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PDF MIC33050 Data sheet ( Hoja de datos )
| Número de pieza | MIC33050 | |
| Descripción | 4MHz Internal Inductor PWM Buck Regulator | |
| Fabricantes | Micrel Semiconductor | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de MIC33050 (archivo pdf) en la parte inferior de esta página. Total 16 Páginas | ||
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MIC33050
4MHz Internal Inductor PWM Buck
Regulator with HyperLight Load®
General Description
Features
The Micrel MIC33050 is a high-efficiency 600mA PWM
synchronous buck (step-down) regulator with internal
inductor featuring HyperLight Load, 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 of 20µA and can achieve over 85% efficiency even
at 1mA.
In contrast to traditional light load schemes, the HyperLight
Load architecture does 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%.
The MIC33050 is available in fixed and adjustable output
voltages and comes in a 12-pin 3mm x 3mm MLF® with a
junction operating range of –40C to +125C.
Data sheets and support documentation can be found on
Micrel’s web site at: www.micrel.com.
Input voltage: 2.7V to 5.5V
600mA output current
Fixed and adjustable output voltage options
No external inductor required
Ultra-fast transient response
20µA quiescent current
4MHz switching in PWM mode
Low output voltage ripple
>93% peak efficiency
>85% efficiency at 1mA
Micropower shutdown
12-pin 3mm x 3mm MLF®
–40C to +125C junction temperature range
Applications
Cellular phones
Digital cameras
Portable media players
Wireless LAN cards
WiFi, WiMax, and WiBro modules
USB-powered devices
____________________________________________________________________________________________________________
Typical Application
HyperLight Load is a registered 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
May 2012
M9999-050312-C
1 page  
Micrel, Inc.
Typical Characteristics (Continued)
Output Voltage vs. Temperature
1.9
1.85
1.8
1.75
VIN = 3.6V
VOUT = 1.8V
No Load
1.7
-40 -20
0 20 40 60 80 100 120
TEMPERATURE (°C)
Output Voltage vs. Input
Voltage (V)
1.9
1.85
1.8
1.75
1.7
2.7
Load = 20mA
3.2 3.7 4.2 4.7
INPUT VOLTAGE (V)
5.2
MIC33050
Output Voltage
vs. Output Current
1.90
1.85
1.80
1.75
1.700
VIN = 3.6V
100 200 300 400 500 600
OUTPUT CURRENT (mA)
May 2012
5 M9999-050312-C
5 Page 
Micrel, Inc.
HyperLight Load Mode
The MIC33050 uses a minimum on and off time
proprietary control loop. When the output voltage falls
below the regulation threshold, the error comparator
begins a switching cycle that turns the PMOS on and
keeps it on for the duration of the minimum-on-time. When
the output voltage is over the regulation threshold, the
error comparator turns the PMOS off for a minimum-off-
time. The NMOS acts as an ideal rectifier that conducts
when the PMOS is off. Using a NMOS switch instead of a
diode allows for lower voltage drop across the switching
device when it is on. The asynchronous switching
combination between the PMOS and the NMOS allows the
control loop to work in discontinuous mode for light load
operations. In discontinuous mode, MIC33050 works in
pulse frequency modulation (PFM) to regulate the output.
As the output current increases, the switching frequency
increases. This improves the efficiency of the MIC33050
during light load currents. As the load current increases,
the MIC33050 goes into continuous conduction mode
(CCM) at a constant frequency of 4MHz. The equation to
calculate the load when the MIC33050 goes into
continuous conduction mode may be approximated by the
following formula:
ILOAD
(VIN
VOUT )
2L f
D
MIC33050
May 2012
11 M9999-050312-C
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet MIC33050.PDF ] | |
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