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参数资料
| 型号： | LT3503EDCB#TRMPBF |
| 厂商： | Linear Technology |
| 文件页数： | 15/20页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK ADJ 1A 6DFN |
| 标准包装： | 1 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 0.78 V ~ 16.2 V |
| 输入电压： | 3.6 V ~ 20 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 2.2MHz |
| 电流 - 输出： | 1A |
| 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： | 6-WFDFN 裸露焊盘 |
| 包装： | 标准包装 |
| 供应商设备封装： | 6-DFN-EP（2x3） |
| 产品目录页面： | 1331 (CN2011-ZH PDF) |
| 其它名称： | LT3503EDCB#TRMPBFDKR |
LT3503
APPLICATIO S I FOR ATIO
V IN
D4
V IN
BOOST
a live supply (see Linear Technology Application Note 88
for a complete discussion). The low loss ceramic capaci-
LT3503
tor combined with stray inductance in series with the
SHDN
GND
SW
FB
V OUT
BACKUP
power source forms an underdamped tank circuit, and the
voltage at the V IN pin of the LT3503 can ring to twice the
nominal input voltage, possibly exceeding the LT3503’s
rating and damaging the part. If the input supply is poorly
controlled or the user will be plugging the LT3503 into an
3503 F09
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 LT3503 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 LT3503 circuits. However, these ca-
pacitors can cause problems if the LT3503 is plugged into
CLOSING SWITCH
SIMULATES HOT PLUG
energized supply, the input network should be designed to
prevent this overshoot.
Figure 10 shows the waveforms that result when an
LT3503 circuit is connected to a 20V supply through six
feet of 24-gauge twisted pair. The first plot is the response
with a 2.2 μ F ceramic capacitor at the input. The input
voltage rings as high as 35V and the input current peaks
at 20A. One method of damping the tank circuit is to add
another capacitor with a series resistor to the circuit. In
Figure 10b an aluminum electrolytic capacitor has been
added. This capacitor’s high equivalent series resistance
I IN
V IN
DANGER!
+
LT3503
2.2 μ F
V IN
20V/DIV
RINGING V IN MAY EXCEED
ABSOLUTE MAXIMUM
RATING OF THE LT3503
I IN
LOW
IMPEDANCE
ENERGIZED
20V SUPPLY
STRAY
INDUCTANCE
DUE TO 6 FEET
(2 METERS) OF
TWISTED PAIR
LT3503
5A/DIV
(10a)
V IN
20 μ s/DIV
+
10 μ F
35V
+
2.2 μ F
20V/DIV
AI.EI.
I IN
5A/DIV
1 ?
LT3503
(10b)
V IN
20 μ s/DIV
+
0.1 μ F
2.2 μ F
20V/DIV
I IN
5A/DIV
(10c)
20 μ s/DIV
3503 F10
Figure 10. A Well Chosen Input Network Prevents Input Voltage Overshoot and
Ensures Reliable Operation When the LT3503 is Connected to a Live Supply
3503f
15
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3504 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Quad 40V/1A Step-Down Switching Regulator |
| LT3504EUFD#PBF | 功能描述:IC REG BUCK ADJ 1A QUAD 28-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 设计资源:Design Support Tool 标准包装:1 系列:- 类型:升压（升压） 输出类型:固定 输出数:1 输出电压:3V 输入电压:0.75 V ~ 2 V PWM 型:- 频率 - 开关:- 电流 - 输出:100mA 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:SOT-23-5 细型，TSOT-23-5 包装:剪切带 (CT) 供应商设备封装:TSOT-23-5 其它名称:AS1323-BTTT-30CT |
| LT3504EUFD#TRPBF | 功能描述:IC REG BUCK ADJ 1A QUAD 28-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 设计资源:Design Support Tool 标准包装:1 系列:- 类型:升压（升压） 输出类型:固定 输出数:1 输出电压:3V 输入电压:0.75 V ~ 2 V PWM 型:- 频率 - 开关:- 电流 - 输出:100mA 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:SOT-23-5 细型，TSOT-23-5 包装:剪切带 (CT) 供应商设备封装:TSOT-23-5 其它名称:AS1323-BTTT-30CT |
| LT3504IUFD#PBF | 功能描述:IC REG BUCK ADJ 1A QUAD 28-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 设计资源:Design Support Tool 标准包装:1 系列:- 类型:升压（升压） 输出类型:固定 输出数:1 输出电压:3V 输入电压:0.75 V ~ 2 V PWM 型:- 频率 - 开关:- 电流 - 输出:100mA 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:SOT-23-5 细型，TSOT-23-5 包装:剪切带 (CT) 供应商设备封装:TSOT-23-5 其它名称:AS1323-BTTT-30CT |
| LT3504IUFD#TRPBF | 功能描述:IC REG BUCK ADJ 1A QUAD 28-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 设计资源:Design Support Tool 标准包装:1 系列:- 类型:升压（升压） 输出类型:固定 输出数:1 输出电压:3V 输入电压:0.75 V ~ 2 V PWM 型:- 频率 - 开关:- 电流 - 输出:100mA 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:SOT-23-5 细型，TSOT-23-5 包装:剪切带 (CT) 供应商设备封装:TSOT-23-5 其它名称:AS1323-BTTT-30CT |
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