Rainbow Electronics MAX1885 - Manual (Page 4)

MAX1778/MAX1880–MAX1885
Quad-Output TFT LCD DC-DC
Converters with Buffer
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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) 5 10 Ω
V FBN = +50mV 2 4 Ω
DRVN NCH On-Resistance R NCH(ON)
V FBN = -50mV 20 k Ω
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