NCP1509 Datasheet, PDF (6/15 Pages) ON Semiconductor – Up to 500 mA, 1 MHz, High Efficiency Synchronous Step−Down DC−DC Converter in DFN Package

NCP1509
100
90
80
70
60
50
40
30
20
10
0
0
1.8 V_out
1.57 V_out
1.35 V_out
1.05 V_out
V_in = 3.6 V PWM
T_A = 25°C
100
200
300
400
500
I_out (mA)
Figure 4. Efficiency vs. Output Current in
PWM Mode
100
95
1.57 V_out
1.8 V_out
90
85
80
1.05 V_out
1.35 V_out
75 _{Iout = 100 mA PWM}
T_A = 25°C
70
2.7
3.2
3.7
4.2
4.7
5.2
V_in (V)
Figure 5. Efficiency vs. Input Voltage in
PWM Mode
100
2.7 V_in
90
80
70
3.6 V_in 5.2 V_in
60
50
40
30
20
10
V_out = 1.8 V PWM
T_A = 25°C
0
0
100
200
300
400
500
I_out (mA)
Figure 6. Efficiency vs. Output Current at
Different Input Voltage
94
92
1.8 V_out
90
88
1.57 V_out
1.35 V_out
86
84
1.05 V_out
82
V_in = 3.6 V
I_out = 300 mA PWM
80 ^{TA = 25°C}
500
700
900
1100
FREQUENCY (kHz)
1300
Figure 8. Efficiency vs. Frequency
1500
94
92
90
88
86
84
82
80
500
1.05 V_out
1.35 V_out
1.8 V_out
1.57 V_out
V_in = 3.6 V
I_out = 150 mA PWM
T_A = 25°C
700
900
1100
1300 1500
FREQUENCY (kHz)
Figure 7. Efficiency vs. Frequency
100
90
80
70
1.57 V_out
60
50 _{1.8 Vout}
40
30
1.35 V_out
1.05 V_out
20
10
0
0.001
0.01
0.1
1
I_out (mA)
V_in = 3.6 V PM
T_A = 25°C
10
100
Figure 9. Efficiency vs. Output Current in
Pulsed Mode
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