MIC2282 Datasheet, PDF (1/10 Pages) Micrel Semiconductor – Single-Cell Ultra Low EMI Boost LED Driver

MIC2282
Single-Cell Ultra Low EMI
Boost LED Driver
General Description
Features
The MIC2282 is a boost LED driver optimized for single
cell operation from alkaline, nickel-metal-hydride, or lithium
ion batteries. The MIC2282 operates with an input voltage
between 0.9V to 15V, driving a string of series LEDs up to
33V. The combination of a low feedback voltage of 220mV
and an operating current of 120μA provides a high
efficiency solution that prolongs battery life.
• Operates from a single-cell supply (V_IN = 0.9V to 15V)
• Ultra Low EMI
• 120µA typical quiescent current
• Adjustable output voltages
• 220mV sense voltage
• 20kHz switching frequency
The MIC2282 requires only five external components
(diode, inductor, sense resistor, input capacitor and output
capacitor) to implement a low cost LED boost regulator. It
is available in a compact 8-pin MSOP package with an
operating range from –40°C to +125°.
• Over temperature protection
• 8-pin MSOP package
• Low component count solution
Data sheets and support documentation can be found on
Micrel’s web site at: www.micrel.com.
Applications
• LED flashlight and head lamps
• LCD bias generator
• Battery-powered, hand-held instruments
• Palmtop computers
• Remote controls
• Detectors
___________________________________________________________________________________________________________
Typical Application
L1
D1
220µH ^MBR0530
1V to1.5V
1 Cell
C1
47µF
16V
8
IN
SW ¹
MIC2282 _{SNS 6}
GND GND
7
2
SNS
V_OUT = 3V
100µF
1V to1.5V
1 Cell
C1
47µF
16V
L1
D1
220µH ^MBR0530
8
IN
SW ¹
MIC2282 _{SNS 6}
GND GND
7
2
SNS
V_OUT = 9V
100µF
Single-Cell to 3V DC-to-DC Converter
Triple-Cell to 9V DC-to-DC Converter
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel [phone] • fax + 1 [phone] • http://www.micrel.com
October 2009
M9999-102309