Not Recommended for New Designs. Refer to MAX20078 for New Designs. EVALUATION KIT AVAILABLE Click here for production status of specific part numbers. MAX16818 1.5MHz, 30A High-Efficiency, LED Driver with Rapid LED Current Pulsing General Description Benefits and Features The MAX16818 pulse-width modulation (PWM) Flexible Architecture Supports a Range of LED LED driver controller provides high-output-current Lighting Applications with Minimal Component Count capability in a compact package with a minimum number Up to 30A Output Current of external components. The MAX16818 is suitable for 4.75V to 5.5V or 7V to 28V Input Voltage Range use in synchronous and nonsynchronous step-down Average-Current-Mode Control (buck) topologies, as well as in boost, buck-boost, SEPIC, True-Differential Remote-Sense Input and Cuk LED drivers. The MAX16818 is the first LED Frequency Management Reduces EMI and driver controller that enables Maxims technology for Interference with Other System Clocks fast LED current transients of up to 20A/s and 30kHz Programmable Switching Frequency or External dimming frequency. Synchronization from 125kHz to 1.5MHz This device utilizes average-current-mode control that Clock Output for 180 Out-of-Phase Operation enables optimal use of MOSFETs with optimal charge and Integrated Protection Features and Thermally on-resistance characteristics. This results in the minimized Enhanced Package Improve System Reliability need for external heatsinking, even when delivering up Output Overvoltage and Hiccup-Mode Overcurrent to 30A of LED current. True differential sensing enables Protection accurate control of the LED current. A wide dimming range Thermal Shutdown is easily implemented to accommodate an external PWM Thermally Enhanced 28-Pin TQFN Package signal. An internal regulator enables operation over a wide input voltage range: 4.75V to 5.5V or 7V to 28V and above Ordering Information with a simple external biasing device. The wide switching frequency range, up to 1.5MHz, allows for the use of small PART TEMP RANGE PIN-PACKAGE inductors and capacitors. MAX16818ATI+ -40C to +125C 28 TQFN-EP* The MAX16818 features a clock output with 180 phase MAX16818ETI+ -40C to +85C 28 TQFN-EP* delay to control a second out-of-phase LED driver to +Denotes a lead(Pb)-free/RoHS-compliant package. reduce input and output filter capacitors size or to mini- *EP = Exposed pad. mize ripple currents. The MAX16818 offers programmable hiccup, overvoltage, and overtemperature protection. Simplified Diagram The MAX16818ETI+ is rated for the extended tempera- 7V TO 28V ture range (-40C to +85C) and the MAX16818ATI+ is rated for the automotive temperature range (-40C to C1 +125C). This LED driver controller is available in a lead- IN Q1 EN DH free, 0.8mm high, 5mm x 5mm 28-pin TQFN package with V LED an exposed pad. ILIM L1 Applications MAX16818 Q2 Front Projectors/Rear Projection TVs DL C2 Portable and Pocket Projectors Q3 LCD TVs and Display Backlight OVI CSP R1 PGND CLP Package Information appears at end of data sheet. HIGH-FREQUENCY PULSE TRAIN NOTE: MAXIM TOPOLOGY 19-0666 Rev 5 4/18MAX16818 1.5MHz, 30A High-Efficiency, LED Driver with Rapid LED Current Pulsing Absolute Maximum Ratings IN to SGND ...........................................................-0.3V to +30V Continuous Power Dissipation (T = +70C) A BST to SGND ........................................................-0.3V to +35V 28-Pin TQFN (derate 34.5mW/C above +70C) ......2758mW BST to LX ................................................................-0.3V to +6V Operating Temperature Range DH to LX .................................... -0.3V to (V - V ) + 0.3V MAX16818ATI+ ..........................................-40C to +125C BST LX DL to PGND ............................................. -0.3V to (V + 0.3V) MAX16818ETI+ .............................................. -40C to +85C DD V to SGND ..........................................................-0.3V to +6V Maximum Junction Temperature .....................................+150C CC V , V to PGND .................................................-0.3V to +6V Storage Temperature Range ............................ -60C to +150C CC DD SGND to PGND ....................................................-0.3V to +0.3V Lead Temperature (soldering, 10s) .................................+300C All Other Pins to SGND ............................ -0.3V to (V + 0.3V) CC 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 = 5V, V = V , T = T = T to T , unless otherwise noted. Typical specifications are at T = +25C.) (Note 1) CC DD CC A J MIN MAX A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS SYSTEM SPECIFICATIONS 7 28 Input Voltage Range V V IN Short IN and V together for 5V input CC 4.75 5.50 operation Quiescent Supply Current I EN = V or SGND, not switching 2.7 5.5 mA Q CC LED CURRENT REGULATOR No load, V = 4.75V to 5.5V, f = 500kHz 0.594 0.6 0.606 SENSE+ to SENSE- Accuracy IN SW V (Note 2) No load, V = 7V to 28V, f = 500kHz 0.594 0.6 0.606 IN SW Clock Soft-Start Time t 1024 SS Cycles STARTUP/INTERNAL REGULATOR V Undervoltage Lockout UVLO V rising 4.1 4.3 4.5 V CC CC V Undervoltage Hysteresis 200 mV CC V Output Voltage V = 7V to 28V, I = 0 to 60mA 4.85 5.1 5.30 V CC IN SOURCE MOSFET DRIVERS Output Driver Impedance R Low or high output, I = 20mA 1.1 3.0 W ON SOURCE/SINK Output Driver Source/Sink Current I ,I 4 A DH DL Nonoverlap Time t C = 5nF 35 ns NO DH/DL OSCILLATOR Switching Frequency Range 125 1500 kHz Switching Frequency R = 500k W 121 125 129 T Switching Frequency f R = 120k W 495 521 547 kHz SW T Switching Frequency R = 39.9kW 1515 1620 1725 T 120k W R 500kW -5 +5 T Switching Frequency Accuracy % 40k W R 120kW -8 +8 T Maxim Integrated 2 www.maximintegrated.com