Datasheet

Transformer Driver for
Isolated RS-485 Interface
10.5
6.0
-60 -20 60 140
OUTPUT RESISTANCE vs. TEMPERATURE
(FS = LOW)
7.0
9.5
plot01
TEMPERATURE (°C)
OUTPUT RESISTANCE (Ω)
20 100
8.5
8.0
6.5
7.5
10.0
9.0
-40 0 8040 120
V
IN
= 4.5V
V
IN
= 5.0V
MEASURED AT TP1
15
6
-60
-20 60 140
OUTPUT RESISTANCE vs. TEMPERATURE
(FS = HIGH)
plot02
TEMPERATURE (°C)
OUTPUT RESISTANCE (Ω)
20 100
9
12
-40 0 8040 120
V
IN
= 4.5V
V
IN
= 5.0V
MEASURED AT TP1
1.0
0
-60 -20 60 140
SHUTDOWN SUPPLY CURRENT
vs. TEMPERATURE
plot03
TEMPERATURE (°C)
SHUTDOWN CURRENT (μA)
20 100
0.4
0.8
-40 0 8040 120
0.6
0.2
INCLUDES SWITCH LEAKAGE CURRENTS
260
160
-60 -20 60 140
D1, D2 FREQUENCY vs. TEMPERATURE
(FS = LOW)
plot04
TEMPERATURE (°C)
FREQUENCY (kHz)
20 100
200
240
-40 0 8040 120
220
180
V
IN
= 5.5V
V
IN
= 4.5V
V
IN
= 5.0V
V
IN
= 6.0V
850
400
-60
-20 60 140
SUPPLY CURRENT vs. TEMPERATURE
(FS = HIGH)
500
750
plot07
TEMPERATURE (°C)
SUPPLY CURRENT (μA)
20 100
650
600
450
550
800
700
-40 0 8040 120
V
IN
= 5.5V
V
IN
= 6.0V
V
IN
= 4.5V
V
IN
= 5.0V
480
280
-60 -20 60 140
D1, D2 FREQUENCY vs. TEMPERATURE
(FS = HIGH)
plot05
TEMPERATURE (°C)
FREQUENCY (kHz)
20 100
360
440
-40 0 8040 120
400
320
V
IN
= 4.5V
V
IN
= 5.0V
V
IN
= 6.0V
V
IN
= 5.5V
550
250
-60 -20 60 140
SUPPLY CURRENT vs. TEMPERATURE
(FS = LOW)
plot06
TEMPERATURE (°C)
SUPPLY CURRENT (μA)
20 100
350
-40 0 8040 120
300
400
500
450
600
V
IN
= 4.5V
V
IN
= 5.0V
V
IN
= 5.5V
V
IN
= 6.0V
100
0
0 40 120 200
EFFICIENCY vs. LOAD CURRENT
(FS = LOW)
20
80
plot08
LOAD CURRENT (mA)
EFFICIENCY (%)
80 160
60
40
10
30
90
70
50
20 60 140100 180
V
IN
= 5.5V
V
IN
= 4.5V
__________________________________________Typical Operating Characteristics
(Circuit of Figure 6, V
IN
= 5V ±10%, T
A
= +25°C, unless otherwise noted.)
MAX253
Maxim Integrated
3