工业、 汽车和LED照明应用的宽输入电压范围DC/DC电源转换方案
简介
立锜科技拥有各种各样的电源转换方案,其输入电压范围涵盖1.4V至80V的宽阔空间,可供工业、汽车和专业照明等广泛的领域使用。
此应用笔记将立锜科技的部分线性和开关模式转换器列入其中,内容涵盖低耗电线性稳压器(LDO)、高效率升压/降压DC/DC转换器和控制器、LED驱动器、功率开关和DDR存储器总线终端调节器。
- 列入其中的很多器件具有特别的性能,有的具有PGOOD信号,有的具有可编程的软起动特性。
- 立锜科技的很多Buck转换器采用了鲁棒性极高的控制架构,ACOT®就是其中之一,利用这种特殊的控制架构,补偿电路不再被需要,使用起来也特别简单。
- 很多器件采用了热性能得到强化的封装,容许使用在较高的温度环境之下。
- 针对工业和汽车应用,立锜科技提供经过三温(3T)测试和AEC-Q100认证的产品,它们可在-40°C ~ 85°C工业温度范围内稳定工作并确保相应的性能。
- 所有器件都可使用陶瓷电容作为输入、输出电容,可以大大延长产品使用寿命。
由于具有这些特性,这些器件可以满足如下应用场合的需要,但又绝不仅限于此。
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工业
· 电表
· 嵌入式计算
· 工业控制系统
· 便携式设备
· 测试仪器
· 工业摄像机
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汽车
· 车载信息、娱乐设备
· USB电源
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通讯
· 网络设备
· 服务器
· 数据存储设备
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专业LED照明
· 汽车照明
· 路灯
· 显示照明
· 照明控制系统
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工业、汽车和LED照明应用选型概要
Buck转换器和LDO
输入电压1.4V~6V、电流高达4A的Buck转换器或LDO
最适合以锂离子电池为电源的应用需要的产品,5V供电场合的需要也被涵盖其中。
P/N
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Description
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IOUT
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VIN
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VOUT
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fSW
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Key Features
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Package
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RT2657BQ
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Synchronous
Buck converter
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0.6A
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2.7V~5.5V
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0.6V~5.5V
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2.25MHz
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· AEC-Q100 Compliance
· Built-in Soft-Start
· 1.5A Current limit peak
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WDFN-8L 3x3
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RT5712A
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2A
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2.7V~5.5V
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0.6V~3.4V
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1MHz
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· RON 100mΩ HS / 70mΩ LS
· 1.2ms fixed Soft-Start
· CMCOT topology: good transient response, stable with MLCC
· Hiccup or Latch off UVP
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WDFN-6L-2x2
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RT8079
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3A
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2.95V~6V
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VREF: 0.827V
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300kHz~2MHz
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· RON 45mΩ HS / 45mΩ LS
· Power Good
· Adjustable Soft-Start
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WQFN-16L-3x3
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RT8086B
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3.5A
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2.8V~5.5V
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0.6V~3.3V
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1.2MHz
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· RON 50mΩ HS / 40mΩ LS
· CMCOT topology: good transient response, stable with MLCC
· Power Good
· Built-in Soft-Start
· Hiccup UVP
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UQFN-12L-2x2 (FC)
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RT8074
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4A
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2.7V~5.5V
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0.8V~5V
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200kHz~2MHz
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· Built-in Soft-Start
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PSOP-8
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P/N
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Description
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IOUT
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VIN
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VOUT
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VDropout
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Key Features
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Package
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RT2517B
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LDO
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1A
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2.2V~6V
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1.2V~VIN
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200mV@1A
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· AEC-Q100 Compliance
· Low Quiescent 1.5µA in Shutdown Mode
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PSOP-8
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RT2517C
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1A
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2.2V~6V
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1.2V~VIN
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150mV@1A
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· 3T Grade
· Low Quiescent 0.1µA in Shutdown Mode
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VDFN-8AL-3x3
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RT2518
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LDO with EN
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1A
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1.4V~6V
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0.5V~VIN
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200mV@1A
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· 3T Grade
· EN control
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WDFN-8L-3x3
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RT2515H
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2A
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1.4V~6V
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0.5V~VIN
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400mV@2A
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· 3T Grade
· EN control
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PSOP-8
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4V~18V输入、负载电流能力达6A的Buck转换器
最适合5V~12V输入电压范围的应用。
