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参数资料
| 型号： | YB1300ST26S500 |
| 厂商： | YOBON TECHNOLOGIES, INC. |
| 英文描述： | Switched Capacitor Boost Converter 5V/4.5V |
| 中文描述： | 开关电容升压转换器5V/4.5V |
| 文件页数： | 6/8页 |
| 文件大小： | 373K |
| 代理商： | YB1300ST26S500 |
YB1300S
Switched Capacitor Boost Converter 5V/4.5V
YB1300S MRev.1.0
www.yobon.com.tw
6
Boost Feedback &
Timing Control Block
1MHz
Oscillator
Thermal
Protection
VREF
2
1
4
3
Short-Circuit
Protection
Current Bias
Generator
Chip
Enable
5
6
VIN
EN
CN
CP
BOOST DRIVER
VOUT
GND
COUT
CIN
Cpump
Soft-Start
Circuit
Figure 3. Block Diagram
Functional Block
Functional Description
The YB1300S regulated charge pump
provides a regulated 5V output voltage for
input voltages between 2.7V and 5V. This is
accomplished by a step-up or boost mode
of operation. A conversion clock of 50%
duty cycle is generated. During the first half
cycle,
the
pumping
capacitor
CPUMP
charges to VIN. During the second half
cycle, the voltage on CPUMP is added to VIN,
then deliver to VOUT. The output voltage is
regulated by skipping clock cycles as
necessary.
Soft-Start and Short-Circuit Protection
Circuitry
The YB1300S includes soft-start circuitry to
limit inrush current at turn-on. When
starting up, the output capacitor is charged
through the charge-pump capacitor with a
limited current source. When the output
voltage approached to its design value, the
soft-start
is
terminated
and
normal
operation begins. If an overload condition
occurs, for example, the output is shorted
to ground, the output current is limited by
the YB1300S switching technique.
Thermal Protection
The regulator has thermal shutdown
circuitry that protects it from damage
caused by high temperature conditions.
The thermal protection circuitry shut down
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