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| 型号： | LT3479EDE#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 11/20页 |
| 文件大小： | 0K |
| 描述： | IC REG BOOST INV ADJ 3A 14DFN |
| 标准包装： | 91 |
| 类型： | 升压（升压），反相 |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 1.24 V ~ 42 V |
| 输入电压： | 2.5 V ~ 24 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 200kHz ~ 3.5MHz |
| 电流 - 输出： | 3A |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 14-WFDFN 裸露焊盘 |
| 包装： | 管件 |
| 供应商设备封装： | 14-DFN-EP（4x3） |
| 产品目录页面： | 1331 (CN2011-ZH PDF) |
LT3479
APPLICATIONS INFORMATION
Increasing switching frequency reduces output voltage
ripple but also reduces ef?ciency. The user should set
the frequency for the maximum tolerable output voltage
ripple. Figure 8 shows a reduction in ef?ciency of about
4% between 1MHz and 2MHz operation in a typical
application.
Inrush Current Protection
The LT3479 features a novel inductor current sensing
circuit that protects the LT3479 during hot plugging and
short circuits. An internal resistor in series with the ex-
ternal inductor senses the inductor current at all times.
When it exceeds 5A, a soft-start cycle is initiated. Figure 9
3.5
3.0
2.5
2.0
1.5
1.0
shows an output overload with inrush current protection
disabled. Notice that soft-start remains high, and that
the inductor current does not return to zero. Figure 10
illustrates the bene?ts of inrush current protection. The
output short initiates a new soft start cycle reducing the
inductor current. After the fault has passed, the inductor
current slowly returns to its equilibrium value. To ensure
bond wire integrity, the inductor current should not exceed
8A for more than 10ms.
Bypassing the 8.5mΩ inductor current sense resistor
disables inrush current protection. Connect the inductor
supply trace and bypass capacitor to the L pin and leave
the V S pin open to disable this feature.
V SW
10V/DIV
I L
4V/DIV
V SS
2V/DIV
V OUT
20V/DIV
0.5
20μs/DIV
Figure 9. Output Overload with
3479 F09
0
0.1
10
100
Inrush Current Protection Enabled
R T (kΩ)
3479 F07
Figure 7. Switching Frequency
V SW
10V/DIV
90
85
80
75
1MHz
2MHz
I L
4V/DIV
V SS
2V/DIV
V OUT
20V/DIV
70
20μs/DIV
3479 F10
65
Figure 10. Output Overload with
Inrush Current Protection Disabled
60
55
V IN
V OUT
50
0
0.2
0.4
I OUT (A)
0.6
0.8
LT3479
BOOST
REGULATOR
0.5Ω
3479 F08
Figure 8. Ef?ciency vs Switching Frequency
3479 F11
Figure 11. Circuit for Output Overload
3479fc
11
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3479EDE-TR | 制造商:LINER 制造商全称:Linear Technology 功能描述:3A, Full Featured DC/DC Converter with Soft-Start and Inrush Current Protection |
| LT3479EDE-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:3A, Full Featured DC/DC Converter with Soft-Start and Inrush Current Protection |
| LT3479EFE | 制造商:Linear Technology 功能描述:Conv DC-DC Single Step Up 2.5V to 24V 16-Pin TSSOP EP |
| LT3479EFE#PBF | 功能描述:IC REG BOOST INV ADJ 3A 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 |
| LT3479EFE#TR | 制造商:Linear Technology 功能描述:Conv DC-DC Single Step Up 2.5V to 24V 16-Pin TSSOP EP T/R |
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