ml4895 Microsemi Corporation, ml4895 Datasheet - Page 5

• Manufacturer Part Number: ml4895
• Description: Synchronous Buck Controller
• Manufacturer: Microsemi Corporation

10
Figure 2. ON-Time vs. Input Voltage
OSCILLATOR
8
6
4
2
0
ONE SHOT
5
7.5
COMPARATOR
t ON
CURRENT
R
S
V IN (V)
10
Q
Q
+
-
Figure 1. ML4895 Functional Block Diagram
12.5
TRANSCONDUCTANCE
V SR
AMPLIFIER
SYNCHRONOUS
COMPARATOR
RECTIFIER
SHOOT-THRU
PROTECTION
15
R gm
+
+
-
-
-7mV
2.5V
N DRV
I SENSE
P DRV
V FB
Figure 3. Volt-seconds vs. Input Voltage
30
25
20
15
10
5
0
5
7
6
3
2
V OUT = 2.5V
V OUT = 3.3V
V OUT = 4.0V
7.5
V IN
R SENSE
I L
L1
C OUT
V IN (V)
10
C IN
12.5
R1
R2
ML4895
V OUT
+
–
15
5