3741EFE#TRPBF | 功能描述:IC REG CTRLR BUCK PWM CM 20TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:4,500 系列:PowerWise® PWM 型:控制器 输出数:1 频率 - 最大:1MHz 占空比:95% 电源电压:2.8 V ~ 5.5 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:-40°C ~ 125°C 封装/外壳:6-WDFN 裸露焊盘 包装:带卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名称:LM1771SSDX |
| LT3741EFEPBF | 制造商:Linear Technology 功能描述:Step-Down Controller TSSOP20EP |
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