Rainbow Electronics MAX726 - Manual (Page 4)

MAX724/MAX726
5A/2A Step-Down, PWM,
Switch-Mode DC-DC Regulators
4 _______________________________________________________________________________________
2.25
2.19
-40 100
REFERENCE VOLTAGE
vs. JUNCTION TEMPERATURE
2.20
2.24
JUNCTION TEMPERATURE (°C)
REFERENCE VOLTAGE (V)
50
2.22
2.21
-25 25 75
2.23
0
2.18
2.17
125
3.0
0 6
SWITCH-ON VOLTAGE
vs. SWITCH CURRENT
0.5
2.5
SWITCH CURRENT (A)
SWITCH-ON VOLTAGE (V)
4
1.5
1.0
1 3 5
2.0
2
T j = +25°C
MAX724
MAX726
120
90
-40 100
SWITCHING FREQUENCY
vs. JUNCTION TEMPERATURE
95
115
JUNCTION TEMPERATURE (°C)
SWITCHING FREQUENCY (kHz)
50
105
100
-25 25 75
110
0
85
80
125
8000
1k
ERROR-AMPLIFIER PHASE AND g M
3000
7000
FREQUENCY (Hz)
TRANSCONDUCTANCE (
µ mho)
10M
5000
4000
10k 1M
6000
100k
0
2000
1000
200
-50
150
PHASE (degrees)
50
0
100
-200
-100
-150
PHASE
g M
160
0
SWITCHING FREQUENCY
vs. FEEDBACK PIN VOLTAGE
60
140
FB VOLTAGE (V)
SWITCHING FREQUENCY (kHz)
2.0
100
80
0.5 1.5
120
1.0
0
40
20
2.5 3.0
+125°C
+25°C
-40°C
500
0
FEEDBACK PIN CURRENT
vs. FB VOLTAGE
0
400
FB VOLTAGE (V)
FB CURRENT (
µ A)
4
200
100
1 3
300
2
-300
-100
-200
5 6
-400
-500
7 8 9 10
START OF FREQUENCY
SHIFTING
8
-40
OUTPUT CURRENT LIMIT
vs. TEMPERATURE
3
7
JUNCTION TEMPERATURE (°C)
OUTPUT CURRENT LIMIT (A)
50
5
4
-25 25
6
0
2
75
1
0
100 125
MAX724
MAX726
____________________________Typical Operating Characteristics (continued)