MAX799 MAXIM [Maxim Integrated Products], MAX799 Datasheet - Page 7

• Manufacturer Part Number: MAX799
• Description: Step-Down Controllers with Synchronous Rectifier for CPU Power
• Manufacturer: MAXIM [Maxim Integrated Products]

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