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ML4865
VIN
100µF
ML4865
SENSE
GND
VOUT
SHDN
VIN
VL2
VL1 PWR GND
27µH
(Sumida CD75)
Figure 1. Application Test Circuit
IOUT
100µF
VIN
3
VIN
L1
4
VL1
150mΩ
6
VL2
Q3
SHUTDOWN
CONTROL
SHDN
7
A1
+
–
Q2
A2
VOUT
8
Q1
BOOST
CONTROL
ISET
A3
FEEDBACK
CONTROL
2.42V
R1
SENSE
1
R2
Figure 2. PFM Regulator Detailed Block Diagram
+
C1 VOUT
–
IL(MAX)
IL
ISET
0
VOUT
VL
0
Q1 ON
Q2 OFF
Q1 OFF
Q2 ON
Figure 3. Inductor Current and Voltage Waveforms
4