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参数资料
| 型号： | LT3742EUF#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 1/26页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM CM 24-QFN |
| 标准包装： | 2,500 |
| 系列： | PolyPhase® |
| PWM 型： | 电流模式 |
| 输出数： | 2 |
| 频率 - 最大： | 560kHz |
| 占空比： | 100% |
| 电源电压： | 4 V ~ 30 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： | 24-WFQFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
LT3742
Dual, 2-Phase Step-Down
Switching Controller
Wide Input Voltage Range: 4V to 30V
Wide Output Voltage Range: 0.8V to V IN
Low Shutdown I Q : 20μA
Out-of-Phase Controllers Reduce Required Input
0.8V ±1.5% Voltage Reference
500kHz Current Mode Fixed Frequency Operation
Internal Boost Converter Provides Bias Rail for
Power Good Voltage Monitor for Each Output
Programmable Soft-Start
24-Lead 4mm × 4mm × 0.75mm Package
Satellite and Cable TV Set-Top Boxes
Distributed Power Regulation
Automotive Systems
Super Capacitor Charger
FEATURES
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n
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Capacitance and Power Supply Induced Noise
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n
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N-channel MOSFET Gate Drive
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APPLICATIONS
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TYPICAL APPLICATION
8V and 5V Dual Step-Down Converter
DESCRIPTION
The LT ? 3742 is a dual step-down DC/DC switching regulator
controller that drives high side N-channel power MOSFETs.
A 500kHz fixed frequency current mode architecture pro-
vides fast transient response with simple loop compensa-
tion components and cycle-by-cycle current limiting. The
output stages of the two controllers operate 180° out of
phase to reduce the input ripple current, minimizing the
noise induced on the input supply, and allowing less input
capacitance.
An internal boost regulator generates a bias rail of V IN + 7V
to provide gate drive for the N-channel MOSFETs allowing
low dropout and 100% duty cycle operation. The LT3742
can be used for applications where both controllers need
to operate independently, or where both controllers are
used to provide a single higher current output.
The device is available in a thermally enhanced 4mm ×
4mm QFN package.
L , LT, LTC, LTM, Linear Technology, the Linear logo, PolyPhase and Burst Mode are registered
trademarks and No R SENSE is a trademark of Linear Technology Corporation. All other
trademarks are the property of their respective owners.
Efficiency vs Load Current
V IN
14V
10 μH
4.7μF
100
90
8V OUT
1μF
45.3k
V IN
UVLO
SWB BIAS
80
5V OUT
20.0k
LT3742
70
V IN
V IN
60
V OUT1
8V
4A
47μF
10μF
1.8k
0.010?
6.5μH
G1
SW1
SENSE1 +
SENSE1 –
FB1
G2
SW2
SENSE2 +
SENSE2 –
FB2
6.5μH
0.010?
1.05k
10μF
V OUT2
5V
4A
47μF
50
40
0
0.5
1
1.5 2 2.5
LOAD CURRENT (A)
3
3.5
4
200?
200?
3742 TA01b
RUN1
1nF
1000pF
PG1
30k
PG1
RUN/SS1
V C1
PG2
RUN/SS2
V C2
GND
PG2
20k
1000pF
1nF
RUN2
3742 TA01a
3742fa
1
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3743 | 制造商:LINER 制造商全称:Linear Technology 功能描述:High Current Synchronous Step-Down LED Driver with Three-State Control |
| LT3743_10 | 制造商:LINER 制造商全称:Linear Technology 功能描述:High Current Synchronous Step-Down LED Driver with Three-State Control |
| LT3743EFE#PBF | 功能描述:IC LED DVR HP CONST CURR 28TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - LED 驱动器 系列:- 标准包装:60 系列:- 恒定电流:- 恒定电压:- 拓扑:线性（LDO），PWM，升压（升压） 输出数:8 内部驱动器:是 类型 - 主要:背光 类型 - 次要:RGB，白色 LED 频率:500kHz ~ 1.5MHz 电源电压:4.75 V ~ 26 V 输出电压:45V 安装类型:* 封装/外壳:* 供应商设备封装:* 包装:* 工作温度:-40°C ~ 85°C |
| LT3743EFE#PBF | 制造商:Linear Technology 功能描述:IC LED DRIVER BUCK TSSOP-28 |
| LT3743EFE#TRPBF | 功能描述:IC LED DVR SYNC STEPDOWN 28TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - LED 驱动器 系列:- 标准包装:6,000 系列:- 恒定电流:- 恒定电压:- 拓扑:开路漏极，PWM 输出数:4 内部驱动器:是 类型 - 主要:LED 闪烁器 类型 - 次要:- 频率:400kHz 电源电压:2.3 V ~ 5.5 V 输出电压:- 安装类型:表面贴装 封装/外壳:8-VFDFN 裸露焊盘 供应商设备封装:8-HVSON 包装:带卷 (TR) 工作温度:-40°C ~ 85°C 其它名称:935286881118PCA9553TK/02-TPCA9553TK/02-T-ND |
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