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| 型号： | LT3505IDD#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 17/24页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK ADJ 1.2A 8DFN |
| 标准包装： | 121 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 0.78 V ~ 33.8 V |
| 输入电压： | 3.6 V ~ 36 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 200kHz ~ 3.01MHz |
| 电流 - 输出： | 1.2A |
| 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： | 8-WFDFN 裸露焊盘 |
| 包装： | 管件 |
| 供应商设备封装： | 8-DFN-EP（3x3） |
LT3505
APPLICATIONS INFORMATION
RUN
V SW
5V/DIV
I L
1A/DIV
V OUT
2V/DIV
SHDN
GND
plications or in battery backup systems where a battery
or some other supply is diode OR-ed with the LT3505’s
output. If the V IN pin is allowed to ?oat and the SHDN pin
is held high (either by a logic signal or because it is tied
to V IN ), then the LT3505’s internal circuitry will pull its
quiescent current through its SW pin. This is ?ne if your
system can tolerate a few mA in this state. If you ground
the SHDN pin, the SW pin current will drop to essentially
zero. However, if the V IN pin is grounded while the output
is held high, then parasitic diodes inside the LT3505 can
pull large currents from the output through the SW pin
and the V IN pin. Figure 9 shows a circuit that will run only
when the input voltage is present and that protects against
a shorted or reversed input.
V IN = 12V
V OUT = 3.3V
L = 2.5 H
C OUT = 10 F
R T = 20.0k
10 s/DIV
3505 F08a
V IN
D4
V IN BOOST SW
V OUT
LT3505
RUN
SHDN
FB
15k
0.068 F
SHDN
GND
R T
GND
V C
BACKUP
3505 F09
10 s/DIV
V IN = 12V
V SW
5V/DIV
I L
1A/DIV
V OUT
2V/DIV
3505 F08b
V OUT = 3.3V
L = 2.5 H
C OUT = 10 F
R T = 20.0k
Figure 8. To Soft-Start the LT3505, Add a Resistor and Capacitor
to the SHDN pin. V IN = 12V, V OUT = 3.3V, C OUT = 10μF, R LOAD =
5 ? , R T = 20.0k, L = 2.5μH
Figure 9. 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 LT3505 Runs Only When the Input
is Present
Hot Plugging Safely
The small size, robustness and low impedance of ceramic
capacitors make them an attractive option for the input
bypass capacitor of LT3505 circuits. However, these ca-
pacitors can cause problems if the LT3505 is plugged into
a live supply (see Linear Technology 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 V IN pin of the LT3505 can ring to twice the nominal
input voltage, possibly exceeding the LT3505’s rating and
3505fc
17
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| LT3505IDD-TR | 制造商:LINER 制造商全称:Linear Technology 功能描述:1.2A, Step-Down Switching Regulator in 3mm × 3mm DFN |
| LT3505IDD-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:1.2A, Step-Down Switching Regulator in 3mm × 3mm DFN |
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| LT3505IMS8E#PBF | 功能描述:IC REG BUCK ADJ 1.2A 8MSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 产品培训模块:MIC23xxx HyperLight Load™ Regulators 标准包装:5,000 系列:HyperLight Load® 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.8V 输入电压:2.7 V ~ 5.5 V PWM 型:混合物 频率 - 开关:4MHz 电流 - 输出:2A 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:8-VFDFN 裸露焊盘，8-MLF? 包装:带卷 (TR) 供应商设备封装:8-MLF?（2x2） 产品目录页面:1094 (CN2011-ZH PDF) 其它名称:576-3303-2 |
| LT3505IMS8E#TRPBF | 功能描述:IC REG BUCK ADJ 1.2A 8MSOP 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 |
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