MAX796 查看數據表（PDF） - Maxim Integrated
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MAX796 Datasheet PDF : 32 Pages
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Step-Down Controllers with
Synchronous Rectifier for CPU Power
____________________________Typical Operating Characteristics (continued)
(TA = +25°C, unless otherwise noted.)
QUIESCENT SUPPLY CURRENT
vs. SUPPLY VOLTAGE,
5V/3A CIRCUIT IN IDLE MODE
16m
15m
14m
STANDARD MAX797 APPLICATION
CONFIGURED FOR 5V
SKIP = LOW
800μ
SYNC = REF
600μ
400μ
200μ
0
0 4 8 12 16 20 24 28 32
SUPPLY VOLTAGE (V)
SHUTDOWN SUPPLY CURRENT
vs. SUPPLY VOLTAGE
1.6
1.4
1.2
1.0
0.8
DEVICE CURRENT ONLY
0.6
SHDN = LOW
0.4
0.2
0
0 4 8 12 16 20 24 28 32
SUPPLY VOLTAGE (V)
VL LOAD-REGULATION ERROR
vs. LOAD CURRENT
500
400
300
200
100
0
0
20
40
60
80
VL LOAD CURRENT (mA)
QUIESCENT SUPPLY CURRENT
vs. SUPPLY VOLTAGE,
3.3V/3A CIRCUIT IN IDLE MODE
1400
1200
1000
SWITCHING
800
600
NOT SWITCHING
(FB FORCED TO 3.5V)
400
STANDARD MAX797 3.3V/3A
200
CIRCUIT, FIGURE 1
SKIP = LOW
SYNC = REF
0
0 4 8 12 16 20 24 28 32
SUPPLY VOLTAGE (V)
DROPOUT VOLTAGE
vs. LOAD CURRENT
800
700
600
f = 300kHz
500
400
300
200
100
0
0.01
f = 150kHz
STANDARD MAX797 APPLICATION
CONFIGURED FOR 5V
VOUT > 4.8V
0.1
1
10
LOAD CURRENT (A)
SWITCHING FREQUENCY
vs. LOAD CURRENT
1000
SYNC = REF (300kHz)
SKIP = LOW
100
+5V, VIN = 7.5V
10 +5V, VIN = 30V
1
+3.3V, VIN = 7.5V
0.1
100μ
1m
10m
100m
1
LOAD CURRENT (A)
QUIESCENT SUPPLY CURRENT
vs. SUPPLY VOLTAGE, LOW-NOISE MODE
30
20
f = 300kHz
f = 150kHz
10
STANDARD MAX797 3.3V/3A
CIRCUIT, FIGURE 1
SKIP = HIGH
0
0 4 8 12 16 20 24 28 32
SUPPLY VOLTAGE (V)
REF LOAD-REGULATION ERROR
vs. LOAD CURRENT
20
15
10
5
0
1
10
100
1000
REF LOAD CURRENT (μA)
MAX796
MAXIMUM SECONDARY CURRENT
vs. SUPPLY VOLTAGE, 5V/15V CIRCUIT
450
IOUT (MAIN) = 0A
400
350
300
IOUT (MAIN) = 3A
250
200
150
100
CIRCUIT OF FIGURE 11
TRANSFORMER = TTI5870
50
VSEC > 12.75V
0
0 4 8 12 16 20 24 28 32
SUPPLY VOLTAGE (V)
_______________________________________________________________________________________ 7
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