ZLED7002 Toggle (Side-Step) Dual-Channel LED Driver Brief Description The ZLED7002 toggle (side-step) dual-channel LED driver is one of our ZLED family of LED control ICs. It operates in the lower DC voltage supply range of 2.7V to 5.5V. This unique LED driver is capable of controlling a MAIN channel and a SUB channel. Typically, only one of the two channels is active and the ZLED7002 toggles between the channels automatically in response to the voltage supply level and the related voltage at the UV (under-voltage protection) pin. A high-to-low transition of the power supply causes the output current to switch from the MAIN channel to the SUB channel if the UV pin voltage (VUV-PIN) is below the ZLED7002’s under-voltage threshold (VUVTHRSH=1.17V, typical). A low-to-high transition switches the output current from the SUB channel to the MAIN channel if the UV pin voltage is 80mV (typical) above the under-voltage threshold. The MAIN channel is a configurable constant current source driving the MAIN LED string with a maximum current draw of 250mA. The MAIN LED channel current is set by an external resistor (R3) connected to the Iset pin. Alternately, the SUB channel is activated when the ZLED7002’s SUB pin is pulled to ground. Its current is determined by the forward voltage of the SUB LED and external components. The SUB channel can drive up to 100mA current through the LED channel when active. The ZLED7002 enables voltage-level indicator applications and low-power battery-driven lighting applications that require switching to a lower-current LED channel when the supply is low, which extends the lighting lifetime. Because the dropout voltage (VDP) is minimal (as low as 0.1V when the MAIN channel output current is ~200mA), the ZLED7002 is optimal for battery-powered applications. Capable of operating efficiently with DC voltage supplies ranging from 2.7V to 5.5V, it is ideal for small portable lighting applications. The ZLED7002 can also reduce bill-of-material costs because very few external components are required for most applications, making it an optimal fit for small devices for which lighting lifetime is critical. Only four resistors, a diode, and a capacitor are needed for a typical basic application. Features • Automatic MAIN channel short-circuit protection switches the output current to the SUB channel if the MAIN LED is shorted • Under-voltage power supply detection • Over-temperature protection Benefits • Extends lighting life-time by switching to a lowercurrent LED channel when the supply is low • 80mV (typical) hysteresis prevents unintended switching activation due to power supply ripple • Ultra low quiescent current: 250µA typical • Very few external components needed for operation Available Support • Evaluation Kit Physical Characteristics • Voltage supply: 2.7V to 5.5V DC • Operating temperature: -25°C to 85°C • Small SOP8 package For additional information on our ZLED driver family, visit www.zmdi.com/products/led-drivers/ ZLED7002 Typical Application Circuit © 2011 Zentrum Mikroelektronik Dresden AG — Rev. 3.0 All rights reserved. The material contained herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner. The information furnished in this publication is subject to changes without notice. ZLED7002 Toggle (Side-Step) Dual-Channel LED Driver SOP8 Package Dimensions and Pin Assignments Symbol Dimension (mm, except θ) Min Max A 1.350 1.750 A1 0.100 0.250 A2 1.450 Typical Typical Applications Battery-driven LED lighting including • • • • Helmet lighting Bicycle lighting Miner lamps Pocket lights b 0.350 0.490 c 0.178 0.250 Voltage-level indicators D 4.800 5.000 General purpose low-voltage industrial and consumer LED applications E 3.800 4.000 E1 5.800 6.240 e 1.270 Typical L 0.400 1.270 θ 0° 8° Ordering Information Product Sales Code Description ZLED7002-ZI1R Package ZLED7002 – Toggle (Side-Step) Dual-Channel LED Driver SOP8 (Tape & Reel) ZLED7002KIT-E1 ZLED7002 Evaluation Kit Kit Sales and Further Information www.zmdi.com Zentrum Mikroelektronik Dresden AG (ZMD AG) Zentrum Mikroelektronik Dresden AG, Japan Office ZMD America, Inc. Grenzstrasse 28 01109 Dresden Germany 8413 Excelsior Drive Suite 200 Madison, WI 53717 USA Phone +49 (0)351.8822.7.533 Fax +49 (0)351.8822.8.7533 Phone Fax +1 (608) 829-1987 +1 (631) 549-2882 2nd Floor, Shinbashi Tokyu Bldg. 4-21-3, Shinbashi, Minato-ku Tokyo, 105-0004 Japan Phone +81.3.6895.7410 Fax +81.3.6895.7301 [email protected] ZMD FAR EAST, Ltd. 3F, No. 51, Sec. 2, Keelung Road 11052 Taipei Taiwan Phone +886.2.2377.8189 Fax +886.2.2377.8199 DISCLAIMER: This information applies to a product under development. Its characteristics and specifications are subject to change without notice. Zentrum Mikroelektronik Dresden AG (ZMD AG) assumes no obligation regarding future manufacture unless otherwise agreed to in writing. The information furnished hereby is believed to be true and accurate. However, under no circumstances shall ZMD AG be liable to any customer, licensee, or any other third party for any special, indirect, incidental, or consequential damages of any kind or nature whatsoever arising out of or in any way related to the furnishing, performance, or use of this technical data. ZMD AG hereby expressly disclaims any liability of ZMD AG to any customer, licensee or any other third party, and any such customer, licensee and any other third party hereby waives any liability of ZMD AG for any damages in connection with or arising out of the furnishing, performance or use of this technical data, whether based on contract, warranty, tort (including negligence), strict liability, or otherwise. © 2011 Zentrum Mikroelektronik Dresden AG — Rev. 3.0 All rights reserved. The material contained herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner.