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参数资料
| 型号： | LT3502IDC#TRM |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | 1.1 A SWITCHING REGULATOR, 1400 kHz SWITCHING FREQ-MAX, PDSO10 |
| 封装： | 2 X 2 MM, PLASTIC, DFN-10 |
| 文件页数： | 6/20页 |
| 文件大小： | 457K |
| 代理商： | LT3502IDC#TRM |
LT3502/LT3502A
14
3502f
APPLICATIONS INFORMATION
Figure 8b. Diode D4 Prevents a Shorted Input from Discharging
a Backup Battery Tied to the Output; it Also Protects the Circuit
from a Reversed Input. The LT3502/LT3502A Runs Only When
the Input is Present
VIN
3502 F08b
SHDN
BOOST
SW
LT3502A
BD
D4
GND
DA
FB
VIN
VOUT
+
Figure 8a. The LT3502A Reduces its Frequency to Below 250kHz
to Protect Against Shorted Output with 40V Input
VSW
10V/DIV
2
μs/DIV
VIN = 40V
VOUT = 0V
L = 6.8
μH
COUT = 10μF
3502 F08a
IL
500mA/DIV
RUN
VSW
10V/DIV
VIN = 12V
VOUT = 3.3V
L = 6.8
μH
COUT = 10μF
VOUT
2V/DIV
5
μs/DIV
IL
500mA/DIV
VSW
10V/DIV
VIN = 12V
VOUT = 3.3V
L = 6.8
μH
COUT = 10μF
VOUT
2V/DIV
50
μs/DIV
3502 F07
IL
500mA/DIV
SHDN
GND
3502 F07a
RUN
50k
0.1
μF
SHDN
GND
3502 F07b
Figure 7. To Soft Start the LT3502A, Add a Resistor and Capacitor to the
SHDN Pin
Application Note 88 for a complete discussion). The low
loss ceramic capacitor combined with stray inductance in
series with the power source forms an underdamped tank
circuit, and the voltage at the VINpinoftheLT3502/LT3502A
can ring to twice the nominal input voltage, possibly ex-
ceeding the LT3502/LT3502A’s rating and damaging the
part. If the input supply is poorly controlled or the user
will be plugging the LT3502/LT3502A into an energized
supply, the input network should be designed to prevent
this overshoot. Figure 9 shows the waveforms that result
when an LT3502/LT3502A circuit is connected to a 24V
supply through six feet of 24-gauge twisted pair. The rst
plot is the response with a 2.2μF ceramic capacitor at the
input. The input voltage rings as high as 35V and the input
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| LT3502IDC | 1.1 A SWITCHING REGULATOR, 1400 kHz SWITCHING FREQ-MAX, PDSO10 |
| LT3502EDC | 1.1 A SWITCHING REGULATOR, 1400 kHz SWITCHING FREQ-MAX, PDSO10 |
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| LT3502IMS#PBF | 功能描述:IC REG BUCK ADJ 0.5A 10MSOP 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: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 |
| LT3502IMS#TRPBF | 功能描述:IC REG BUCK ADJ 0.5A 10MSOP 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: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 |
| LT3502IMS-PBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:1.1MHz/2.2MHz, 500mA Step-Down Regulators in 2mm × 2mm DFN and MS10 |
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