Max1747 triple charge-pump tft lcd dc-dc converter, Typical operating characteristics, Electrical characteristics (continued) – Rainbow Electronics MAX1747 User Manual
Page 5
MAX1747
Triple Charge-Pump TFT LCD
DC-DC Converter
_______________________________________________________________________________________
5
PARAMETER
SYMBOL
CONDITIONS
MIN
MAX
UNITS
REFERENCE
Reference Voltage
V
REF
-2
µA < I
REF
< 50
µA
1.222
1.269
V
Reference Undervoltage
Threshold
V
REF
rising
0.95
1.18
V
LOGIC SIGNALS
SHDN Input Low Voltage
0.4
V
SHDN Bias Voltage
I
SHDN
= 22
µA
580
900
mV
SHDN Input Current Range
I
SHDN
For 200kHz to 2MHz operation
3
65
µA
RDY Output Low Voltage
I
SINK
= 2mA
0.5
V
RDY Output High Leakage
V
RDY
= 13V
1
µA
ELECTRICAL CHARACTERISTICS (continued)
(
V
IN
= V
SUPM
= +3.0V, V
SUPP
= V
SUPM
= +5V, TGND = PGND = GND, I
SHDN
= 22µA, C
OUT
= 2
✕
4.7µF, C
REF
= 0.22µF, C
INTG
=
1500pF, V
OUT
= +5V, T
A
= -40°C to +85°C, unless otherwise noted.) (Note 1)
Note 1: Specifications from 0
°C to -40°C are guaranteed by design, not production tested.
Typical Operating Characteristics
(Circuit of Figure 1, V
IN
= V
SUPM
= +3.3V, T
A
= +25°C, unless otherwise noted.)
4.97
4.99
4.98
5.01
5.00
5.02
5.03
0
200
100
300
400
MAX1747 toc01
I
OUT
(mA)
V
OUT
(V)
MAIN OUTPUT EFFICIENCY
vs. LOAD CURRENT
(MAIN CHARGE PUMP ONLY)
V
IN
= 3.3V
V
IN
= 4.0V
V
IN
= 2.8V
40
60
50
80
70
90
100
0
200
100
300
400
MAX1747 toc02
I
OUT
(mA)
EFFICIENCY (%)
MAIN OUTPUT EFFICIENCY
vs. LOAD CURRENT
(MAIN CHARGE PUMP ONLY)
V
OUT
= 5V
V
IN
= 3.3V
V
IN
= 4.0V
V
IN
= 2.8V
40
60
50
80
70
90
100
0
200
100
300
400
MAX1747 toc03
I
OUT
(mA)
EFFICIENCY (%)
MAIN OUTPUT EFFICIENCY
vs. LOAD CURRENT
(MAIN CHARGE PUMP ONLY)
V
OUT
= 5V
V
IN
= 3.3V
V
IN
= 4.0V
V
IN
= 2.8V
V
NEG
= -7V WITH I
NEG
= 10mA
V
POS
= 12V WITH I
POS
= 5mA