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参数资料
| 型号： | LT1172HVIQ#TRPBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | 3.5 A SWITCHING REGULATOR, 115 kHz SWITCHING FREQ-MAX, PSSO5 |
| 封装： | LEAD FREE, PLASTIC, D2PAK-5 |
| 文件页数： | 4/24页 |
| 文件大小： | 225K |
| 代理商： | LT1172HVIQ#TRPBF |
LT1170/LT1171/LT1172
12
117012fg
TYPICAL APPLICATIONS (Note that maximum output currents are divided by 2 for LT1171, by 4 for LT1172.)
LCD Contrast Supply
C4
0.047μF
VOUT
–10V TO –26V
1170/1/2 TA04
R3
15k
OPTIONAL
SHUTDOWN
R2
100k
R1
200k
C1
1μF
TANTALUM
D1
1N914
C3
0.0047μF
C2***
2μF
TANTALUM
D2
VN2222
5V*
L1**
50μH
VBAT*
3V TO 20V
VIN
VC
FB
VSW
LT1172
E2
E1
GND
D3
*
**
***
D2, D3 = ER82.004 600mA SCHOTTKY. OTHER FAST SWITCHING TYPES MAY BE USED.
VIN AND BATTERY MAY BE TIED TOGETHER. MAXIMUM VALUE FOR VBAT IS EQUAL TO THE |NEGATIVE OUTPUT| + 1V. WITH HIGHER
BATTERY VOLTAGES, HIGHEST EFFICIENCY IS OBTAINED BY RUNNING THE LT1172 VIN PIN FROM 5V. SHUTTING OFF THE 5V SUPPLY
WILL AUTOMATICALLY TURN OFF THE LT1172. EFFICIENCY IS ABOUT 80% AT IOUT = 25mA.
R1, R2, R3 ARE MADE LARGE TO MINIMIZE BATTERY DRAIN IN SHUTDOWN, WHICH IS APPROXIMATELY VBAT /(R1 + R2 + R3).
FOR HIGH EFFICIENCY, L1 SHOULD BE MADE ON A FERRITE OR MOLYPERMALLOY CORE. PEAK INDUCTOR CURRENTS ARE ABOUT
600mA AT POUT = 0.7Ω. INDUCTOR SERIES RESISTANCE SHOULD BE LESS THAN 0.4Ω FOR HIGH EFFICIENCY.
OUTPUT RIPPLE IS ABOUT 200mVP-P TO 400mVP-P WITH C2 = 2μF TANTALUM. IF LOWER RIPPLE IS DESIRED, INCREASE C2, OR ADD
A 10Ω, 1μF TANTALUM OUTPUT FILTER.
+
Driving High Voltage FET
(for Off-Line Applications, See AN25)
External Current Limit
1170/1/2 TA05
VIN
VSW
LT1170
GND
10V TO
20V
D1
+
D
G
Q1
1170/1/2 TA06
VX
D1
LT1170
GND
R2
≈ 2V
VC
R1
500Ω
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT1172I | 制造商:LINER 制造商全称:Linear Technology 功能描述:100kHz, 5A, 2.5A and 1.25A High Efficiency Switching Regulators |
| LT1172IN8 | 功能描述:IC REG MULTI CONFIG ADJ 8DIP 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 |
| LT1172IN8#PBF | 功能描述:IC REG MULTI CONFIG ADJ 8DIP 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 |
| LT1172IN8#PBF | 制造商:Linear Technology 功能描述:IC, SWITCHING REGULATOR, 8-DIP |
| LT1172IN8#TRPBF | 制造商:Linear Technology 功能描述:Conv DC-DC Single Non-Inv/Inv/Step Up/Step Down 3V to 40V 8-Pin PDIP N T/R |
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