MIC23050
4MHz PWM Buck Regulator with
HyperLight Load™ Switching Scheme
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.
Features
∑
∑
∑
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∑
∑
∑
∑
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
_ 25mV
PP
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
∑
∑
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Applications
∑
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Cellular phones
Digital cameras
Portable media players
Wireless LAN cards
WiFi/WiMax/WiBro modules
USB Powered Devices
Datasheets and support documentation can be found on
Micrel’s web site at: www.micrel.com.
____________________________________________________________________________________________________________
Typical Application
HyperLight Load is a trademark of Micrel, Inc.
MLF and
MicroLeadFrame
are registered trademarks of Amkor Technology, Inc.
Protected by US Patent No. 7064531
M9999-111408-D
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (
408
) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
November 2008
1
Micrel, Inc.
MIC23050
Ordering Information
Part Number
MIC23050-4YML
MIC23050-GYML
MIC23050-SYML
Notes
1.
2.
Other output voltage options available (0.72V to 3.3V), contact Micrel for details.
MLF is a GREEN RoHS compliant package. Lead finish is NiPdAu. Mold compound is Halogen Free.
®
Marking
GK4
GKG
GKS
Nominal Output
(1)
Voltage
1.2V
1.8V
3.3V
Junction
Temp. Range
–40° to +125°C
–40° to +125°C
–40° to +125°C
Package
(2)
Lead Finish
®
®
®
8-Pin 2x2 MLF
8-Pin 2x2 MLF
8-Pin 2x2 MLF
Pb-Free
Pb-Free
Pb-Free
Pin Configuration
SW
EN
NC
SNS
1
2
3
4
8
7
6
5
PGND
VIN
AGND
CFF
8-Pin 2mm x 2mm MLF (ML)
(Top View)
®
Pin Description
Pin Number
1
2
3
4
5
6
7
8
Pin Name
SW
EN
NC
SNS
CFF
AGND
VIN
PGND
Pin Name
Switch (Output): Internal power MOSFET output switches.
Enable (Input). Logic low will shut down the device, reducing the quiescent
current to less than 4µA. Do not leave floating.
No Connect
Connect to V
OUT
to sense output voltage.
Feed Forward Capacitor. Connect a 560pF capacitor from V
OUT
to CFF pin.
Analog Ground.
Supply Voltage (Input): Requires bypass capacitor to GND.
Power Ground.
November 2008
2
M9999-111408-D
Micrel, Inc.
MIC23050
Absolute Maximum Ratings
(1)
Supply Voltage (V
IN
) ............................................................6V
Output Switch Voltage (V
SW
) ...............................................6V
Output Switch Current (I
SW
).................................................2A
Logic Input Voltage (V
EN
, V
LQ
)..............................V
IN
to –0.3V
Storage Temperature Range (T
s
) ............... –65°C to +150°C
(3)
ESD Rating .....................................................................3kV
Operating Ratings
(2)
Supply Voltage (V
IN
) ............................................2.7V to 5.5V
Logic Input Voltage (V
EN
).......................................... 0V to V
IN
Junction Temperature (T
J
).................... –40°C
≤
T
J
≤
+125°C
Thermal Resistance
2x2 MLF-8 (q
JA
) .................................................... 90°C/W
Electrical Characteristics
(4)
T
A
= 25°C with V
IN
= V
EN
= 3.6V; L = 1µH; C
FF
= 560pF; C
OUT
= 4.7µF; I
OUT
= 20mA unless otherwise specified.
Bold
values indicate –40°C< T
J
< +125°C.
Parameter
Supply Voltage Range
Under-Voltage Lockout Threshold
UVLO Hysteresis
Quiescent Current,
Hyper LL mode
Shutdown Current
Output Voltage Accuracy
Current Limit in PWM Mode
Output Voltage Line Regulation
Output Voltage Load Regulation
Maximum Duty Cycle
PWM Switch ON-Resistance
Frequency
Soft Start Time
Enable Threshold
Enable Hysteresis
Enable Input Current
Over-temperature Shutdown
Over-temperature Shutdown
Hysteresis
Notes:
1. Exceeding the absolute maximum rating may damage the device.
2. The device is not guaranteed to function outside its operating rating.
3. Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5k_ in series with 100pF.
4. Specification for packaged product only.
Condition
(turn-on)
I
OUT
= 0mA , V
SNS
> 1.2*V
OUT
nominal
V
IN
= 5.5V; V
EN
= 0V;
V
IN
= 3.0V, I
LOAD
= 20mA
SNS = 0.9*V
NOM
V
IN
= 3.0V to 5.5V, I
LOAD
= 20mA
20mA < I
LOAD
< 500mA,
SNS
£
V
NOM
I
SW
= 100mA PMOS
I
SW
= -100mA NMOS
I
LOAD
= 120mA
V
OUT
= 90%
(turn-on)
Min
2.7
2.45
Typ
2.55
100
20
0.01
Max
5.5
2.65
32
4
+2.5
1.7
Units
V
V
mV
µA
µA
%
A
%/V
%
%
Ω
Ω
MHz
µs
V
mV
µA
∞C
∞C
–2.5
0.65
1
0.5
0.3
80
89
0.45
0.5
4
650
0.5
0.8
35
0.1
165
20
3.4
4.6
1.2
2
November 2008
3
M9999-111408-D
微控制器 MCU
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