参数资料
| 型号： | BD9140MUV-E2 |
| 厂商： | Rohm Semiconductor |
| 文件页数： | 11/21页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 2A VQFN020 |
| 标准包装： | 2,500 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 2.5 V ~ 6 V |
| 输入电压： | 4.5 V ~ 13.2 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 500kHz |
| 电流 - 输出： | 2A |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 105°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-VFQFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | VQFN020V4040 |
BD9141MUV
● Switching Regulator Efficiency
Efficiency ? may be expressed by the equation shown below:
Datasheet
η =
V OUT × I OU T
Vin × Iin
× 100[%]=
P OUT
Pin
× 100[%]=
P OUT
P OUT +P D α
× 100[%]
1) ON resistance dissipation of inductor and FET ： PD(I R)
1)PD(I R)=I OUT × (R COIL +R ON ) (R COIL [ Ω ] ： DC resistance of inductor, R ON [ Ω ] ： ON resistance of FET, I OUT [A] ： Output
2)PD(Gate)=Cgs × f × V
(Cgs[F] ： Gate capacitance of FET, f[H] ： Switching frequency, V[V] ： Gate driving voltage of FET)
Vin × C RSS × I OUT × f
I DRIVE
4)PD(ESR)=I RMS × ESR (I RMS [A] ： Ripple current of capacitor, ESR[ Ω ] ： Equivalent series resistance.)
Efficiency may be improved by reducing the switching regulator power dissipation factors P D α as follows:
Dissipation factors:
2
2) Gate charge/discharge dissipation ： PD(Gate)
3) Switching dissipation ： PD(SW)
4) ESR dissipation of capacitor ： PD(ESR)
5) Operating current dissipation of IC ： PD(IC)
2 2
current.)
2
2
3)PD(SW)= (C RSS [F] ： Reverse transfer capacitance of FET, I DRIVE [A] ： Peak current of gate.)
2
5)PD(IC)=Vin × I CC (I CC [A] ： Circuit current.)
● Consideration on Permissible Dissipation and Heat Generation
As this IC functions with high efficiency without significant heat generation in most applications, no special consideration is
needed on permissible dissipation or heat generation. In case of extreme conditions, however, including lower input
voltage, higher output voltage, heavier load, and/or higher temperature, the permissible dissipation and/or heat generation
must be carefully considered.
For dissipation, only conduction losses due to DC resistance of inductor and ON resistance of FET are considered.
Because the conduction losses are considered to play the leading role among other dissipation mentioned above including
gate charge/discharge dissipation and switching dissipation.
4 layers (Copper foil area : 5505mm )
①
P=I OUT × R ON
4.0
3.0
2.0
1.0
① 3.56W
② 2.21W
③ 0.70W
2
copper foil in each layers.
θ j-a=35.1 ℃ /W
② 4 layers (Copper foil area : 10.29m 2 )
copper foil in each layers.
θ j-a=56.6 ℃ /W
③ 4 layers (Copper foil area : 10.29m 2 )
θ j-a=178.6 ℃ /W
④ IC only.
θ j-a=367.6 ℃ /W
2
R ON =D × R ONP +(1-D)R ONN
D ： ON duty (=V OUT /V CC )
R COIL ： DC resistance of coil
R ONP ： ON resistance of P-channel MOS FET
R ONN ： ON resistance of N-channel MOS FET
I OUT ： Output current
④ 0.34W
0
0
25
50
75
100 105 125
150
P=2 × 0.12375 ＝ 0.495[W]
Ambient temperature:Ta [ ℃ ]
Fig.27 Thermal derating curve
(VQFN020V4040)
If V CC =8V, V OUT =5V, R ONP =0.15 Ω , R ONN =0.08 Ω
I OUT =2A, for example,
D=V OUT /V CC =5/8=0.625
R ON =0.625 × 0.15+(1-0.625) × 0.08
=0.09375+0.03
=0.12375[ Ω ]
2
As R ONP is greater than R ONN in this IC, the dissipation increases as the ON duty becomes greater.
consideration on the dissipation as above, thermal design must be carried out with sufficient margin allowed.
With the
www.rohm.com
?2012 ROHM Co., Ltd. All rights reserved.
TSZ22111 ? 15 ? 001
11/19
TSZ02201-0J3J0AJ00180-1-2
02.MAR.2012 Rev.001
相关PDF资料 |
PDF描述 |
|---|---|
| BD9300F-E2 | IC REG CTRLR BST INV PWM 14-SOP |
| BD9302FP-E2 | IC REG BUCK ADJ 2A DL HSOP25 |
| BD9305AFVM-TR | IC REG CTRLR BUCK PWM 8-MSOP |
| BD9328EFJ-E2 | IC REG BUCK SYNC ADJ 2A 8HTSOP |
| BD9329AEFJ-E2 | IC REG BUCK SYNC ADJ 3A 8HTSOP |
相关代理商/技术参数 |
参数描述 |
|---|---|
| BD91411GW | 制造商:ROHM 制造商全称:Rohm 功能描述:Built-in OVP Micro USB Switch with USB2.0, MHLTM and Audio |
| BD91411GW-E2 | 制造商:ROHM 制造商全称:Rohm 功能描述:Built-in OVP Micro USB Switch with USB2.0, MHLTM and Audio |
| BD9141MUV | 制造商:ROHM 制造商全称:Rohm 功能描述:4.5V to 13.2V, 2A 1ch Synchronous Buck Converter integrated FET |
| BD9141MUV_12 | 制造商:ROHM 制造商全称:Rohm 功能描述:4.5V to 13.2V, 2A 1ch Synchronous Buck Converter integrated FET |
| BD9141MUV-E2 | 功能描述:开关变换器、稳压器与控制器 High Eff. Stepdown Sw Reg 2A 4.5-13.2V RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
发布紧急采购，3分钟左右您将得到回复。