MAX1513/MAX1514 19-3047 Rev 0 10/03 TFT-LCD Power-Supply Controllers General Description Features 2.7V to 5.5V Input Supply Range The MAX1513/MAX1514 provide complete power-sup- ply solutions for active-matrix thin-film transistor (TFT) Input-Supply Undervoltage Lockout liquid-crystal displays (LCDs). Both devices include a Current-Mode Step-Up Controller high-performance step-up regulator controller, three lin- Fast Transient Response to Pulsed Load ear-regulator controllers, and an adjustable delay block High Efficiency for startup sequencing. The MAX1513 includes an Lossless Current Sensing additional linear-regulator controller and a high-perfor- 430kHz/750kHz/1.5MHz Switching Frequency mance buffer amplifier. The MAX1513/MAX1514 can Linear-Regulator Controllers for V , V GON GOFF operate from 2.7V to 5.5V input supplies and provide Linear-Regulator Controller for Logic Supply overload protection with timer delay latch on all the reg- ulated outputs. High-Performance Buffer Amplifier (MAX1513 Only) The step-up regulator controller drives an external N- Additional Linear-Regulator Controller channel MOSFET to generate the regulated supply volt- (MAX1513 Only) age for the panel source-driver ICs. Its current-mode Power-Up Sequence and V Delay Control GON control architecture provides fast transient response to V , V , V , V Shutdown Control MAIN GON GOFF GAMMA pulsed loads. The high switching frequency (up to Timer-Delay Fault Latch for All Outputs 1.5MHz) allows the use of ultra-small inductors and ceramic capacitors while achieving efficiencies over 85% Thermal-Overload Protection using lossless current sensing. The internal soft-start lim- its the input surge current during startup. Ordering Information The gate-on and gate-off linear-regulator controllers of the MAX1513/MAX1514 provide regulated TFT gate-on PART TEMP RANGE PIN-PACKAGE and gate-off supplies. The gate-on supply is activated MAX1513ETP -40C to +85C 20 Thin QFN 4mm x 4mm after an adjustable delay following the step-up regulator. MAX1514ETP -40C to +85C 20 Thin QFN 4mm x 4mm The logic linear-regulator controller can be used to cre- ate a low-voltage logic supply. The gamma linear-regula- Minimal Operating Circuit tor controller of the MAX1513 can be used to generate a gamma-correction reference supply or another general- purpose supply rail. The MAX1513s high-performance VIN IN CS+ buffer amplifier can drive the LCD backplane (VCOM) or the gamma-correction divider string. CS- V MAIN The MAX1513/MAX1514 are available in 4mm 4mm SDFR GATE 20-pin thin QFN packages with a maximum thickness of GND DEL 0.8mm, suitable for ultra-thin LCD panel design. FB Applications MAX1513 MAX1514 DRVL Notebook Computer Displays VLOGIC FBL LCD Monitors and TVs DRVP Automotive Displays FBP V GON VMAIN DRVG V GAMMA FBG SUPB DRVN FBPB FBN V GOFF Pin Configuration appears at end of data sheet. TO VCOM OUTB REF 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 AVAILABLETFT-LCD Power-Supply Controllers ABSOLUTE MAXIMUM RATINGS FB, FBP, FBN, FBG, FBL, IN, CS+, OUTB Continuous Output Current ....................................75mA CS-, SDFR to GND ...............................................-0.3V to +6V Continuous Power Dissipation (T = +70C) A DEL, GATE, REF to GND .............................-0.3V to (V + 0.3V) 20-Pin TQFN (derate 16.9mW/C above +70C) .......1349mW IN SUPB to GND .........................................................-0.3V to +14V Operating Temperature Range ...........................-40C to +85C OUTB, FBPB to GND ..............................-0.3V to (V + 0.3V) Junction Temperature......................................................+150C SUPB DRVP, DRVG, DRVL to GND..................................-0.3V to +30V Storage Temperature Range .............................-65C to +150C DRVN to GND .....................................(V - 28V) to (V + 0.3V) Lead Temperature (soldering, 10s) .................................+300C IN IN 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 = 3V, V = 10V, SDFR = IN, C = 0.22F, T = 0C to +85C. Typical values are at T = +25C, unless IN SUPB REF A A otherwise noted.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS IN Supply Range V 2.7 5.5 V IN V rising 2.5 2.7 2.9 IN Undervoltage-Lockout IN V 350mV typical hysteresis V UVLO Threshold V falling 2.2 2.35 2.5 IN IN Quiescent Current I V = V = V = V = 1.5V, V = 0 1.25 mA IN FB FBP FBL FBG FBN IN Shutdown Current V = 0, V = 1.5V 150 A SDFR FBL REF Output Voltage -2A < I < 100A, 2.7V < V < 5.5V 1.231 1.250 1.269 V REF IN Temperature rising +160 Thermal Shutdown C Hysteresis 15 Duration to Trigger Fault Latch 43.6 ms MAIN STEP-UP CONTROLLER SDFR = IN 1.275 1.500 1.725 Operating Frequency f SDFR = REF 0.60 0.75 0.90 MHz OSC SDFR = unconnected 0.43 Oscillator Maximum Duty Cycle 80 85 90 % FB Regulation Voltage V V - V = 0 1.237 1.25 1.263 V FB CS+ CS- FB Fault Trip Level V falling 0.96 1.00 1.04 V FB FB Load Regulation 0 < (V - V ) < 50mV -1 % CS+ CS- FB Line Regulation V = 2.7V to 5.5V 0.1 0.2 % / V IN FB Input Bias Current V = 1.5V -100 +100 nA FB CS+ Input Current 2.2V < V < 6V 90 A CS+ CS- Input Current 2.2V < V < 6V -1 +1 A CS- Current-Limit Threshold V - V , 2.2V < V < 6V 100 125 150 mV CS+ CS- CS+ Gate-Drive Output High or low 3 5 Soft-Start Period t 2.7 ms SS Soft-Start Step Size V / 128 V REF GATE-ON LINEAR-REGULATOR CONTROLLER (REG P) FBP Regulation Voltage V I = 50A 1.225 1.250 1.275 V FBP DRVP FBP Fault Trip Level V falling 0.96 1.00 1.04 V FBP FBP Input Bias Current V = 1.5V -250 +250 nA FBP 2 MAX1513/MAX1514