MAX746 Maxim, MAX746 Datasheet - Page 4

• Manufacturer Part Number: MAX746
• Description: High-Efficiency / PWM / Step-Down / N-Channel DC-DC Controller
• Manufacturer: Maxim

High-Efficiency, PWM, Step-Down,
N-Channel DC-DC Controller
4
(Circuit of Figure 1a, T
__________________________________________Typical Operating Characteristics
_______________________________________________________________________________________
100
90
80
70
1.2
1.1
1.0
0.9
0.8
4
3
2
1
0
0.01
0.01
5
V IN = 9V
CIRCUIT OF FIGURE 1a
V
EFFICIENCY vs. OUTPUT CURRENT
OUT
PEAK INDUCTOR CURRENT
N0-LOAD SUPPLY CURRENT
= 5V
7
vs. OUTPUT CURRENT
vs. SUPPLY VOLTAGE
OUTPUT CURRENT (A)
OUTPUT CURRENT (A)
SUPPLY VOLTAGE (V)
0.1
0.1
V IN = 12V
V IN = 12V
9
V IN = 6V
A
CIRCUIT OF FIGURE 1a
V
OUT
= +25°C, unless otherwise noted.)
V IN = 9V
= 5V
V IN = 6V
11
1
1
13
10
10
15
100
90
80
70
4
3
2
1
0
4
3
2
1
0
0.01
0.01
-75
CIRCUIT OF FIGURE 1b
V OUT = 3.3V
V+ = 5V
EFFICIENCY vs. OUTPUT CURRENT
V OUT = 3.3V
V+ = 5V
CIRCUIT OF FIGURE 1b
V+ = 9V
V
-50 -25
OUT
NO-LOAD SUPPLY CURRENT
PEAK INDUCTOR CURRENT
= 5V
vs. OUTPUT CURRENT
OUTPUT CURRENT (A)
OUTPUT CURRENT (A)
vs. TEMPERATURE
TEMPERATURE (°C)
0.1
0.1
0
ENTIRE
CIRCUIT
SCHOTTKY DIODE
LEAKAGE EXCLUDED
25
50
1
1
75
100 125
10
10
100
1.5
1.0
0.5
90
80
70
15
13
11
0
9
7
5
0.01
0.01
0.7
CIRCUIT OF FIGURE 1c
V OUT = 5V
CONDUCTION REGION
INDUCTOR
EFFICIENCY vs. OUTPUT CURRENT
CIRCUIT OF FIGURE 1c
V OUT = 5V
BOUNDARY AND CORRESPONDING
CONTINUOUS-CONDUCTION MODE
CURRENT
DISCONTINUOUS-
PEAK INDUCTOR CURRENT
PEAK INDUCTOR CURRENT
0.9
PEAK
vs. OUTPUT CURRENT
OUTPUT CURRENT (A)
OUTPUT CURRENT (A)
OUTPUT CURRENT (A)
0.1
0.1
V IN = 12V
V IN = 6V
1.1
V IN = 12V
V IN = 6V
CONTINUOUS-
CONDUCTION
1.3
REGION
1
1
1.5
10
1.7
10