MAX1605 Datasheet, PDF (5/12 Pages) Maxim Integrated Products – 30V Internal Switch LCD Bias Supply

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