Electrical characteristics (continued) – Rainbow Electronics MAX1885 User Manual
Page 7
MAX1778/MAX1880–MAX1885
Quad-Output TFT LCD DC-DC
Converters with Buffer
_______________________________________________________________________________________
7
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
= -40°C to +85°C, unless otherwise noted.) (Note 2)
PARAMETER
SYMBOL
CONDITIONS
MIN
MAX
UNITS
POSITIVE CHARGE PUMP (MAX1778/MAX1880/MAX1881/MAX1882 ONLY)
SUPP Input Supply Range
V
SUPP
2.7
13
V
FBP Regulation Voltage
V
FBP
1.2
1.3
V
FBP Input Bias Current
I
FBP
V
FBP
= 1.5V
-50
+50
nA
DRVP PCH On-Resistance
R
PCH(ON)
10
Ω
V
FBP
= 1.2V
4
Ω
DRVP NCH On-Resistance
R
NCH(ON)
V
FBP
= 1.3V
20
k
Ω
FBP Power-Ready Trip Level
Rising edge
1.09
1.16
V
NEGATIVE CHARGE PUMP (MAX1778/MAX1880/MAX1881/MAX1882 ONLY)
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
-50
+50
nA
DRVN PCH On-Resistance
R
PCH(ON)
10
Ω
V
FBN
= +50mV
4
Ω
DRVN NCH On-Resistance
R
NCH(ON)
V
FBN
= -50mV
20
k
Ω
FBN Power-Ready Trip Level
Falling edge
80
165
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
4.3
V
SUPL Quiescent Current
I
SUPL
I
LDO
= 100µA
240
µA
Dropout Voltage (Note 1)
V
DROP
LDO regulating to 9V, I
LDO
= 40mA
330
mV
FBL Regulation Voltage
V
FBL
V
SUPL
= 10V, LDO regulating to 9V,
I
LDO
= 15mA
1.222
1.265
V
LDO Load Regulation
V
SUPL
= 10V, LDO regulating to 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
-1.2
+1.2
µA
LDO Current Limit
I
LDOLIM
V
SUPL
= 10V, V
LDOOUT
= 9V, V
FBL
= 1.2V
40
260
mA
VCOM BUFFER
SUPB Input Supply Range
V
SUPB
4.5
13
V
SUPB Quiescent Current
I
SUPB
V
SUPB
= 13V
850
µA
BUFOUT Leakage Current
-10
+10
µA
Input Common-Mode Voltage
V
CM
|V
OS
| < 10mV
1.2
8.8
V