MAX8740ETB+T Maxim Integrated Products, MAX8740ETB+T Datasheet - Page 4

• Manufacturer Part Number: MAX8740ETB+T
• Description: Display Drivers Step-Up DC-DC Conver p-Up DC-DC Converter
• Manufacturer: Maxim Integrated Products

Specifications of MAX8740ETB+T

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

TFT-LCD Step-Up DC-DC Converter
(Circuit of Figure 1. V
4
1400
1200
1000
800
600
400
100
_______________________________________________________________________________________
90
80
70
60
50
40
2.5
1
L = 2.7µH
f
OSC
EFFICIENCY vs. LOAD CURRENT
3.0
= 1.2MHz
SWITCHING FREQUENCY
(1.2MHz OPERATION)
vs. INPUT VOLTAGE
LOAD CURRENT (mA)
3.5
INPUT VOLTAGE (V)
10
IN
V
IN
4.0
= 5V, V
= 5.0V
V
IN
FREQ = IN
= 3.3V
FREQ = GND
100
4.5
MAIN
5.0
(R
= 15V, T
SOFT-START
LOAD
1000
5.5
2ms/div
= 30Ω)
A
= +25°C, unless otherwise noted.)
100
0.7
0.6
0.5
0.4
0.3
0.2
0.1
90
80
70
60
50
40
2.5
MAX8740 toc07
1
SUPPLY CURRENT vs. SUPPLY VOLTAGE
L = 5.6µH
f
OSC
EFFICIENCY vs. LOAD CURRENT
= 640kHz
3.0
NONSWITCHING
LOAD CURRENT (mA)
SUPPLY VOLTAGE (V)
10
SWITCHING
3.5
V
IN
V
4.0
= 5.0V
IN
= 3.3V
Typical Operating Characteristics
100
4.5
SWITCHING WAVEFORMS
5.0
(I
LOAD
1000
5.5
400ns/div
= 800mA)
12.9
12.7
12.5
12.3
12.1
11.9
11.7
11.5
0.60
0.55
0.50
0.45
-40
1
OUTPUT VOLTAGE vs. LOAD CURRENT
SUPPLY CURRENT vs. TEMPERATURE
f
L = 2.7µH
OSC
MAX8740 toc08
-20
= 1.2MHz
10
0
LOAD CURRENT (mA)
TEMPERATURE (°C)
(SWITCHING)
V
V
IN
IN
20
V
= 5.0V
= 3.3V
IN
V
100
IN
= 3.3V
= 5.0V
40
60
1000
80
10,000
100