P/N
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Description
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IOUT
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VIN
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VOUT
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fSW
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Key Features
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Package
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RT8297B
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Current Mode Synchronous Buck converter
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1.5A
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4V~17V
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0.8V~12V
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800kHz
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· Power Good
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WDFN-8L-2x2
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RT6232/33/A/B
A:PSM
B:PWM
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ACOT® Synchronous
Buck converter
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2A/3A
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4.5V~18V
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0.765V~8V
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500kHz
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· ACOT® topology for ultra-fast transient response and MLCC COUT stable
· Adjustable Soft-Start
· Power Good
· Force PWM or PSM (enhanced light load efficiency)
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WDFN-8L-2x3
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RT7275/76
75:PWM
76:PSM
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3A
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700kHz
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WDFN-10L-3x3
PTSSOP-14
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RT7231/32
31:PWM
32:PSM
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4A
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650kHz
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WDFN-10L-3x3
PTSSOP-14
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RT6206B
PSM
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5.5A
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650kHz
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WDFN-10L-3x3
PSOP-8
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RT2859A/B
A:PSM
B:PWM
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ACOT® Synchronous
Buck converter
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3A
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4.5V~18V
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0.765V~7V
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650kHz
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· 3T Grade
· ACOT® topology for ultra-fast transient response and MLCC COUT stable
· Adjustable Soft-Start
· Power Good
· Hiccup or Latch off UVP
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WDFN-16L-3x3
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RT2855A/B
A:PSM
B:PWM
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4A
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650kHz
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WDFN-16L-3x3
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RT2856
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Current Mode Synchronous Buck converter
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6A
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4.5V~18V
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VREF: 0.8V
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200kHz~1.6MHz
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· 3T Grade
· RON 26mΩ HS / 19mΩ LS
· Adjustable Soft-Start
· Power Good
· VREF:0.8V ±1% over -40°C ~ 85°C
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WQFN-14AL-3.5x3.5
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3V~24V输入、负载电流能力高达8A的Buck转换器
非常适合12V输入电压的应用,容许输入电压在较宽的范围内变化。
P/N
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Description
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IOUT
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VIN
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VOUT
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fSW
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Key Features
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Package
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RT7262/63/64
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Current Mode Synchronous Buck converter
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2A/3A/4A
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4.5V~21V
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0.808V~15V
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500kHz
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· Synchronized external clock from 300kHz~2MHz
· Adjustable Soft-Start
· Low LS RON ideal for low VOUT
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WDFN-14L-4x3
PSOP-8
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RT8299
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3A
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3V~24V
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0.8V~15V
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500kHz
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· Power Good and very wide VIN range
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WDFN-10L-3x3
PSOP-8
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RT6220
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ACOT® Synchronous
Buck converter
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6A
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4.5V~23V
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0.6V~5V
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500kHz
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· ACOT® topology for ultra-fast transient response and MLCC COUT stable
· RON 31mΩ HS / 20mΩ LS
· Power Good
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UQFN-16L-3x3(FC)
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RT7238
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ACOT® Synchronous
Buck converterwith 3.3V/5V LDO
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8A
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8V~23V
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0.9V~5V Adj.
