MIC23050
4MHz PWM Buck Regulator with
HyperLight Load Switching Scheme
General Description Features
The Micrel MIC23050 is a high-efficiency, 600mA, PWM,
Input voltage: 2.7V to 5.5V HyperLight Load
synchronous buck (step-down) regulator featuring the
600mA output current
HyperLight Load patented switching scheme that offers
Fixed output voltage from 0.72V to 3.3V
best-in-class light load efficiency and transient
Ultra-fast transient response
performance while providing very-small external
components and low output ripple at all loads. 20A typical quiescent current
The MIC23050 also has a very-low typical quiescent 4MHz in PWM in constant-current mode
current draw of 20A and can achieve over 89% efficiency
0.47H to 2.2H inductor
even at 1mA. The device allows operation with a tiny
Low voltage output ripple
inductor ranging from 0.47H to 2.2H and uses a small
25mV in HyperLight Load mode
PP
output capacitor that enables a sub-1mm height.
3mV output voltage ripple in full PWM mode
In contrast to traditional light load schemes, the HyperLight
>93% efficiency
Load architecture does not need to trade off control
speed to obtain low standby currents and in doing so the ~89% at 1mA
device only needs a small output capacitor to absorb the
Micropower shutdown
load transient as the powered device goes from light load
Available in 8-pin 2mm x 2mm MLF
to full load.
40 C to +125 C junction temperature range
At higher loads the MIC23050 provides a constant
Applications
switching frequency of greater than 4MHz while providing
peak efficiencies greater than 93%.
Cellular phones
The MIC23050 comes in fixed output voltage options from
Digital cameras
0.72V to 3.3V eliminating external feedback components.
Portable media players
The MIC23050 is available in an 8-pin 2mm x 2mm MLF
Wireless LAN cards
with a junction operating range from 40 C to +125C.
WiFi/WiMax/WiBro modules
Datasheets and support documentation can be found on
Micrels web site at: www.micrel.com. USB-powered devices
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Typical Application
HyperLight Load is a trademark of Micrel, Inc.
Protected by US Patent No. 7064531
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 Micrel, Inc. MIC23050
Ordering Information
Nominal Output
(2)
Part Number Marking Junction Temperature Range Package Lead Finish
(1)
Voltage
MIC23050-CYML GKC 1.0V 40 to +125C 8-Pin 2x2 MLF Pb-Free
MIC23050-4YML GK4 1.2V 40 to +125C 8-Pin 2x2 MLF Pb-Free
MIC23050-GYML GKG 1.8V 40 to +125C 8-Pin 2x2 MLF Pb-Free
MIC23050-SYML GKS 3.3V 40 to +125C 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
SW 1 8 PGND
EN 2 7 VIN
NC 3 6 AGND
SNS 4 5 CFF
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.
Enable (Input). Logic low will shut down the device, reducing the quiescent current to less than 4A.
2 EN
Do not leave floating.
3 NC No Connect.
4 SNS Connect to V to sense output voltage.
OUT
5 CFF Feed Forward Capacitor. Connect a 560pF capacitor from V to CFF pin.
OUT
6 AGND Analog Ground.
7 VIN Supply Voltage (Input): Requires bypass capacitor to GND.
8 PGND Power Ground.
M9999-092211-E
September 2011 2