High-Efficiency, PWM, Step-Down
DC-DC Controllers in 16-Pin QSOP
____________________________________Typical Operating Characteristics (continued)
(Circuit of Figure 1,
SKIP
= GND, T
A
= +25°C, unless otherwise noted.)
EFFICIENCY vs.
LOAD CURRENT (3.3V/5A CIRCUIT)
MAX1652 toc04
MAX1652–MAX1655
EFFICIENCY vs.
LOAD CURRENT (5V/3A CIRCUIT)
MAX1652 toc04a
EFFICIENCY vs.
LOAD CURRENT (1.8V/2.5A CIRCUIT)
MAX1655
f = 300kHz
90
EFFICIENCY (%)
V+ = 6V
MAX1652 toc05
100
V+ = 6V
90
EFFICIENCY (%)
100
V+ = 6V
100
90
EFFICIENCY (%)
80
V+ = 28V
70
80
V+ = 12V
70
V+ = 28V
80
70
V+ = 24V
60
V+ = 12V
60
MAX1653
f = 300kHz
0.1
1
10
50
0.001
0.01
0.1
LOAD CURRENT (A)
MAX1653
f = 300kHz
1
10
60
V+ = 12V
50
0.001
50
0.001
0.01
0.01
0.1
LOAD CURRENT (A)
1
10
LOAD CURRENT (A)
IDLE-MODE SUPPLY CURRENT vs.
INPUT VOLTAGE (3.3V/3A CIRCUIT)
MAX1652 toc06
PWM-MODE SUPPLY CURRENT vs.
INPUT VOLTAGE (3.3V/3A CIRCUIT)
MAX1652 toc07
SHUTDOWN SUPPLY CURRENT
vs. INPUT VOLTAGE
SHDN = 0V
8
SUPPLY CURRENT (µA)
MAX1652 toc08
10
MAX1653
SKIP = 0
NO LOAD
SUPPLY CURRENT (mA)
1
30
25
SUPPLY CURRENT (mA)
20
15
10
5
MAX1653
SKIP = VL
f = 300kHz
NO LOAD
10
6
4
0.1
2
0.01
0
5
10
15
20
25
30
INPUT VOLTAGE (V)
0
0
5
10
15
20
25
30
INPUT VOLTAGE (V)
0
0
5
10
15
20
25
30
INPUT VOLTAGE (V)
REF LOAD-REGULATION ERROR
vs. REF LOAD CURRENT
MAX1652 toc010
VL LOAD-REGULATION ERROR
vs. VL LOAD CURRENT
MAX1652 toc011
MAX1652 MAXIMUM SECONDARY OUTPUT
CURRENT vs. SUPPLY VOLTAGE
MAXIMUM SECONDARY CURRENT (mA)
V
SEC
> 12.75V,
+5V OUTPUT > 4.75V,
CIRCUIT OF FIGURE 9
+5V LOAD = 0A
MAX1652 toc12
30
25
20
15
10
5
0
0
50
100 150
200 250 300 350
50
45
LOAD REGULATION
∆V
(mV)
40
35
30
25
20
15
10
5
0
1500
LOAD REGULATION
∆V
(mV)
1200
900
600
+5V LOAD = 3A
300
0
0
10
20
30
40
50
60
70
80
0
5
10
15
20
25
30
LOAD CURRENT (mA)
SUPPLY VOLTAGE (V)
400
LOAD CURRENT (µA)
_______________________________________________________________________________________
7
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
