Datasheet

MAX1776
24V, 600mA Internal Switch, 100% Duty Cycle,
Step-Down Converter
_______________________________________________________________________________________ 5
513117 9 15 17 19 21 23 25
V
OUTPUT
vs. V
IN
,
CIRCUIT 1, V
OUTPUT
= 5V
MAX1776 toc07
V
IN
(V)
V
OUTPUT
(%)
1.0
-0.6
-0.8
-0.2
-0.4
0.2
0
0.4
I
LOAD
= 1mA
I
LOAD
= 10mA
I
LOAD
= 50mA
I
LOAD
= 500mA
513117 9 15 17 19 21 23 25
V
OUTPUT
vs. V
IN
,
CIRCUIT 1, V
OUTPUT
= 3.3V
MAX1776 toc08
V
IN
(V)
V
OUTPUT
(%)
I
LOAD
= 1mA
I
LOAD
= 10mA
-1.2
-0.8
-1.0
-0.2
-0.4
-0.6
0
0.2
0.4
0.6
I
LOAD
= 500mA
I
LOAD
= 50mA
100
50
0.10 1 10 100 1000
EFFICIENCY vs. I
LOAD
, CIRCUIT 1,
V
OUT
= 5V
60
MAX1776 toc09
I
LOAD
(mA)
EFFICIENCY (%)
70
80
90
85
75
65
55
95
V
IN
= 15V
V
IN
= 12V
V
IN
= 24V
V
IN
= 6V
100
50
0.10 1 10 100 1000
EFFICIENCY vs. I
LOAD
, CIRCUIT 5,
V
OUTPUT
= 3.3V
60
MAX1776 toc10
I
LOAD
(mA)
EFFICIENCY (%)
70
80
90
85
75
65
55
95
V
IN
= 15V
V
IN
= 12V
V
IN
= 24V
V
IN
= 6V
100
50
0.10 1 10 100 1000
EFFICIENCY vs. I
LOAD
, CIRCUIT 1,
V
OUTPUT
= 3.3V
60
MAX1776 toc11
I
LOAD
(mA)
EFFICIENCY (%)
70
80
90
85
75
65
55
95
V
IN
= 12V
V
IN
= 24V
V
IN
= 6V
50
60
55
70
65
80
75
85
95
90
100
7 9 10 118 1213141516
EFFICIENCY vs. V
IN
, I
LOAD
= 500mA
MAX1776 toc12
V
IN
(V)
EFFICIENCY (%)
CIRCUIT 1, 5V
CIRCUIT 5, 5V
CIRCUIT 1, 3.3V
CIRCUIT 5, 3.3V
Typical Operating Characteristics (continued)
(Circuit of Figure 1, components from Table 3, V
IN
= +12V, SHDN = IN, T
A
= +25°C.)
0
40
20
80
60
120
100
140
180
160
200
0 200 300 400100 500 600 700 800 900
SWITCHING FREQUENCY vs.
LOAD CURRENT, CIRCUIT 1
MAX1776 toc13
I
LOAD
(mA)
FREQUENCY (kHz)
V
IN
= 24V
V
IN
= 12V
V
IN
= 15V
0
40
20
80
60
120
100
140
SWITCHING FREQUENCY vs.
V
IN
,
CIRCUIT 1
MAX1776 toc14
V
IN
(V)
FREQUENCY (kHz)
5 10152025
I
LOAD
= 250mA
I
LOAD
= 375mA
I
LOAD
= 500mA
I
LOAD
= 10mA
I
LOAD
= 50mA
I
LOAD
= 5mA
-1.5
-0.5
-1.0
0.5
0
1.0
1.5
-40 20 40-20 0 60 80 100
V
OUTPUT
ACCURACY vs. TEMPERATURE
MAX1776 toc15
TEMPERATURE (°C)
V
OUT
ACCURACY (%)