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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。

描述: D:\Task file\03.eNews\10-Issue 10\Icons\Icon_Industrial.jpg

描述: D:\Task file\03.eNews\10-Issue 10\Icons\Icon_Car.jpg

描述: D:\Task file\03.eNews\10-Issue 10\Icons\Icon_Communication.jpg

描述: D:\Task file\03.eNews\10-Issue 10\01-Pictures\Icons\新增資料夾\Icon_LED_Lighting-2.jpg.png

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

汽车

      · 车载信息、娱乐设备

      · USB电源

通讯

          · 网络设备

          · 服务器

          · 数据存储设备

专业LED照明

           · 汽车照明

           · 路灯

           · 显示照明

           · 照明控制系统



工业、汽车和LED照明应用选型概要

Technical Document Image Preview



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。

Technical Document Image Preview

P/N

Description

IOUT

VIN

VOUT

fSW

Key Features

Package

RT2657BQ

Synchronous

Buck converter

0.6A

2.7V~5.5V

0.6V~5.5V

2.25MHz

· AEC-Q100 Compliance

· Built-in Soft-Start

· 1.5A Current limit peak

WDFN-8L 3x3

RT5712A

2A

2.7V~5.5V

0.6V~3.4V

1MHz

· RON 100mΩ HS / 70mΩ LS

· 1.2ms fixed Soft-Start

· CMCOT topology: good transient response, stable with MLCC

· Hiccup or Latch off UVP

WDFN-6L-2x2

RT8079

3A

2.95V~6V

VREF: 0.827V

300kHz~2MHz

· RON 45mΩ HS / 45mΩ LS

· Power Good

· Adjustable Soft-Start

WQFN-16L-3x3

RT8086B

3.5A

2.8V~5.5V

0.6V~3.3V

1.2MHz

· RON 50mΩ HS / 40mΩ LS

· CMCOT topology: good transient response, stable with MLCC

· Power Good

· Built-in Soft-Start

· Hiccup UVP

UQFN-12L-2x2 (FC)

RT8074

4A

2.7V~5.5V

0.8V~5V

200kHz~2MHz

· Built-in Soft-Start

PSOP-8

P/N

Description

IOUT

VIN

VOUT

VDropout

Key Features

Package

RT2517B

LDO

1A

2.2V~6V

1.2V~VIN

200mV@1A

· AEC-Q100 Compliance

· Low Quiescent 1.5µA in Shutdown Mode

PSOP-8

RT2517C

1A

2.2V~6V

1.2V~VIN

150mV@1A

· 3T Grade

· Low Quiescent 0.1µA in Shutdown Mode

VDFN-8AL-3x3

RT2518

LDO with EN

1A

1.4V~6V

0.5V~VIN

200mV@1A

· 3T Grade

· EN control

WDFN-8L-3x3

RT2515H

2A

1.4V~6V

0.5V~VIN

400mV@2A

· 3T Grade

· EN control

PSOP-8



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。

Technical Document Image Preview

P/N

Description

IOUT

VIN

VOUT

fSW

Key Features

Package

RT8297B

Current Mode Synchronous Buck converter

1.5A

4V~17V

0.8V~12V

800kHz

· Power Good

WDFN-8L-2x2

RT6232/33/A/B

A:PSM

B:PWM

ACOT® Synchronous

Buck converter

2A/3A

4.5V~18V

0.765V~8V

500kHz

· ACOT® topology for ultra-fast transient response and MLCC COUT stable

· Adjustable Soft-Start

· Power Good

· Force PWM or PSM (enhanced light load efficiency)

