ncp1521b ON Semiconductor, ncp1521b Datasheet - Page 2

• Manufacturer Part Number: ncp1521b
• Description: 1.5 Mhz, 600 Ma Stepdown Dcdc Converter
• Manufacturer: ON Semiconductor

V
Enable
battery
4.7 mF
GND
VIN
EN
1
2
3
SHUTDOWN
& THERMAL
CONTROL
100%
95%
90%
85%
80%
75%
70%
65%
60%
55%
50%
LOGIC
0
CONTROL
PWM/PFM
Figure 4. Simplified Block Diagram
100
Figure 3. Efficiency vs. Output Current
REFERENCE
VOLTAGE
200
Q1
I
LIMIT
http://onsemi.com
NCP1521B
Q2
300
I
OUT
2
(mA)
400
500
LX
FB
5
4
V
V
T
A
OUT
IN
= 25°C
600
= 4.2 V
= 3.3 V
2.2 mH
700
10 mF
R1
R2
18 pF