EVALUATION KIT AVAILABLE MAX16819/MAX16820 2MHz High-Brightness LED Drivers with High-Side Current Sense and 5000:1 Dimming General Description Benefits and Features Simple High-Power LED Lighting Design with The MAX16819/MAX16820, step-down constant- Accurate LED Current Control current high-brightness LED (HB LED) drivers provide a Over 25W Output Power cost-effective solution for architectural and ambient High-Side Current Sense lighting, LED bulbs such as MR16 and other LED illumina- Adjustable Constant LED Current tion applications. 5% LED Current Accuracy The MAX16819/MAX16820 operate from a 4.5V to 28V 4.5V to 28V Input Voltage Range input voltage range and feature a 5V/10mA on-board Wide Dimming Range (5000:1) regulator. A high-side current-sense resistor adjusts the Dedicated Dimming-Control Input output current and a dedicated PWM input (DIM) enables 20kHz Maximum Dimming Frequency a wide range of pulsed dimming. Minimizes Number of Components to Save Space The MAX16819/MAX16820 are well suited for applica- and Cost tions requiring a wide input voltage range. The high-side Hysteretic Control: No Compensation current-sensing and an integrated current-setting circuitry Up to 2MHz Switching Frequency minimize the number of external components while deliv- 5V, 10mA On-Board Regulator ering an LED current with 5% accuracy. A hysteretic control algorithm ensures excellent input-supply rejection Ordering Information and fast response during load transients and PWM dim- TEMP PIN- TOP ming. The MAX16819 features a 30% inductor current PART RANGE PACKAGE MARK ripple and the MAX16820 features a 10% current ripple. MAX16819ATT+T -40C to +125C 6 TDFN-EP* +ATB These devices operate up to 2MHz switching frequency, thus allowing for small component size. MAX16820ATT+T -40C to +125C 6 TDFN-EP* +ATC The MAX16819/MAX16820 operate over the -40C to +Denotes a lead(Pb)-free/RoHS-compliant package. +125C automotive temperature range and are available *EP = Exposed pad. in 3mm x 3mm x 0.8mm, 6-pin TDFN packages. T = Tape and reel. Applications Typical Operating Circuit Architectural, Industrial, and Ambient Lighting MR16 and Other LED Bulbs V IN R L Indicators and Emergency Lighting SENSE Pin Configuration C IN TOP VIEW 6 5 4 C VCC MAX16819 IN V CC MAX16820 MAX16819 MAX16820 CSN DRV + DIM GND 1 2 3 TDFN 19-0706 Rev 4 2/17 IN VCC CSN DRV DIM GNDMAX16819/MAX16820 2MHz High-Brightness LED Drivers with High-Side Current Sense and 5000:1 Dimming Absolute Maximum Ratings IN, CSN, DIM to GND ...........................................-0.3V to +30V Operating Temperature Range ......................... -40C to +125C V , DRV to GND ..................................................-0.3V to +6V Junction Temperature ......................................................+150C CC CSN to IN .............................................................-0.3V to +0.3V Storage Temperature Range ............................ -65C to +150C Maximum Current into Any Pin Lead Temperature (soldering, 10s) .................................+300C (except IN, V , and DRV) ..........................................20mA Pin-to-Pin ESD Ratings (HB Model)...................................2.5kV CC Continuous Power Dissipation (T = +70C) A 6-Pin TDFN (derate 18.17mW/C* above +70C) .....1454mW *As per JEDEC51 Standard (Single-Layer Board). 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 = 12V, V = V , C = 1F, R = 0.5, T = T = -40C to +125C, unless otherwise noted. Typical values are at IN DIM IN VCC SENSE A J T = +25C.) (Note 1) A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Input Voltage Range V 4.5 28.0 V IN Maximum Current Regulator f 2 MHz SW Switching Frequency Ground Current I DRV open 1.5 mA GND Supply Current I V < 0.6V 425 A IN DIM V = V = V , V rising from 4V until IN CSN DIM IN 4.7 5.0 V > V - 0.5V DRV CC Undervoltage Lockout UVLO V V = V = V , V falling from 6V, IN CSN DIM IN 4.5 V < 0.5V DRV Undervoltage Lockout Hysteresis 0.5 V SENSE COMPARATOR (V - V ) rising from 0V until V < IN CSN DRV 195 210 225 0.5V (MAX16820) Sense Voltage Threshold High V mV SNSHI (V - V ) rising from 0V until V < IN CSN DRV 213 230 246 0.5V (MAX16819) (V - V ) falling from 0.26V until V > IN CSN DRV 176 190 204 (V - 0.5V) (MAX16820) CC Sense Voltage Threshold Low V mV SNSLO (V - V ) falling from 0.26V until V > IN CSN DRV 158 170 182 (V - 0.5V) (MAX16819) CC Falling edge of (V - V ) from 0.26V to IN CSN Propagation Delay to Output High t 82 ns DPDH 0V to DRV high, C = 1nF DRV Rising edge of (V - V ) from 0V to IN CSN Propagation Delay to Output Low t 82 ns DPDL 0.26V to DRV low, C = 1nF DRV Current-Sense Input Current I (V - V ) = 200mV 1 A CSN IN CSN MAX16819 56 70 mV Current-Sense Threshold CS HYS Hysteresis MAX16820 17 35 mV Maxim Integrated 2 www.maximintegrated.com