Electrical characteristics – Rainbow Electronics MAX1779 User Manual
Page 4
MAX1779
Low-Power Triple-Output TFT LCD DC-DC
Converter
4
_______________________________________________________________________________________
PARAMETER
SYMBOL
CONDITIONS
MIN
MAX
UNITS
Input Supply Range
V
IN
2.7
5.5
V
Input Undervoltage Threshold
V
UVLO
V
IN
rising, 40mV hysteresis (typ)
2.2
2.6
V
IN Quiescent Supply Current
I
IN
V
FB
= V
FBP
= +1.5V, V
FBN
= -0.2V
1
mA
SUPP Quiescent Current
I
SUPP
V
FBP
= +1.5V
0.55
mA
SUPN Quiescent Current
I
SUPN
V
FBN
= -0.1V
0.55
mA
IN Shutdown Current
V
SHDN
= 0, V
IN
= +5V
10
µA
SUPP Shutdown Current
V
SHDN
= 0, V
SUPP
= +13V
10
µA
SUPN Shutdown Current
V
SHDN
= 0, V
SUPN
= +13V
10
µA
MAIN BOOST CONVERTER
Output Voltage Range
V
MAIN
V
IN
13
V
FB Regulation Voltage
V
FB
1.225
1.271
V
FB Input Bias Current
I
FB
V
FB
= +1.25V, INTG = GND
-50
50
nA
Operating Frequency
f
OSC
195
305
kHz
Oscillator Maximum Duty Cycle
79
92
%
LX Switch On-Resistance
R
LX(ON)
I
LX
= 100mA
2.0
Ω
LX Leakage Current
I
LX
V
LX
= +13V
20
µA
LX Current Limit
I
LIM
350
700
mA
FB Fault Trip Level
Falling edge
1.07
1.14
V
POSITIVE CHARGE PUMP
SUPP Input Supply Range
V
SUPP
2.7
13
V
FBP Regulation Voltage
V
FBP
1.20
1.30
V
FBP Input Bias Current
I
FBP
V
FBP
= +1.5V
-50
50
nA
DRVP PCH On-Resistance
10
Ω
V
FBP
= +1.200V
5
Ω
DRVP NCH On-Resistance
V
FBP
= +1.300V
20
k
Ω
FBP Power-Ready Trip Level
Rising edge
1.09
1.16
V
NEGATIVE CHARGE PUMP
SUPN Input Supply Range
V
SUPN
2.7
13
V
FBN Regulation Voltage
V
FBN
-50
50
mV
FBN Input Bias Current
I
FBN
V
FBN
= -0.05V
-50
50
nA
DRVN PCH On-Resistance
10
Ω
V
FBN
= +0.050V
5
Ω
DRVN NCH On-Resistance
V
FBN
= -0.050V
20
k
Ω
FBN Power-Ready Trip Level
Falling edge
80
165
mV
REFERENCE
Reference Voltage
V
REF
-2µA < I
REF
< 50µA
1.223
1.269
V
Reference Undervoltage
V
REF
rising
0.9
1.2
V
ELECTRICAL CHARACTERISTICS
(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)