MIC2230_10 Datasheet, PDF (1/18 Pages) Micrel Semiconductor – Dual Synchronous 800mA/800mA Step-Down DC/DC Regulator

MIC2230
Dual Synchronous 800mA/800mA
Step-Down DC/DC Regulator
General Description
Features
The MIC2230 is dual output, high-efficiency synchronous
step-down DC/DC converter. The MIC2230 is ideally
suited for portable systems which demand high power
conversion efficiencies and fast transient performance,
while offered in a very small package. The MIC2230 offers
an ultra-low quiescent current in light load mode assuring
minimum current draw from battery powered applications
in standby modes. The MIC2230 was designed to only
require miniature 2.2µH inductors and 10µF ceramic
capacitors.
The MIC2230 features a selectable mode that allows the
user to trade-off lowest noise performance for low power
efficiency. Trickle Mode^TM operation provides ultra-high
efficiency at light loads, while PWM operation provides
very low ripple noise performance. To maximize battery life
in low-dropout conditions, MIC2230 can operate with a
maximum duty cycle of 100%.
The MIC2230 is available in a space-saving 3mm × 3mm
MLF^®-12L package with a junction temperature range from
–40°C to +125°C.
• High Efficiency: Over 96%
• Ultra-low quiescent current: Only 28µA
• Ultra-low shutdown current less than 1µA
• Fast transient performance
• 2.5MHz PWM operation
• High output current capability per channel: 800mA
• No Schottky Diodes Required
• Stable with 2.2µH inductor, 10µF ceramic capacitor
• Adjustable output voltage down to 0.8V
• Built-in soft-start circuitry
• Current limit protection
• Automatic switching into light load mode operation
• /FPWM pin allows low noise all-PWM mode operation
• Power good output with internal 5µA current source
allows sequencing with programmable delay time
• Small Thermally Enhanced 3mm × 3mm MLF^® package
Applications
Data sheets and support documentation can be found on
Micrel’s web site at www.micrel.com.
• Cellular phones
• PDAs
• Digital Cameras
• MP3 Players
• PC Cards
• Wireless and DSL Modems
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Typical Application
MLF and MicroLead Frame are registered trademarks of Amkor Technology, Inc.
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel [phone] • fax + 1 [phone] • http://www.micrel.com
April 2010
M9999-040810-C