3.35V fixed
5.0V fixed
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500kHz
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· ACOT® topology for ultra-fast transient response and MLCC COUT stable
· RON 27mΩ HS / 10mΩ LS
· With fixed 70mA 3.3V/5V LDO
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UQFN-10L-3x3(FC)
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参考阅读:
应用笔记: "Buck converter selection criteria"
应用笔记: "降压转换器架构之比较"
3.5V~36V输入电压、负载电流高达0.6A的Buck转换器/低耗电LDO
24V电源供电的低功耗应用的理想选择,可用于电表、照明控制、传感器应用等场合。
P/N
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Description
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IOUT
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VIN
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VOUT
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fSW
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Key Features
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Package
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RT6208
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Buck converter
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0.1A
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4.5V~36V
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Adj.VOUT
VREF = 0.8V
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Hysteretic mode operation using Boundary conduction mode
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· Synchronous
· Adjustable current limit
· 25µA IQ
· Very high efficiency at low load
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SOT-23-6
PSOP-8(w/PG)
SOT-23-8(w/PG)
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RT6200
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0.6A
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4.5V~36V
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0.8V~15V± 2%
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1.2MHz
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· Asynchronous with internal 0.3Ω HS MOSFET
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SOT-23-6
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P/N
|
Description
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IOUT
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VIN
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VOUT
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VDropout
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Key Features
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Package
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RT9058
RT2560Q
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LDO
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100mA
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3.5V~36V
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2.5V,3.3V,5V,12V fixed
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550mV@10mA
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· AEC-Q100 Grade(RT2560Q)
· 2µA ultra low IQ
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SOT-23-3
SOT-89
PSOP-8
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应用笔记: "在工业场合为MCU供电"
4.5V~36V输入、负载能力高达5A的Buck转换器
24V供电的USB电源、显示装置、中功率MCU、仪器仪表等应用的理想选择。
P/N
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Description
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IOUT
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VIN
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VOUT
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fSW
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Key Features
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Package
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RT7272A
RT7272B
(PWM/PSM)
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Current Mode
Buck converter
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3A
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4.5V~36V
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0.8V~30V
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500kHz
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· Adjustable current limit: 2.5A~5.5A
· Integrated 150/80mΩ HS/LS MOSFET
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PSOP-8
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RT2872
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3A
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4.5V~36V
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0.8V~30V
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300kHz~1MHz
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· AEC-Q100 Grade 3
· 105/80mΩ HS/LS MOSFET
· Ext.compensation
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PSOP-8
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RT2875A/B
(latch UV/hiccup UV)
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3A
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4.5V~36V
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0.6V~24V
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300kHz~2.1MHz
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· AEC-Q100 Grade 2
· 95/70mΩ HS/LS MOSFET
· Ext.compensation
· Adjustable current limit:1.5A~6A
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PTSSOP-14
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RT8289
RT8279
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5A
peak
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5.5V~32V
5.5V~36V
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1.222V~26V
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500kHz
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· Asynchronous with integrated 100mΩ HS MOSFET
· Internal compensation & Soft-Start
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PSOP-8
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RT2805A
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5A
peak
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5.5V~36V
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1.222V~26V
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500kHz
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· 3T Grade
· Asynchronous with integrated 110mΩ HS MOSFET
· Internal compensation & Soft-Start
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PSOP-8
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4.5V~80V输入、负载能力高达230mA的LDO
特别适合使用在存在大范围电压波动的场合,它们能承受±60/±80V的电压冲击,可为汽车应用提供高可靠的电源供应解决方案,满足传感器、低功耗MCU等应用需要。
P/N
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Description
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IOUT
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VIN
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VOUT
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VDropout
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Key Features
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Package
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RT2571
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LDO
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50mA
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4.5V~60V
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2.5V,3.3V,5V Fixed
1.25-60V Adj.
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250mV@50mA
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· 30µA low IQ
· -60V reverse protection
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PSOP-8, PMSOP-8,
SOT-223
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RT9074
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100mA
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4.5V~60V
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2.5V,3.3V,5V Fixed
1.25-60V Adj.
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300mV@100mA
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· 30µA low IQ
· -60V reverse protection
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PSOP-8, PMSOP-8,
SOT-223
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RT9068
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230mA
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4.5V~60V
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2.5V,3.3V,5V fixed
1.25V~60V Adj.
