Rainbow Electronics MAX1748 - Manual (Page 4)

MAX1748
Triple-Output TFT LCD DC-DC Converter
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PARAMETER SYMBOL CONDITIONS MIN MAX UNITS
Input Supply Range V IN 2.7 5.5 V
Input Undervoltage Threshold V UVLO V IN rising, 40mV hysteresis (typ) 2.2 2.6 V
IN Quiescent Supply Current I IN V FB = V FBP = 1.5V, V FBN = -0.2V 1 mA
SUPP Quiescent Current I SUPP V FBP = 1.5V 0.8 mA
SUPN Quiescent Current I SUPN V FBN = -0.1V 0.8 mA
IN Shutdown Current V SHDN = 0, V IN = 5V 10 µA
SUPP Shutdown Current V SHDN = 0, V SUPP = 13V 10 µA
SUPN Shutdown Current V SHDN = 0, V
SUPN
= 13V 10 µA
MAIN BOOST CONVERTER
Output Voltage Range V MAIN V IN 13 V
FB Regulation Voltage V FB 1.225 1.271 V
FB Input Bias Current I FB V FB = 1.25V, INTG = GND -50 50 nA
Operating Frequency F OSC 0.75 1.25 MHz
Oscillator Maximum Duty Cycle 78 90 %
LX Switch On-Resistance R LX(ON) I LX = 100mA 0.7 Ω
LX Leakage Current I LX V LX = 13V 20 µA
Phase I = soft-start (1.0ms) 0.275 0.500
LX Current Limit I LX(MAX)
Phase IV = fully on (after 3.0ms) 1.1 2.0
A
FB Fault Trip Level 1.07 1.14 V
POSITIVE CHARGE PUMP
SUPP Input Supply Range V SUPP 2.7 13 V
FBP Regulation Voltage V FBP 1.20 1.30 V
FBP Input Bias Current I FBP V FBP = 1.5V -50 50 nA
DRVP PCH On-Resistance 10 Ω
V FBP = 1.213V 4 Ω
DRVP NCH On-Resistance
V FBP = 1.275V 20 k Ω
FBP Power-Ready Trip Level Rising edge 1.091 1.159 V
NEGATIVE CHARGE PUMP
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 = -0.05V -50 50 nA
DRVN PCH On-Resistance 10 Ω
V FBN = 0.035V 4 Ω
DRVN NCH On-Resistance
V FBN = -0.025V 20 k Ω
FBN Power-Ready Trip Level Rising edge 80 165 mV
REFERENCE
Reference Voltage V REF -2 µA < I
REF < 50 µA 1.223 1.269 V
Reference Undervoltage V REF rising 0.9 1.2 V
ELECTRICAL CHARACTERISTICS (continued)
(V IN = +3.0V, SHDN = IN, V SUPP = V SUPN = 10V, TGND = PGND = GND, C REF = 0.22µF, C INTG = 470pF, T A = -40°C to +85°C,
unless otherwise noted.) (Note 1)