ml4870 Microsemi Corporation, ml4870 Datasheet - Page 4

• Manufacturer Part Number: ml4870
• Description: High Current Boost Regulator With Load Disconnect
• Manufacturer: Microsemi Corporation

ML4870
4
2
V IN
R SENSE
+
–
A1
SHDN
V L1
START-UP
1
V L2
I L
CONTROL
V IN
I L(MAX)
BOOST
Figure 3. Inductor Current and Voltage Waveforms
100µF
V OUT
I SET
Figure 2. PFM Regulator Block Diagram
0
0
I L
Figure 1. Application Test Circuit
PWR GND
Q2 OFF
Q1 ON
Q1
V L1
V IN
GND
SHDN
(SUMIDA CD75)
6
V L2
8
ML4870
27µH
Q1 OFF
Q2 ON
PWR GND
V OUT
V L2
SYNCHRONOUS
NC
CONTROL
RECTIFIER
100µF
A3
+
–
I OUT
Q2
Q3
A2
2.4V
GND
+
–
3
SHUTDOWN
CONTROL
SHDN
V OUT
4
5
V OUT