ml4851 Microsemi Corporation, ml4851 Datasheet - Page 4

• Manufacturer Part Number: ml4851
• Description: Current, Voltage Boost Regulator
• Manufacturer: Microsemi Corporation

ML4851
4
R
S
Figure 3. PFM Inductor Current Waveforms and Timing
Q
Q
V
IN
START-UP
Q(ONE SHOT)
1 F
100 F
INDUCTOR
CURRENT
Figure 2. PFM Regulator Block Diagram
V IN
July, 2000
ONE SHOT
Figure 1. Application Test Circuit
5µs
R
R
A
B
L1
Q1 & Q2 OFF
Q1 ON
V
V
GND
DETECT
IN
REF
(Sumida CD75)
V L
Q1
ML4851
6
27 H
PWR GND
RESET
V
ON
OUT
Q2
DATASHEET
V
A1
L
Q2
–
+
100 F
Q1 ON
A2
V REF
+
–
I
OUT
ON
Q2
V
OUT
V OUT
R1
R2
5
C1
+
V OUT
–