Rainbow Electronics MAX1543 - Manual (Page 4)

MAX1542/MAX1543
TFT LCD DC-to-DC Converter with
Operational Amplifiers
4 _______________________________________________________________________________________
ELECTRICAL CHARACTERISTICS
(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.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
DEL Turn-On Threshold V TH(DEL) 1.178 1.240 1.302 V
DEL Discharge Switch On-
Resistance
During UVLO, V IN = 2.2V 20 Ω
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
CTL Input Leakage Current CTL = AGND or IN -1 +1 µA
CTL-to-SRC Propagation Delay 100 ns
SRC Input Voltage Range 28 V
MAX1542 70 130 V D RN = 8V , C TL = IN ,
V D E L = 1.5V MAX1543 100 180 SRC Input Current I SRC
V DRN = 8V, CTL = AGND, V DEL = 1.5V 15 30
µA
DRN Input Current I DRC
V DRN = 8V, CTL = AGND, V DEL = 1.5V,
MAX1543
90 150 µA
MAX1542 5 10 SRC to COM Switch On-
Resistance
R SRC(ON)
V DEL = 1.5V,
CTL = IN MAX1543 15 30
Ω
DRN to COM Switch On-
Resistance (MAX1543)
R DRN(ON) V DEL = 1.5V, CTL = AGND 30 60 Ω
COM to PGND Switch On-
Resistance (MAX1543)
R COM(ON) V DEL = 1.1V 350 1000 1800 Ω
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
IN Supply Range V IN 2.6 5.5 V
V IN rising 2.3 2.7 IN Undervoltage Lockout
Threshold
V UVLO
V IN falling 2.2 2.5
V
V FB = 1.3V, LX not switching 0.65
IN Quiescent Current I IN
V FB = 1.1V, LX switching 6.5
mA
MAIN STEP-UP REGULATOR
Output Voltage Range V MAIN V IN 13 V
MAX1542 1000 1400
FREQ = AGND 512 768 Operating Frequency f OSC
MAX1543
FREQ = IN 1000 1400
kHz
FB Regulation Voltage V FB No load 1.215 1.260 V
FB Fault Trip Level V FB falling 0.96 1.04 V
FB Line Regulation V IN = 2.6V to 5.5V 0.15 %/V
FB Transconductance ∆I
COMP = 5µA 75 300 µS
LX On-Resistance R LX(ON) 400 m Ω
ELECTRICAL CHARACTERISTICS (continued)
(V IN = 3V, V SUP = 8V, V SRC = 28V, FREQ = IN (MAX1543), PGND = AGND = 0, T A = 0°C to +85°C, typical values at T A = +25°C,
unless otherwise noted.)