MAX16801A/B/MAX16802A/B 19-3880 Rev 2 1/10 Offline and DC-DC PWM Controllers for High-Brightness LED Drivers General Description Features The MAX16801A/B/MAX16802A/B high-brightness (HB) Suitable for Buck, Boost, Flyback, SEPIC, and LED driver-control ICs contain all the circuitry required Other Topologies for the design of wide-input-voltage-range LED drivers Up to 50W or Higher Output Power for general lighting and display applications. The Universal Offline Input Voltage Range: Rectified MAX16801 is well suited for universal input (rectified 85VAC to 265VAC (MAX16801) 85VAC to 265VAC) LED drivers, while the MAX16802 is intended for low-input-voltage (10.8VDC to 24VDC) LED IN Pin Directly Driven From 10.8VDC to 24VDC drivers. Input (MAX16802) When the LED current needs to be tightly regulated, an Internal Error Amplifier with 1% Accurate additional on-board error amplifier with 1% accurate ref- Reference for Precise LED Current Regulation erence can be utilized. A wide dimming range can be PWM or Linear Dimming implemented by using low-frequency PWM dimming. Fixed Switching Frequency of 262kHz 12% The MAX16801/MAX16802 feature an input undervoltage Thermal Shutdown lockout (UVLO) for programming the input-supply start voltage, and to ensure proper operation during brownout Digital Soft-Start conditions. The MAX16801 has an internal-bootstrap Programmable Input Startup Voltage undervoltage lockout circuit with a large hysteresis that Internal Bootstrap UVLO with Large Hysteresis simplifies offline LED driver designs. The MAX16802 does (MAX16801) not have this internal bootstrap circuit and can be biased directly from a +12V rail. 45A (typ) Startup Supply Current, 1.4mA (typ) Operating Supply Current The 262kHz fixed switching frequency is internally trimmed, allowing for optimization of the magnetic and fil- 50% (MAX16801A/MAX16802A) or 75% ter components, resulting in a compact, cost-effective (MAX16801B/MAX16802B) Maximum Duty Cycle LED driver. The MAX16801A/MAX16802A are offered with Available in a Tiny 8-Pin MAX Package 50% maximum duty cycle.The MAX16801B/MAX16802B are offered with 75% maximum duty cycle. These devices Ordering Information are available in an 8-pin MAX package and operate over the -40C to +85C temperature range. TEMP PIN- PART RANGE PACKAGE Applications MAX16801AEUA+ -40C to +85C 8 MAX Offline and DC-DC LED Commercial and MAX16801BEUA+ -40C to +85C 8 MAX Drivers Industrial Lighting MAX16802AEUA+ -40C to +85C 8 MAX RGB Back Light for LCD Decorative and MAX16802BEUA+ -40C to +85C 8 MAX TVs and Monitors Architectural Lighting +Denotes lead-free package. MAX is a registered trademark of Maxim Integrated Products, Inc. Typical Operating Circuit 10.8VDC TO 24VDC ENABLE UVLO/EN IN LEDs C3 L1 DIM/FB V CC D1 PWM MAX16802B Q1 NDRV COMP CS GND C1 C2 R1 GND Warning: The MAX16801/MAX16802 are designed to work with high voltages. Exercise caution. 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 AVAILABLEOffline and DC-DC PWM Controllers for High-Brightness LED Drivers ABSOLUTE MAXIMUM RATINGS IN to GND Operating Temperature Range ...........................-40C to +85C ..........................................................................-0.3V to +30V V to GND Storage Temperature Range ............................-65C to +150C CC ......................................................................-0.3V to +13V DIM/FB, COMP, UVLO, CS to GND..........................-0.3V to +6V Junction Temperature......................................................+150C NDRV to GND.............................................-0.3V to (V + 0.3V) Lead Temperature (soldering, 10s) .................................+300C CC Continuous Power Dissipation (T = +70C) A 8-Pin MAX (derate 4.5mW/C above +70C) ..............362mW 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 (MAX16801: V must first be brought up to +23.6V for startup), 10nF bypass capacitors at IN and V , C = 0F, IN IN CC NDRV V = +1.4V, V = +1.0V, COMP = unconnected, V = 0V, T = -40C to +85C, unless otherwise noted. Typical values are UVLO DIM/FB CS A at T = +25C.) (Note 1) A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS UNDERVOLTAGE LOCKOUT/STARTUP Bootstrap UVLO Wake-Up Level V V rising (MAX16801 only) 19.68 21.6 23.60 V SUVR IN Bootstrap UVLO Shutdown Level V V falling (MAX16801 only) 9.05 9.74 10.43 V SUVF IN UVLO/EN Wake-Up Threshold V UVLO/EN rising 1.188 1.28 1.371 V ULR2 UVLO/EN Shutdown Threshold V UVLO/EN falling 1.168 1.23 1.291 V ULF2 UVLO/EN Input Current I T = +125C 25 nA UVLO J UVLO/EN Hysteresis 50 mV IN Supply Current In V = +19V, for MAX16801 only when in IN I 45 90 A START Undervoltage Lockout bootstrap UVLO IN Voltage Range V 10.8 24 V IN t UVLO/EN steps up from +1.1V to +1.4V 12 EXTR UVLO/EN Propagation Delay s t UVLO/EN steps down from +1.4V to +1.1V 1.8 EXTF t V steps up from +9V to +24V 5 Bootstrap UVLO Propagation BUVR IN s Delay t V steps down from +24V to +9V 1 BUVF IN INTERNAL SUPPLY V = +10.8V to +24V, sinking 1A to 20mA IN V Regulator Set Point V 7 10.5 V CC CCSP from V CC IN Supply Current After Startup I V = +24V 1.4 2.5 mA IN IN Shutdown Supply Current UVLO/EN = low 90 A GATE DRIVER R Measured at NDRV sinking, 100mA 2 4 ON(LOW) Driver Output Impedance R Measured at NDRV sourcing, 20mA 4 12 ON(HIGH) Driver Peak Sink Current 1A Driver Peak Source Current 0.65 A PWM COMPARATOR Comparator Offset Voltage VO V - V 1.15 1.38 1.70 V PWM COMP CS CS Input Bias Current I V = 0V -2 +2 A CS CS Comparator Propagation Delay t V = +0.1V 60 ns PWM CS Minimum On-Time t 150 ns ON(MIN) 2 MAX16801A/B/MAX16802A/B