MAX685 Maxim, MAX685 Datasheet - Page 4

• Manufacturer Part Number: MAX685
• Description: Dual-Output Positive and Negative / DC-DC Converter for CCD and LCD
• Manufacturer: Maxim

Dual-Output (Positive and Negative),
DC-DC Converter for CCD and LCD
4
(Circuit of Figure 3, V
_______________________________________________________________________________________
90
80
70
60
0
EFFICIENCY vs. LOAD CURRENT
(POSITIVE OUTPUT LOADED)
2
250
240
230
220
210
200
190
180
170
160
150
2.0
1.5
1.0
0.5
LOAD CURRENT (mA)
0
2.5
2.7
4
OUT+
V
3.0
3.2
IN
LX SWITCHING FREQUENCY
= 5.0V
NO-LOAD CURRENT vs.
= 15V, V
6
vs. INPUT VOLTAGE
V
INPUT VOLTAGE
IN
3.5
INPUT VOLTAGE (V)
3.7
INPUT VOLTAGE (V)
= 3.3V
8
4.0
4.2
OUT-
10
= -7.5V, T
4.5
4.7
SYNC = V
5.0
5.2
DD
85
80
75
70
65
60
55
50
A
5.5
5.7
= +25°C, unless otherwise noted.)
0
1
EFFICIENCY vs. LOAD CURRENT
(NEGATIVE OUTPUT LOADED)
2
LOAD CURRENT (mA)
3
4
V
5
IN
Typical Operating Characteristics
= 5.0V
6
V
IN
7
= 3.3V
8
1.250
1.248
1.254
1.252
1.250
1.248
1.246
1.244
1.242
1.240
1.249
9
10
-40
0
5
REFERENCE LOAD REGULATION
V
-20
IN
10
= 3.3V
REFERENCE VOLTAGE
90
85
55
50
80
75
70
65
60
vs. TEMPERATURE
15 20
0
LOAD CURRENT (µA)
TEMPERATURE (°C)
0
20
EFFICIENCY vs. LOAD CURRENT
25 30 35 40 45 50
V
(BOTH OUTPUTS LOADED)
IN
2
40
= 5.0V
LOAD CURRENT (mA)
60
4
V
80
IN
= 5.0V
V
6
100
IN
= 3.3V
8
10