Microchip MIC23050 Manual

Microchip Ikke kategoriseret MIC23050

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MIC23050
4MHz PWM Buck Regulator with
HyperLight Load™ Switching Scheme
y, Inc. Protected by US Patent No. 7064531
l +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
HyperLight Load is a trademark of Micrel, Inc.
MLF and MicroLeadFrame are registered trademarks of Amkor Technolog
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • te
September 2011
General Description
The Micrel MIC23050 is a high-efficiency, 600mA, PWM,
synchronous buck (step-down) regulator featuring the
HyperLight Load™ 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 MIC23050 also has a very-low typical quiescent
current draw of 20µA and can achieve over 89% 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, the HyperLight
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.
At higher loads the MIC23050 provides a constant
switching frequency of greater than 4MHz while providing
peak efficiencies greater than 93%.
The MIC23050 comes in fixed output voltage options from
0.72V to 3.3V eliminating external feedback components.
The MIC23050 is available in an 8-pin 2mm x 2mm MLF ®
with a junction operating range from –40° °C to +125 C.
Datasheets and support documentation can be found on
Micrel’s web site at: www.micrel.com.
Features
• Input voltage: 2.7V to 5.5V HyperLight Load™
• 600mA output current
• Fixed output voltage from 0.72V to 3.3V
• Ultra-fast transient response
• 20µA typical quiescent current
• 4MHz in PWM in constant-current mode
• 0.47µH to 2.2µH inductor
• Low voltage output ripple
− 25mVPP in HyperLight Load™ mode
− 3mV output voltage ripple in full PWM mode
• >93% efficiency
• ~89% at 1mA
• Micropower shutdown
• Available in 8-pin 2mm x 2mm MLF®
• ° ° –40 C to +125 C junction temperature range
Applications
• Cellular phones
• Digital cameras
• Portable media players
• Wireless LAN cards
• WiFi/WiMax/WiBro modules
• USB-powered devices
____________________________________________________________________________________________________________
Typical Application
1 M9999-092211-E
Micrel, Inc. MIC23050
September 2011 2 M9999-092211-E
Ordering Information
Part Number Marking Nominal Output
Voltage(1) Junction Temperature Range Package(2) Lead Finish
MIC23050-CYML GKC 1.0V –40° to +125°C 8-Pin 2x2 MLF® Pb-Free
MIC23050-4YML GK4 1.2V –40° to +125°C 8-Pin 2x2 MLF® Pb-Free
MIC23050-GYML GKG 1.8V –40° to +125°C 8-Pin 2x2 MLF
® Pb-Free
MIC23050-SYML GKS 3.3V –40° to +125°C 8-Pin 2x2 MLF® Pb-Free
Notes
1. Other output voltage options available (0.72V to 3.3V), contact Micrel for details.
2. MLF® is a GREEN RoHS compliant package. Lead finish is NiPdAu. Mold compound is Halogen Free.
Pin Configuration
1SW
EN
NC
SNS
8 PGND
VIN
AGND
CFF
7
6
5
2
3
4
8-Pin 2mm x 2mm MLF® (ML)
(Top View)
Pin Description
Pin Number Pin Name Pin Name
1 SW Switch (Output): Internal power MOSFET output switches.
2 EN Enable (Input). Logic low will shut down the device, reducing the quiescent current to less than 4µA.
Do not leave floating.
3 NC No Connect.
4 SNS Connect to VOUT to sense output voltage.
5 CFF Feed Forward Capacitor. Connect a 560pF capacitor from V
OUT to CFF pin.
6 AGND Analog Ground.
7 VIN Supply Voltage (Input): Requires bypass capacitor to GND.
8 PGND Power Ground.

Produkt Specifikationer

Mærke: Microchip
Kategori: Ikke kategoriseret
Model: MIC23050

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