ml4871 Microsemi Corporation, ml4871 Datasheet - Page 4

• Manufacturer Part Number: ml4871
• Description: High Current Boost Regulator
• Manufacturer: Microsemi Corporation

ML4871
4
2
V IN
R SENSE
+
–
A1
V L1
V L2
I L
START-UP
Figure 3. Inductor Current and Voltage Waveforms.
1
V IN
I L(MAX)
100µF
V OUT
I SET
CONTROL
Figure 2. PFM Regulator Block Diagram.
BOOST
0
0
Figure 1. Application Test Circuit.
I L
Q2 OFF
Q1 ON
PWR GND
V L1
V IN
GND
DETECT
(Sumida CD75)
Q1
ML4871
20µH
Q1 OFF
PWR GND
Q2 ON
6
V OUT
RESET
V L2
8
V L2
I SET
SYNCHRONOUS
200µF
CONTROL
RECTIFIER
I OUT
A3
+
–
Q2
A2
1.25V
GND
+
–
3
V OUT
5
V OUT