MAX1778/MAX1880–MAX1885
Quad-Output TFT LCD DC-DC
Converters with Buffer
4 _______________________________________________________________________________________
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= +3.0V, SHDN = IN, V
SUPP
= V
SUPN
= V
SUPB
= V
SUPL
= 10V, LDOOUT = FBL, BUF- = BUFOUT, BUF+ = FLTSET = TGND =
PGND = GND, C
REF
= 0.22µF, C
BUF
= 1µF, T
A
= 0°C to +85°C. Typical values are at T
A
= +25°C, unless otherwise noted.)
PARAMETER
SYMBOL CONDITIONS MIN TYP MAX UNITS
NEGATIVE CHARGE PUMP (MAX1778/MAX1880/MAX1881/MAX1882 ONLY)
SUPN Input Supply Range
V
SUPN
2.7 13 V
Operating Frequency
f
CHP
0.5 x f
OSC
Hz
FBN Regulation Voltage
V
FBN
-50 0 +50 mV
FBN Input Bias Current
I
FBN
V
FBN
= 0 -50 +50 nA
DRVN PCH On-Resistance
R
PCH
ON
510Ω
V
FBN
= +50mV
24Ω
DRVN NCH On-Resistance R
NCH
ON
V
FBN
= -50mV
20 kΩ
Maximum RMS DRVN Current
0.1 A
FBN Power-Ready Trip Level
Falling edge 80 125 165 mV
FBN Fault Trip Level
Rising edge 80 140 190 mV
LOW-DROPOUT LINEAR REGULATOR (MAX1778/MAX1881/MAX1883/MAX1884 ONLY)
SUPL Input Supply Range V
SUPL
4.5 15 V
SUPL Undervoltage Lockout Rising edge, 50mV hysteresis (typ) 3.8 4 4.3 V
SUPL Quiescent Current I
SUPL
I
LDO
= 100µA 120 220 µA
I
LDO
= 40mA 130 300
Dropout Voltage (Note 1) V
DROP
LDO is set to
regulate at 9V
I
LDO
= 5mA 70
mV
FBL Regulation Voltage V
FBL
V
SUPL
= 10V, LDO regulating at 9V,
I
LDO
= 15mA
1.235 1.25 1.265 V
LDO Load Regulation
V
SUPL
= 10V, LDO regulating at 9V,
I
LDO
= 100µA to 40mA
1.2 %
LDO Line Regulation
V
SUPL
= 4.5V to 15V, FBL = LDOOUT,
I
LDO
= 15mA
0.02 %/V
FBL Input Bias Current I
FBL
V
FBL
= 1.25V -0.8 +0.8
µA
LDO Current Limit I
LDOLIM
V
SUPL
= 10V, V
LDOOUT
= 9V, V
FBL
= 1.2V 40 130 220
mA
VCOM BUFFER
SUPB Input Supply Range V
SUPB
4.5 13
V
SUPB Quiescent Current I
SUPB
V
SUPB
= 13V 420 850
µA
BUFOUT Leakage Current -10 +10
µA
Power-Supply Rejection Ratio PSRR V
SUPB
= 4.5V to 13V, V
CM
= 2.25V 85 98
dB
Input Common-Mode Voltage
Range
V
CM
|V
OS
| < 10mV 1.2 8.8
V
Common-Mode Rejection Ratio CMRR V
CM
= 1.2V to 8.8V 75
dB
Input Bias Current I
BIAS
V
CM
= 5V -100 -10 +100
nA
Input Offset Current I
OS
V
CM
= 5V -100 +100
nA
Gain Bandwidth Product GBW C
BUF
= 1µF 13
kHz
(9 Seiten)
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