Max8727 tft-lcd step-up dc-dc converter, Typical operating characteristics, Electrical characteristics (continued) – Rainbow Electronics MAX8727 User Manual
Page 4
MAX8727
TFT-LCD Step-Up DC-DC Converter
4
_______________________________________________________________________________________
Note 1: Specifications to -40
°C are guaranteed by design, not production tested.
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= V
SHDN
= 3V, FREQ = GND, T
A
= -40°C to +85°C, unless otherwise noted.) (Note 1)
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
CONTROL INPUTS
SHDN, FREQ Input Low Voltage
V
IN
= 2.6V to 5.5V
0.3
×
V
IN
V
SHDN, FREQ Input High Voltage
V
IN
= 2.6V to 5.5V
0.7
×
V
IN
V
EFFICIENCY vs. LOAD CURRENT
(1.2MHz OPERATION)
MAX8727 toc01
LOAD CURRENT (mA)
EFFICIENCY (%)
100
10
60
70
80
90
100
50
1
1000
L = 3.6
µH
V
IN
= 5.0V
V
IN
= 3.3V
EFFICIENCY vs. LOAD CURRENT
(640kHz OPERATION)
MAX8727 toc02
LOAD CURRENT (mA)
EFFICIENCY (%)
100
10
60
70
80
90
100
50
1
1000
L = 6.8
µH
V
IN
= 5.0V
V
IN
= 3.3V
LOAD REGULATION
MAX8727 toc03
LOAD CURRENT (mA)
LOAD REGULATION (%)
100
10
-1.5
-1.0
-0.5
0
0.5
-2.0
1
1000
V
IN
= 5.0V
V
IN
= 3.3V
SWITCHING FREQUENCY
vs. INPUT VOLTAGE
MAX8727 toc04
INPUT VOLTAGE (V)
SWITCHING FREQUENCY (kHz)
5.0
4.5
4.0
3.5
3.0
600
700
800
900
1000
1100
1200
1300
1400
500
2.5
5.5
FREQ = IN
FREQ = GND
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX8727 toc05
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (mA)
5.0
4.5
4.0
3.5
3.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
0
2.5
5.5
SWITCHING
NONSWITCHING
SUPPLY CURRENT vs. TEMPERATURE
(SWITCHING)
MAX8727 toc06
TEMPERATURE (
°C)
SUPPLY CURRENT (mA)
80
60
40
20
0
-20
1
2
3
4
5
0
-40
100
V
IN
= 5.0V
V
IN
= 3.3V
Typical Operating Characteristics
(Circuit of Figure 1. V
IN
= 5V, V
MAIN
= 15V, T
A
= +25
°C unless otherwise noted.)