MIC2290YML-TR Microchip

MIC2290 2mm 2mm PWM Boost Regulator with Internal Schotty Diode General Description Features The MIC2290 is a 1.2MHz, PWM, boost-switching Internal Schottky diode regulator housed in the small size 2mm 2mm 8-pin MLF 2.5V to 10V input voltage package. The MIC2290 features an internal Schottky diode Output voltage adjustable to 34V that reduces circuit board area and total solution cost. High Over 500mA switch current power density is achieved with the MIC2290s internal 34V/0.5A switch, allowing it to power large loads in a tiny 1.2MHz PWM operation footprint. Stable with ceramic capacitors The MIC2290 implements a constant frequency 1.2MHz <1% line and load regulation PWM control scheme. The high frequency operation saves Low input and output ripple board space by reducing external component sizes. The <1A shutdown current fixed frequency PWM topology also reduces switching UVLO noise and ripple to the input power source. Output overvoltage protection The MIC2290s wide 2.5V to 10V input voltage allows direct operation from 3- to 4-cell NiCad/NiMH/Alkaline Over temperature protection batteries, 1-and 2-cell Li-Ion batteries, as well as fixed 2mm 2mm 8-pin MLF package 3.3V and 5V systems. 40C to +125C junction temperature range The MIC2290 is available in a low-profile 2mm2mm 8-pin MLF leadless package and operates from a junction Applications temperature range of 40C to +125C. Data sheets and support documentation can be found on Organic EL power supply Micrels web site at: www.micrel.com. TFT LCD bias supply 12V DSL power supply CCD bias supply SEPIC converters Typical Application L1 V OUT 12V Efficiency OUT V 10H IN 12V 85 V =4.2V IN 80 MIC2290 2 7 V =3.2V VIN SW IN 75 R1 3 1 Li Ion EN OUT Battery V =3.6V IN C1 6 C2 70 FB 1F 10F GND 4, 8 R2 65 60 0 0.02 0.04 0.06 0.08 0.1 LOAD CURRENT (A) Simple 12V Boost Regulator 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. MIC2290 Ordering Information Marking Output Overvoltage Junction Part Number Code Voltage Protection Temp. Range Package Lead Finish MIC2290BML SRC Adj. 34V 40 to +125C 8-Pin 2x2 MLF Standard MIC2290YML SRC Adj. 34V 40 to +125C 8-Pin 2x2 MLF Pb-Free Pin Configuration OUT 1 8 PGND VIN 2 SW 7 EN 3 6 FB AGND 4 5 NC 8-Pin 2mm x 2mm MLF (ML) (Top View) Pin Description Pin Number Pin Name Pin Function 1 OUT Output pin (Output): Output voltage. Connect to FB resistor divider. This pin has an internal 34V output overvoltage clamp. See Block Diagram and Applications section for more information. 2 VIN Supply (Input): 2.5V to 10V 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 feedback resistor R1 network to this pin. V = 1.24V 1 + . OUT R2 7 SW Switch node (Input): Internal power Bipolar collector. 8 PGND Power ground. EP GND Ground (Return): Exposed backside pad. M9999-101907 October 2007 2