Typical operating characteristics (continued) – Rainbow Electronics MAX1885 User Manual
Page 12
MAX1778/MAX1880–MAX1885
Quad-Output TFT LCD DC-DC
Converters with Buffer
12
______________________________________________________________________________________
4.75
4.80
4.85
4.90
4.95
5.00
5.05
MAX1778 toc22
V
SUPL
(V)
V
LDOOUT
(V)
LDO OUTPUT VOLTAGE
vs. LDO INPUT VOLTAGE
(INTERNAL LINEAR REGULATOR)
4
8
6
10
12
I
LDOOUT
= 0
I
LDOOUT
= 40mA
5.04
5.02
4.90
0.01
0.1
10
100
4.92
4.96
4.94
5.00
4.98
MAX1778 toc23
I
LDOOUT
(mA)
V
LDOOUT
(V)
1
LDO OUTPUT VOLTAGE
vs. LDO OUTPUT CURRENT
(INTERNAL LINEAR REGULATOR)
4.90
4.96
4.94
4.92
4.98
5.00
5.02
5.04
5.06
5.08
5.10
-40
10
-15
35
60
85
LDO OUTPUT VOLTAGE vs. TEMPERATURE
(INTERNAL LINEAR REGULATOR)
MAX1778 toc24
TEMPERATURE (
°C)
V
LDO
(V)
I
LDOOUT
= 0
I
LDOOUT
= 40mA
0
40
120
80
160
200
MAX1778 toc25
I
LDOOUT
(mA)
V
SUPL
- V
LDOOUT
(mV)
0
20
10
30
40
DROPOUT VOLTAGE
vs. LDO LOAD CURRENT
(INTERNAL LINEAR REGULATOR)
V
LDOOUT
= 5V
0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
0
10
20
30
40
MAX1778 toc26
I
LDOOUT
(mA)
I
SUPL
- I
LDOOUT
(mA)
LDO SUPPLY CURRENT
vs. LDO OUTPUT CURRENT
(INTERNAL LINEAR REGULATOR)
V
LDOOUT
= 5V
Typical Operating Characteristics (continued)
(Circuit of Figure 1, V
IN
= +3.3V, SHDN = IN, V
MAIN
= V
SUPP
= V
SUPN
= V
SUPB
= V
SUPL
= 8V, BUF- = BUFOUT,
BUF+ = FLTSET = TGND = PGND = GND, T
A
= +25°C.)