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參數(shù)資料
| 型號(hào)： | LTC3225EDDB-1#TRMPBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 0.175 A SWITCHED CAPACITOR CONVERTER, 1500 kHz SWITCHING FREQ-MAX, PDSO10 |
| 封裝： | 3 X 2 MM, LEAD FREE, PLASTIC, MO-229WECD-1, DFN-10 |
| 文件頁(yè)數(shù)： | 11/14頁(yè) |
| 文件大?。?/td> | 263K |
| 代理商： | LTC3225EDDB-1#TRMPBF |
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LTC3225/LTC3225-1
6
3225fb
SIMPLIFIED BLOCK DIAGRAM
The LTC3225/LTC3225-1 are dual cell supercapacitor char-
gers. Their unique topology maintains a constant output
voltage with programmable charge current. Their ability
to maintain equal voltages on both cells while charging
protects the supercapacitors from damage that is possible
with other charging methods, without the use of external
balancing resistors. The LTC3225/LTC3225-1 include an
internal switched capacitor charge pump to boost VIN to a
regulated output voltage. A unique architecture maintains
relatively constant input current for the lowest possible
input noise. The basic charger circuit requires only three
external components.
Figure 1
OPERATION
Normal Charge Cycle
Operation begins when the SHDN pin is pulled above 1.3V.
The COUT pin voltage is sensed and compared with a preset
voltage threshold using an internal resistor divider and
a comparator. The preset voltage threshold is selectable
with the VSEL pin. If the voltage at the COUT pin is lower
than the preset voltage threshold, the oscillator is enabled.
The oscillator operates at a typical frequency of 0.9MHz.
When the oscillator is enabled, the charge pump operates
charging up COUT. Each time the charge pump starts up
from shutdown, the input current drawn by the internal
charge pump ramps up at approximately 20mA/μs until it
reaches a level which is determined by RPROG.
–
+
–
+
CHARGE
PUMP
10
9
3
8
COUT
CTOP
CBOT
VIN
1.2V
1
3000i
CLK
RUN/STOP
C1
C2
2
C–
C+
4
SHDN
CX
5
PGOOD
3225 F01
GND
SOFT-START AND
SHUTDOWN CONTROL
THERMAL
PROTECTION
OSCILLATOR
VREF – 2%
VREF – 6%
VREF – 7.2%
1.088V (LTC3225)
1.067V (LTC3225-1)
1.2V
VREF
VSEL
6
PROG
RPROG
RUN
i
7
R1
R2
POR
UVLO
POR
VIN
CFLY
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| LTC3400BES6#PBF | 0.85 A SWITCHING REGULATOR, 1500 kHz SWITCHING FREQ-MAX, PDSO6 |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC3225EDDB-TRMPBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:150mA Supercapacitor Charger |
| LTC3225EDDB-TRPBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:150mA Supercapacitor Charger |
| LTC3226 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:2-Cell Supercapacitor Charger |
| LTC3226_12 | 制造商:LINEAR 制造商全稱:LINEAR 功能描述:2-Cell Supercapacitor Charger with Backup |
| LTC3226EUD | 制造商:LINEAR 制造商全稱:LINEAR 功能描述:2-Cell Supercapacitor Charger with Backup PowerPath Controller |
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