MIC23031
4MHz PWM 400mA Buck Regulator with
HyperLight Load™
General Description
The MIC23031 is a high-efficiency 4MHz 400mA
synchronous buck regulator with HyperLight Load™ mode.
HyperLight Load™ provides very-high efficiency at light
loads and ultra-fast transient response which is perfectly
suited for supplying processor core voltages. An additional
benefit of this proprietary architecture is very-low output
ripple voltage throughout the entire load range with the use
of small output capacitors. The tiny 1.6mm x 1.6mm Thin
MLF
®
package saves precious board space and requires
only three external components.
The MIC23031 is designed for use with a very-small
inductor, down to 0.47µH, and an output capacitor as small
as 2.2µF that enables a sub-1mm height.
The MIC23031 has a very-low quiescent current of 21µA
and achieves as high as 88% efficiency at 1mA. At higher
loads, the MIC23031 provides a constant switching
frequency around 4MHz while achieving peak efficiencies
up to 93%.
The MIC23031 is available in a 6-pin 1.6mm x 1.6mm Thin
MLF
®
package with an operating junction temperature
range from –40°C to +125°C.
Data sheets and support documentation can be found on
Micrel’s web site at:
www.micrel.com.
Features
•
•
•
•
•
•
•
Input voltage: 2.7V to 5.5V
400mA output current
Up to 93% efficiency and 88% at 1mA
21µA typical quiescent current
4MHz PWM operation in continuous mode
Ultra-fast transient response
Low voltage output ripple
– 20mVpp ripple in HyperLight Load™ mode
– 3mV output voltage ripple in full PWM mode
0.01µA shutdown current
Fixed and adjustable output voltage options available
6-pin 1.6mm x 1.6mm Thin MLF
®
–40°C to +125°C junction temperature range
Mobile handsets
Portable media/MP3 players
Portable navigation devices (GPS)
WiFi/WiMax/WiBro modules
Digital Cameras
Wireless LAN cards
USB-powered devices
Portable applications
•
•
•
•
•
•
•
•
•
•
•
•
Applications
Typical Application
HyperLight Load is a trademark of Micrel, Inc
MLF and
MicroLead
Frame 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
October 2010
M9999-102210-A
Micrel Inc.
MIC23031
Ordering Information
Part Number
MIC23031-AYMT
MIC23031-GYMT
MIC23031-FYMT
MIC23031-4YMT
MIC23031-CYMT
Notes:
1.
2.
Other options available. Contact Micrel for details.
Thin MLF is GREEN RoHS-compliant package. Lead finish is NiPdAu. Mold compound is Halogen Free.
®
Marking
Code
GEA
GEG
GEF
GE4
GEC
Nominal
Output Voltage
Adjustable
1.8V
1.5V
1.2V
1.0V
Junction
Temperature Range
−40°C
to
+125°C
−40°C
to
+125°C
−40°C
to
+125°C
−40°C
to
+125°C
−40°C
to
+125°C
Package
6-Pin 1.6mm
×
1.6mm Thin MLF
®
6-Pin 1.6mm
×
1.6mm Thin MLF
®
6-Pin 1.6mm
×
1.6mm Thin MLF
®
6-Pin 1.6mm
×
1.6mm Thin MLF
®
Lead Finish
Pb-Free
Pb-Free
Pb-Free
Pb-Free
Pb-Free
6-Pin 1.6mm
×
1.6mm Thin MLF
®
Pin Configuration
VIN
SW
SNS
1
2
3
6
5
4
PGND
AGND
EN
VIN
SW
SNS
1
2
3
6
5
4
GND
FB
EN
6-Pin 1.6 x 1.6mm Thin MLF
®
(MT)
Fixed (Top View)
6-Pin 1.6 x 1.6mm Thin MLF
®
(MT)
Adjustable (Top View)
Pin Description
Fixed
Option
1
2
3
4
5
−
6
−
ePad
Adjustable
Option
1
2
3
4
−
5
−
6
ePad
Pin Name
VIN
SW
SNS
EN
AGND
FB
PGND
GND
HS PAD
Pin Function
Input Voltage: Connect a capacitor to ground to decouple the noise.
Switch (Output): Internal power MOSFET output switches.
Sense: Connect to V
OUT
as close to output capacitor as possible to sense output
voltage.
Enable (Input): Logic high enables operation of the regulator. Logic low will shut down
the device. Do not leave floating.
Analog Ground: Connect to central ground point where all high current paths meet
(C
IN
, C
OUT
, PGND) for best operation.
Feedback (Input): Connect resistor divider at this node to set output voltage. Resistors
should be selected based on a nominal V
FB
of 0.62V.
Power Ground.
Ground.
Connect to PGND or GND.
October 2010
2
M9999-102210-A
Micrel, Inc.
MIC23031
Absolute Maximum Ratings
(1)
Supply Voltage (V
IN
) . ……………………………………….6V
Sense (V
SNS
).. ..................................................................6V
Output Switch Voltage ..................................................6V
Enable Input Voltage (V
EN
)................................−0.3V to V
IN
Storage Temperature Range ..……………−65°C to +150°C
ESD Rating
(3)
................................................. ESD Sensitive
Operating Ratings
(2)
Supply Voltage (V
IN
)... …………………………..2.7V to 5.5V
Enable Input Voltage (V
EN
) .. ……………………….0V to V
IN
Output Voltage Range (V
SNS
) ………………….0.7V to 3.6V
Junction Temperature Range (T
J
).. ….−40°C
≤
T
J
≤
+125°C
Thermal Resistance
1.6 x 1.6mm Thin MLF
®
-6 (θ
JA
).......................92.4°C/W
Electrical Characteristics
(4)
T
A
= 25°C; V
IN
= V
EN
= 3.6V; L = 1µH; C
OUT
= 4.7µF unless otherwise specified.
Bold
values indicate –40°C
≤
T
J
≤
+125°C, unless noted.
Parameter
Supply Voltage Range
Under-Voltage Lockout Threshold
Quiescent Current
Shutdown Current
Output Voltage Accuracy
Feedback Voltage
Current Limit
Output Voltage Line Regulation
Output Voltage Load Regulation
PWM Switch ON-Resistance
Frequency
Soft-Start Time
Enable Threshold
Enable Input Current
Over-Temperature Shutdown
Over-Temperature Shutdown Hysteresis
Notes:
1.
2.
3.
4.
Exceeding the absolute maximum rating may damage the device.
The device is not guaranteed to function outside its operating rating.
Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5kΩ in series with 100pF.
Specification for packaged product only.
Condition
(Turn-on)
I
OUT
= 0mA , SNS
>
1.2 * V
OUT
Nominal
V
EN
= 0V, V
IN
= 5.5V
V
IN
= 3.6V; I
LOAD
= 20mA
Adjustable Option Only
SNS = 0.9*V
OUTNOM
V
IN
= 3.0V to 5.5V, V
OUT
= 1.2V, I
LOAD
= 20mA,
20mA
<
I
LOAD
<
400mA, V
OUT
= 1.2V,
V
IN
= 3.6V
I
SW
= 100mA PMOS
I
SW
=
−100mA
NMOS
I
OUT
= 120mA
V
OUT
= 90%
Min.
2.7
2.45
Typ.
2.55
21
0.01
Max.
5.5
2.65
35
4
+2.5
Units
V
V
µA
µA
%
V
−2.5
0.62
0.41
0.7
0.3
0.7
0.65
0.8
4
100
0.5
0.9
0.1
160
20
1
A
%/V
%
Ω
MHz
µs
1.2
2
V
µA
°C
°C
October 2010
3
M9999-102210-A
模拟电子
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