MAX8727 Maxim, MAX8727 Datasheet - Page 4

• Manufacturer Part Number: MAX8727
• Description: TFT-LCD Step-Up DC-DC Converter
• Manufacturer: Maxim

TFT-LCD Step-Up DC-DC Converter
ELECTRICAL CHARACTERISTICS (continued)
(V
(Circuit of Figure 1. V
4
Note 1: Specifications to -40°C are guaranteed by design, not production tested.
CONTROL INPUTS
SHDN, FREQ Input Low Voltage
SHDN, FREQ Input High Voltage
IN
1400
1300
1200
1100
1000
900
800
700
600
500
100
90
80
70
60
50
_______________________________________________________________________________________
= V
2.5
1
SHDN
L = 3.6µH
EFFICIENCY vs. LOAD CURRENT
PARAMETER
3.0
SWITCHING FREQUENCY
= 3V, FREQ = GND, T
(1.2MHz OPERATION)
vs. INPUT VOLTAGE
LOAD CURRENT (mA)
INPUT VOLTAGE (V)
3.5
10
IN
V
IN
4.0
FREQ = IN
= 5V, V
= 3.3V
V
FREQ = GND
IN
= 5.0V
100
4.5
MAIN
5.0
A
= 15V, T
V
V
= -40°C to +85°C, unless otherwise noted.) (Note 1)
IN
IN
1000
5.5
= 2.6V to 5.5V
= 2.6V to 5.5V
A
= +25°C unless otherwise noted.)
100
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
90
80
70
60
50
0
2.5
1
L = 6.8µH
EFFICIENCY vs. LOAD CURRENT
3.0
CONDITIONS
vs. SUPPLY VOLTAGE
(640kHz OPERATION)
SUPPLY CURRENT
SUPPLY VOLTAGE (V)
LOAD CURRENT (mA)
3.5
10
V
NONSWITCHING
IN
4.0
SWITCHING
= 3.3V
V
Typical Operating Characteristics
IN
= 5.0V
100
4.5
5.0
1000
5.5
-0.5
-1.0
-1.5
-2.0
0.5
0
5
4
3
2
1
0
-40
1
0.7 ×
SUPPLY CURRENT vs. TEMPERATURE
MIN
V
IN
-20
LOAD REGULATION
0
LOAD CURRENT (mA)
TEMPERATURE (°C)
TYP
10
(SWITCHING)
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V
20
V
IN
IN
= 5.0V
= 3.3V
40
V
MAX
0.3 ×
IN
V
100
V
= 3.3V
IN
IN
60
= 5.0V
80
UNITS
V
V
1000
100