Typical operating characteristics (continued) – Rainbow Electronics MAX758A User Manual
Page 5
MAX1605
28V Internal Switch LCD Bias Supply
in SOT23
_______________________________________________________________________________________
5
74
76
78
80
82
84
86
88
90
0
5
10
15
20
25
EFFICIENCY vs. LOAD CURRENT
(L1 = 47
µH)
MAX1605 toc07
LOAD CURRENT (mA)
EFFICIENCY (%)
LIM = GND
(125mA)
LIM = OPEN
(250mA)
LIM = V
CC
(500mA)
100
200
300
500
400
600
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
CURRENT LIMIT vs. SUPPLY VOLTAGE
MAX1605 toc09
SUPPLY VOLTAGE (V)
CURRENT LIMIT (mA)
LIM = OPEN
LIM = GND
LIM = V
CC
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.)
100
200
300
500
400
600
0
3
6
9
12
CURRENT LIMIT vs. INPUT VOLTAGE
MAX1605 toc10
INPUT VOLTAGE (V)
CURRENT LIMIT (mA)
LIM = OPEN
LIM = V
CC
LIM = GND
0
5
15
10
20
25
0
2
1
3
4
5
SUPPLY CURRENT vs.
SUPPLY VOLTAGE (NO LOAD)
MAX1605 toc11
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (
µ
A)
0
1.0
0.5
2.0
1.5
2.5
3.0
0
10
5
15
20
25
MAX1605 toc12
LOAD CURRENT (mA)
SUPPLY CURRENT (mA)
SUPPLY CURRENT vs. LOAD CURRENT
LIM = GND
(125mA)
LIM = OPEN
(250mA)
LIM = V
CC
(500mA)
17.9V
2V
18.1V
18
4V
6V
A
2V/div
200
µs/div
LINE TRANSIENT
MAX1605 toc13
A: V
IN
= V
CC
= 2.4V TO 5.5V
B: V
OUT
= 18V, R
OUT
= 3.6k
Ω
B
100mV/div
0
17.9V
500mA
18.1V
18V
0
10mA
I
OUT
10mA/div
40
µs/div
LOAD TRANSIENT
MAX1605 toc14
V
OUT
= 18V, I
OUT
= 1mA TO 10mA
V
CC
= 3.3V, V
IN
= 3.6V
V
OUT
100mV/div
I
L1
500mA/div
74
76
78
80
82
84
86
88
90
0
5
10
15
20
25
EFFICIENCY vs. LOAD CURRENT
(L1 = 100
µH)
MAX1605 toc08
LOAD CURRENT (mA)
EFFICIENCY (%)
LIM = OPEN
(250mA)
LIM = V
CC
(500mA)
LIM = GND
(125mA)
10V
0
0
20V
500mA
250mA
0
2V
4V
V
SHDN
2V/div
200
µs/div
SHUTDOWN WAVEFORM
MAX1605 toc15
V
OUT
= 18V, R
OUT
= 1.8k
Ω
V
CC
= 3.3V, V
IN
= 3.6V
I
L1
250mA/div
V
OUT
10V/div