Datasheet

MAX8505
3A, 1MHz, 1% Accurate, Internal Switch
Step-Down Regulator with Power-OK
6 _______________________________________________________________________________________
Typical Operating Characteristics
(Typical values are at V
IN
= V
CC
= V
CTL
= 5V, V
OUT
= 1.2V, I
OUT
= 3A, and T
A
= +25°C, unless otherwise noted.)
EFFICIENCY vs. OUTPUT CURRENT
(V
IN
= V
CC
= 5V, f
SW
= 1MHz)
MAX8505 toc01
OUTPUT CURRENT (A)
EFFICIENCY (%)
321
60
70
80
90
100
50
04
A: V
OUT
= 3.3V
B: V
OUT
= 2.5V
C: V
OUT
= 1.2V
D: V
OUT
= 0.8V
A
B
C
D
EFFICIENCY vs. OUTPUT CURRENT
(V
IN
= V
CC
= 3.3V, f
SW
= 500kHz)
MAX8505 toc02
OUTPUT CURRENT (A)
EFFICIENCY (%)
321
60
70
80
90
100
50
04
A: V
OUT
= 2.5V
B: V
OUT
= 1.8V
C: V
OUT
= 1.2V
D: V
OUT
= 0.8V
A
B
C
D
EFFICIENCY vs. OUTPUT CURRENT
(V
IN
= V
CC
= 3.3V, f
SW
= 1MHz)
MAX8505 toc03
OUTPUT CURRENT (A)
EFFICIENCY (%)
321
60
70
80
90
100
50
04
A: V
OUT
= 2.5V
B: V
OUT
= 1.8V
C: V
OUT
= 1.2V
D: V
OUT
= 0.8V
A
B
C
D
EFFICIENCY vs. OUTPUT CURRENT
(V
IN
= 2.5V, V
CC
= 5V, f
SW
= 1MHz)
MAX8505 toc04
OUTPUT CURRENT (A)
EFFICIENCY (%)
321
60
70
80
90
100
50
04
A: V
OUT
= 1.8V
B: V
OUT
= 1.2V
C: V
OUT
= 0.8V
A
B
C
FREQUENCY vs. INPUT VOLTAGE AND
TEMPERATURE
MAX8505 toc05
INPUT VOLTAGE (V)
FREQUENCY (MHz)
5.04.54.03.53.0
0.97
0.99
1.01
1.03
1.05
0.95
2.5 5.5
+85°C
+25°C
-40°C
FREQUENCY vs. INPUT VOLTAGE AND
TEMPERATURE
MAX8505 toc06
INPUT VOLTAGE (V)
FREQUENCY (kHz)
5.04.54.03.53.0
480
490
500
510
520
530
470
2.5 5.5
+85°C
+25°C
-40°C
OUTPUT LOAD REGULATION
MAX8505 toc07
OUTPUT CURRENT (A)
-∆V
OUT
(mV)
321
1
2
3
4
5
6
0
04
A: V
OUT
= 0.8V
B: V
OUT
= 1.2V
C: V
OUT
= 1.8V
D: V
OUT
= 2.5V
A
B
C
D
V
IN
= V
CC
= 3.3V