MAX686 Maxim, MAX686 Datasheet - Page 5

• Manufacturer Part Number: MAX686
• Description: DAC-Controlled Boost/Inverter LCD Bias Supply with Internal Switch
• Manufacturer: Maxim

(Circuits of Figures 1 and 2, V
__________________________________________Typical Operating Characteristics
1000
100
95
90
85
80
75
70
65
60
10
85
80
75
70
65
60
55
50
1
0.1
0.1
0
EFFICIENCY vs. LOAD CURRENT
EFFICIENCY vs. LOAD CURRENT
1
A
vs. INPUT VOLTAGE
LOAD CURRENT (mA)
LOAD CURRENT (mA)
INPUT CURRENT
INPUT VOLTAGE (V)
(V
1
2
1
(V
C
OUT
_______________________________________________________________________________________
OUT
E
F
V
INPUT CURRENT = I
V
CC
OUT
A: V
B: V
C: V
D: V
E: V
F: V
= +24V)
3
= -18V)
A: V
B: V
C: V
D: V
E: V
F: V
= V
= 18V, NO LOAD
IN
IN
IN
IN
IN
IN
IN
IN
IN
IN
IN
IN
IN
= 12V, ISET = V
= 12V, ISET = GND
= 3V, ISET = GND
= 3V, ISET = V
= 5V, ISET = V
= 5V, ISET = GND
= V
= 3V, ISET = GND
= 3V, ISET = V
= 9V, ISET = GND
= 9V, ISET = V
LCD Bias Supply with Internal Switch
= 5V, ISET = GND
= 5V, ISET = V
10
CC
10
4
DD
E
= V
CC
D
5
F
B
D
DD
CC
+ I
CC
CC
CC
CC
A
C
CC
B
DD
= V
100
100
6
IN
= +5V, L1 = 22µH, SHDN = V
1000
1.252
1.251
1.250
1.249
1.248
1.247
1.246
1.245
1.244
100
DAC-Controlled Boost/Inverter
10
95
90
85
80
75
70
65
60
1
0.1
0
0
INPUT VOLTAGE (V
MAXIMUM OUTPUT CURRENT vs.
V
C
EFFICIENCY vs. LOAD CURRENT
IN
REF
2
20
= V
= 0.1 F
CC
REFERENCE VOLTAGE
1
4
vs. LOAD CURRENT
= 5V
40
LOAD CURRENT (mA)
A
INPUT VOLTAGE (V)
LOAD CURRENT ( A)
(V
OUT
A: V
B: V
C: V
D: V
B
6
60
OUT
OUT
D
OUT
OUT
10
= +12V)
A: V
B: V
C: V
D: V
E: V
F: V
OUT
C
8
= 12V, ISET = V
= 12V, ISET = GND
= 24V, ISET = V
= 24V, ISET = GND
80
IN
IN
IN
IN
IN
IN
= +12V, +24V)
= 3V, ISET = GND
= 3V, ISET = V
= 9V, ISET = V
= 9V, ISET = GND
= 5V, ISET = V
= 5V, ISET = GND
CC
10
E
100
C
A
100
, C
F
D
B
12
REF
120
CC
CC
CC
CC
CC
1000
= 0.1µF, T A = +25°C, unless otherwise noted.)
14
140
AC-COUPLED
AC-COUPLED
50mV/div
50mV/div
85
80
75
70
65
60
100
10
1
V
V
0.1
OUT
OUT
0
INPUT VOLTAGE (V
A: V
B: V
MAXIMUM OUTPUT CURRENT vs.
EFFICIENCY vs. LOAD CURRENT
2
IN
IN
V
I
LOAD
OUT
= 9V, ISET = GND
= 9V, ISET = V
A
4
= 24V
= 5mA
C
OUTPUT VOLTAGE RIPPLE
LOAD CURRENT (mA)
INPUT VOLTAGE (V)
1
6
(V
B
A
OUT
A: V
B: V
C: V
D: V
8
CC
B
E
F
= -12V)
C: V
D: V
E: V
F: V
OUT
OUT
OUT
OUT
OUT
20 s/div
10
C
IN =
IN
IN
IN =
= -12V, ISET = V
= -18V, ISET = V
= -12V, ISET = GND
= -18V, ISET = GND
D
= 3V, ISET = V
= 5V, ISET = GND
= -12V, -18V)
3V, ISET = GND
10
12
5V, ISET = V
A & C
D
14
B & D
16
CC
CC
MAX686 TOC09
CC
CC
100
18
5
ISET = GND
ISET = V
CC