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。
工業、汽車和LED照明應用選型概要
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。
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。
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。
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。
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"
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。
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
|
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。
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
|
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。
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
|
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
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
|
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。
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
|
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
|