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參數(shù)資料
| 型號： | MC33468 |
| 廠商： | ON SEMICONDUCTOR |
| 元件分類： | DC/DC變換器 |
| 英文描述： | 30-mA Switched-Cap DC-DC Converter with fixed 5-V Output 6-SOT-23 -40 to 85 |
| 中文描述： | 變頻微功耗的DC - DC轉換器 |
| 文件頁數(shù)： | 5/8頁 |
| 文件大?。?/td> | 101K |
| 代理商： | MC33468 |
MC33468
5
MOTOROLA ANALOG IC DEVICE DATA
Figure 6. Typical 2.0 V Application with MOSFET
VIN
VOUT
EXT
GND
VOUT
VDD
If input voltage is high enough, higher efficiency may be
obtained by using a MOSFET as the switch transistor, in
which no gate resistor or capacitor is needed.
MOSFET and BJT voltage rating (VDS and VCE) should be
high enough to allow for spikes in voltage.
Figure 7. Typical Application for Output Voltages Over 2.0 V
VIN
VOUT
EXT
GND
VOUT
VDD
D1
COUT
R1
R2
(2.0 V)
Q1
L1
Inductor (L1)
Diode (D1)
Capacitor (COUT)
Transistor (Q1)
Resistor (R1)
Resistor (R2)
CD54 (15 H)
MBRD540T1
47 F (Tantalum type)
MMFT3055VL
150 k
10 k
When choosing the output capacitor, ensure that the
capacitor voltage is higher than Vout. Select an inductor with
low DC resistance and high saturation. A Schottky diode is
recommended for a lower voltage drop and faster switching.
Use external resistors that are much smaller resistance than
the resistance internal to the IC (minimum of 2 M ). When R1
is much less than the internal resistance, the error is
minimized.
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