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
•
20µA typical quiescent current
components and low output ripple at all loads.
•
4MHz in PWM in constant-current mode
The MIC23050 also has a very-low typical quiescent
current draw of 20µA and can achieve over 89% efficiency
•
0.47µH to 2.2µH inductor
even at 1mA. The device allows operation with a tiny
•
Low voltage output ripple
inductor ranging from 0.47µH to 2.2µH and uses a small
−
25mV
PP
in HyperLight Load™ mode
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
•
~89% at 1mA
speed to obtain low standby currents and in doing so the
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 +125°C.
•
WiFi/WiMax/WiBro modules
Datasheets and support documentation can be found on
•
USB-powered devices
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
M9999-092211-E
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (
408
) 944-0800 • fax + 1 (408) 474-1000 •
http://www.micrel.com
September 2011
1
Micrel, Inc.
MIC23050
Ordering Information
Part Number
MIC23050-CYML
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
GKC
GK4
GKG
GKS
Nominal Output
(1)
Voltage
1.0V
1.2V
1.8V
3.3V
Junction Temperature Range
–40° to +125°C
–40° to +125°C
–40° to +125°C
–40° to +125°C
Package
(2)
8-Pin 2x2 MLF
®
8-Pin 2x2 MLF
®
Lead Finish
Pb-Free
Pb-Free
Pb-Free
Pb-Free
8-Pin 2x2 MLF
®
8-Pin 2x2 MLF
®
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.
September 2011
2
M9999-092211-E
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
Junction Temperature (T
J
) .......................................
+150°C
Storage Temperature Range (T
s
)..............–65°C to +150°C
ESD Rating
(3)
.................................................................. 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
2mm x 2mm MLF-8 (θ
JA
) ...................................90°C/W
2mm x 2mm MLF-8 (θ
JC
) ...................................45°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
Undervoltage 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
(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)
Condition
Min.
2.7
2.45
2.55
100
20
0.01
1
0.5
0.3
89
0.45
0.5
4
650
0.8
35
0.1
165
20
4.6
1.2
2
Typ.
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
80
3.4
0.5
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, 1.5kΩ in series with 100pF.
4. Specification for packaged product only.
September 2011
3
M9999-092211-E
嵌入式系统
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