ncp1521 ON Semiconductor, ncp1521 Datasheet - Page 2

• Manufacturer Part Number: ncp1521
• Description: 1.5 Mhz, 600 Ma, Highefficiency, Low Quiescent Current, Adjustable Output Voltage Stepdown Converter
• Manufacturer: ON Semiconductor

Vbattery
Enable
4.7 mF
GND
VIN
EN
1
2
3
SHUTDOWN
& THERMAL
CONTROL
100
LOGIC
90
80
70
60
50
0
CONTROL
PWM/PFM
Figure 2. Efficiency vs. Output Current
Figure 3. Simplified Block Diagram
100
REFERENCE
VOLTAGE
Q1
ILIMIT
http://onsemi.com
200
Q2
NCP1521
I
out
2
300
(mA)
400
V
V
T
A
out
in
LX
FB
= 25°C
5
4
= 4.2 V
= 3.3 V
500
2.2 mH
600
10 mF
R1
R2
18 pF