MAX8753 19-3919 Rev 0 1/06 TFT LCD DC-DC Converter with Integrated Charge Pumps General Description Features The MAX8753 quadruple-output DC-DC converter pro- 3 Integrated DC-DC Converters, 1 LDO vides the regulated voltages required by active-matrix, 1MHz Current-Mode PWM Boost Regulator thin-film transistor (TFT), liquid-crystal displays (LCDs). Up to +13V Main High-Power Output It includes a high-power step-up regulator (V ), two MAIN low-power charge pumps (V and V ), and a low- 1% Accuracy POS NEG voltage 300mA linear regulator (V ). High Efficiency (90%) LOGIC The step-up DC-DC converter is a high-frequency Dual Charge-Pump Outputs (1MHz) current-mode regulator with a built-in power No External Diodes for Positive Charge Pump MOSFET that allows the use of ultra-small inductors and Up to +28V Positive Charge-Pump Output ceramic capacitors. It provides fast transient response Negative Charge-Pump Output to pulsed loads and includes an automatic pulse-skip- 300mA Logic Linear Regulator ping mode that increases efficiency over a wide-load current range. The 1.5A current limit allows a +10V out- +2.6V to +5.5V Input Operating Range put at more than 300mA from a +3.3V input. 0.8mA Quiescent Current The two charge pumps independently regulate one positive and one negative output voltage. The positive Internal Supply Sequencing and Soft-Start charge pump is a voltage tripler that accepts an input Thermal Protection voltage up to +13V and delivers a 20mA output up to +28V without external switches or diodes. The negative Ultra-Thin, 28-Pin TQFN Package (0.8mm max) charge pump inverts an input voltage up to +24V and delivers a 20mA negative output using external diodes. Ordering Information The logic linear regulator converts the ICs +2.6V-to- PART TEMP RANGE PIN-PACKAGE +5.5V input to a regulated +2.5V or adjustable output. 28 Thin QFN The MAX8753 is available in a 28-pin thin QFN pack- MAX8753ETI+ -40C to 85C (5mm x 5mm) age with a maximum thickness of 0.8mm for ultra-thin LCD panel design. +Denotes lead-free package. Applications Minimal Operating Circuit Notebook Computers, PDAs V Car Navigation Displays V +2.6V TO +5.5V IN MAIN LCD Monitors IN PGND Pin Configuration TOP VIEW V MAIN GND SUPN FB 21 20 19 18 17 16 15 PGND 14 22 REF C3P V NEG N.C. 23 13 GND SHDN MAX8753 FBN 24 12 N.C. DLP LCDON V LOGIC IN SHDN 25 11 OUTL MAX8753 REF LCDON 26 10 OUTL V POS FBL OUTP FBL C1N 27 9 DLP 28 8 FBP C1P FBP 12 3 45 6 7 TQFN Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct at 1-888-629-4642, or visit Maxims website at www.maxim-ic.com. EVALUATION KIT AVAILABLE SUPP LX N.C. N.C. C2N SUPN C2P C3P OUTP I.C. INTG I.C. FBN FB C1N INTG C1P C2N LX C2P SUPPTFT LCD DC-DC Converter with Integrated Charge Pumps ABSOLUTE MAXIMUM RATINGS IN, SHDN, LCDON to GND ......................................-0.3V to +6V SUPN to PGND.......................................................-0.3V to +30V C3P to PGND.........................................-0.3V to (V + 0.3V) DLP, OUTL, FBL, FBP, FBN, INTG, FB, SUPN Continuous Power Dissipation (T = +70C) REF to GND ............................................-0.3V to (V + 0.3V) A IN PGND to GND .......................................................-0.3V to +0.3V 28-Pin 5mm x 5mm TQFN (derated 21.3mW/C above +70C)............................................................1702mW LX to PGND ............................................................-0.3V to +14V SUPP to PGND .......................................................-0.3V to +14V Operating Temperature Range .......................... -40C to +85C Junction Temperature......................................................+150C C1N, C2N to PGND ................................-0.3V to (V + 0.3V) SUPP Storage Temperature Range .............................-65C to +150C OUTP to PGND ........................................(V - 0.3V) to +30V SUPP C1P to C1N, C2P to C2N, OUTP to C2P ................-0.3V to +14V Lead Temperature (soldering, 10s) .................................+300C Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. ELECTRICAL CHARACTERISTICS (Circuit of Figure 1, V = 3.0V, SHDN = LCDON = IN, V = V = 10V, PGND = GND, C = 0.22F, C = 470pF, T = IN SUPP SUPN INTG A REF 0C to +85C. Typical values are at T = +25C, unless otherwise noted.) A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS INPUT SUPPLIES Input Supply Range V 2.6 5.5 V IN Input Undervoltage Threshold V V rising, 100mV hysteresis (typ) 2.1 2.3 2.5 V UVLO IN IN Quiescent Supply Current I V = V = 1.5V, V = -0.2V 0.8 1.5 mA IN FB FBP FBN IN Shutdown Current V = 0, V = 5V 0.1 10 A SHDN IN SUPP Supply Range V 713V SUPP SUPP Quiescent Current I V = 1.5V 0.4 0.8 mA SUPP FBP SUPP Shutdown Current V = 0, V = 14V, OUTP floating 0.1 10 A SHDN SUPP SUPN Supply Range V 724V SUPN SUPN Quiescent Current I V = -0.2V 0.4 0.8 mA SUPN FBN SUPN Shutdown Current V = 0, V = 24V 0.1 10 A SHDN SUPN MAIN BOOST CONVERTER Output Voltage Range V V 13 V MAIN IN FB Regulation Voltage V 1.232 1.245 1.258 V FB FB Input Bias Current I V = 1.25V, INTG = GND 125 275 nA FB FB FB Undervoltage Shutdown FB falling 75 125 200 mV Threshold Operating Frequency f 0.85 1.00 1.15 MHz OSC Oscillator Maximum Duty Cycle 78 85 90 % Load Regulation I = 0 to 100mA, V = 10V 0.2 % MAIN MAIN Line Regulation 0.1 %/V INTG Transconductance 320 S LX Switch On-Resistance R I = 100mA 0.35 0.7 LX(ON) LX LX Leakage Current I V = 13V, V = 0 0.01 20 A LX LX SHDN 2 MAX8753