MAX17014 19-1045 Rev 1 11/09 Low-Cost Multiple-Output Power Supply for LCD TVs General Description Features The MAX17014 multiple-output power-supply controller Optimized for 10.8V to 13.2V Input Supply generates all the supply rails for thin-film transistor 8V to 16.5V Input Supply Range (TFT) liquid-crystal display (LCD) panels in TVs and Selectable Frequency (600kHz/1.2MHz) monitors operating from a regulated 12V input. It includes a step-down and a step-up regulator, a posi- Current-Mode Step-Up Regulator tive and a negative charge pump, two operational Built-In 20V, 3.3A, 110m n-Channel MOSFET amplifiers, and a Dual Mode logic-controlled high- High-Accuracy Output Voltage (1%) voltage switch control block. The MAX17014 can oper- True Shutdown ate from 8V to 16.5V input voltages and is optimized for Fast Load-Transient Response LCD TV panel and LCD monitor applications running High Efficiency directly from 12V supplies. 3ms Internal Soft-Start The step-up and step-down regulators feature internal Current-Mode Step-Down Regulator power MOSFETs and high-frequency operation allow- Built-In 20V, 2.5A, 120m n-Channel MOSFET ing the use of small inductors and capacitors, resulting Fast Load-Transient Response in a compact solution. Both switching regulators use Adjustable Output Voltage Down to 1.25V fixed-frequency current-mode control architectures, Skip Mode at Light Load providing fast load-transient response and easy com- High Efficiency pensation. A current-limit function for internal switches 3ms Internal Soft-Start and output-fault shutdown protect the step-up and Adjustable Positive and Negative Charge-Pump step-down power supplies against fault conditions. The Regulators MAX17014 provides soft-start functions to limit inrush Soft-Start and Timer-Delay Fault Latch for All current during startup. The MAX17014 provides Outputs adjustable power-up timing. Logic-Controlled High-Voltage Integrated The positive and negative charge-pump regulators pro- Switches with Adjustable Delay vide TFT gate driver supply voltages. Both output volt- ages can be adjusted with external resistive Two High-Speed Operational Amplifiers voltage-dividers. The switch control block allows the 150mA Short-Circuit Current manipulation of the positive TFT gate driver voltage. 100V/s Slew Rate 20MHz, -3dB Bandwidth The MAX17014 includes two high-current operational amplifiers designed to drive the LCD backplane 120m p-Channel FET for AV Sequencing DD (VCOM). The amplifier features high output current Input Undervoltage Lockout and Thermal- (150mA), fast slew rate (100V/s), wide bandwidth Overload Protection (20MHz), and rail-to-rail inputs and outputs. A series 48-Pin, 7mm x 7mm Thin QFN Package p-channel MOSFET is integrated to sequence power to AV after the MAX17014 has proceeded through DD normal startup, and provides True Shutdown. The MAX17014 is available in a small (7mm x 7mm), Ordering Information low-profile (0.8mm), 48-pin thin QFN package and operates over a -40C to +85C temperature range. PART TEMP RANGE PIN-PACKAGE 48 Thin QFN Applications MAX17014ETM+ -40C to +85C 7mm x 7mm LCD TV Panels +Denotes a lead(Pb)-free/RoHS-compliant package. LCD Monitor Panels Dual Mode is a trademark of Maxim Integrated Products, Inc. Simplified Operating Circuit and Pin Configuration appear True Shutdown is a trademark of Maxim Integrated Products, Inc. at end of data sheet. Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxims website at www.maxim-ic.com. EVALUATION KIT AVAILABLELow-Cost Multiple-Output Power Supply for LCD TVs ABSOLUTE MAXIMUM RATINGS V , IN2, OVIN, SUP, EN1, EN2, FSEL to GND ......-0.3V to +22V REF Short Circuit to GND...........................................Continuous IN GND1, OGND, CPGND to GND .........................................0.3V RMS LX1 Current (total for both pins)...................................3.2A MODE, DLP, CTL, THR, DEL1, DEL2, VL to GND ...-0.3V to +7.5V RMS GND1 Current (total for both pins) ...............................3.2A REF, FBP, FBN, FB1, FB2, COMP, RMS IN2 Current (total for both pins)....................................3.2A OUT to GND ...........................................-0.3V to (V + 0.3V) RMS LX2 Current (total for both pins)...................................3.2A VL SWI, SWO to GND..................................................-0.3V to +22V RMS CPGND Current............................................................0.8A LX1 to GND1 ..........................................................-0.3V to +22V RMS SWI Current ..................................................................2.4A SWI to SWO............................................................-0.3V to +22V RMS SWO Current ................................................................2.4A SWI to SUI .............................................................-0.3V to +7.5V RMS DRVN, DRVP Current ...................................................0.8A POS1, NEG1, OUT1, POS2, NEG2, RMS VL Current ..................................................................50mA OUT2 to OGND...................................-0.3V to (V + 0.3V) Continuous Power Dissipation (T = +70C) OVIN A DRVN, DRVP to CPGND ...........................-0.3V to (V + 0.3V) 48-Pin Thin QFN SUP LX2 to CPGND ...........................................-0.3V to (V + 0.3V) (derate 38.5mW/C above +70C) .........................3076.9mW IN2 BST to VL................................................................-0.3V to +22V Operating Temperature Range ...........................-40C to +85C SRC to GND ...........................................................-0.3V to +48V Junction Temperature......................................................+160C GON, DRN to GND ...................................-0.3V to (V + 0.3V) Storage Temperature Range .............................-65C to +165C SRC GON to DRN...........................................................-0.3V to +48V Soldering Temperature (reflow) .......................................+260C POS to NEG RMS Current ...................................5mA (Note 1) Note 1: See Figure 6 for the op amp clamp structures. 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 = V = 12V, AV = V = V = 15V, T = 0C to +85C. Typical values are at T = +25C, unless oth- IN IN2 DD OVIN SUP A A erwise noted.) PARAMETER CONDITIONS MIN TYP MAX UNITS GENERAL V , IN2 Input Voltage Range 8.0 16.5 V IN Only LX2 switching (V = V = 1.5V, V = 0) FB1 FBP FBN V + IN2 Quiescent Current 8 mA IN EN1 = EN2 = VL, V = 0 FSEL LX2 not switching (V = V = V = 1.5V, FB1 FB2 FBP V + IN2 Standby Current 2 mA IN V = 0) EN1 = EN2 = VL, V = 0 FBN FSEL V + IN2 Shutdown Current EN1 = EN2 = GND (shutdown) 300 A IN SUP + OVIN Shutdown Current EN1 = EN2 = GND (shutdown) 10 A FSEL = V 1020 1200 1380 IN SMPS Operating Frequency kHz FSEL = GND 510 600 690 Phase Difference Between Step- Down/Positive and Step-Up/Negative 180 Degrees Regulators V Undervoltage Lockout Threshold V rising edge, 100mV typical hysteresis 5.75 6.50 7.25 V IN IN VL REGULATOR I = 25mA, V = V = V = 1.1V, V = VL FB1 FB2 FBP FBN VL Output Voltage 4.9 5.0 5.1 V 0.4V (all regulators switching) VL Undervoltage Lockout Threshold VL rising edge, 100mV typical hysteresis 3.5 3.9 4.3 V 2 MAX17014