Datasheet

MAX8855/MAX8855A
Dual, 5A, 2MHz Step-Down Regulators
_______________________________________________________________________________________ 5
SWITCHING FREQUENCY
vs. TEMPERATURE
MAX8855/MAX8855A toc04
AMBIENT TEMPERATURE (°C)
SWITCHING FREQUENCY (kHz)
35
920
940
960
980
1000
1020
1040
1060
1080
1100
900
-40 -15 10 60 85
FEEDBACK VOLTAGE
vs. TEMPERATURE
MAX8855/MAX8855A toc05
AMBIENT TEMPERATURE (°C)
FEEDBACK VOLTAGE (mV)
35
592
594
596
598
600
602
604
606
608
610
590
-40 -15 10 60 85
SHUTDOWN SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX8855/MAX8855A toc06
SUPPLY VOLTAGE (V)
SHUTDOWN SUPPLY CURRENT (nA)
3.10
1
2
3
4
5
6
7
8
9
10
0
2.35 2.60 2.85 3.35
3.60
I
IN1
+ I
IN2
+ I
VDL
+ I
VDD
LOAD TRANSIENT
MAX8855/MAX8855A toc07
20
µ
s/div
I
OUT_
V
OUT_
1A/div
100mV/div
1.8V OUTPUT
3.0A
1.5A
1.5A
SWITCHING WAVEFORMS
MAX8855/MAX8855A toc08
400ns/div
I
L2
I
L1
V
LX2
V
LX1
2V/div
2V/div
2A/div
2A/div
SOFT-START AND SHUTDOWN
MAX8855/MAX8855A toc09
400µs/div
3A LOAD
I
IN2
V
OUT2
V
PWRGD2
V
EN2
5V/div
2V/div
1V/div
1A/div
Typical Operating Characteristics (continued)
(V
IN1
= V
IN2
= 3.3V, MAX8855/MAX8855A, circuit of Figure 6, T
A
= +25°C, unless otherwise noted.)