Not Recommended for New Designs. Refer to MAX20078 for New Designs. EVALUATION KIT AVAILABLE Click here for production status of specific part numbers. MAX16821A/MAX16821B/ High-Power Synchronous HBLED MAX16821C Drivers with Rapid Current Pulsing General Description Features Up to 30A Output Current The MAX16821A, MAX16821B, and MAX16821C pulse- True-Differential Remote Output Sensing width-modulation (PWM) LED driver controllers provide high output-current capability in a compact package with a Average Current-Mode Control minimum number of external components. The 4.75V to 5.5V or 7V to 28V Input Voltage Range MAX16821AMAX16821C are suitable for use in synchro- 0.1V/0.03V LED Current-Sense Options Maximize nous and nonsynchronous step-down (buck), boost, buck- Efficiency (MAX16821B/MAX16821C) boost, SEPIC, and Cuk LED drivers. A logic input (MODE) Thermal Shutdown allows the devices to switch between synchronous buck Nonlatching Output-Overvoltage Protection and boost modes of operation. These devices are the first Low-Side Buck Mode with or without Synchronous high-power drivers designed specifically to accommodate Rectification common-anode HB LEDs. High-Side Buck and Low-Side Boost Mode with or without Synchronous Rectification The ICs offer average current-mode control that enable 125kHz to 1.5MHz Programmable/Synchronizable the use of MOSFETs with optimal charge and on- Switching Frequency resistance figure of merit, thus minimizing the need for Integrated 4A Gate Drivers external heatsinking even when delivering up to 30A of LED current. Clock Output for 180 Out-of-Phase Operation for Second Driver The differential sensing scheme provides accurate control -40C to +125C Operating Temperature Range of the LED current. The ICs operate from a 4.75V to 5.5V supply range with the internal regulator disabled (V Ordering Information CC connected to IN). These devices operate from a 7V to 28V PART TEMP RANGE PIN-PACKAGE input supply voltage with the internal regulator enabled. MAX16821AATI+ -40C to +125C 28 TQFN-EP* The MAX16821AMAX16821C feature a clock output MAX16821BATI+ -40C to +125C 28 TQFN-EP* with 180 phase delay to control a second out-of-phase MAX16821CATI+ -40C to +125C 28 TQFN-EP* LED driver to reduce input and output filter capacitor size +Denotes lead(Pb)-free/RoHS-compliant package. and to minimize ripple currents. The wide switching fre- *EP = Exposed pad. quency range (125kHz to 1.5MHz) allows the use of small inductors and capacitors. Simplified Diagram Additional features include programmable overvoltage 7V TO 28V protection and an output enable function. Applications C1 IN Q1 EN Front Projectors/Rear-Projection TVs DH V LED Portable and Pocket Projectors L1 I.C. LCD TVs and Display Backlight MAX16821 Q2 DL C2 Q3 OVI CSP R1 PGND CLP Typical Operating Circuit and Selector Guide appears at end of data sheet. HIGH-FREQUENCY PULSE TRAIN 19-0881 Rev 4 4/18MAX16821A/MAX16821B/ High-Power Synchronous HBLED MAX16821C Drivers with Rapid Current Pulsing Absolute Maximum Ratings IN to SGND ...........................................................-0.3V to +30V All Other Pins to SGND ............................ -0.3V to (V + 0.3V) CC BST to SGND ........................................................-0.3V to +35V Continuous Power Dissipation (T = +70C) A BST to LX ................................................................-0.3V to +6V 28-Pin TQFN 5mm x 5mm (derate 34.5mW/C DH to LX .......................................-0.3V to (V - V ) + 0.3V above +70C) ...........................................................2758mW BST LX DL to PGND .............................................-0.3V to (V + 0.3V) Operating Temperature Range ......................... -40C to +125C DD V to SGND ..........................................................-0.3V to +6V Junction Temperature ......................................................+150C CC V , V to PGND .................................................-0.3V to +6V Storage Temperature Range ............................ -65C to +150C CC DD SGND to PGND ....................................................-0.3V to +0.3V Lead Temperature (soldering, 10s) .................................+300C V Current .....................................................................300mA 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 = -40C to +125C, unless otherwise noted. Typical values are at T = +25C.) (Note 1) CC DD CC A J A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Internal LDO on 7 28 Input-Voltage Range V IN V Internal LDO off (V connected to V ) 4.75 5.50 CC IN Quiescent Supply Current I V = V or SGND, no switching 2.7 5.5 mA Q EN CC LED CURRENT REGULATOR V = V = 4.75V to 5.5V, f = 500kHz IN CC SW 0.594 0.600 0.606 (MAX16821A) V = 7V to 28V, f = 500kHz IN SW 0.594 0.600 0.606 (MAX16821A) V = V = 4.75V to 5.5V, IN CC 0.098 0.100 0.102 Differential Set Value f = 500kHz (MAX16821B) SW (V + to V -) V SENSE SENSE V = 7V to 28V, f = 500kHz (Note 2) IN SW 0.098 0.100 0.102 (MAX16821B) V = V = 4.75V to 5.5V, IN CC 0.028 0.030 0.032 f = 500kHz (MAX16821C) SW V = 7V to 28V, f = 500kHz IN SW 0.028 0.030 0.032 (MAX16821C) Clock Soft-Start Time t 1024 SS Cycles STARTUP/INTERNAL REGULATOR V Undervoltage Lockout CC UVLO V rising 4.1 4.3 4.5 V CC (UVLO) UVLO Hysteresis V falling 200 mV CC V Output Voltage V = 7V to 28V, I = 0 to 60mA 4.85 5.10 5.30 V CC IN SOURCE MOSFET DRIVER Output Driver Impedance Low or high output, I = 20mA 1.1 3 SOURCE/SINK Output Driver Source/Sink I , I 4 A DH DL Current Nonoverlap Time t C = 5nF 35 ns NO DH/DL Maxim Integrated 2 www.maximintegrated.com