MIC23303
4MHz PWM 3A Buck Regulator with
HyperLight Load and Power Good
General Description Features
The MIC23303 is a high-efficiency 4MHz 3A synchronous Input voltage: 2.7V to 5.5V
buck regulator with HyperLight Load mode, Power Good
Output voltage: down to 0.65
output indicator, and programmable soft-start. HyperLight
Up to 3A output current
Load provides very high efficiency at light loads and ultra-
Up to 93% peak efficiency
fast transient response, which makes the MIC23303
perfectly suited for supplying processor core voltages. An 80% typical efficiency at 1mA
additional benefit of this proprietary architecture is very low
Power Good output
output ripple voltage throughout the entire load range with
Programmable soft-start
the use of small output capacitors. The tiny 3mm 3mm
24A typical quiescent current
DFN package saves precious board space and requires
4MHz PWM operation in continuous mode
only six external components.
Ultra-fast transient response
The MIC23303 is designed for use with a very small
Low ripple output voltage
inductor, down to 0.33H, and an output capacitor as small
as 10F that enables a total solution size less than 1mm in
35mVpp ripple in HyperLight Load mode
height.
5mV output voltage ripple in full PWM mode
The MIC23303 has very low quiescent current of 24A and
Fully-integrated MOSFET switches
can achieve peak efficiency of 93% in continuous
0.01A shutdown current
conduction mode. In discontinuous conduction mode, the
Thermal-shutdown and current-limit protection
MIC23303 can achieve 80% efficiency at 1mA.
12-pin 3mm 3mm DFN
The MIC23303 is available in a 12-pin 3mm 3mm DFN
40C to +125C junction temperature range
package with an operating junction temperature range
from 40C to +125C.
Applications
Datasheets and support documentation are available on
Portable media/MP3 players
Micrels web site at: www.micrel.com.
Portable navigation devices (GPS)
WiFi/WiMax/WiBro modules
Digital Cameras
Wireless LAN cards
Portable applications
Typical Application
HyperLight Load is a trademark of Micrel, Inc.
Micrel Inc. 2180 Fortune Drive San Jose, CA 95131 USA tel +1 (408) 944-0800 fax + 1 (408) 474-1000 Micrel, Inc. MIC23303
Ordering Information
Marking Nominal Output Junction
Part Number Package
Code Voltage Temperature Range
(1, 2)
MIC23303YML WYA Adjustable 40C to +125C 12-Pin 3mm 3mm DFN
Notes:
1. DFN is a GREEN RoHS compliant package. Lead finish is NiPdAu. Mold compound is Halogen Free.
2. DFN Pin 1 identifier is .
Pin Configuration
3mm x 3mm DFN (ML)
(Top View)
Pin Description
Pin Number
Pin Name Pin Function
(Adjustable)
1, 2 SW Switch (Output): Internal power MOSFET output switches.
Power Good: Open-drain output for the power good indicator. Use a pull-up resistor from
3 PG
this pin to a voltage source to detect a power good condition.
Enable (Input): Logic high enables operation of the regulator. Logic low shuts down the
4 EN
device. Do not leave floating.
5 SNS Sense: Connect to V as close to output capacitor as possible to sense output voltage.
OUT
6 FB Feedback: Connect a resistor divider from the output to ground to set the output voltage.
Soft Start: Place a capacitor from this pin to ground to program the soft start time. Do not
7 SS
leave floating, 2.2nF minimum C is required.
SS
Analog Ground: Connect to central ground point where all high current paths meet (C ,
IN
8 AGND
C , and PGND) for best operation.
OUT
9 AVIN Supply Voltage (Power Input): Analog control circuitry. Connect to PVIN.
10, 11 PVIN Input Voltage: Connect a capacitor to ground to decouple the noise.
12 PGND Power Ground.
EP ePad Thermal pad: Connect to Ground plane for improved heat sinking.
090613-2.0
September 6, 2013 2