AL8812FDF-13 Diodes Incorporated

AL8812 BOOST/BUCK DC-DC CONVERTER FOR DIMMABLE MR16 LED LAMPS Description Pin Assignments The AL8812 is a monolithic control circuit containing the primary functions required for DC-to-DC converters with MOSFET in one NC 1 12 DRAIN package. These devices consist of an internal temperature 2 11 SOURCE compensated reference, comparator, controlled duty cycle oscillator GATE with an active current limit circuit, driver and high current output INPUT 3 10 TIMING switch. Additionally a 60V, 3.6A MOSFET is integrated for reduced BOM cost and size. This series is specifically designed for buck and 4 9 GND VCC boost applications with a minimum number of external components. SENSE 5 8 SW/E 7 SW/C DRIVE 6 U-DFN6040-12 Features Applications Low Voltage LED Lighting such as MR-16 Operation from 3.0V to 20V Input General Purpose DC-DC Converter Integrated 60V, 3.6A MOSFET Low Standby Current Current Limiting Output Voltage Adjustable Frequency Operation to 100 kHz Precision 2% Reference Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2) Halogen and Antimony Free. Green Device (Note 3) Notes: 1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant. 2. See AL8812 Pin Descriptions Pin Pin Number Function Name (U-DFN6040-12) NC 1 No Connection GATE 2 Gate connection of internal MOSFET. INPUT 3 Feedback pin for inverting input of internal comparator VCC 4 Supply voltage pin SENSE 5 No Connection. Current drive collector: DRIVE 6 Normally connected to V directly or via a resistor. CC SW/C 7 Internal switch transistor collector SW/E 8 Internal switch transistor emitter GND 9 Ground Connection TIMING 10 Timing Capacitor to control the switching frequency. SOURCE 11 Source connecton of internal MOSFET DRAIN 12 Drain connection of internal MOSFET Exposed PAD1 Exposed Pad of MOSFET Drain Exposed PAD2 Exposed Pad of AL8812 and connect to PCB ground Functional Diagram 6 7 DRIVE SW/C S Q Q2 Q1 R 100 8 5 SENSE SW/E Ipk Oscillator CT 10 4 Comparator TIMING VCC 1.25V + Reference Regulator 3 9 INPUT GND 12 DRAIN 2 GATE 11 SOURCE 2 of 11 March 2014 AL8812 Diodes Incorporated www.diodes.com Document number: DS37099 Rev. 1 - 2