English
Language : 

MAX1605 Datasheet, PDF (4/12 Pages) Maxim Integrated Products – 30V Internal Switch LCD Bias Supply
◁
30V Internal Switch LCD Bias Supply
ELECTRICAL CHARACTERISTICS (continued)
(VCC = SHDN = 3.3V, TA = -40°C to +85°C, unless otherwise noted.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
LIM Input Low Level
2.4V ≤ VCC ≤ 5.5V
LIM Input Float Level
2.4V ≤ VCC ≤ 5.5V,
ILIM = ±0.5µA
LIM Input High Level
2.4V ≤ VCC ≤ 5.5V
LIM Input Bias Current
ILIM
SHDN = VCC, LIM = GND or VCC
SHDN = GND
MIN
(VCC / 2)
- 0.25V
VCC
- 0.4V
-2
MAX UNITS
0.4
V
(VCC / 2)
+ 0.25V
V
V
2
µA
1
Note 1: All devices are 100% tested at TA = +25°C. All limits over the temperature range are guaranteed by design.
Note 2: The MAX1605 requires a supply voltage between +2.4V and +5.5V; however, the input voltage used to power the inductor
can vary from +0.8V to VOUT.
Typical Operating Characteristics
(VCC = 3.3V, VIN = 3.6V, L1 = 10µH, SHDN = LIM = VCC, VOUT(NOM) = 18V (Figure 3), TA = +25°C, unless otherwise noted.)
OUTPUT VOLTAGE vs. SUPPLY VOLTAGE
18.2
VIN = 3.6V
18.1
LIM = VCC
(500mA)
18.0
IOUT = 5mA
17.9
17.8
IOUT = 1mA
17.7
17.6
2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
SUPPLY VOLTAGE (V)
EFFICIENCY vs. SUPPLY VOLTAGE
(L1 = 10µH)
80
78
IOUT = 5mA
IOUT = 10mA
76
74
IOUT = 1mA
72
VI8N0= 3.6V
ILIM = 500mA
70
2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
SUPPLY VOLTAGE (V)
OUTPUT VOLTAGE vs. INPUT VOLTAGE
21.5
21.3
21.1
IOUT = 5mA
20.9
20.7
20.5
20.3
IOUT = 1mA
20.1
19.9
19.7
19.5
0
VCC = 3.3V
LIM = VCC
(500mA)
3
6
9
12
INPUT VOLTAGE (V)
EFFICIENCY vs. INPUT VOLTAGE
(L1 = 10µH)
90
IOUT = 5mA
80
70
IOUT = 1mA
60
50
40
30
0
VCC = 3.3V
ILIM = 500mA
3
6
9
12
INPUT VOLTAGE (V)
OUTPUT VOLTAGE
vs. LOAD CURRENT
18.4
18.3
18.2
LIM = VCC
(500mA)
18.1
18.0
17.9
17.8
17.7
LIM = GND
(125mA)
17.6
LIM = OPEN
(250mA)
17.5
17.4
0
5
10
15
20
25
LOAD CURRENT (mA)
80
78
76
74
72
70
68
66
64
62
60
0
EFFICIENCY vs. LOAD CURRENT
(L1 = 10µH)
LIM = OPEN
(250mA)
LIM = VCC
(500mA)
LIM = GND
(125mA)
5
10
15
20
25
LOAD CURRENT (mA)
4 _______________________________________________________________________________________
 ▷