Datasheet

MAX1652–MAX1655
High-Efficiency, PWM, Step-Down
DC-DC Controllers in 16-Pin QSOP
_______________________________________________________________________________________ 7
100
50
0.001 0.1 10.01 10
EFFICIENCY vs.
LOAD CURRENT (5V/3A CIRCUIT)
60
MAX1652 toc04a
LOAD CURRENT (A)
EFFICIENCY (%)
70
80
90
V+ = 28V
V+ = 6V
V+ = 12V
MAX1653
f = 300kHz
____________________________________Typical Operating Characteristics (continued)
(Circuit of Figure 1, SKIP = GND, T
A
= +25°C, unless otherwise noted.)
100
50
0.001 0.1 10.01 10
EFFICIENCY vs.
LOAD CURRENT (3.3V/5A CIRCUIT)
60
MAX1652 toc04
LOAD CURRENT (A)
EFFICIENCY (%)
70
80
90
V+ = 6V
V+ = 28V
V+ = 12V
MAX1653
f = 300kHz
0
10
5
20
15
25
30
0 10 155 20 25 30
PWM-MODE SUPPLY CURRENT vs.
INPUT VOLTAGE (3.3V/3A CIRCUIT)
MAX1652 toc07
INPUT VOLTAGE (V)
SUPPLY CURRENT (mA)
MAX1653
SKIP = VL
f = 300kHz
NO LOAD
100
50
0.001 0.1 10.01 10
EFFICIENCY vs.
LOAD CURRENT (1.8V/2.5A CIRCUIT)
60
MAX1652 toc05
LOAD CURRENT (A)
EFFICIENCY (%)
70
80
90
V+ = 6V
V+ = 24V
V+ = 12V
MAX1655
f = 300kHz
0.01
0 302010 25155
IDLE-MODE SUPPLY CURRENT vs.
INPUT VOLTAGE (3.3V/3A CIRCUIT)
0.1
1
10
MAX1652 toc06
INPUT VOLTAGE (V)
SUPPLY CURRENT (mA)
MAX1653
SKIP = 0
NO LOAD
0
4
2
6
8
10
0 10 155 20 25 30
SHUTDOWN SUPPLY CURRENT
vs. INPUT VOLTAGE
MAX1652 toc08
INPUT VOLTAGE (V)
SUPPLY CURRENT (µA)
SHDN = 0V
0
10
5
20
15
25
30
0 100 15050 200 250 300 350 400
REF LOAD-REGULATION ERROR
vs. REF LOAD CURRENT
MAX1652 toc010
LOAD CURRENT (µA)
LOAD REGULATION ∆V (mV)
0
300
900
600
1200
1500
0 10 155 20 25 30
MAX1652 MAXIMUM SECONDARY OUTPUT
CURRENT vs. SUPPLY VOLTAGE
MAX1652 toc12
SUPPLY VOLTAGE (V)
MAXIMUM SECONDARY CURRENT (mA)
V
SEC
> 12.75V,
+5V OUTPUT > 4.75V,
CIRCUIT OF FIGURE 9
+5V LOAD = 0A
+5V LOAD = 3A
0
10
5
20
15
25
50
45
40
35
30
0 20 3010 40 50 60 70 80
VL LOAD-REGULATION ERROR
vs. VL LOAD CURRENT
MAX1652 toc011
LOAD CURRENT (mA)
LOAD REGULATION ∆V (mV)