参数资料
| 型号： | LTC3780EG#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 24/30页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BST PWM CM 24-SSOP |
| 标准包装： | 59 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 440kHz |
| 占空比： | 99% |
| 电源电压： | 4 V ~ 36 V |
| 降压： | 是 |
| 升压： | 是 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 24-SSOP（0.209"，5.30mm 宽） |
| 包装： | 管件 |
| 产品目录页面： | 1336 (CN2011-ZH PDF) |
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LTC3780
APPLICATIONS INFORMATION
I IN , PEAK ( MAX , BUCK ) = 5 ? ? 1 +
? 29 % ?
2 ? ?
?
Double-check the T J in the MOSFET with 70°C ambient
temperature:
T J = 70°C + 1.94W ? 40°C/W = 147.6°C
The maximum power dissipation of switch B occurs in
buck mode. Assuming a junction temperature of T J = 80°C
with ρ 80°C = 1.2, the power dissipation at V IN = 18V is:
C IN is chosen to filter the square current in buck mode. In
this mode, the maximum input current peak is:
= 5 . 7 A
A low ESR (10mΩ) capacitor is selected. Input voltage
ripple is 57mV (assuming ESR dominate ripple).
P B,BUCK =
18 – 12
18
? 5 2 ? 1.2 ? 0.009 = 90mW
C OUT is chosen to filter the square current in boost mode.
In this mode, the maximum output current peak is:
? 5 ? ? 1 +
Double-check the T J in the MOSFET at 70°C ambient
temperature:
I OUT , PEAK ( MAX , BOOST ) =
12
5
?
?
11 % ?
2 ? ?
= 10 . 6 A
P C,BOOST = ( 12 – 5 ) ? 12 ? 5 2 ? 1.4 ? 0.009
+ 2 ? 12 3 ? ? 150p ? 400k = 1.27W
T J = 70°C + 0.09W ? 40°C/W = 73.6°C
The maximum power dissipation of switch C occurs in boost
mode. Assuming a junction temperature of T J = 110°C with
ρ 110°C = 1.4, the power dissipation at V IN = 5V is:
5 2
5
5
Double-check the T J in the MOSFET at 70°C ambient
temperature:
T J = 70°C + 1.08W ? 40°C/W = 113°C
The maximum power dissipation of switch D occurs
in boost mode when its duty cycle is higher than 50%.
Assuming a junction temperature of T J = 100°C with
ρ 100°C = 1.35, the power dissipation at V IN = 5V is:
A low ESR (5mΩ) capacitor is suggested. This capacitor
will limit output voltage ripple to 53mV (assuming ESR
dominate ripple).
PC Board Layout Checklist
The basic PC board layout requires a dedicated ground
plane layer. Also, for high current, a multilayer board
provides heat sinking for power components.
? The ground plane layer should not have any traces and
it should be as close as possible to the layer with power
MOSFETs.
? Place C IN , switch A, switch B and D1 in one com-
pact area. Place C OUT , switch C, switch D and D2 in
one compact area. One layout example is shown in
Figure 10.
5 ? 12
?
P D , BOOST = ? ? ? 5 ? ? 1 . 35 ? 0 . 009 = 0 . 73 W
2
12 ? 5 ?
Double-check the T J in the MOSFET at 70°C ambient
temperature:
T J = 70°C + 0.73W ? 40°C/W = 99°C
V IN
C IN
QA
D1
SW2
QB
L
SW1
QC
D2
QD
V OUT
C OUT
R SENSE
LTC3780
CKT
GND
3780 F10
Figure 10. Switches Layout
3780ff
24
For more information www.linear.com/LTC3780
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| LTC3780EUH#PBF | 功能描述:IC REG CTRLR BST PWM CM 32-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 特色产品:LM3753/54 Scalable 2-Phase Synchronous Buck Controllers 标准包装:1 系列:PowerWise® PWM 型:电压模式 输出数:1 频率 - 最大:1MHz 占空比:81% 电源电压:4.5 V ~ 18 V 降压:是 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-5°C ~ 125°C 封装/外壳:32-WFQFN 裸露焊盘 包装:Digi-Reel® 产品目录页面:1303 (CN2011-ZH PDF) 其它名称:LM3754SQDKR |
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