参数资料
型号: LTC3733CG
厂商: Linear Technology
文件页数: 28/32页
文件大小: 0K
描述: IC CTRLR BUCK AMD 3PHASE 36-SSOP
标准包装: 37
应用: 控制器,AMD
输入电压: 4 V ~ 36 V
输出数: 1
输出电压: 0.8 V ~ 1.55 V
工作温度: 0°C ~ 70°C
安装类型: 表面贴装
封装/外壳: 36-SSOP(0.209",5.30mm 宽)
供应商设备封装: 36-SSOP
包装: 管件
产品目录页面: 1339 (CN2011-ZH PDF)
LTC3733/LTC3733-1
APPLICATIO S I FOR ATIO
The temperature of the MOSFET’s die temperature may
require interative calculations if one is not familiar typical
Total of all three synchronous MOSFET’s AC loss:
performance. A maximum operating junction tempera-
ture of 90 ° to 100 ° C for the MOSFETs is recommended
( 3 ) Q G
V IN
V DSSPEC
( f ) = ( 6 )( 15 nC )
V IN
V DSSPEC
( 4 E 5 )
? I
?
P COMPATH ≈ N ? MAX ? ( R L SENSE OUTESR Loss
) + C
? N ?
? V
? ? I
?
P MAIN = N ? OUT ? ? MAX ? ( 1 + δ ) R DS ( ON ) + C INESR Loss
for high reliability applications.
Common output path DC loss:
2
+ R
This totals 3.375W + C OUTESR loss.
Total of all three main MOSFET’s DC loss:
2
? V IN ? ? N ?
This totals 0.83W + C INESR loss.
This totals 0.08W at V IN = 8V, 0.12W at V IN = 12V and
0.19W at V IN = 20V. The bottom MOSFET does not
experience the Miller capacitance dissipation issue that
the main switch does because the bottom switch turns on
when its drain is close to ground.
The Schottky rectifier loss assuming 50ns nonoverlap
time:
2 ? 3(0.7V)(15A)(50ns)(4E5)
This totals 1.26W.
The total output power is (1.3V)(45A) = 58.5W and the
total input power is approximately 60W so the % loss of
each component is as follows:
?
? ? I
?
V
P SYNC = N ? 1 – OUT ? ? MAX ? ( 1 + δ ) R DS ( ON )
Total of all three synchronous MOSFET’s DC loss:
2
? V IN ? ? N ?
This totals 5.4W.
Main switch AC loss (V IN = 12V)
Main switch DC loss
Synchronous switch AC loss
Synchronous switch DC loss
2.25W
0.83W
0.19W
5.4W
3.75%
1.4%
0.3%
9%
Total of all three main MOSFET’s AC loss:
Power path loss
3.375W 5.6%
P MAIN ≈ 3 ( V IN ) 2
45 A
( 2 )( 3 )
( 2 ? )( 1000 pF )
The numbers above represent the values at V IN = 12V. It
can be seen from this simple example that two things can
be done to improve efficiency: 1) Use two MOSFETs on the
?
? ( 400 kHz ) = 6 . 3 W
? 1
? 5 V – 1 . 8 V
+
1 ?
1 . 8 V ?
synchronous side and 2) use a smaller MOSFET for the
main switch with smaller C MILLER to better balance the AC
loss with the DC loss. A smaller, less expensive MOSFET
This totals 1W at V IN = 8V, 2.25W at V IN = 12V and 6.25W
can actually perform better in the task of the main switch.
at V IN = 20V.
3733f
28
相关PDF资料
PDF描述
LTC3734EUH#TRPBF IC CTRLR DC/DC 1PH HI EFF 32QFN
LTC3735EUHF#TRPBF IC CTRLR DC/DC 2PH HI EFF 38-QFN
LTC3736EUF-1#TRPBF IC REG CTRLR BUCK PWM CM 24-QFN
LTC3736EUF#PBF IC REG CTRLR BUCK PWM CM 24-QFN
LTC3737EUF#TRPBF IC REG CTRLR BUCK PWM CM 24-QFN
相关代理商/技术参数
参数描述
LTC3733CG#PBF 功能描述:IC CTRLR BUCK AMD 3PHASE 36-SSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:43 系列:- 应用:控制器,Intel VR11 输入电压:5 V ~ 12 V 输出数:1 输出电压:0.5 V ~ 1.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:48-VFQFN 裸露焊盘 供应商设备封装:48-QFN(7x7) 包装:管件
LTC3733CG#TR 功能描述:IC CTRLR BUCK 3PH AMD CPU 36SSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:43 系列:- 应用:控制器,Intel VR11 输入电压:5 V ~ 12 V 输出数:1 输出电压:0.5 V ~ 1.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:48-VFQFN 裸露焊盘 供应商设备封装:48-QFN(7x7) 包装:管件
LTC3733CG#TRPBF 功能描述:IC CTRLR BUCK AMD 3PHASE 36-SSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:43 系列:- 应用:控制器,Intel VR11 输入电压:5 V ~ 12 V 输出数:1 输出电压:0.5 V ~ 1.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:48-VFQFN 裸露焊盘 供应商设备封装:48-QFN(7x7) 包装:管件
LTC3733CUHF-1 功能描述:IC CTRLR BUCK 3PH AMD CPU 38-QFN RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:43 系列:- 应用:控制器,Intel VR11 输入电压:5 V ~ 12 V 输出数:1 输出电压:0.5 V ~ 1.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:48-VFQFN 裸露焊盘 供应商设备封装:48-QFN(7x7) 包装:管件
LTC3733CUHF-1#PBF 功能描述:IC CTRLR BUCK 3PH AMD CPU 38-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:43 系列:- 应用:控制器,Intel VR11 输入电压:5 V ~ 12 V 输出数:1 输出电压:0.5 V ~ 1.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:48-VFQFN 裸露焊盘 供应商设备封装:48-QFN(7x7) 包装:管件