Step-Down Controllers with
Synchronous Rectifier for CPU Power
MAX796/MAX797/MAX799
____________________________Typical Operating Characteristics (continued)
(T
A
= +25°C, unless otherwise noted.)
MAX796
MAXIMUM SECONDARY CURRENT
vs. SUPPLY VOLTAGE, 3.3V/5V CIRCUIT
MAX796-12
MAX799
MAXIMUM SECONDARY CURRENT
vs. SUPPLY VOLTAGE, ±5V CIRCUIT
MAXIMUM SECONDARY CURRENT (mA)
700
600
500
400
I
OUT
(MAIN) = 1A
300
200
100
0
0
4
8
12
CIRCUIT OF FIGURE 13
TRANSFORMER = TTI5926
V
SEC
≤
-5.1V
I
OUT
(MAIN) = 0A
MAX796-13
1050
MAXIMUM SECONDARY CURRENT (mA)
I
OUT
(MAIN) = 2A
900
750
I
OUT
(MAIN) = 0A
600
450
300
150
0
0
3
6
9
12
15
18
21
CIRCUIT OF FIGURE 12
TRANSFORMER = TDK 1.5:1
V
SEC
≥
4.8V
800
24
16
20
24
28
32
SUPPLY VOLTAGE (V)
SUPPLY VOLTAGE (V)
PULSE-WIDTH-MODULATION MODE WAVEFORMS
IDLE-MODE WAVEFORMS
LX VOLTAGE
10V/div
+5V OUTPUT
50mV/div
+5V OUTPUT
VOLTAGE
50mV/div
2V/div
500ns/div
I
LOAD
= 1A, V
IN
= 16V,
CIRCUIT OF FIGURE 1
200μs/div
I
LOAD
= 100mA, V
IN
= 10V,
CIRCUIT OF FIGURE 1
+5V LOAD-TRANSIENT RESPONSE
3A
0A
LOAD CURRENT
+5V OUTPUT
50mV/div
200μs/div
V
IN
= 15V, CIRCUIT OF FIGURE 1
8
_______________________________________________________________________________________
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
