ml4872 Microsemi Corporation, ml4872 Datasheet - Page 4

• Manufacturer Part Number: ml4872
• Description: High Current Boost Regulator With Shutdown
• Manufacturer: Microsemi Corporation

ML4872
4
2
4
V IN
SHDN
R SENSE
+
–
A1
V L1
V L2
START-UP
I L
1
Figure 3. Inductor Current and Voltage Waveforms
V IN
100µF
I L(MAX)
V OUT
CONTROL
I SET
BOOST
Figure 2. PFM Regulator Block Diagram
0
0
Figure 1. Application Test Circuit
I L
Q2 OFF
Q1 ON
PWR GND
V L1
V IN
GND
SHDN
(Sumida CD75)
Q1
ML4870
20µH
PWR GND
Q1 OFF
6
Q2 ON
V L2
8
V OUT
V L2
NC
I SET
SYNCHRONOUS
200µF
CONTROL
RECTIFIER
I OUT
A3
+
–
Q2
A2
2.4V
GND
+
–
3
V OUT
5
V OUT