MAX1774(2002) Просмотр технического описания (PDF) - Maxim Integrated
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MAX1774
(Rev.:2002)
(Rev.:2002)
Maxim Integrated
MAX1774 Datasheet PDF : 21 Pages
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Dual, High-Efficiency, Step-Down
Converter with Backup Battery Switchover
Typical Operating Characteristics
(Circuit of Figure 1, VIN = +5V, VINC = +3.3V, TA = +25°C, unless otherwise noted.)
100
90
80
70
60
50
40
30
20
10
0
1
MAIN EFFICIENCY vs. LOAD
VIN = +3.3V
VIN = +5V
VIN = +12V
VIN = +15V
VIN = +18V
VMAIN = 3.3V
10
100
1000
LOAD (mA)
10,000
CORE EFFICIENCY vs. LOAD
100
90
80
70
60
VIN = +2.7V
VIN = +3.3V
50
40
VIN = +5V
30
20
VCORE = 1.8V
10
0
1
10
100
1000
LOAD (mA)
BACKUP EFFICIENCY vs. LOAD
100
90
VBBATT = +2.5V
VBBATT = +1.0V
80
70
60
50
VBBATT = +0.8V
40
30
20
10
VMAIN = 3.3V
0
0.01
0.1
1
10
100
LOAD (mA)
VREF ACCURACY vs. TEMPERATURE
2.0
1.5
1.0
0.5
0
-0.5
-1.0
-1.5
-2.0
-40 -20
0 20 40 60
TEMPERATURE (°C)
80 100
0
-0.2
-0.4
-0.6
-0.8
-1.0
-1.2
-1.4
-1.6
-1.8
-2.0
0
REFERENCE LOAD REGULATION
10 20 30 40 50 60 70 80
IREF (µA)
MAIN SWITCHING WAVEFORMS
(LIGHT LOAD 100mA)
5V MAX1774-06
0
LX
5V/div
40mV
20mV VMAIN
(AC-COUPLED)
0
20mV/div
-20mV
500mA ILI
500mA/div
0
5µs/div
MAIN SWITCHING WAVEFORMS
(HEAVY LOAD 1A)
4V MAX1774-07
0
LX
5V/div
5µs/div
20mV
0
VMAIN
(AC-COUPLED)
20mV/div
-20mV
1500mA
1000mA IL1
500mA/div
500mA
0
8 _______________________________________________________________________________________
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