MAX887 데이터 시트보기 (PDF) - Maxim Integrated
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MAX887 Datasheet PDF : 12 Pages
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100% Duty Cycle, Low-Noise,
Step-Down, PWM DC-DC Converter
____________________________Typical Operating Characteristics (continued)
(Circuit of Figure 2, TA = +25°C, unless otherwise noted.)
EFFICIENCY vs. OUTPUT CURRENT
100
90
VIN = 4V
80 VIN = 5V
70
60
VIN = 11V
50
40
VIN = 9V
30
20
VIN = 7V
10
0
0.0001 0.001
IDLE MODE
(SYNC = GND)
VOUT = 3.3V
0.01
0.1
0.6
OUTPUT CURRENT (A)
EFFICIENCY vs. OUTPUT CURRENT
100
VIN = 5.5V
90
80
VIN = 11V
70
60
50
VIN = 9V
40
30
VIN = 7V
20
10
0
0.0001 0.001
IDLE MODE
(SYNC = GND)
VOUT = 5V
0.01
0.1
0.6
OUTPUT CURRENT (A)
MAXIMUM OUTPUT CURRENT
vs. SUPPLY VOLTAGE
1200
3.3V SETTING, VOUT = 3.135V
1000
800
5V SETTING, VOUT = 4.75V
600
400
200 GUARANTEED OUTPUT CURRENT
OF FIGURE 2 IS 600mA
0
3 5 7 9 11 13 15 17
SUPPLY VOLTAGE (V)
MAXIMUM OUTPUT CURRENT
vs. SYNC FREQUENCY
1200
1000
800
600
400
200
0
0
C2, C3 = 47µF
L1 = 33µH
VIN = 5V
VOUT = 3.3V
VOUT = -5% at IOUT(MAX)
100 200 300 400 500 600
SYNC FREQUENCY (kHz)
SWITCHING FREQUENCY
vs. SUPPLY VOLTAGE
350
340
VOUT = 3.3V
330
320
310
300
290
280
270
260
250
0 2 4 6 8 10 12 14 16 18
SUPPLY VOLTAGE (V)
QUIESCENT SUPPLY CURRENT
vs. SUPPLY VOLTAGE
3.5
A
3.0
A
2.5
2.0
A: VOUT = 3.3V, PWM MODE
1.5
B: VOUT = 3.3V, PFM MODE
1.0
C
0.5
B
0
0 2 4 6 8 10 12 14 16 18
SUPPLY VOLTAGE (V)
SWITCHING FREQUENCY
vs. TEMPERATURE
350
340
VOUT = 3.3V
330
320
310
300
290
280
270
260
250
-60 -40 -20 0 20 40 60 80 100 120 140
TEMPERATURE (°C)
QUIESCENT CURRENT
vs.TEMPERATURE
3.0
VIN = 5.3V
VOUT = 3.3V
2.5
PWM MODE
2.0
1.5
1.0
0.5
PFM MODE
0
-60 -40 -20 0 20 40 60 80 100 120 140
TEMPERATURE (°C)
OUTPUT RIPPLE AND HARMONICS
4
VIN = 5V
VOUT = 3.3V
3
IOUT = 500mA
PWM MODE
2
1
0
-1
10k
100k
1M
10M
FREQUENCY (Hz)
4 _______________________________________________________________________________________
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