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LTC3200

更新时间： 2024-11-10 14:57:55
品牌 Logo 应用领域
亚德诺 - ADI 泵转换器
页数 文件大小 规格书
12页 179K
描述
低噪声、稳压充电泵 DC/DC 转换器

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中文翻译

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LTC3200 数据手册

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LTC3200/LTC3200-5  
Low Noise, Regulated  
Charge Pump DC/DC Converters  
U
FEATURES  
DESCRIPTIO  
The LTC®3200/LTC3200-5 are low noise, constant fre-  
quency switched capacitor voltage doublers. They pro-  
duce a regulated output voltage from a 2.7V to 4.5V input  
with up to 100mA of output current. Low external parts  
count (one flying capacitor and two small bypass capaci-  
tors at VIN and VOUT) make the LTC3200/LTC3200-5  
ideally suited for small, battery-powered applications.  
■
Low Noise Constant Frequency Operation  
■
Output Current: 100mA  
■
Available in 8-Pin MSOP (LTC3200) and Low  
Profile (1mm) 6-Pin ThinSOTTM (LTC3200-5)  
Packages  
2MHz Switching Frequency  
Fixed 5V ± 4% Output (LTC3200-5) or ADJ  
VIN Range: 2.7V to 4.5V  
Automatic Soft-Start Reduces Inrush Current  
No Inductors  
ICC <1µA in Shutdown  
■
■
■
■
■
■
A new charge-pump architecture maintains constant  
switching frequency to zero load and reduces both output  
and input ripple. The LTC3200/LTC3200-5 have thermal  
shutdown capability and can survive a continuous short-  
circuit from VOUT to GND. Built-in soft-start circuitry  
prevents excessive inrush current during start-up.  
U
APPLICATIO S  
■
White LED Backlighting  
Highswitchingfrequencyenablestheuseofsmallceramic  
capacitors. A low current shutdown feature disconnects  
the load from VIN and reduces quiescent current to <1µA.  
■
Li-Ion Battery Backup Supplies  
■
Local 3V to 5V Conversion  
■
Smart Card Readers  
■
PCMCIA Local 5V Supplies  
The LTC3200 is available in an 8-pin MSOP package and  
the LTC3200-5 is available in a 6-pin ThinSOT.  
, LTC and LT are registered trademarks of Linear Technology Corporation.  
ThinSOT is a trademark of Linear Technology Corporation.  
U
TYPICAL APPLICATIO  
Output Ripple Voltage vs Load Current  
40  
Regulated 5V Output from a 2.7V to 4.5V Input  
V
C
A
= 3V  
FLY  
= 25°C  
IN  
= 1µF  
1µF  
T
30  
20  
10  
0
4
6
+
–
C
C
C
= 1µF  
OUT  
LTC3200-5  
V
IN  
2.7V TO 4.5V  
1µF  
5
2
3
1
V
V
= 5V ±4%  
OUT  
V
IN  
OUT  
I
UP TO 40mA, V ≥ 2.7V  
OUT  
OUT  
IN  
1µF  
C
= 2.2µF  
I
UP TO 100mA, V ≥ 3.1V  
OUT  
IN  
GND  
SHDN  
OFF ON  
ALL CAPACITORS = MURATA GRM 39X5R105K6.3AJ  
OR TAIYO YUDEN JMK107BJ105MA  
50  
75  
0
100  
25  
3200-5 TA01  
OUTPUT CURRENT (mA)  
3200 TA02  
1
1234567...12

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