Rainbow Electronics MAX1543 - Manual (Page 5)

MAX1542/MAX1543
TFT LCD DC-to-DC Converter with
Operational Amplifiers
_______________________________________________________________________________________ 5
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
LX Current Limit I LIM V FB = 1V, duty cycle = 65% 1.2 1.8 A
Current-Sense Transresistance 0.30 0.65 Ω
OPERATIONAL AMPLIFIERS
SUP Supply Range V SUP 4.5 13.0 V
SUP Supply Current I SUP Buffer configuration, V POS_ = 4V, no load 2.1 mA
Input Offset Voltage V OS V CM = V SUP /2, T A = +25ºC 12 mV
Input Bias Current I BIAS NEG1, NEG2, POS1, POS2 ±50 nA
Input Common-Mode Voltage
Range
V CM 0 V SUP V
I OUT_ = 100µA
V SUP -
15
Output Voltage Swing High V OH
I OUT_ = 5mA
V SUP -
150
mV
I OUT_ = -100µA 15
Output Voltage Swing Low V
OL
I OUT_ = -5mA 150
mV
Source 50
Short-Circuit Current To V SUP /2
Sink 50
mA
Output Source-and-Sink Current
Buffer configuration, V POS_ = 4V,
| ∆V
OS | < 10mV
40 mA
POSITIVE GATE-DRIVER TIMING AND CONTROL SWITCHES
DEL Capacitor Charge Current During startup, V DEL = 1.0V 4 6 µA
DEL Turn-On Threshold V TH (DEL) 1.178 1.302 V
CTL Input Low Voltage V IN = 2.6V to 5.5V 0.6 V
CTL Input High Voltage V IN = 2.6V to 5.5V 2 V
SRC Input Voltage Range 28 V
MAX1542 130 V DRN = 8V, CTL = IN,
V DEL = 1.5V MAX1543 180 SRC Input Current I SRC
V DRN = 8V, CTL = AGND, V DEL = 1.5V 30
µA
DRN Input Current I DRN
V DRN = 8V, CTL = AGND, V DEL = 1.5V,
MAX1543
150 µA
MAX1542 10 SRC to COM Switch On-
Resistance
R SRC(ON) V DEL = 1.5V, CTL = IN
MAX1543 30
Ω
DRN to COM Switch On-
Resistance (MAX1543)
R DRN(ON) V DEL = 1.5V, CTL = AGND 60 Ω
COM to PGND Switch On-
Resistance (MAX1543)
R COM(ON) V DEL = 1.1V 350 1800 Ω
ELECTRICAL CHARACTERISTICS (continued)
(V IN = 3V, V SUP = 8V, V SRC = 28V, FREQ = IN (MAX1543), PGND = AGND = 0, T A = -40°C to +85°C, unless otherwise noted.)