Typical operating characteristics, Electrical characteristics (continued) – Rainbow Electronics MAX1779 User Manual
Page 5
MAX1779
Low-Power Triple-Output TFT LCD DC-DC
Converter
_______________________________________________________________________________________
5
4.98
4.99
5.00
5.01
5.02
0
50
100
150
200
MAIN OUTPUT VOLTAGE vs. LOAD CURRENT
(L = 10
µH, 5V OUTPUT)
MAX1779-01
I
MAIN
(mA)
V
MAIN
(V)
V
IN
= +3.0V
V
IN
= +4.2V
FIGURE 6
50
60
70
90
100
0
50
100
150
200
MAIN STEP-UP CONVERTER EFFICIENCY
vs. LOAD CURRENT
(L = 10
µH, 5V OUTPUT)
MAX1779-02
I
MAIN
(mA)
EFFICIENCY (%)
V
IN
= +3.0V
V
IN
= +4.2V
80
FIGURE 6
4.98
4.99
5.00
5.01
5.02
0
100
50
150
200
250
300
MAIN OUTPUT VOLTAGE vs. LOAD CURRENT
(L = 33
µH, 5V OUTPUT)
MAX1779-03
I
MAIN
(mA)
V
MAIN
(V)
V
IN
= +4.2V
V
IN
= +3.0V
FIGURE 5
50
60
70
80
90
100
0
100
50
150
200
250
300
MAIN STEP-UP CONVERTER EFFICIENCY
vs. LOAD CURRENT
(L = 33
µH, 5V OUTPUT)
MAX1779-04
I
MAIN
(mA)
EFFICIENCY (%)
V
IN
= +4.2V
V
IN
= +3.0V
FIGURE 5
9.96
9.98
10.00
10.02
10.04
0
50
100
150
MAIN OUTPUT VOLTAGE vs. LOAD CURRENT
(L = 33
µH, 10V OUTPUT)
MAX1779-05
I
MAIN
(mA)
V
MAIN
(V)
V
IN
= +3.3V
V
IN
= +5.0V
FIGURE 5
50
60
70
80
90
100
0
50
100
150
MAIN STEP-UP CONVERTER EFFICIENCY
vs. LOAD CURRENT
(L = 33
µH, 10V OUTPUT)
MAX1779-06
I
MAIN
(mA)
EFFICIENCY (%)
V
IN
= +5.5V
V
IN
= +3.3V
FIGURE 5
Typical Operating Characteristics
(Circuit of Figure 5, V
IN
= +3.3V, T
A
= +25°C, unless otherwise noted.)
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= +3.0V, SHDN = IN, V
SUPP
= V
SUPN
= +10V, TGND = PGND = GND, C
REF
= 0.22µF, C
INTG
= 2200pF, T
A
= -40°C to +85°C,
unless otherwise noted.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
MAX
UNITS
LOGIC SIGNALS
SHDN Input Low Voltage
0.25V hysteresis (typ)
0.9
V
SHDN Input High Voltage
2.1
V
SHDN Input Current
I
SHDN
1
µA
RDY Output Low Voltage
I
SINK
= 2mA
0.5
V
RDY Output High Leakage
V
RDY
= +13V
1
µA
Note 1: Specifications to -40°C are guaranteed by design, not production tested.