参数资料
| 型号： | LT3431IFE#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 11/28页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK ADJ 3A 16TSSOP |
| 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： | 1.2 V ~ 48 V |
| 输入电压： | 5.5 V ~ 60 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 500kHz |
| 电流 - 输出： | 3A |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-TSSOP（0.173"，4.40mm）裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 16-TSSOP-EP |
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LT3431
APPLICATIO S I FOR ATIO
there are no helpful guidelines to calculate when the
magnetic field radiation will be a problem.
Table 2
fall off at high duty cycles. Most current mode converters
suffer a drop off of peak switch current for duty cycles
above 50%. This is due to the effects of slope compensa-
tion required to prevent subharmonic oscillations in cur-
VENDOR/
PART NUMBER
Sumida
CDRH8D28-4R7
CDRH8D28-7R3
CDRH8D43-100
CDRH8D43-150
CEI122-100
CEI122(H)-150
CDRH104R-150
CDRH104R-220
CDRH124-330
Coiltronics
UP2B-6R8
UP2B-100
UP3B-220
VALUE
( μ H)
4.7
7.3
10
15
10
15
15
22
33
6.8
10
22
I DC
(Amps)
3.4
2.8
4
2.9
3.4
3.6
3.6
2.9
2.9
3.6
3.3
3.7
DCR
(Ohms)
0.019
0.030
0.029
0.042
0.029
0.071
0.037
0.054
0.066
0.020
0.027
0.049
HEIGHT
(mm)MAX
3
3
4.5
4.5
3
3
4
4
4.5
6
6
6.8
rent mode converters. (For detailed analysis, see Applica-
tion Note 19.)
The LT3431 is able to maintain peak switch current limit
over the full duty cycle range by using patented circuitry to
cancel the effects of slope compensation on peak switch
current without affecting the frequency compensation it
provides.
Maximum load current would be equal to maximum
switch current for an infinitely large inductor, but with
finite inductor size, maximum load current is reduced by
one-half peak-to-peak inductor current (I LP-P ). The follow-
ing formula assumes continuous mode operation, imply-
ing that the term on the right is less than one-half of I P .
I OUT(MAX) =
Continuous Mode
UP3B-330
Coilcraft
DO1813P-472
DS3316P-472
33
4.7
4.7
3.0
2.6
3.2
0.069
0.054
0.054
6.8
5
5.08
I P –
I LP-P
2
= I P ?
(
V OUT + V F ) ( V IN ? V OUT – V F
2 ( L )( f )( V IN )
)
DS3316P-682
DO3316P-103
6.8
10
2.8
3.8
0.075
0.038
5.08
5.21
For V OUT = 5V, V IN = 12V, V F(D1) = 0.52V, f = 500kHz
and L = 10 μ H:
( 5 + 0 . 52 ) ( 12 ? 5 – 0 . 52 )
2 ( )( ) ( )
( 5 + 0 . 52 ) ( 24 ? 5 – 0 . 52 )
2 ( )( ) ( 24 )
I OUT ( MAX ) = 3 ?
15 ? 10 500 ? 10 3
DO3316P-153 15 3.0 0.046 5.21
Additional Considerations
After making an initial choice, consider additional factors
such as core losses and second sourcing, etc. Use the
experts in Linear Technology’s Applications department if
you feel uncertain about the final choice. They have
experience with a wide range of inductor types and can tell
you about the latest developments in low profile, surface
mounting, etc.
Maximum Output Load Current
Maximum load current for a buck converter is limited by
the maximum switch current rating (I P ). The current rating
I OUT ( MAX ) = 3 ? 15 ? 10 ? 6 500 ? 10 3 12
= 3 ? 0 . 3 = 2 . 7 A
Note that there is less load current available at the higher
input voltage because inductor ripple current increases. At
V IN = 24V, duty cycle is 23% and for the same set of
conditions:
? 6
= 3 ? 0 . 43 = 2 . 57 A
for the LT3431 is 3A. Unlike most current mode convert-
ers, the LT3431 maximum switch current limit does not
sn3431 3431fs
11
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| LT3433 | 制造商:LINER 制造商全称:Linear Technology 功能描述:High Voltage Step-Up/Step-Down DC/DC Converter |
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| LT3433EFE | 功能描述:IC REG BUCK BST ADJ 0.5A 16TSSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:2,500 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V，1.5V，1.8V，2.5V 输入电压:2.7 V ~ 20 V PWM 型:- 频率 - 开关:- 电流 - 输出:50mA 同步整流器:是 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 包装:带卷 (TR) 供应商设备封装:10-MSOP 裸露焊盘 |
| LT3433EFE#PBF | 功能描述:IC REG BUCK BST ADJ 0.5A 16TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:250 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V 输入电压:2.05 V ~ 6 V PWM 型:电压模式 频率 - 开关:2MHz 电流 - 输出:500mA 同步整流器:是 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:6-UFDFN 包装:带卷 (TR) 供应商设备封装:6-SON（1.45x1） 产品目录页面:1032 (CN2011-ZH PDF) 其它名称:296-25628-2 |
| LT3433EFE#TR | 功能描述:IC REG BUCK BST ADJ 0.5A 16TSSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:2,500 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V，1.5V，1.8V，2.5V 输入电压:2.7 V ~ 20 V PWM 型:- 频率 - 开关:- 电流 - 输出:50mA 同步整流器:是 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 包装:带卷 (TR) 供应商设备封装:10-MSOP 裸露焊盘 |
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