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| 型号： | LT3740EDHC#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 1/20页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM CM 16-DFN |
| 标准包装： | 73 |
| 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： | 管件 |
| 产品目录页面： | 1332 (CN2011-ZH PDF) |
LT3740
Wide Operating Range,
Valley Mode, No R SENSE ?
Synchronous Step-Down Controller
FEATURES
DESCRIPTION
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Wide V IN Range: 2.2V to 22V
Internal Boost Provides 6V Gate Drive
For V IN Down to 2.2V
No Sensing Resistor Required
Dual N-Channel MOSFET Synchronous Drive
Valley Current Mode Control
Optimized for High Step-Down Ratio
Power Good Output Voltage Monitor
0.8V Reference
Three Pin-Selected Current Limit Levels
Constant Switching Frequency: 300kHz
Programmable Soft-Start
Output Voltage Tracking
Available in 16-Pin 5mm × 3mm DFN
The LT ? 3740 is a synchronous step-down switching
regulator controller that drives N-channel power MOSFET
stages. The controller uses valley current mode architecture
to achieve very low duty cycles with excellent transient
response without requiring a sense resistor.
The LT3740 includes an internal step-up converter to
provide a bias 7.8V higher than the input voltage for the
drive. This enables the part to work from an input voltage
as low as 2.2V.
The XREF pin is an external reference input that allows the
user to override the internal 0.8V feedback reference with
any lower value, allowing full control of the output voltage
during operation, output voltage tracking or soft-start.
The LT3740 has three current limit levels that can be
Notebook and Palmtop Computers, PDA
Portable Instruments
Distributed Power Systems
APPLICATIONS
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TYPICAL APPLICATION
High Ef?ciency Step-Down Converter
chosen by connecting the RANGE pin to ground, open,
and input respectively.
L , LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
No R SENSE is a trademark of Linear Technology Corporation. All other trademarks are the
property of their respective owners.
Ef?ciency vs Load Current
22μH
SWB
LT3740
BGDP
1μF
V IN
3V to 12V
10μF
94
92
V IN
SHDN
BIAS
TGATE
1Ω
1Ω
M1
HAT2168H
0.9μH
V OUT
90
88
V IN = 3V
V IN = 5V
SN
15k
15k
0.22μF
20k
XREF
V C
SW
SN +
BGATE
–
PGND
1Ω
M2
HAT2165H
D1
B320A
39pF
105k
1.8V
10A
100μF
3
86
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82
80
0
2
V IN = 12V
V OUT = 1.8V
4 6 8
LOAD CURRENT (A)
10
1nF
RANGE GND FB
22pF
80.6k
3740 TA01a
3740 TA01b
3740fc
1
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3740EDHC-TR | 制造商:LINER 制造商全称:Linear Technology 功能描述:Wide Operating Range, Valley Mode, No RSENSE? Synchronous Step-Down Controller |
| LT3740EDHC-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Wide Operating Range, Valley Mode, No RSENSE? Synchronous Step-Down Controller |
| 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 |
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