MAX747CPD 데이터 시트보기 (PDF) - Maxim Integrated
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MAX747CPD Datasheet PDF : 12 Pages
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High-Efficiency PWM, Step-Down
P-Channel DC-DC Controller
__________________________________________Typical Operating Characteristics
(Circuit of Figure 1, V+ = 9V, TA = +25°C, unless otherwise noted.)
SUPPLY CURRENT vs.
TEMPERATURE
4
VIN = 9V
VOUT = 5V
3
2
ENTIRE
CIRCUIT
1
SCHOTTKY DIODE
LEAKAGE EXCLUDED
0
-75 -50 -25 0 25 50 75 100 125
TEMPERATURE (°C)
PEAK INDUCTOR CURRENT vs.
OUTPUT CURRENT (VOUT = 3.3V)
3
2
VIN = 9V
1 VIN = 6V
SUPPLY CURRENT vs.
SUPPLY VOLTAGE
1.0
0.9
0.8
0.7
0.6
5
7
9
11
13
15
SUPPLY VOLTAGE (V)
EFFICIENCY vs. OUTPUT CURRENT
(VOUT = 5V)
100
VIN = 6V
90
VIN = 9V
VIN = 12V
80
PEAK INDUCTOR CURRENT vs.
OUTPUT CURRENT (VOUT = 5V)
3
2
1 VIN = 12V
VIN = 9V
VIN = 6V
0
0.01
0.1
1
10
OUTPUT CURRENT (A)
EFFICIENCY vs. OUTPUT CURRENT
(VOUT = 3.3V)
100
VIN = 6V
90
VIN = 9V
VIN = 12V
80
VIN = 5V
0
70
70
0.01
0.1
1
10
0.01
0.1
1
10
0.01
0.1
1
10
OUTPUT CURRENT (A)
OUTPUT CURRENT (A)
OUTPUT CURRENT (A)
CONTINUOUS-CONDUCTION MODE BOUNDARY
AND CORRESPONDING PEAK INDUCTOR CURRENT (VOUT = 3.3V)
18
2.0
VOUT = 3.3V
L = 33µH
RSENSE = 50mΩ
14
1.6
DISCONTINUOUS
CONDUCTION
REGION
10
1.2
PEAK
INDUCTOR
CURRENT
6
CONTINUOUS 0.8
CONDUCTION
REGION
CONTINUOUS-CONDUCTION MODE BOUNDARY
AND CORRESPONDING PEAK INDUCTOR CURRENT (VOUT = 5V)
15
2.0
DISCONTINUOUS
CONDUCTION
13
REGION
PEAK INDUCTOR
1.6
CURRENT
VOUT = 5V
11 L = 50µH
RSENSE = 50mΩ
1.2
9
CONTINUOUS
0.8
7
CONDUCTION
REGION
2
0.4
0.4 0.6 0.8 1.0 1.2 1.4
OUTPUT CURRENT (A)
5
0.4
0.5
0.7
0.9
1.1
1.3
OUTPUT CURRENT (A)
_______________________________________________________________________________________ 3
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