MIC2292/93 Micrel, Inc. MIC2292/93 High Frequency PWM White LED Drivers with Internal Schottky Diode and OVP General Description Features The MIC2292 and MIC2293 are high frequency, Pulse Width 2.5V to 10V input voltage Modulator (PWM) boost regulators optimized for constant- Output voltage up to 34V current, white LED driver applications. Because of their Internal Schottky diode constant PWM switching frequencies of 1.6MHz and 2MHz, 1.6MHz PWM operation (MIC2292) respectively, the MIC2292/93 can use the smallest external 2.0MHz PWM operation (MIC2293) components, allowing designers to avoid sensitive IF bands Stable with ceramic capacitors in their RF applications. 15V and 34V output overvoltage protection options The products feature an internal Schottky diode and two 500mA switch current rating levels of output overvoltage protection allowing a small size 95mV feedback voltage and efficient DC/DC solution that requires only four external <1% line and load regulation components. <1A shutdown current Over-temperature protection The 2.5V to 10V input voltage range of MIC2292/3 UVLO allows direct operation from 1- and 2-cell Li Ion as well as 8-lead (2mm 2mm) MLF package 3- to 4-cell NiCad/NiMH/Alkaline batteries. The MIC2292/3 40C to +125C junction temperature range products are available in a small size 2mm 2mm 8-lead MLF package and have a junction temperature range of 40C to +125C. Applications All support documentation can be found on Micrels web site White LED driver for backlighting at www: micrel.com. Cell phones PDAs GPS systems Digital cameras MP3 players IP phones Constant current power supplies Typical Application 15H 10H MIC2292-15YML MIC2293-15YML VIN SW VIN SW 1F 1F 0.22F 0.22F Li Ion Li Ion OUT OUT 16V 16V 95mV 95mV EN FB EN FB GND GND 6.3 6.3 1.6MHz PWM White LED Driver with 15V OVP 2MHz PWM White LED Driver with 15V OVP MLF and MicroLeadFrame are registered trademarks of Amkor Technology, Inc. Micrel, Inc. 2180 Fortune Drive San Jose, CA 95131 USA tel + 1 (408) 944-0800 fax + 1 (408) 474-1000 MIC2292/93 Micrel, Inc. Ordering Information Marking Overvoltage Junction Part Number Code Protection Frequency Temp. Range Package Lead Finish MIC2292-15BML SWA 15V 1.6MHz 40C to +125C 8-lead MLF Standard MIC2292-15YML SWA 15V 1.6MHz 40C to +125C 8-lead MLF Pb-Free MIC2292-34BML SWC 34V 1.6MHz 40C to +125C 8-lead MLF Standard MIC2292-34YML SWC 34V 1.6MHz 40C to +125C 8-lead MLF Pb-Free MIC2293-15BML SZA 15V 2MHz 40C to +125C 8-lead MLF Standard MIC2293-15YML SZA 15V 2MHz 40C to +125C 8-lead MLF Pb-Free MIC2293-34BML SZC 34V 2MHz 40C to +125C 8-lead MLF Standard MIC2293-34YML SZC 34V 2MHz 40C to +125C 8-lead MLF Pb-Free Pin Configuration OUT 1 8 PGND VIN 2 7 SW EN 3 6 FB AGND 4 EP 5 NC 8-lead MLF (YML) (Top View) Fused Lead Frame Pin Description Pin Number Pin Name Pin Function 1 OUT Output pin and overvoltage protection (Output): Connect to the output ca- pacitor and LEDs. 2 VIN Supply (Input): Input voltage. 3 EN Enable (Input): Logic high enables regulator. Logic low shuts down regula- tor. 5 NC No connect (no internal connection to die). 6 FB Feedback (Input): Output voltage sense node. Connect the cathode of the LED to this pin. A resistor from this pin to ground sets the LED current. 7 SW Switch node (Input): Internal power transistor collector. 4,8 GND Ground (Return): Ground. EP GND Ground (Return): Exposed backside pad. M9999-070809 2 July, 2009