WDFN-8L-2x3

RT7275/76

75:PWM

76:PSM

3A

700kHz

WDFN-10L-3x3

PTSSOP-14

RT7231/32

31:PWM

32:PSM

4A

650kHz

WDFN-10L-3x3

PTSSOP-14

RT6206B

PSM

5.5A

650kHz

WDFN-10L-3x3

PSOP-8

RT2859A/B

A:PSM

B:PWM

ACOT® Synchronous

Buck converter

3A

4.5V~18V

0.765V~7V

650kHz

· 3T Grade

· ACOT® topology for ultra-fast transient response and MLCC COUT stable

· Adjustable Soft-Start

· Power Good

· Hiccup or Latch off UVP

WDFN-16L-3x3

RT2855A/B

A:PSM

B:PWM

4A

650kHz

WDFN-16L-3x3

RT2856

Current Mode Synchronous Buck converter

6A

4.5V~18V

VREF: 0.8V

200kHz~1.6MHz

· 3T Grade

· RON 26mΩ HS / 19mΩ LS

· Adjustable Soft-Start

· Power Good

· VREF:0.8V ±1% over -40°C ~ 85°C

WQFN-14AL-3.5x3.5



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。

Technical Document Image Preview

P/N

Description

IOUT

VIN

VOUT

fSW

Key Features

Package

RT7262/63/64

Current Mode Synchronous Buck converter

2A/3A/4A

4.5V~21V

0.808V~15V

500kHz

· Synchronized external clock from 300kHz~2MHz

· Adjustable Soft-Start

· Low LS RON ideal for low VOUT

WDFN-14L-4x3

PSOP-8

RT8299

3A

3V~24V

0.8V~15V

500kHz

· Power Good and very wide VIN range

WDFN-10L-3x3

PSOP-8

RT6220

ACOT® Synchronous

Buck converter

6A

4.5V~23V

0.6V~5V

500kHz

· ACOT® topology for ultra-fast transient response and MLCC COUT stable

· RON 31mΩ HS / 20mΩ LS

· Power Good

UQFN-16L-3x3(FC)

RT7238

ACOT® Synchronous

Buck converterwith 3.3V/5V LDO

8A

8V~23V

0.9V~5V Adj.

3.35V fixed

5.0V fixed

500kHz

· ACOT® topology for ultra-fast transient response and MLCC COUT stable

· RON 27mΩ HS / 10mΩ LS

· With fixed 70mA 3.3V/5V LDO

UQFN-10L-3x3(FC)

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。

Technical Document Image Preview

P/N

Description

IOUT

VIN

VOUT

fSW

Key Features

Package

RT6208

Buck converter

0.1A

4.5V~36V

Adj.VOUT

VREF = 0.8V

Hysteretic mode operation using Boundary conduction mode

· Synchronous

· Adjustable current limit

· 25µA IQ

· Very high efficiency at low load

SOT-23-6

PSOP-8(w/PG)

SOT-23-8(w/PG)

RT6200

0.6A

4.5V~36V

0.8V~15V± 2%

1.2MHz

· Asynchronous with internal 0.3Ω HS MOSFET

SOT-23-6

P/N

Description

IOUT

VIN

VOUT

VDropout

Key Features

Package

RT9058

RT2560Q

LDO

100mA

3.5V~36V

2.5V,3.3V,5V,12V fixed

550mV@10mA

· AEC-Q100 Grade(RT2560Q)

· 2µA ultra low IQ

SOT-23-3

SOT-89

PSOP-8

应用笔记: "在工业场合为MCU供电"

Technical Document Image Preview



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。

Technical Document Image Preview

P/N

Description

IOUT

VIN

VOUT

fSW

Key Features

Package

RT7272A
RT7272B

(PWM/PSM)

Current Mode

Buck converter

3A

4.5V~36V

0.8V~30V

500kHz

· Adjustable current limit: 2.5A~5.5A

· Integrated 150/80mΩ HS/LS MOSFET

PSOP-8

RT2872

3A

4.5V~36V

0.8V~30V

300kHz~1MHz

· AEC-Q100 Grade 3

· 105/80mΩ HS/LS MOSFET

· Ext.compensation

PSOP-8

RT2875A/B

(latch UV/hiccup UV)

3A

4.5V~36V

0.6V~24V

300kHz~2.1MHz

· AEC-Q100 Grade 2

· 95/70mΩ HS/LS MOSFET

· Ext.compensation

· Adjustable current limit:1.5A~6A

PTSSOP-14

RT8289

RT8279

5A

peak

5.5V~32V

5.5V~36V

1.222V~26V

500kHz

· Asynchronous with integrated 100mΩ HS MOSFET

· Internal compensation & Soft-Start

PSOP-8

RT2805A

5A

peak

5.5V~36V

1.222V~26V

500kHz

· 3T Grade

· Asynchronous with integrated 110mΩ HS MOSFET

· Internal compensation & Soft-Start

PSOP-8

Technical Document Image Preview



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。

Technical Document Image Preview

P/N

Description

IOUT

VIN

VOUT

VDropout

Key Features

Package

RT2571

LDO

50mA

4.5V~60V

2.5V,3.3V,5V Fixed

1.25-60V Adj.