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230mV@50mA
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· 30µA low IQ
· -60V reverse protection
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PSOP-8, PMSOP-8,
SOT-223
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RT9072A/B
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20mA
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4.5V~80V
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1.25V~60V Adj.
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180mV@20mA
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· 23µA low IQ
· -80V reverse protection
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SOT-23-5,
WDFN-8L 3x3
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Boost控制器
4.5V~29V输入的Boost控制器
高压大功率应用的理想选择,可满足诸如24V转48V之类应用的需要,可用于显示器背光系统、热敏打印机、电池充电等应用中。
P/N
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Description
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IOUT
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VIN
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VOUT
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fSW
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Key Features
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Package
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RT8525
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Boost controller
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Limited by ext.MOSFET
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4.5V~29V
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Limited by MOSFET
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50K-600kHz
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· Programmable Soft-Start Time
· Programmable Boost SW Frequency
· Fault signaling pin
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SOP-14
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LED驱动器
4.5V~50V输入的恒流降压转换器
工业LED照明的理想选择
P/N
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Description
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IOUT
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VIN
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Key Features
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Where to use, (application examples)
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Package
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RT8471
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Hysteretic control, high brightness LED driver
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1/1.2A
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7V~36V
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· Simple application: no COUT needed
· Analog or digital dimming control
· Ultra-fast response
· Colour control for single string
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· LED strips, signage, < 15W
· MR-16 ≤ 4WSingle string buck with color control via LED shunt dimming
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TSOT-23-5
PMSOP-8
PSOP-8
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RT8474
RT8474A
(A:OVP for hot swap function)
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50V high voltage LED driver
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2A
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4.5V~50V
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· Analog or digital dimming control
· Low RON
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· LED strips, signage, LED engines, POUT< 30W
· RT8474A with special open string protection is ideal for hot-swap LED string
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PSOP-8
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4.5V~150V输入、输出电流可达2A的恒流LED驱动器/ Buck-Boost控制器
工业照明/汽车照明的理想选择,可满足多颗LED串联应用、路灯、显示器背光等应用的需要。
P/N
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Description
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IOUT
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VIN
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VLED
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Key Features
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Where to use
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Package
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RT8477A
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Buck / Boost controller
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Limited by external MOSFET
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4.5V~50V
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up to 50V
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· low component count
· Analog or PWM Dimming control
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· Wide input / output range with medium power: LED modules, down-light, emergency lighting
· Buck ≤ 60W, Boost ≤ 40W
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PSOP-8
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RT8475/
RT8494
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LED Driver Controller for Buck, Boost or Buck-Boost Topology
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4.5V~36V
(IC VIN)
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up to 90V
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· Programmable FSW 100kHzto 1MHz
· Analog or Digital to Analog Dimming control
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· Industrial Display Backlight
· AEC-Q100 Compliance (RT8494)
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SOP-14,
WQFN-16L 3x3
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RT8485
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LED Driver controller for
Buck/Boost/Buck-Boost topologies
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4.5V~36V
(IC VIN)
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up to 150V
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· Programmable switching frequency
· Analog, Digital or Digital to Analog Dimming control
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· Street lighting
· High power, high LED string application
· Buck ≤ 100W, Boost ≤ 80W
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SOP-14
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功率开关和DDR存储器总线终端调节器
P/N
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Description
|
IOUT
|
VIN
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Key Features
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Package
|
RT2528
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Power Switch with adj.ILIM
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0.5A~2.5A
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2.5V~5.5V
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· AEC-Q100 Grade 3
· Adjustable current limit: 0.5A~2.5A via an ext. resistance
· 120mΩ P-MOSFET
· Built-in Soft-Start
· Low supply current:120µA
· Reverse input-out voltage
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PSOP-8
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RT2526Q
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DDR Termination regulator
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DDRII/III:2A
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VIN:3.1V~3.6V
VLDOIN:1.2V~1.8V
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· 3T Grade
· S3, S5 off modes
· MLCC stable
· Remote sense
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PSOP-8
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