MAX17116 19-5653 Rev 0 12/10 Dual-Output DC/DC Power Supply for AMOLED General Description Features The MAX17116 includes two current-mode 1.4MHz S 2.3V to 4.2V Input Operating Voltage Range switch mode power-supply (SMPS) regulators for active- S High-Performance PWM Step-Up Regulator matrix organic light-emitting diode (AMOLED) displays. Fixed 4.6V, 250mA Output The positive supply is provided by a step-up regulator High Accuracy (1%) with a synchronous rectifier. The negative supply is provided by an inverting regulator with a synchronous 1.4MHz Switching Frequency rectifier. Built-In 6V/0.25I n-Channel MOSFET with Lossless Current Sensing The step-up DC-DC converter is a high-accuracy 250mA regulator with an integrated power MOSFET switch Built-In 6V/0.5I p-Channel MOSFET and synchronous rectifier. The synchronous rectifier Synchronous Rectifier TM improves efficiency and also provides True Shutdown . Cycle-by-Cycle Current Limit Its 4.6V (fixed) output efficiency exceeds 85% at 150mA More than 85% Efficiency at 150mA from a 3.7V input. A built-in, 7-bit, digital soft-start func- Good Low-Duty Factor Operation tion controls startup inrush currents. S High-Performance PWM Inverting Regulator The inverting DC-DC converter is a high-accuracy Programmable 250mA Output 250mA regulator with a built-in power MOSFET switch and synchronous rectifier. Its -5.4V to -1.5V output effi- High Accuracy (1%) ciency exceeds 80% at 150mA from a 3.7V input. A built- Adjustable Controlled-Output-Voltage Slew Rate in, 7-bit, digital soft-start function controls startup inrush 1.4MHz Switching Frequency currents. The internally set output voltage is adjusted Built-In 14V/0.25I p-Channel Power MOSFET through a unique communication protocol through the with Lossless Current Sensing single EN pin. Built-In 14V/0.25I n-Channel Power MOSFET The IC is available in a 12-pin, 3mm x 3mm x 0.5mm, Synchronous Rectifier ultra-thin DFN package with exposed pad and 0.5mm Cycle-by-Cycle Current Limit lead spacing to facilitate placement on extremely narrow More than 80% Efficiency at 150mA circuit boards and a 24-pin, 4mm x 4mm, thin QFN pack- age with exposed pad. S True Shutdown for Both Outputs S Timer-Delayed Output Undervoltage Shutdown for Applications Both Outputs OLED Displays S Thermal-Overload Protection Phone, DSC Displays S 12-Pin, 3mm x 3mm Ultra-Thin DFN Package and Automobile Navigation 24-Pin, 4mm x 4mm TQFN Package Ordering Information PART TEMP RANGE PIN-PACKAGE MAX17116EVC+ -40NC to +85NC 12 UTDFN** MAX17116ETG+* -40NC to +85NC 24 TQFN** +Denotes a lead(Pb)-free/RoHS-compliant package. *Future productcontact factory for availability. **Exposed pad. True Shutdown is a trademark of Maxim Integrated Products, Inc. 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 AVAILABLEDual-Output DC/DC Power Supply for AMOLED ABSOLUTE MAXIMUM RATINGS IN, EN, IC, OUTP, LXP to AGND .............................-0.3V to +6V Continuous Power Dissipation (T = +70NC) A LXN to IN ...............................................................-14V to +0.3V 12-Pin UTDFN (derate 15.1mW/NC above +70NC) ....1206.6W STEP to AGND ...........................................-0.3V to (V + 0.3V) 24-Pin TQFN (derate 19mW/NC above +70NC) .......1520.9mW IN Operating Temperature Range .......................... -40NC to +85NC PGND to AGND ....................................................-0.3V to +0.3V OUTN to AGND .......................................................-7V to +0.3V Junction Temperature .....................................................+150NC Storage Temperature Range ............................ -65NC to +160NC LXN to OUTN .........................................................-0.3V to +14V LXP, LXN, OUTP, OUTN, IN RMS Current Rating ...............1.6A Lead Temperature (soldering, 10s) ................................+300NC Soldering Temperature (reflow) ......................................+260NC 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 (V = +3.7V, Circuit of Figure 2, V = +4.9V, V = -4.9V, T = 0C to +85C, unless otherwise noted. Typical values are at IN OUTP OUTN A T = +25NC.) (Note 1) A PARAMETER CONDITIONS MIN TYP MAX UNITS IN Input Supply Range 2.3 4.2 V IN Undervoltage-Lockout V rising, hysteresis = 200mV 1.8 2.0 2.2 V IN Threshold IN Quiescent Current EN = IN, no load, not switching 50 90 FA OUTP Quiescent Current EN = IN, no load, not switching 0.8 1.1 mA V Quiescent Current EN = IN, no load 1.6 2.5 mA IN IN Shutdown Current EN = AGND, T = +25NC 1 FA A STEP-UP REGULATOR I = 10mA to 200mA, LOAD OUTP Regulation Voltage 4.554 4.60 4.646 V V = 2.3V to 4.2V IN Falling edge, no hysteresis 3.496 3.68 3.864 OUTP Fault Trip Level V Falling edge, no hysteresis, no timer 2.116 2.3 2.484 OUTP Load Regulation 0 < I < 200mA, DC regulation 0.1 % LOAD Oscillator Frequency 1190 1400 1610 kHz Maximum Load Current V = 2.9V to 4.2V (Note 2) 250 mA IN LXP/OUTP Peak Current Limit Duty cycle = 35% 850 1100 1350 mA LXP nMOS N1 On-Resistance I = 200mA, Figure 3 0.2 0.4 I LXP1 LXP pMOS1 P1 On-Resistance I = 200mA, Figure 3 0.15 0.3 I LXP1 LXP pMOS2 P2 On-Resistance I = 200mA, Figure 3 0.15 0.3 I LXP2 LXP Damping Switch 20 I On-Resistance OUTP Discharge Resistance OUTP to PGND 330 I 7-bit voltage ramp with filtering to prevent high peak Soft-Start Period 2 ms currents INVERTING REGULATOR OUTN Default Regulation At startup: I 10mA to 200mA V = 2.3V to 4.2V -4.949 -4.9 -4.851 V LOAD IN Voltage OUTN Minimum Regulation Lowest DAC code: I 10mA to 200mA LOAD -5.454 -5.4 -5.346 V Voltage V = 2.3V to 4.2V IN 2 MAX17116