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工業、 汽車和LED照明應用的寬輸入電壓範圍DC/DC電源轉換方案



簡介

立錡科技擁有各種各樣的電源轉換方案,其輸入電壓範圍涵蓋1.4V至80V的寬闊空間,可供工業、汽車和專業照明等廣泛的領域使用。

此應用筆記將立錡科技的部分線性和開關模式轉換器列入其中,內容涵蓋低耗電線性穩壓器(LDO)、高效率升壓/降壓DC/DC轉換器和控制器、LED驅動器、功率開關和DDR記憶體匯流排終端調節器。

  • 列入其中的很多器件具有特別的性能,有的具有PGOOD信號,有的具有可程式設計的軟起動特性。
  • 立錡科技的很多Buck轉換器採用了魯棒性極高的控制架構,ACOT®就是其中之一,利用這種特殊的控制架構,補償電路不再被需要,使用起來也特別簡單。
  • 很多器件採用了熱性能得到強化的封裝,容許使用在較高的溫度環境之下。
  • 針對工業和汽車應用,立錡科技提供經過三溫(3T)測試和AEC-Q100認證的產品,它們可在-40°C ~ 85°C工業溫度範圍內穩定工作並確保相應的性能。
  • 所有器件都可使用陶瓷電容作為輸入、輸出電容,可以大大延長產品使用壽命。

由於具有這些特性,這些器件可以滿足如下應用場合的需要,但又絕不僅限於此。

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

工業

  • 電錶
  • 嵌入式計算
  • 工業控制系統
  • 可擕式設備
  • 測試儀器
  • 工業攝像機

汽車

  • 車載資訊、娛樂設備
  • USB電源

通訊

  • 網路設備
  • 伺服器
  • 數據存放裝置

專業LED照明

  • 汽車照明
  • 路燈
  • 顯示照明
  • 照明控制系統


工業、汽車和LED照明應用選型概要

Technical Document Image Preview



Buck轉換器和LDO


輸入電壓1.4V~6V、電流高達4A的Buck轉換器或LDO

最適合以鋰離子電池為電源的應用需要的產品,5V供電場合的需要也被涵蓋其中。

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輸入、負載電流能力達6A的Buck轉換器

最適合5V~12V輸入電壓範圍的應用。

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輸入、負載電流能力高達8A的Buck轉換器

非常適合12V輸入電壓的應用,容許輸入電壓在較寬的範圍內變化。

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)

參考閱讀:

應用筆記: "Buck converter selection criteria"

應用筆記: "降壓轉換器架構之比較"



3.5V~36V輸入電壓、負載電流高達0.6A的Buck轉換器/低耗電LDO

24V電源供電的低功耗應用的理想選擇,可用於電錶、照明控制、感測器應用等場合。

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

應用筆記: "在工業場合為MCU供電"

Technical Document Image Preview



4.5V~36V輸入、負載能力高達5A的Buck轉換器

24V供電的USB電源、顯示裝置、中功率MCU、儀器儀錶等應用的理想選擇。

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輸入、負載能力高達230mA的LDO

特別適合使用在存在大範圍電壓波動的場合,它們能承受±60/±80V的電壓衝擊,可為汽車應用提供高可靠的電源供應解決方案,滿足感測器、低功耗MCU等應用需要。

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輸入的Boost控制器

高壓大功率應用的理想選擇,可滿足諸如24V轉48V之類應用的需要,可用於顯示器背光系統、熱敏印表機、電池充電等應用中。

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驅動器


4.5V~50V輸入的恒流降壓轉換器

工業LED照明的理想選擇

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輸入、輸出電流可達2A的恒流LED驅動器/ Buck-Boost控制器

工業照明/汽車照明的理想選擇,可滿足多顆LED串聯應用、路燈、顯示器背光等應用的需要。

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



功率開關和DDR記憶體匯流排終端調節器

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



相關資源
立錡科技電子報 訂閱立錡科技電子報
檔案下載 PDF 下載



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