MAX749ESA Maxim Integrated Products, MAX749ESA Datasheet - Page 3

• Manufacturer Part Number: MAX749ESA
• Description: Display Drivers Digitally Adjustable able LCD Bias Supply
• Manufacturer: Maxim Integrated Products

__________________________________________Typical Operating Characteristics
(T
A
= +25°C, L = 47µH, unless otherwise noted.)
85
80
75
70
65
0
10
EFFICIENCY vs. OUTPUT
-24V
OUTPUT CURRENT (mA)
CURRENT – PNP
20
_______________________________________________________________________________________
400
350
300
250
200
150
100
50
85
80
75
70
65
V+ = 3V
R
R
TRANSISTOR: ZTX750
30
0
BASE
SENSE
-24
2
= 470
LOAD CURRENT vs. INPUT VOLTAGE
R
R
TRANSISTOR = ZTX750
40
= 0.25
BASE
SENSE
-22
Digitally Adjustable LCD Bias Supply
-12V
V+ = 3V
R
R
TRANSISTOR : ZTX750
BASE
SENSE
-5V
-20
= 470
= 0.25
50
3
= 470
OUTPUT VOLTAGE (V)
INPUT VOLTAGE (V)
OUTPUT VOLTAGE
= 0.25
-18
-5mA
EFFICIENCY vs.
-16
60
-20mA
-14
4
-12
-48V
80
78
76
74
72
70
68
66
64
-24V
-10
-12V
0
5
-5V
-8
-40mA
10
-6
20
EFFICIENCY vs. OUTPUT
OUTPUT CURRENT (mA)
-24V
6
-4
30
CURRENT – PNP
40
V+ = 3V
R
R
TRANSISTOR = ZTX750
BASE
SENSE
50
-12V
60
500
450
400
350
300
250
200
150
100
= 160
85
80
75
70
65
50
= 0.25
0
70
-24
2
80
-5V
-20mA
LOAD CURRENT vs. INPUT VOLTAGE
R
R
TRANSISTOR = ZTX750
V+ = 5V
R
TRANSISTOR : SMD10P05L
-22
BASE
SENSE
SENSE
90
-20
= 160
= 0.25
100
= 0.25
3
OUTPUT VOLTAGE (V)
-18
OUTPUT VOLTAGE
INPUT VOLTAGE (V)
EFFICIENCY vs.
-16
-5mA
85
80
75
70
65
-14
4
-48V
-12
0
-24V
-40mA
-5V
-12V
-10
5
V+ = 5V
R
TRANSISTOR: SMD10P05L
5
SENSE
10
-8
EFFICIENCY vs. OUTPUT
OUTPUT CURRENT (mA)
CURRENT – MOSFET
-6
15
= 0.25
-12V
20
-4
6
-5V
25
30
-24V
35
40
45
50
3