MAX8643 Maxim Integrated Products, MAX8643 Datasheet - Page 5

• Manufacturer Part Number: MAX8643
• Description: 2MHz Step-Down Regulator
• Manufacturer: Maxim Integrated Products

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(Typical values are at V
100
95
90
85
80
75
70
65
60
0.1
V
V
EFFICIENCY vs. OUTPUT CURRENT
IN
DD
= 2.5V
= 3.3V
V
V
I
V
V
OUT
OUT
OUT
OUT
EN
OUTPUT CURRENT (A)
= 1.2V
V
OUT
_______________________________________________________________________________________
= 1.5V
SOFT-START WAVEFORMS
1
IN
V
OUT
= V
LOAD TRANSIENT
= 1.8V
DD
400μs/div
40μs/div
= 3.3V, V
R
LOAD
V
IN
10
= V
= 1Ω
DD
OUT
= 3.3V
MAX8643 toc08
MAX8643 toc06
3A, 2MHz Step-Down Regulator
= 1.8V, R
1950
1800
1650
1500
1350
1200
1050
Typical Operating Characteristics (continued)
900
2V/div
0V
1V/div
0V
AC-COUPLED
50mV/div
1A/div
0A
2.2
FREQUENCY vs. INPUT VOLTAGE
FREQ
2.6
= 50kΩ, I
-40°C
with Integrated Switches
-40°C
INPUT VOLTAGE (V)
3.0
+25°C
OUT
+25°C
V
V
OUT
V
V
OUT
I
LX
LX
EN
= 3A, and T
3.4
+85°C
+85°C
SWITCHING WAVEFORMS
SHUTDOWN WAVEFORMS
3.8
A
= +25°C, unless otherwise noted.)
100ns/div
10μs/div
-0.02
-0.04
-0.06
-0.08
-0.10
-0.12
-0.14
-0.16
R
0
LOAD
0
= 1Ω
V
OUT
MAX8643 toc07
MAX8643 toc09
1
= 1.8V
LOAD REGULATION
LOAD CURRENT (A)
V
OUT
2
AC-COUPLED
20mV/div
2A/div
0A
2V/div
0V
2V/div
0V
1V/div
0V
= 1.2V
V
OUT
3
V
IN
= 2.5V
= V
DD
4
= 3.3V
5
5