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NCP1521 Datasheet(PDF) 2 Page - ON Semiconductor

Part No. NCP1521
Description  1.5 MHz, 600 mA, High−Efficiency, Low Quiescent Current, Adjustable Output Voltage Step−Down Converter
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Maker  ONSEMI [ON Semiconductor]
Homepage  http://www.onsemi.com
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 2 page
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NCP1521
http://onsemi.com
2
Vout = 3.3 V
Vin = 4.2 V
TA = 25Ā°C
100
90
80
70
60
50
500
600
400
300
200
100
0
Iout (mA)
Figure 3. Efficiency vs. Output Current
GND
2
VIN
1
Vbattery
4.7
mF
EN
3
Enable
LOGIC
CONTROL
& THERMAL
SHUTDOWN
PWM/PFM
CONTROL
ILIMIT
REFERENCE
VOLTAGE
FB
4
LX
5
Q1
10
mF
18 pF
R1
R2
2.2
mH
Q2
Figure 4. Simplified Block Diagram




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