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MIC33050_09 Datasheet, PDF (1/13 Pages) Micrel Semiconductor – 4MHz Internal Inductor PWM Buck Regulator with HyperLight Load | |||
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MIC33050
4MHz Internal Inductor PWM Buck
Regulator with HyperLight Loadâ¢
General Description
Features
The Micrel MIC33050 is a high efficiency 600mA PWM
synchronous buck (step-down) regulator with internal
inductor featuring HyperLight Loadâ¢, a patent-pending
switching scheme that offers best-in-class light load
efficiency and transient performance while providing very
small external components and low output ripple at all
loads.
The MIC33050 also has a very low typical quiescent
current draw of 20µA and can achieve over 85% efficiency
even at 1mA.
In contrast to traditional light load schemes, the HyperLight
Load⢠architecture does need not trade off control speed
to obtain low standby currents and in doing so, the device
only needs a small output capacitor to absorb the load
transient as the powered device goes from light load to full
load.
At higher loads, the MIC33050 provides a constant
switching frequency of greater than 4MHz while providing
peak efficiencies greater than 93%.
⢠Input voltage: 2.7V to 5.5V
HyperLight Loadâ¢
⢠600mA output current
⢠Fixed output voltage options from 0.72V to 3.3V
⢠No external inductor required
⢠Ultra fast transient response
⢠20µA typical quiescent current
⢠4MHz in PWM in constant current mode
⢠Low voltage output ripple
â 25mVpp in HyperLight Load⢠mode
â 3mV output voltage ripple in full PWM mode
⢠>93% efficiency
⢠>85% at 1mA
⢠Micropower shutdown
⢠3mm x 3mm MLF®-12L
⢠â40°C to +125°C junction temperature range
Applications
The MIC33050 comes in fixed output voltage options from
0.72V to 3.3V thereby eliminating external feedback
components.
The MIC33050 is available in an 12-pin 3mm x 3mm MLF®
with a junction operating range of â40°C to +125°C.
Data sheets and support documentation can be found on
Micrelâs web site at: www.micrel.com.
⢠Cellular phones
⢠Digital cameras
⢠Portable media players
⢠Wireless LAN cards
⢠WiFi/WiMax/WiBro modules
⢠USB Powered Devices
____________________________________________________________________________________________________________
Typical Application
Efficiency V = 1.8V
OUT
100
90
V = 3.0V
IN
80
70 VIN = 3.6V
60
V = 4.2V
IN
501
10
100
1000
OUTPUT CURRENT (mA)
HyperLight Load is a trademark of Micrel, Inc.
MLF and MicroLeadFrame are registered trademarks of Amkor Technology, Inc.
Micrel Inc. ⢠2180 Fortune Drive ⢠San Jose, CA 95131 ⢠USA ⢠tel +1 (408) 944-0800 ⢠fax + 1 (408) 474-1000 ⢠http://www.micrel.com
July 2009
1
M9999-070909-C
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