MAX1778_12 Datasheet, PDF (15/39 Pages) Maxim Integrated Products – Quad-Output TFT LCD DC-DC Converters with Buffer

MAX1778/MAX1880–MAX1885
Quad-Output TFT LCD DC/DC
Converters with Buffer
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.)
INPUT OFFSET VOLTAGE DEVIATION
vs. TEMPERATURE
1.0
V_SUPB = 13V
V_CM = V_SUPB/2
0.6
INPUT OFFSET VOLTAGE DEVIATION
vs. TEMPERATURE
1.0
V_SUPB = 13V
V_CM = V_SUPB/2
0.6
BUFFER INPUT BIAS CURRENT
vs. COMMON-MODE VOLTAGE
10
V_SUPB = 13V
8
0.2
0.2
-0.2
-0.2
6
V_SUPB = 4.5V
4
-0.6
-0.6
2
0
-40 -15
10
35
60
85
TEMPERATURE (°C)
BUFFER INPUT BIAS CURRENT
vs. BUFFER SUPPLY VOLTAGE
10
8
6
V_CM = V_SUPB / 2
4
4
6
8
10
12
14
V_SUPB (V)
BUFFER SUPPLY CURRENT
vs. BUFFER SUPPLY VOLTAGE
0.50
0.46
0.42
0.38
0.34
V_CM = V_SUPB/2
0.30
4
6
8
10
12
14
V_SUPB (V)
Maxim Integrated
0
-40
12
11
-15
10
35
60
85
TEMPERATURE (°C)
BUFFER INPUT BIAS CURRENT
vs. TEMPERATURE
V_CM = V_SUPB/2
10
9
8
7
6
5
4
-40 -15
10
35
60
85
TEMPERATURE (°C)
NO-LOAD BUFFER SUPPLY CURRENT
vs. TEMPERATURE
1.0
0.9
V_SUPB = 13V
V_CM = V_SUPB/2
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
-40 -15
10
35
60
85
TEMPERATURE (°C)
0
0
0.50
0.46
2 4 6 8 10 12 14
V_CM (V)
BUFFER SUPPLY CURRENT
vs. COMMON-MODE VOLTAGE
V_SUPB = 13V
0.42
0.38
V_SUPB = 4.5V
0.34
0.30
0
2 4 6 8 10 12 14
V_CM (V)
VCOM BUFFER
SMALL-SIGNAL RESPONSE
MAX1778 toc47
4.05V
4.00V
3.95V
A
4.05V
4.00V
B
3.95V
4µs/div
A. V_BUF+ = 3.95V TO 4.05V, 50mV/div
B. BUFOUT = BUF-, 50mV/div
C_BUF = 1µF, V_SUPB = 8V
15