250mV@50mA

· 30µA low IQ

· -60V reverse protection

PSOP-8, PMSOP-8,
SOT-223

RT9074

100mA

4.5V~60V

2.5V,3.3V,5V Fixed

1.25-60V Adj.

300mV@100mA

· 30µA low IQ

· -60V reverse protection

PSOP-8, PMSOP-8,
SOT-223

RT9068

230mA

4.5V~60V

2.5V,3.3V,5V fixed

1.25V~60V Adj.

230mV@50mA

· 30µA low IQ

· -60V reverse protection

PSOP-8, PMSOP-8,
SOT-223

RT9072A/B

20mA

4.5V~80V

1.25V~60V Adj.

180mV@20mA

· 23µA low IQ

· -80V reverse protection

SOT-23-5,
WDFN-8L 3x3

Technical Document Image Preview



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。

Technical Document Image Preview

P/N

Description

IOUT

VIN

VOUT

fSW

Key Features

Package

RT8525

Boost controller

Limited by ext.MOSFET

4.5V~29V

Limited by MOSFET

50K-600kHz

· Programmable Soft-Start Time

· Programmable Boost SW Frequency

· Fault signaling pin

SOP-14

Technical Document Image Preview



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

Technical Document Image Preview

P/N

Description

IOUT

VIN

Key Features

Where to use, (application examples)

Package

RT8471

Hysteretic control, high brightness LED driver

1/1.2A

7V~36V

· Simple application: no COUT needed

· Analog or digital dimming control

· Ultra-fast response

· Colour control for single string

· LED strips, signage, < 15W

· MR-16 ≤ 4WSingle string buck with color control via LED shunt dimming

TSOT-23-5

PMSOP-8

PSOP-8

RT8474
RT8474A

(A:OVP for hot swap function)

50V high voltage LED driver

2A

4.5V~50V

· Analog or digital dimming control

· Low RON

· LED strips, signage, LED engines, POUT< 30W

· RT8474A with special open string protection is ideal for hot-swap LED string

PSOP-8

Technical Document Image Preview



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。

Technical Document Image Preview

P/N

Description

IOUT

VIN

VLED

Key Features

Where to use

Package

RT8477A

Buck / Boost controller

Limited by external MOSFET

4.5V~50V

up to 50V

· low component count

· Analog or PWM Dimming control

· Wide input / output range with medium power: LED modules, down-light, emergency lighting

· Buck ≤ 60W, Boost ≤ 40W

PSOP-8

RT8475/
RT8494

LED Driver Controller for Buck, Boost or Buck-Boost Topology

4.5V~36V

(IC VIN)

up to 90V

· Programmable FSW 100kHzto 1MHz

· Analog or Digital to Analog Dimming control

· Industrial Display Backlight

· AEC-Q100 Compliance (RT8494)

SOP-14,

WQFN-16L 3x3

RT8485

LED Driver controller for

Buck/Boost/Buck-Boost topologies

4.5V~36V

(IC VIN)

up to 150V

· Programmable switching frequency

· Analog, Digital or Digital to Analog Dimming control

· Street lighting

· High power, high LED string application

· Buck ≤ 100W, Boost ≤ 80W

SOP-14

Technical Document Image Preview



功率开关和DDR存储器总线终端调节器

P/N

Description

IOUT

VIN

Key Features

Package

RT2528

Power Switch with adj.ILIM

0.5A~2.5A

2.5V~5.5V

· 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

PSOP-8

RT2526Q

DDR Termination regulator

DDRII/III:2A

VIN:3.1V~3.6V

VLDOIN:1.2V~1.8V

· 3T Grade

· S3, S5 off modes

· MLCC stable

· Remote sense

PSOP-8



相关资源
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