MIC2293-34YML-TR Microchip

MIC2292/93C High Frequency PWM White LED Drivers with Internal Schottky Diode and OVP General Description Features The MIC2292C and MIC2293C are high frequency, Pulse 2.5V to 10V input voltage Width Modulator (PWM) boost regulators optimized for Output voltage up to 34V constant-current, white LED driver applications. Because Internal Schottky diode of their constant PWM switching frequencies of 1.6MHz 1.6MHz PWM operation (MIC2292C) and 2MHz, respectively, the MIC2292/93C can use the smallest external components, allowing designers to avoid 2.0MHz PWM operation (MIC2293C) sensitive IF bands in their RF applications. Stable with ceramic capacitors The products feature an internal Schottky diode and two 15V and 34V output overvoltage protection options levels of output overvoltage protection allowing a small 500mA switch current rating size and efficient DC/DC solution that requires only four 95mV feedback voltage external components. <1% line and load regulation The 2.5V to 10V input voltage range of MIC2292/3C allows <1A shutdown current direct operation from 1- and 2-cell Li Ion as well as 3- to 4- cell NiCad/NiMH/Alkaline batteries. The MIC2292/3C pro- Over-temperature protection ducts are available in a small size 8-pin 2mm 2mm MLF UVLO package and have a junction temperature range of 8-pin 2mm 2mm MLF package 40C to +125C. 40C to +125C junction temperature range Data sheets and support documentation can be found on Micrels web site at www.micrel.com. Applications White LED driver for backlighting: Cell phones PDAs GPS systems Digital cameras MP3 players IP phones Constant current power supplies Typical Application 15H 10H MIC2292C-15YML MIC2293C-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 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 Micrel, Inc. MIC2292/93C Ordering Information Marking Overoltage Junction Part Number Code Protection Temp. Range Package Lead Finish MIC2292C-15YML 15V 40C to +125C 8-Pin 2mm x 2mm MLF Pb-Free MIC2293C-34YML 34V 40C to +125C 8-Pin 2mm x 2mm MLF Pb-Free Notes 1: Contact Micrel Marketing for other voltage options. Pin Configuration Denotes Pb-Free OUT 1 8 PGND VIN 2 SW 7 EN 3 6 FB AGND 4 EP 5 NC Denotes MIC2292/93C 8-Pin MLF (ML) (Top View) Fused Lead Frame Pin Description Pin Number Pin Name Pin Name 1 OUT Output Pin and Overvoltage Protection (Output): Connect to the output capacitor and LEDs. 2 VIN Supply (Input): Input Voltage. 3 EN Enable (Input): Logic high enables regulator. Logic low shuts down regulator. 4 AGND Analog ground. 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. 8 PGND Power ground. EP GND Ground (Return): Exposed backside pad. M9999-091509-A September 2009 2