MAX1605 Maxim, MAX1605 Datasheet - Page 5

• Manufacturer Part Number: MAX1605
• Description: 30V Internal Switch LCD Bias Supply
• Manufacturer: Maxim

(V
18.1V
17.9V
CC
600
500
400
300
200
100
6V
4V
2V
18
90
88
86
84
82
80
78
76
74
= 3.3V, V
0
0
A: V
B: V
CURRENT LIMIT vs. INPUT VOLTAGE
IN
OUT
EFFICIENCY vs. LOAD CURRENT
= V
= 18V, R
5
CC
3
IN
= 2.4V TO 5.5V
LIM = OPEN
LINE TRANSIENT
LOAD CURRENT (mA)
INPUT VOLTAGE (V)
(250mA)
LIM = OPEN
= 3.6V, L1 = 10µH, SHDN = LIM = V
LIM = V
OUT
(L1 = 47µH)
10
200µs/div
= 3.6kΩ
_______________________________________________________________________________________
6
CC
LIM = GND
LIM = GND
(125mA)
15
LIM = V
(500mA)
30V Internal Switch LCD Bias Supply
9
20
MAX1605 toc13
CC
12
25
500mA
10mA
18.1V
17.9V
18V
25
20
15
10
90
88
86
84
82
80
78
76
74
Typical Operating Characteristics (continued)
5
0
0
0
0
0
V
V
OUT
CC
CC
vs. SUPPLY VOLTAGE (NO-LOAD)
= 3.3V, V
EFFICIENCY vs. LOAD CURRENT
= 18V, I
, V
1
5
OUT(NOM)
LIM = GND
(125mA)
SUPPLY CURRENT
OUT
SUPPLY VOLTAGE (V)
IN
LOAD TRANSIENT
LOAD CURRENT (mA)
= 3.6V
2
(L1 = 100µH)
= 1mA TO 10mA
10
40µs/div
3
= 18V (Figure 3), T
LIM = OPEN
15
(250mA)
LIM = V
4
(500mA)
20
MAX1605 toc14
CC
5
25
A
500mA
250mA
= +25°C, unless otherwise noted.)
600
500
400
300
200
100
20V
10V
3.0
2.5
2.0
1.5
1.0
0.5
4V
2V
0
0
0
0
2.0
0
V
V
CURRENT LIMIT vs. SUPPLY VOLTAGE
SUPPLY CURRENT vs. LOAD CURRENT
OUT
CC
= 3.3V, V
2.5
= 18V, R
LIM = GND
5
SHUTDOWN WAVEFORM
(125mA)
3.0
IN
SUPPLY VOLTAGE (V)
OUT
LOAD CURRENT (mA)
= 3.6V
= 1.8kΩ
10
3.5
LIM = OPEN
200µs/div
(250mA)
LIM = GND
LIM = OPEN
4.0
LIM = V
15
4.5
LIM = V
CC
(500mA)
20
MAX1605 toc15
5.0
CC
5.5
25
5