MIC2238 Datasheet, PDF (1/16 Pages) Micrel Semiconductor – Dual Synchronous 800mA/800mA Step-Down DC/DC Regulator

MIC2238
Dual Synchronous 800mA/800mA
Step-Down DC/DC Regulator
General Description
Features
The MIC2238 is dual output, High-efficiency synchronous
step-down DC/DC converter. The MIC2238 is ideally
suited for portable systems which demand high power
conversion efficiencies while offered in a very small
package. The MIC2238 offers an ultra-low quiescent
current in light load mode assuring minimum current draw
from battery powered applications in standby modes. The
MIC2238 was designed for use of miniature 2.2µH
inductors and 2.2µF ceramic capacitors.
The MIC2238 features a selectable mode that allows the
user to trade-off lowest noise performance for low power
efficiency. Trickle mode 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, MIC2238 can operate with a
maximum duty cycle of 100%.
The MIC2238 is available in a space-saving 3mm × 3mm
MLF^®-12L package with a junction temperature range from
–40°C to +125°C.
• High Efficiency: Up to 95%
• Ultra-low quiescent current: Only 28µA
• Ultra-low shutdown current less than 1µA
• 2.5MHz PWM operation
• High output current capability per channel: 800mA
• No Schottky Diodes Required
• Stable with 2.2µH inductor, 2.2µF 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 Technologies
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel [phone] • fax + 1 [phone] • http://www.micrel.com
July 2007
M9999-071307