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PDF MIC23051 Data sheet ( Hoja de datos )
| Número de pieza | MIC23051 | |
| Descripción | 4MHz PWM Buck Regulator 4MHz PWM Buck Regulator and Voltage Scaling | |
| Fabricantes | Micrel Semiconductor | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de MIC23051 (archivo pdf) en la parte inferior de esta página. Total 13 Páginas | ||
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MIC23051
www.DataSheet4U.com
4MHz PWM Buck Regulator
with HYPER LIGHT LOAD™
and Voltage Scaling
General Description
Features
The Micrel MIC23051 is a high efficiency 500mA PWM
synchronous buck (step-down) regulator featuring Hyper
Light Load™, a patented 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 MIC23051 has an output voltage scaling feature that
can toggles between two different voltage levels.
The MIC23051 also has a very low typical quiescent
current draw of 20µA and can achieve over 85% efficiency
even at 1mA. The device allows operation with a tiny
inductor ranging from 0.47µH to 2.2µH and uses a small
output capacitor that enables a sub-1mm height.
In contrast to traditional light load schemes Hyper Light
Load™ architecture does not need to 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.
• Input voltage range: 2.7V to 5.5V
• Fixed output voltage options from 0.72V to 2.5V
• Output voltage scaling option
• Output current to 500mA
• Ultra fast transient response
• 20µA typical quiescent current
• 4MHz in CCM PWM operation in normal mode
• Hyper light load mode
• 0.47µH to 2.2µH inductor
• Low voltage output ripple
– 25mVpp in hyper light load mode
– 3mV output voltage ripple in full PWM mode
• >93% efficiency
• ~85% at 1mA
• Fully integrated MOSFET switches
• Micropower shutdown
• Thermal shutdown and current limit protection
• 8-pin 2mm x 2mm MLF®
At higher loads the MIC23051 provides a constant • –40°C to +125°C junction temperature range
switching frequency of greater than 4MHz while providing
peak efficiencies greater than 93%.
Applications
The MIC23051 comes in fixed output voltage options from
0.72V to 2.5V eliminating external feedback components.
The MIC23051 is available in an 8-pin 2mm x 2mm MLF®
with a junction operating range from –40°C to +125°C.
Data sheets and support documentation can be found on
Micrel’s 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 VOUT = 1.8V
100
VIN = 2.7V
80
VIN = 3.3V
VIN = 3.6V
60
40
20 VOUT = 1.8V
L = 1µH
01 10 100 1000
LOAD (mA)
Hyper Light Load is a trademark of Micrel, Inc.
MLF and MicroLeadFrame are registered trademarks of Amkor Technology, Inc.
Protected by US Patent No. 7064531
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
October 2007
M9999-101207-C
1 page  
Micrel, Inc.
Functional Characteristics
MIC23051
www.DataSheet4U.com
October 2007
5 M9999-101207-C
5 Page 
Micrel, Inc.
MIC23051 Typical Application Circuit (Fixed 1.8V)
MIC23051
www.DataSheet4U.com
Bill of Materials
Item
C1, C2
C3
L1
Part Number
C1608X5R0J476K
C1005X5R0J476K
LQM21PN1R0M00
LQH32CNR1R0M33
LQM31P1R0M00
GFL251812T
LQM31PNR47M00
MIPF2520D1R5
MIC23051-CGYML
U1
MIC23051-16YML
Notes:
1. TDK: www.tdk.com
2. Murata: www.murata.com
3. FDK: www.fdk.co.jp
4. Micrel, Inc: www.micrel.com
Manufacturer
TDK(1)
Murata(2)
Murata(2)
Murata(2)
Murata(2)
TDK(1)
Murata(2)
FDK(3)
Micrel, Inc. (4)
Description
4.7µF Ceramic Capacitor, 6.3V, X5R, Size 0603
560pF Ceramic Capacitor, 6.3V, X5R, Size 0402
1µH, 0.8A, 190mΩ, L2mm x W1.25mm x H0.5mm
1µH, 1A, 60mΩ, L3.2mm x W2.5mm x H2.0mm
1µH, 1.2A, 120mΩ, L3.2mm x W1.6mm x H0.95mm
1µH, 0.8A, 100mΩ, L2.5mm x W1.8mm x H1.35mm
0.47µH, 1.4A, 80mΩ, L3.2mm x W1.6mm x H0.85mm
1.5µH, 1.5A, 70mΩ, L2.5mm x W2mm x H1.0mm
4MHz PWM Buck Regulator with Hyper Light Load Mode
Qty
2
1
1
1
October 2007
11 M9999-101207-C
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet MIC23051.PDF ] | |
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