MIC2860_D Datasheet, PDF (1/12 Pages) Micrel Semiconductor – High Efficiency 2 Channel WLED Driver with Single Wire Digital Control

MIC2860-D
High Efficiency 2 Channel WLED Driver
with Single Wire Digital Control
General Description
The MIC2860-2D is a high efficiency White LED (WLED)
driver designed to drive two WLEDs and greatly extend
battery life for portable display backlighting, and keypad
backlighting in low cost mobile devices. The MIC2860-2D
architecture provides the highest possible efficiency by
eliminating switching losses present in traditional charge
pumps or inductive boost circuits. It features a typical
dropout of 52mV at 30.2mA per channel. This allows the
WLEDs to be driven directly from the battery eliminating
switching noise and losses present with the use of boost
circuitry.
The two channels have better than ±0.5% matching, which
ensures uniform display illumination under all conditions.
The WLEDs brightness is externally preset by a resistor
and dimmed using a single wire digital control signal. The
MIC2860-2D single wire digital interface accepts digital
programming pulses providing 32 dimming steps.
The MIC2860-2D is available in Thin SOT-23 and SC-70
six pin packages with a junction temperature range of
-40°C to +125°C.
Datasheets and support documentation can be found on
Micrel’s web site at: www.micrel.com.
Features
• High Efficiency (no switching losses)
• No charge pumps
• 2 WLED driver channels
• Single wire digital control
• Input voltage range: 3.0V to 5.5V
• WLED driver dropout of 52mV at 30.2mA
• Matching better than ±0.5% (typical)
• Current Accuracy better than ±1.0% (typical)
• Available in Thin SOT-23 and SC-70 6 pin packages
Applications
• Mobile handsets
• Digital cameras
• Portable media/MP3 players
• Portable navigation devices (GPS)
• Portable applications
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Typical Application
LCD Display Backlight with 2 WLEDs
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel [phone] • fax + 1 [phone] • http://www.micrel.com
July 2010
M9999-072010-A