MAX747 Maxim, MAX747 Datasheet - Page 3

• Manufacturer Part Number: MAX747
• Description: High-Efficiency PWM / Step-Down P-Channel DC-DC Controller
• Manufacturer: Maxim

__________________________________________Typical Operating Characteristics
(Circuit of Figure 1, V+ = 9V, T
4
3
2
1
0
3
2
1
0
0.01
-75
V
V
V
OUTPUT CURRENT (V
-50 -25
IN
IN
IN
AND CORRESPONDING PEAK INDUCTOR CURRENT (V
PEAK INDUCTOR CURRENT vs.
= 6V
= 5V
= 9V
SUPPLY CURRENT vs.
OUTPUT CURRENT (A)
TEMPERATURE (°C)
TEMPERATURE
0.1
18
14
10
CONTINUOUS-CONDUCTION MODE BOUNDARY
6
2
0
0.4
_______________________________________________________________________________________
V
V
LEAKAGE EXCLUDED
25
IN
OUT
SCHOTTKY DIODE
= 9V
INDUCTOR
DISCONTINUOUS
CONDUCTION
REGION
CURRENT
= 5V
0.6
50
CIRCUIT
OUT
ENTIRE
1
PEAK
OUTPUT CURRENT (A)
A
75 100 125
= 3.3V)
= +25°C, unless otherwise noted.)
0.8
V
L = 33µH
R
OUT
SENSE
= 3.3V
10
1.0
= 50m
High-Efficiency PWM, Step-Down
CONTINUOUS
CONDUCTION
REGION
1.2
1.0
0.9
0.8
0.7
0.6
100
90
80
70
0.01
5
EFFICIENCY vs. OUTPUT CURRENT
1.4
OUT
P-Channel DC-DC Controller
2.0
1.6
1.2
0.8
0.4
7
SUPPLY CURRENT vs.
= 3.3V)
SUPPLY VOLTAGE (V)
OUTPUT CURRENT (A)
V
SUPPLY VOLTAGE
V
V
IN
IN
IN
0.1
= 12V
= 6V
= 9V
(V
9
OUT
= 5V)
11
AND CORRESPONDING PEAK INDUCTOR CURRENT (V
1
13
15
13
11
CONTINUOUS-CONDUCTION MODE BOUNDARY
9
7
5
0.5
15
10
DISCONTINUOUS
CONDUCTION
REGION
V
L = 50µH
R
OUT
SENSE
0.7
= 5V
OUTPUT CURRENT (A)
= 50m
100
90
80
70
3
2
1
0
0.01
0.01
PEAK INDUCTOR
0.9
V
V
EFFICIENCY vs. OUTPUT CURRENT
IN
IN
PEAK INDUCTOR CURRENT vs.
OUTPUT CURRENT (V
CURRENT
= 12V
= 9V
CONTINUOUS
CONDUCTION
REGION
OUTPUT CURRENT (A)
OUTPUT CURRENT (A)
1.1
V IN = 12V
0.1
0.1
V IN = 9V
V IN = 6V
(V
OUT
= 3.3V)
1.3
V
IN
OUT
2.0
1.6
1.2
0.8
0.4
= 6V
1
OUT
1
= 5V)
= 5V)
10
10
3