MIC24085 Datasheet, PDF (1/16 Pages) Micrel Semiconductor – Integrated FET Buck Regulator

MIC24085
18V, 3A, 1MHz, High-Performance,
Integrated FET Buck Regulator
in Tiny 3mm × 3mm QFN
General Description
Micrel’s MIC24085 is a constant-frequency, current-mode
PWM buck regulator with integrated switchers. The
MIC24085 is targeted for cost-sensitive and high-
performance applications.
The MIC24085 operates over a supply range of 4.5V to
18V at a fixed 1MHz switching frequency and can be used
to provide up to 3A of output current. The output voltage is
adjustable down to 0.9V.
The MIC24085 provides the features of low standby
current at 10µA, device enable, input undervoltage lockout,
and output voltage monitoring. The part also provides fault
protections of overcurrent and overtemperature.
The MIC24085 is available in a 16-pin 3mm × 3mm QFN
package with a junction operating range from –40°C to
+125°C.
Datasheets and support documentation are available on
Micrel’s web site at: www.micrel.com.
Features
• Input voltage range 4.5V to 18V
• 3A output current
• 1MHz switching frequency
• 0.9V reference voltage with ±1.5% accuracy
• Fixed output voltages are available at:
1.5V/1.8V/2.5V/3.3V/5V
• Peak current-mode PWM with internal compensation
• PFM mode for light load efficiency
• 10µA typical shutdown current
• 4ms internal soft start
• Cycle-by-cycle current limit with frequency foldback
• Output overvoltage protection
• Enable input/power-good (PG) output
• Thermal-shutdown protection
• –40°C to +125°C junction temperature range
• Available in 16-pin 3mm × 3mm QFN package
Applications
• Camera, set-top box, gateways, and routers
• Networking/telecom infrastructure
• Printers, scanners, graphic cards, and video cards
Typical Applications
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel [phone] • fax + 1 [phone] • http://www.micrel.com
October 22, 2013
Revision 1.1