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| MAX1556_1 Datasheet, PDF (4/12 Pages) Maxim Integrated Products – 16μA IQ, 1.2A PWM Step-Down DC-DC Converters | |||
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16µA IQ, 1.2A PWM DC-DC
Step-Down Converters
Typical Operating Characteristics
(VIN = VINP = 3.6V, D1 = D2 = SHDN = IN, Circuits of Figures 2 and 3, TA = +25°C, unless otherwise noted.)
EFFICIENCY vs. LOAD CURRENT
WITH 3.3V OUTPUT
100
90
VIN = 4.2V VIN = 5V
80
VIN = 3.6V
70
60
50
40
0.1
1
10 100 1000 10,000
LOAD CURRENT (mA)
EFFICIENCY vs. LOAD CURRENT
WITH 1.0V OUTPUT (MAX1557)
100
90
80
VIN = 3.6V
VIN = 5V
70
VIN = 3V
60
VIN = 2.6V
50
40
0.1
1
10
100
1000
LOAD CURRENT (mA)
OUTPUT VOLTAGE vs. INPUT VOLTAGE
WITH NO LOAD
1.812
1.811
1.810
1.809
1.808
TA = -40°C
TA = +25°C
1.807
1.806
1.805
TA = +85°C
1.804
1.803
2.5 3.0 3.5 4.0 4.5 5.0 5.5
INPUT VOLTAGE (V)
EFFICIENCY vs. LOAD CURRENT
WITH 2.5V OUTPUT
100
90
VIN = 5V
80
VIN = 3.6V
VIN = 3V
70
VIN = 2.6V
60
50
40
0.1
1
10 100 1000 10,000
LOAD CURRENT (mA)
1.84
1.83
1.82
1.81
1.80
1.79
1.78
1.77
1.76
1.75
1.74
0
OUTPUT VOLTAGE
vs. LOAD CURRENT
TA = -45°C
TA = +25°C
TA = +85°C
200 400 600 800 1000 1200
LOAD CURRENT (mA)
EFFICIENCY vs. LOAD CURRENT
WITH 1.8V OUTPUT
100
90
80
VIN = 5V
VIN = 2.6V
VIN = 3.6V
70
VIN = 3V
60
50
40
0.1
1
10 100 1000 10,000
LOAD CURRENT (mA)
OUTPUT VOLTAGE vs. INPUT VOLTAGE
WITH 600mA LOAD
1.789
1.788
1.787
1.786
1.785
1.784
TA = -40°C
1.783
TA = +25°C
1.782
1.781
TA = +85°C
1.780
1.779
2.5 3.0 3.5 4.0 4.5 5.0 5.5
INPUT VOLTAGE (V)
SUPPLY CURRENT vs. INPUT VOLTAGE
20
18
16
14
12
10
8
6
4
2
0
1
2
3
4
5
6
INPUT VOLTAGE (V)
HEAVY-LOAD SWITCHING WAVEFORMS
MAX1556/7 toc09
ILOAD = 750mA
VOUT
AC-COUPLED
10mV/div
400ns
VLX
2V/div
0
ILX
500mA/div
0
4 _______________________________________________________________________________________
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